CN116161906A - High-strength high-toughness fiber concrete based on geopolymer artificial aggregate and preparation method thereof - Google Patents
High-strength high-toughness fiber concrete based on geopolymer artificial aggregate and preparation method thereof Download PDFInfo
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- 229920000876 geopolymer Polymers 0.000 title claims abstract description 111
- 239000000835 fiber Substances 0.000 title claims abstract description 82
- 239000004567 concrete Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 64
- 239000004568 cement Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 239000002440 industrial waste Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000009736 wetting Methods 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims description 38
- 239000000843 powder Substances 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 20
- 239000010881 fly ash Substances 0.000 claims description 18
- 239000003513 alkali Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- -1 polyethylene Polymers 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000010791 domestic waste Substances 0.000 claims description 3
- 239000011210 fiber-reinforced concrete Substances 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 235000019795 sodium metasilicate Nutrition 0.000 description 4
- 229910052911 sodium silicate Inorganic materials 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
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- 239000002956 ash Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011182 bendable concrete Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength high-toughness fiber concrete based on geopolymer artificial aggregate and a preparation method thereof, wherein the preparation method comprises the following steps: preparing geopolymer artificial aggregate; pre-wetting the geopolymer artificial aggregate to reach saturation and dryness; mixing cement, silica fume and saturated dry geopolymer artificial aggregate, and stirring; adding water and a water reducing agent, and stirring to obtain slurry; adding chopped fibers and stirring; the materials are put into use after primary curing and soaking curing. The high-strength high-toughness fiber concrete based on the geopolymer artificial aggregate has compressive strength not less than 100MPa and ultimate tensile strain not less than 1%. The invention synthesizes geopolymer artificial aggregate by using industrial waste, and adjusts and controls the micromechanics property of the fiber concrete material based on the geopolymer artificial aggregate, thereby preparing the high-strength high-toughness fiber concrete material and providing a new technical path for the high-valued utilization of the industrial waste and the performance optimization of cement-based materials.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-strength and high-toughness fiber concrete based on geopolymer artificial aggregate and a preparation method thereof.
Background
As an emerging technology in the field of solid waste recovery, the preparation of artificial aggregate is beneficial to alleviating environmental problems caused by accumulation of a large amount of industrial waste. Meanwhile, the artificial aggregate can help to relieve the pressure of the natural aggregate resource exploitation in consideration of the fact that the natural aggregate is not used. Currently, the two main types of artificial aggregates (calcined aggregates and cold-bonded aggregates) existing on the market have greater market value and wider application range. As a branch of the cold-consolidated aggregate, the geopolymer artificial aggregate can be prepared by exciting silicon-aluminum phase industrial byproducts under an aqueous environment by alkali and adopting a crushing mode. Although the geopolymer artificial aggregate has the characteristics of low energy consumption, low carbon dioxide emission and excellent heavy metal solidification, the mechanical property of the geopolymer artificial aggregate still cannot reach the strength level of the natural aggregate formed through long-term geological action, so that the artificial aggregate is still an inferior substitute of the natural aggregate at present, and the concrete prepared from the geopolymer artificial aggregate still has potential safety hazards.
The fiber reinforced cement-based composite material (Engineered Cementitious Composites, hereinafter referred to as ECC) is a novel building material with high ductility and steady-state multi-joint cracking and strain hardening characteristics. Along with the continuous progress of ECC design technology, how to finely regulate the mechanical properties of ECC, so that the ECC gradually advances towards the directions of higher ductility and higher strength is the leading-edge research field of ECC material design. In addition, the development of the technology for efficiently recycling and treating the solid wastes is gradually a big subject of the current era. Therefore, how to realize the high-performance utilization of the waste in an economic and sustainable way is a large technical barrier for sustainable development in the current age.
Disclosure of Invention
The invention has the technical characteristics of providing the high-strength and high-toughness fiber concrete based on the geopolymer artificial aggregate and the preparation method thereof, thereby realizing the high-valued application of the artificial aggregate and the performance optimization of the fiber reinforced cement-based material.
