CN112876180A - Rapid hardening cementing material and preparation method and application thereof - Google Patents
Rapid hardening cementing material and preparation method and application thereof Download PDFInfo
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- CN112876180A CN112876180A CN202110255489.7A CN202110255489A CN112876180A CN 112876180 A CN112876180 A CN 112876180A CN 202110255489 A CN202110255489 A CN 202110255489A CN 112876180 A CN112876180 A CN 112876180A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A fast hardening cementing material and a preparation method and application thereof comprise the following raw materials in parts by weight: portland cement: 50-100 parts; fly ash: 10-30 parts; silica fume: 3-10 parts; sulphoaluminate cement: 5-20 parts of a solvent; accelerator: 0.5-2 parts; inorganic early strength agents: 0.5-3 parts; alcamines early strength agent: 0.05-0.1 part; calcium formate: 0.5-2 parts; water reducing agent: 0.3-2 parts, wherein the portland cement and sulphoaluminate cement are substantially free of gypsum. This application is in order to control the rate of setting within the suitable scope, adopts the portland cement and the cooperation of sulphoaluminate cement of gypsum-free to utilize accelerator, inorganic organic type early strength agent and calcium formate cooperation to set up, make can be under the condition that does not influence later stage intensity, reduce the initial set time, reach relatively high intensity as early as possible.
Description
Technical Field
The application relates to a rapid hardening cementitious material, a preparation method and application thereof.
Background
Concrete is the most widely used and most used building material in the world at present. It plays an irreplaceable role in the construction fields of building engineering, highway engineering, tunnel engineering, hydraulic engineering and special structures. Concrete structures are mainly used to bear loads or resist various external forces. However, the factors such as design, construction, external environment and durability cause the damage of concrete engineering, which affects the normal service life of the concrete. The rapid repairing material has the advantages of rapid setting and hardening, high early strength, short construction period, and rapid recovery and application after the structure is repaired. Because the special cement is fast in setting and hardening and high in early strength, the repairing material is usually made of special cement (sulphoaluminate cement, high-alumina cement, magnesium phosphate cement and the like) as a cementing material, and the ordinary portland cement is slow in setting and hardening, long in repairing period, low in bonding strength, easy to crack and less in repairing mortar use; but the special cement has the defects of poor volume stability, reversed shrinkage of strength after long-term use, high price and the like; some repairing materials are modified by using organic repairing mortar high molecular polymers such as epoxy resin, acrylic acid, polyester resin and other various resins as main raw materials and adding a certain amount of fillers, curing agents, plasticizers and the like, the resin materials have large early heating value, the hardened slurry has large brittleness and large shrinkage, the diluents, the curing agents and other additives can cause environmental pollution due to toxicity, and meanwhile, the organic materials are easy to age under the action of the environment, the durability is reduced, and the application of the organic repairing mortar in a large amount in repairing engineering is limited.
Disclosure of Invention
In order to solve the above problems, the present application provides a fast hardening cementitious material, including the following raw materials in parts by mass: 50-100 parts; fly ash: 10-30 parts; silica fume: 3-10 parts; sulphoaluminate cement: 5-20 parts of a solvent; accelerator: 0.5-2 parts; inorganic early strength agents: 0.5-3 parts; alcamines early strength agent: 0.05-0.1 part; calcium formate: 0.5-2 parts; water reducing agent: 0.3-2 parts, wherein the portland cement and sulphoaluminate cement are substantially free of gypsum. This application is in order to control the rate of setting within the suitable scope, adopts the portland cement and the cooperation of sulphoaluminate cement of gypsum-free to utilize accelerator, inorganic organic type early strength agent and calcium formate cooperation to set up, make can be under the condition that does not influence later stage intensity, reduce the initial set time, reach relatively high intensity as early as possible.
Preferably, the specific surface area of the silica fume is not less than 20000m2Per kg, the activity index is not less than 85 percent, and the water demand ratio is less than 120 weight percent.
Preferably, the accelerator is polyaluminium sulfate, the content of aluminum oxide is higher than 15.6 wt%, and the content of iron is lower than 0.7 wt%.
Preferably, the inorganic early strength agent is sodium sulfate.
Preferably, the alkanolamine early strength agent is one or a combination of more than two of polymeric alkanolamine, triethanolamine and triisopropanolamine in any proportion.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is not lower than 25%.