The technical scheme of the invention is as follows:
a high strength, high toughness fiber concrete based on geopolymer artificial aggregate, wherein the concrete comprises: cement matrix, chopped fibers and geopolymer artificial aggregate;
the cement matrix is prepared from the following components: cement, silica fume, a water reducing agent and water;
the geopolymer artificial aggregate is prepared from the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
the micro-hardness of the geopolymer artificial aggregate is smaller than or equal to that of the cement matrix/geopolymer artificial aggregate interface, and the micro-hardness of the geopolymer artificial aggregate is smaller than that of the cement matrix.
Optionally, the first cementitious material further includes: industrial waste or household waste.
Optionally, in the geopolymer artificial aggregate, the alkali-activator accounts for 8-16% of the mass of the first cementing material, and the water accounts for 20-45% of the mass of the first cementing material.
Optionally, the concrete is prepared from the following components: cement, silica fume, water reducer, water, chopped fiber and geopolymer artificial aggregate.
Optionally, the chopped fibers include one or more of polyethylene fibers, polyvinyl alcohol fibers, polypropylene fibers, and basalt fibers.
Optionally, the length of the chopped fibers is 6-18mm, and the chopped fibers account for 1.5-2.0% of the volume of the concrete.
Optionally, the diameter of the geopolymer artificial aggregate is less than or equal to 4.75mm.
Alternatively, the compressive strength of the concrete is not less than 100MPa, and the ultimate tensile strain of the concrete is not less than 1%.
The preparation method of the high-strength high-toughness fiber concrete based on the geopolymer artificial aggregate comprises the following steps:
providing a geopolymer artificial aggregate, wherein the geopolymer artificial aggregate comprises the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
pre-wetting the geopolymer artificial aggregate until reaching a saturated surface dry state;
mixing cement, silica fume and geopolymer artificial aggregate in a saturated surface dry state, and stirring to obtain a first mixture;
adding water and a water reducing agent into the first mixture, and stirring to obtain slurry;
adding chopped fibers into the slurry, and stirring to obtain a second mixture;
and carrying out primary curing and soaking curing on the second mixture in sequence to obtain the concrete.
Optionally, the preparation method of the geopolymer artificial aggregate comprises the following steps: mixing fly ash, granulated blast furnace slag powder and alkali excitant in an aqueous solution environment to form slurry; and after the slurry is primarily solidified, crushing the slurry to a required size by adopting a crushing device, and curing to obtain the geopolymer artificial aggregate.
The beneficial effects are that: the invention utilizes the characteristic of relatively low strength and fracture toughness of the geopolymer artificial aggregate, adds the geopolymer artificial aggregate into a high-strength fiber cement matrix, and changes the overall fracture toughness of the fiber cement matrix, thereby realizing fine regulation and control of the mechanical properties of the matrix; meanwhile, as more than 20% of granulated blast furnace slag powder is doped in the geopolymer artificial aggregate, the microhardness of the interface between the geopolymer artificial aggregate and the cement matrix can be regulated and controlled, the microhardness of the interface between the aggregate and the matrix is ensured to be greater than that of the aggregate, cracks are prevented from developing along the interface between the aggregate and the matrix, so that the cracks are induced to develop at the artificial aggregate, the phenomenon of saturated multi-crack cracking of the artificial aggregate fiber concrete is promoted, and further, the high-strength and high-toughness are realized based on the weak aggregate.
Drawings
FIG. 1 is a plot of tensile stress versus tensile strain for a high strength, high toughness fiber concrete based on geopolymer artificial aggregate in an embodiment of the present invention.
FIG. 2 is a graph of microhardness profiles of high strength and high toughness fiber concrete aggregates, interfaces and matrices based on geopolymer artificial aggregates in an embodiment of the invention.
Detailed Description
The invention provides a high-strength high-toughness fiber concrete based on geopolymer artificial aggregate and a preparation method thereof, and the invention is further described in detail in the following in order to more clearly and clearly express the purposes and effects of the invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides high-strength and high-toughness fiber concrete based on geopolymer artificial aggregate, wherein the concrete comprises the following components: cement matrix, chopped fibers and geopolymer artificial aggregate;
the cement matrix is prepared from the following components: cement, silica fume, a water reducing agent and water;
the geopolymer artificial aggregate is prepared from the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
the micro-hardness of the geopolymer artificial aggregate is smaller than or equal to that of the cement matrix/geopolymer artificial aggregate interface, and the micro-hardness of the geopolymer artificial aggregate is smaller than that of the cement matrix.
In the embodiment, the characteristics of relatively low strength and fracture toughness of the geopolymer artificial aggregate are utilized, and the geopolymer artificial aggregate is added into a high-strength fiber reinforced cement matrix to change the overall fracture toughness of the fiber reinforced cement matrix, so that the fine regulation and control of the mechanical properties of the matrix are realized; meanwhile, the microhardness of the geopolymer artificial aggregate-cement matrix interface is regulated and controlled by doping more than 20% of granulated blast furnace slag powder in the preparation of the geopolymer artificial aggregate, so that the microhardness is more than or equal to that of the geopolymer artificial aggregate, cracks are prevented from developing along the aggregate-matrix interface, the cracks are induced to develop at the artificial aggregate, the phenomenon of saturated multi-crack cracking of the artificial aggregate fiber concrete is promoted, and further, the high-strength and high-toughness are realized based on the weak aggregate.
In the embodiment, the micro mechanical property of the fiber concrete material is regulated and controlled by using the geopolymer artificial aggregate, so that the fiber concrete material with high strength and high toughness is prepared. In the embodiment, the high-strength high-toughness fiber concrete based on the geopolymer artificial aggregate has compressive strength not less than 100MPa and ultimate tensile strain not less than 1%.
Compared with the existing fiber concrete, the fiber concrete of the embodiment has the following technical advantages:
1. the fiber concrete of the embodiment has the characteristics of high strength and high toughness.
2. The embodiment adopts geopolymer artificial aggregate, and can realize microscopic regulation and control of cement matrix and interface strength, thereby obtaining stronger and manually controllable ductility and strain hardening characteristics.
3. While natural aggregate is rare in the prior art, the green characteristic and the sustainability of the material can be improved by adopting the artificial aggregate based on waste materials in the embodiment.
In one embodiment, the cementitious matrix is prepared from cement, silica fume, a water reducing agent, and water.
In one embodiment, the chopped fibers include one or more of Polyethylene (PE) fibers, polyvinyl alcohol (PVA) fibers, polypropylene (PP) fibers, and basalt fibers. Further, the chopped fibers are polypropylene fibers.
In one embodiment, the length of the chopped fibers is 6-18mm, the chopped fibers account for 1.5-2.0% of the concrete volume, and the fiber length and the fiber doping amount can form enough fiber-matrix bridging force while meeting the flowability requirement, so that better strain hardening performance is obtained.
In one embodiment, the concrete is prepared from the following components: cement, silica fume, water reducer, water, chopped fiber and geopolymer artificial aggregate.
In this embodiment, the cement matrix is prepared from the following components: cement, silica fume, a water reducing agent and water. Further, the cement and the silica fume are used as a second cementing material, the cement accounts for 80-100% of the mass of the second cementing material, the silica fume accounts for 0-20% of the mass of the second cementing material, the water accounts for 16-22% of the mass of the second cementing material, and the water reducer accounts for 1.0-1.5% of the mass of the second cementing material.
In this embodiment, the geopolymer artificial aggregate is saturated and dry geopolymer artificial aggregate. Further, the saturated and dry geopolymer artificial aggregate accounts for 20-50% of the mass of the second cementing material. According to the doping amount of the different polymerization artificial aggregate, the fracture toughness of the fiber cement matrix can be regulated and controlled. Within this range, the strain hardening properties required for engineering can be effectively obtained.