On the other hand, the application discloses a preparation method of the rapid hardening binding material, which comprises the following steps:
crushing clinker: crushing the portland cement clinker into particles with the particle size of less than 7mm by a crusher;
grinding the materials: adding weighed silicate cement clinker particles, polyaluminium sulfate, sodium sulfate and alcamines early strength agent into a ball mill, grinding for 25-30min, controlling the material-ball ratio to be 5% +/-0.4%, and controlling the specific surface area of powder obtained by grinding to be 300-400m2Per kg, 80 mu m sieve residue is not more than 4 percent;
mixing and homogenizing materials: and adding the ground portland cement clinker, fly ash, silica fume and calcium formate into a mixer for mixing.
Preferably, the portland cement is portland cement clinker, and is prepared by the following method: treating initial portland cement in a rotary kiln, cooling the initial portland cement in a grate cooler, and performing primary crushing to obtain a material block, wherein the content of F-CaO is less than or equal to 1.5 wt%, and SO3Content is less than or equal to 1.5 wt%, C3The content of A is less than or equal to 6wt percent, C3S and C2Total S content is not less than66 wt%. The Portland cement is used as a base material, and is subjected to curing treatment, the content of related substances is controlled, the solidification process is controlled, and particularly, an inorganic early strength agent is used for exciting C in cement clinker3A and C4AF hydration reaction, organic early strength agent promoting C3S and C2And S hydration reaction, namely the silicate cement clinker and the sulphoaluminate cement mutually promote the hydration reaction, more hydration products are formed in the early stage, the early strength is higher, the internal micro-pores are filled with silica fume, the compactness of the slurry hardened body is improved, and the higher later strength of the slurry hardened body is ensured.
In yet another aspect, the present application discloses a method for repairing a damaged concrete structure with a fast hardening cementitious material, comprising the steps of:
chiseling concrete in the area to be repaired, cleaning loose particles and impurities on the chiseling surface, and exposing a hard base layer to obtain a chiseling surface;
wetting the chiseled surface with purified water;
determining the usage amount of the mortar according to the area and the thickness of a repair area of the chiseled surface, weighing the prepared rapid hardening cementing material, sand and water in proportion, and stirring to prepare repair mortar;
immediately pouring the repair mortar into the repair area, using a vibrator to densely fill the mortar in the repair area, and using a scraper to trowel the surface;
and after the final setting time of the mortar is reached, watering, laminating and curing for a plurality of days, and then performing natural curing at a later stage to finish the repair.
Preferably, the repair mortar comprises the following raw materials in percentage by mass: fast hardening of the cement: 80-120 parts; sand: 80-120 parts; water: 30-40 parts; methyl cellulose ether: 0.02-0.05 part. The repair mortar is prepared by adopting the rapid hardening cementing material and easily stirring the rapid hardening cementing material, sand, methyl cellulose ether and water, and has the advantages of high setting and hardening speed, high early strength, small later strength loss, firm bonding with a repair surface, excellent durability, low price and the like.
This application can bring following beneficial effect:
1. the rapid hardening binding material is prepared by adopting portland cement clinker as a main binding material, and because gypsum in ordinary portland cement is removed from the binding material, the setting rate of the binding material is obviously improved, the rapid hardening effect can be achieved by adding a trace amount of accelerating agent, and the early strength effect can be achieved by adding a trace amount of early strength agent;
2. the application excites C in cement clinker by inorganic early strength agent3A and C4AF hydration reaction, organic early strength agent promoting C3S and C2S, hydration reaction is carried out, cement clinker and sulphoaluminate cement mutually promote hydration reaction, more hydration products are formed in the early stage, the early strength is higher, the internal micro-pores are subjected to silica fume, the compactness of the slurry hardened body is improved, and the higher later strength of the slurry hardened body is ensured;
3. the repair mortar is prepared by rapidly hardening the cementing material, sand, methyl cellulose ether and water through rapid and easy stirring, and has the advantages of rapid setting and hardening speed, high early strength, small later strength loss, firm bonding with a repair surface, excellent durability, low cost and the like.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present application will be explained in detail through the following embodiments.