In this embodiment, the geopolymer artificial aggregate is prepared from the following components: the gel comprises a first gel material, an alkali-activator and water. In one embodiment, the alkali-activator comprises 8-16% by mass of the first cementitious material and the water comprises 20-45% by mass of the first cementitious material.
In one embodiment, the first binder may further include: industrial waste or household waste. By using geopolymer artificial aggregate prepared from industrial waste, high-value utilization of industrial waste and performance optimization of fiber reinforced cement-based materials are achieved.
That is, the geopolymer artificial aggregate is prepared by taking fly ash (as a main cementing material) and granulated blast furnace slag powder (as a secondary cementing material, the mixing amount is not less than 20% of the total mass of the first cementing material) as raw materials, adding or not adding other industrial waste or household garbage (as a supplementary cementing material), and crushing after being excited by an alkali-exciting agent. The microhardness of the composite material is less than or equal to that of the cement matrix/geopolymer artificial aggregate interface and less than that of the cement matrix.
In one embodiment, the geopolymer artificial aggregate is a crushed fine aggregate having a diameter of 4.75mm or less.
In one embodiment, the industrial waste is red mud.
In one embodiment, the household garbage is municipal household garbage incineration ash.
In one embodiment, the alkali-activator is technical grade sodium metasilicate or a mixture of sodium metasilicate and water glass.
In the embodiment, the strength of the geopolymer artificial aggregate is weaker than that of the cement matrix, and meanwhile, the geopolymer artificial aggregate has strong cementing performance with the cement matrix, so that cracks are prevented from developing along an aggregate-matrix interface, the cracks are induced to develop at the artificial aggregate, the phenomenon of saturated multi-seam cracking of the artificial aggregate fiber concrete is promoted, and high strength and high toughness are further realized.
In addition to this, the present embodiment has the following advantages:
1. the embodiment prepares the geopolymer artificial aggregate based on the silicon-aluminum phase industrial byproducts and the waste materials, is environment-friendly, and can help solve the problem of accumulation of the industrial byproducts and the waste materials.
2. The embodiment utilizes the low-strength characteristic of the geopolymer artificial aggregate to regulate and control the performance of the fiber reinforced cement matrix, thereby promoting the saturated multi-seam cracking of the geopolymer artificial aggregate, and realizing the high-value utilization of industrial byproducts/waste materials and the performance optimization of the fiber reinforced cement matrix material.
3. The embodiment provides a brand new application method of the geopolymer artificial aggregate, provides new possibility for replacing natural aggregate, and solves the problem of aggregate shortage to a certain extent.
The embodiment of the invention provides a preparation method of high-strength and high-toughness fiber concrete based on geopolymer artificial aggregate, which comprises the following steps:
s10, providing geopolymer artificial aggregate, wherein the geopolymer artificial aggregate is prepared from the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
s20, prewetting the geopolymer artificial aggregate until reaching a saturated surface dry state;
s30, mixing cement, silica fume and geopolymer artificial aggregate in a saturated surface dry state, and stirring (5-10 minutes) to obtain a first mixture;
s40, adding water and a water reducing agent into the first mixture, and stirring (about 15 minutes) to obtain uniform slurry;
s50, adding chopped fibers into the slurry, and stirring (about 5 minutes) to obtain a second mixture;
and S60, carrying out primary curing and soaking curing on the second mixture in sequence to obtain the concrete.
In step S10, in one embodiment, the method for preparing the geopolymer artificial aggregate includes the steps of: mixing fly ash, granulated blast furnace slag powder and alkali excitant in an aqueous solution environment to form slurry; and after the slurry is primarily solidified, crushing the slurry to a required size by adopting a crushing device, and curing to obtain the geopolymer artificial aggregate.
In one embodiment, the geopolymer artificial aggregate is cured at ambient temperature for 28 days or more after crushing.
In step S60, the primary curing is aimed at obtaining hardened concrete, facilitating the removal of the form; the purpose of submerged curing is to allow the concrete to fully complete the early hydration process.
Further, after the step of soaking curing, the method further comprises the step of steam curing and temperature curing in sequence, so that the concrete with stable performance is obtained. The aim of further steam curing and temperature curing is to enable the concrete to obtain higher mechanical properties and improve the stability of the mechanical properties of the concrete.
In one embodiment, the preliminary curing temperature ranges from 21 to 25 ℃ and the curing time ranges from 24 to 48 hours.
In one embodiment, the submerged maintenance time is 27 days.
In one embodiment, the steam curing humidity is 95% -100%, the curing temperature is in the range of 60 ℃ -90 ℃ and the curing time is 5 days.
In one embodiment, the temperature range of the temperature curing is 60 ℃ to 90 ℃ and the temperature curing time is 7 days.
The invention is further illustrated by the following specific examples.
Examples:
in the specific embodiment, the geopolymer artificial aggregate is prepared from the following raw materials in parts by weight:
(1) Raw materials: the geopolymer artificial aggregate takes fly ash as a main cementing material and accounts for 80% of the mass of the first cementing material, and granulated blast furnace slag powder as a secondary cementing material and accounts for 20% of the mass of the first cementing material; the alkali-activated agent adopts industrial sodium metasilicate, the modulus (the mole ratio of silicon dioxide to sodium oxide in the alkali-activated agent) is 0.94, and the alkali-activated agent accounts for 12% of the mass ratio of the first cementing material; the water accounts for 35% of the mass of the first cementing material.
(2) The preparation method comprises the following steps: firstly, uniformly stirring fly ash, granulated blast furnace slag powder and industrial sodium metasilicate, and then adding water to obtain slurry; pouring the slurry into a mould, curing for 24 hours at room temperature, taking out the slurry after hardening, crushing the slurry to below 4.75mm by a crusher, and curing for 28 days at room temperature. The water absorption and apparent density of the obtained geopolymer artificial aggregate are 24.6 percent and 2050kg/m respectively 3 。
In the specific embodiment, the raw materials and the preparation method of the high-strength high-toughness fiber concrete based on the geopolymer artificial aggregate are as follows:
(1) And pre-wetting the prepared geopolymer artificial aggregate to reach saturation and dryness.
(2) Raw materials: taking cement and silica fume as a second cementing material, wherein the mass of the cement and the silica fume accounts for 80 percent and 20 percent of the specific gravity of the second cementing material respectively, and the mass of the saturated and dry geopolymer artificial aggregate accounts for 48 percent of the mass of the second cementing material; the mass of the added water accounts for 17.1% of the mass of the second cementing material; the mass of the added water reducer (solid) accounts for 1.32% of the mass of the second cementing material. The chopped fibers were Polyethylene (PE) fibers and the volume was 2% of the total volume of the concrete.
(3) The preparation method comprises the following steps: firstly, prewetting geopolymer artificial aggregate to reach saturation and dryness; mixing cement, silica fume and saturated and dry geopolymer artificial aggregate, and stirring for 8 minutes; adding water and a water reducing agent, and stirring for 15 minutes to obtain uniform slurry; adding chopped fibers and stirring for 5 minutes; the stirred slurry was poured into compression and stretching molds, cured at room temperature for 24 hours, taken out after hardening, and further cured for testing on day 28.
In this embodiment, the high-strength and high-toughness fiber concrete based on the geopolymer artificial aggregate has the following test performances:
compressive strength: 121MPa.
Tensile strength: 10.1MPa.
Ultimate tensile strain: 9.9%.
Average crack width at limit state: 60 μm.
In this particular example, a tensile stress-strain curve of a high strength, high toughness fiber concrete based on geopolymer artificial aggregate is shown in fig. 1.