The core of the present application is the formulation of a fast-setting cement and the method of preparation, which are mainly illustrated in the first example, which is illustrated in the form of a method since the efficacy of the formulation can only be tested or checked after it has been prepared:
the following requirements are imposed on the raw materials used for the rapid hardening cement:
the fly ash is I-grade fly ash or II-grade fly ash, the water requirement ratio is less than or equal to 95 percent, and other physical and chemical performance indexes meet the requirements of national standard fly ash for cement and concrete (GB/T1596-2017); the specific surface area of the silica fume is not less than 20000m2Per kg, the activity index is not less than 85 percent, and the water demand ratio is less than 120 weight percent; the acceleratorThe aluminum oxide is polyaluminium sulfate, the content of aluminum oxide is higher than 15.6 wt%, and the content of iron is lower than 0.7 wt%; the inorganic early strength agent is sodium sulfate; the alcamines early strength agent is one or a combination of more than two of polymeric alcamines, triethanolamine and triisopropanolamine in any proportion; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is not lower than 25%; the chemical properties and physical properties of the sulphoaluminate cement meet sulphoaluminate cement (GB 20472-2006).
As for a specific preparation method, a preparation method of the rapid hardening cementitious material comprises the following steps:
s101, Portland cement preparation: treating initial portland cement in a rotary kiln, cooling the initial portland cement by a grate cooler, and performing primary crushing to obtain a material block, wherein the content of F-CaO is less than or equal to 1.5 wt%, the content of SO3 is less than or equal to 1.5 wt%, the content of C3A is less than or equal to 6 wt%, and the total content of C3S and C2S is more than or equal to 66 wt%;
s102, crushing clinker: crushing the portland cement clinker into particles with the particle size of less than 7mm by a crusher;
s103, material grinding: and (3) weighing the following Portland cement: 0.5-1 part; sulphoaluminate cement: 0.5-2 parts; polymeric aluminum sulfate: 0.05-0.2 part; sodium sulfate: 0.05-0.3 part; alcamines early strength agent: 0.05-0.1 part; water reducing agent: 0.003 to 0.02 portion of the powder is added into a ball mill for grinding for 25 to 30 minutes, the material-ball ratio is controlled to be 5 percent +/-0.4 percent, and the specific surface area of the powder obtained by grinding is controlled to be 300-2Per kg, 80 mu m sieve residue is not more than 4 percent;
s104, mixing and homogenizing materials: grinding the ground portland cement clinker and fly ash: 0.1-0.3 part; silica fume: 0.03-0.1 part, calcium formate: 0.5-1 part of the mixture is added into a mixer for mixing; the specific formulation is shown in table 1;
table 1:
and S105, measuring the initial setting time, the final setting time and the compressive strength of the material obtained in the step S104, wherein the specific parameters are shown in Table 2.
Table 2:
in a second embodiment, considering the application of the rapid hardening cementitious material in repairing, an arc-shaped groove body is arranged on a test bed, the surface of the groove body is a relatively smooth concrete surface, the depth is not less than 15cm, and the external cross section is not less than 900cm2The test is carried out by taking the chiseled surface as a chiseled surface, and the method comprises the following steps:
s201, wetting the chiseled surface with purified water;
determining the usage amount of mortar according to the area and the thickness of a repair area of a chiseled surface, weighing the prepared rapid hardening cementing material, sand and water in proportion, and stirring to prepare the repair mortar, wherein the repair mortar comprises the following raw materials in percentage by mass: fast hardening of the cement: 80-120 parts; sand: 80-120 parts; water: 30-40 parts; methyl cellulose ether: 0.02-0.05 part; the specific formulation is shown in table 3;
table 3:
s202, immediately pouring repair mortar into a repair area, using a vibrator to enable the mortar to be densely filled in the repair area, and using a scraper to trowel the surface;
s203, after the final setting time of the mortar is reached, watering, laminating and curing for a plurality of days, and then performing natural curing at a later stage to finish the repair; specific parameters are shown in table 4;
s204, measuring the initial setting time, the final setting time and the compressive strength of the repaired part in S203, and measuring the bonding effect with the chiseled surface in the initial setting and the final setting.
Table 4:
the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A fast-setting cementitious material, characterised in that: the composite material comprises the following raw materials in parts by weight: portland cement: 50-100 parts; fly ash: 10-30 parts; silica fume: 3-10 parts; sulphoaluminate cement: 5-20 parts of a solvent; accelerator: 0.5-2 parts; inorganic early strength agents: 0.5-3 parts; alcamines early strength agent: 0.05-0.1 part; calcium formate: 0.5-2 parts; water reducing agent: 0.3-2 parts, wherein the portland cement and sulphoaluminate cement are substantially free of gypsum.