In this embodiment, the high-strength and high-toughness fiber concrete aggregate, interface and matrix microhardness distribution curve based on the geopolymer artificial aggregate is shown in fig. 2. As can be seen from the figure, the microhardness of the geopolymer artificial aggregate in the specific embodiment is less than or equal to the microhardness of the cement matrix/geopolymer artificial aggregate interface and less than the microhardness of the cement matrix.
Claims (10)
1. A high strength, high toughness fiber concrete based on geopolymer artificial aggregate, the concrete comprising: cement matrix, chopped fibers and geopolymer artificial aggregate;
the cement matrix is prepared from the following components: cement, silica fume, a water reducing agent and water;
the geopolymer artificial aggregate is prepared from the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
the micro-hardness of the geopolymer artificial aggregate is smaller than or equal to that of the cement matrix/geopolymer artificial aggregate interface, and the micro-hardness of the geopolymer artificial aggregate is smaller than that of the cement matrix.
2. The geopolymer-artificial-aggregate-based high-strength and high-toughness fiber concrete according to claim 1, wherein the first cementitious material further comprises: industrial waste or household waste.
3. The high-strength high-toughness fiber concrete based on geopolymer artificial aggregate according to claim 1, wherein in the geopolymer artificial aggregate, the alkali-activator accounts for 8-16% of the mass of the first cementing material, and the water accounts for 20-45% of the mass of the first cementing material.
4. The high strength high toughness fiber concrete based on geopolymer artificial aggregate according to claim 1, wherein the concrete is prepared from the following components: cement, silica fume, water reducer, water, chopped fiber and geopolymer artificial aggregate.
5. The high-strength high-toughness fiber concrete based on geopolymer artificial aggregate according to claim 1, wherein the chopped fibers comprise one or more of polyethylene fibers, polyvinyl alcohol fibers, polypropylene fibers and basalt fibers.
6. The high strength, high toughness fiber reinforced concrete based on geopolymer artificial aggregate according to claim 1, wherein the chopped fibers have a length of 6-18mm and the chopped fibers account for 1.5-2.0% of the volume of the concrete.
7. The high strength, high toughness fiber concrete based on geopolymer artificial aggregate according to claim 1, wherein the diameter of the geopolymer artificial aggregate is 4.75mm or less.
8. The high-strength high-toughness fiber concrete based on geopolymer artificial aggregate according to claim 1, wherein the compressive strength of the concrete is not less than 100MPa and the ultimate tensile strain of the concrete is not less than 1%.
9. A method for preparing the high-strength and high-toughness fiber concrete based on the geopolymer artificial aggregate according to any one of claims 1 to 8, comprising the steps of:
providing a geopolymer artificial aggregate, wherein the geopolymer artificial aggregate comprises the following components: the cement comprises a first cementing material, an alkali excitant and water, wherein the first cementing material comprises fly ash and granulated blast furnace slag powder, the fly ash accounts for 50-80% of the mass of the first cementing material, and the granulated blast furnace slag powder accounts for 20-50% of the mass of the first cementing material;
pre-wetting the geopolymer artificial aggregate until reaching a saturated surface dry state;
mixing cement, silica fume and geopolymer artificial aggregate in a saturated surface dry state, and stirring to obtain a first mixture;
adding water and a water reducing agent into the first mixture, and stirring to obtain slurry;
adding chopped fibers into the slurry, and stirring to obtain a second mixture;
and carrying out primary curing and soaking curing on the second mixture in sequence to obtain the concrete.
10. The method for preparing high-strength and high-toughness fiber concrete based on geopolymer artificial aggregate according to claim 9, wherein the method for preparing the geopolymer artificial aggregate comprises the following steps: mixing fly ash, granulated blast furnace slag powder and alkali excitant in an aqueous solution environment to form slurry; and after the slurry is primarily solidified, crushing the slurry to a required size by adopting a crushing device, and curing to obtain the geopolymer artificial aggregate.
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