2. A fast-hardening cement according to claim 1, characterized in that: the specific surface area of the silica fume is not less than 20000m2Per kg, the activity index is not less than 85 percent, and the water demand ratio is less than 120 weight percent.
3. A fast-hardening cement according to claim 1, characterized in that: the accelerator is polyaluminium sulfate, the content of aluminum oxide is higher than 15.6 wt%, and the content of iron is lower than 0.7 wt%.
4. A fast-hardening cement according to claim 1, characterized in that: the inorganic early strength agent is sodium sulfate.
5. A fast-hardening cement according to claim 1, characterized in that: the alcamines early strength agent is one or a combination of more than two of polymeric alcamines, triethanolamine and triisopropanolamine in any proportion.
6. A fast-hardening cement according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is not lower than 25%.
7. A preparation method of a rapid hardening cementing material is characterized in that: the method comprises the following steps:
crushing clinker: crushing the portland cement clinker into particles with the particle size of less than 7mm by a crusher;
grinding the materials: adding weighed silicate cement clinker particles, polyaluminium sulfate, sodium sulfate and alcamines early strength agent into a ball mill, grinding for 25-30min, controlling the material-ball ratio to be 5% +/-0.4%, and controlling the specific surface area of powder obtained by grinding to be 300-400m2Per kg, 80 mu m sieve residue is not more than 4 percent;
mixing and homogenizing materials: and adding the ground portland cement clinker, fly ash, silica fume and calcium formate into a mixer for mixing.
8. The method for preparing a fast-setting cementitious material according to claim 7, characterized in that: the Portland cement is Portland cement clinker and is prepared by the following method: treating initial portland cement in a rotary kiln, cooling the initial portland cement in a grate cooler, and performing primary crushing to obtain a material block, wherein the content of F-CaO is less than or equal to 1.5 wt%, and SO3Content is less than or equal to 1.5 wt%, C3The content of A is less than or equal to 6wt percent, C3S and C2The total amount of S is more than or equal to 66 wt%.
9. A method of repairing a damaged concrete structure with a fast hardening cementitious material according to any one of claims 1 to 8, characterised in that it comprises the following steps:
chiseling concrete in the area to be repaired, cleaning loose particles and impurities on the chiseling surface, and exposing a hard base layer to obtain a chiseling surface;
wetting the chiseled surface with purified water;
determining the usage amount of the mortar according to the area and the thickness of a repair area of the chiseled surface, weighing the prepared rapid hardening cementing material, sand and water in proportion, and stirring to prepare repair mortar;
immediately pouring the repair mortar into the repair area, using a vibrator to densely fill the mortar in the repair area, and using a scraper to trowel the surface;
and after the final setting time of the mortar is reached, watering, laminating and curing for a plurality of days, and then performing natural curing at a later stage to finish the repair.
10. A method of repairing damaged concrete according to claim 9, wherein: the repair mortar comprises the following raw materials in percentage by mass: fast hardening of the cement: 80-120 parts; sand: 80-120 parts; water: 30-40 parts; methyl cellulose ether: 0.02-0.05 part.
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| CN113213862A (en) * | 2021-06-24 | 2021-08-06 | 山东业安建材有限公司 | Yean self-leveling super early strength rapid hardening material and preparation method thereof |
| CN113213877A (en) * | 2021-06-03 | 2021-08-06 | 厦门美益建材有限公司 | Low-temperature cement and preparation method thereof |
| CN114806506A (en) * | 2022-05-16 | 2022-07-29 | 太原理工大学 | Dust suppression material and preparation method and application thereof |
| CN116143442A (en) * | 2022-09-09 | 2023-05-23 | 上海宝田新型建材有限公司 | Desulfurized ash-based water-retaining thickening material, and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213877A (en) * | 2021-06-03 | 2021-08-06 | 厦门美益建材有限公司 | Low-temperature cement and preparation method thereof |
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| CN114806506A (en) * | 2022-05-16 | 2022-07-29 | 太原理工大学 | Dust suppression material and preparation method and application thereof |
| CN114806506B (en) * | 2022-05-16 | 2023-07-07 | 太原理工大学 | Dust suppression material and preparation method and application thereof |
| CN116143442A (en) * | 2022-09-09 | 2023-05-23 | 上海宝田新型建材有限公司 | Desulfurized ash-based water-retaining thickening material, and preparation method and application thereof |
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Application publication date: 20210601 |