CN108585662B - Light permeable concrete pedestrian pavement brick and preparation method thereof - Google Patents
Light permeable concrete pedestrian pavement brick and preparation method thereof Download PDFInfo
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- CN108585662B CN108585662B CN201810536459.1A CN201810536459A CN108585662B CN 108585662 B CN108585662 B CN 108585662B CN 201810536459 A CN201810536459 A CN 201810536459A CN 108585662 B CN108585662 B CN 108585662B
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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
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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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Abstract
The invention provides a light pervious concrete pavement brick, belonging to the technical field of building materials. The paint comprises the following components in percentage by mass: 20-30% of ground slag, 5-10% of cement, 5-10% of fly ash, 15-30% of ceramic sand, 0-10% of river sand, 2-4% of an activator, 3-5% of a saltpetering inhibitor, 0.1-0.3% of a physical foaming agent, 2-4% of a chemical foaming agent, 1-3% of manganese dioxide, 2-4% of potassium carbonate, 1-3% of a water reducing agent and 15-25% of water. The invention also provides a preparation method of the pedestrian pavement brick. The invention discloses a light permeable concrete pavement brick, which adopts a staged physical and chemical synergistic foaming method for the first time, wherein a large number of closed air holes are formed in a matrix through a physical foaming agent, and then adjacent air holes are communicated through the continuous air-entraining action of a chemical foaming agent, so that a large number of communicated pores are formed in concrete. The product of the invention has better water permeability and water storage performance and wide popularization and application prospect.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a lightweight pervious concrete pavement brick and a preparation method thereof.
Background
The sponge city is a novel city rainfall flood management concept recently proposed by the nation, and the rainwater is required to be ensured to permeate, stay and purify in the city on the basis of urban drainage and waterlogging prevention, so that the rainwater can be fully utilized, the benign water circulation of the city is realized, and the aim of improving ecological protection is fulfilled. The pervious concrete is highly matched with the construction concept of sponge cities by virtue of high-efficiency water permeability, and is gradually developed into a main base material for the construction of the sponge cities. However, the existing permeable concrete achieves the purpose of permeable by mainly interlocking internal aggregates to form pores, the water storage capacity of the material is limited, the foam concrete contains a large amount of uniform and closed bubbles, the foam concrete has extremely strong water storage performance, and if the foam concrete can be subjected to pore opening treatment by a technical means, the foam concrete is bound to become an ideal permeable paving material.
Chinese patent CN201611207725 discloses a water-permeable foam concrete which is prepared from the following raw materials in parts by weight: 420 parts of cement 160-420, 0.2-0.4 part of foaming agent, 2-5 parts of water reducing agent, 1-5 parts of swelling agent, 1-5 parts of plasticizer and 90-150 parts of water. The technical means adopted by the invention is that a plurality of flocculating agents which destroy the pore structure are added to flocculate the formed foam and break the pore structure, thereby realizing the purpose of pore connection. It should be noted that in the above patent documents, the flocculant is some organic polymer materials, which are extremely difficult to disperse uniformly in the foaming agent and are extremely easy to precipitate at a later stage, so that the effect of achieving the purpose of pore connection by only the flocculant is extremely limited.
Chinese patent CN201710257565 discloses a permeable foam concrete and a preparation method thereof, wherein the permeable foam concrete is prepared from the following raw materials in parts by weight: 45-55 parts of cement, 5-8 parts of extra-fine sand, 20-35 parts of water, 8-15 parts of admixture, 3-8 parts of foam, 0.1-0.5 part of fiber, 0.01-0.05 part of cellulose ether and 0.1-0.4 part of water reducing agent. The technical means adopted by the invention is to mix coarse fibers with larger size into a foam concrete matrix, so that the foam concrete cells form a communicating pore channel taking the fibers as a conduit. However, in the above patent documents, the direction of the fibers in the interior of the foam concrete matrix greatly affects the open porosity of the foam concrete bubbles, resulting in the water permeability of the foam concrete being lower than expected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the light permeable concrete pavement brick and the preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the light permeable concrete pavement brick comprises the following components in percentage by mass: 20-30% of ground slag, 5-10% of cement, 5-10% of fly ash, 15-30% of ceramic sand, 0-10% of river sand, 2-4% of an activator, 3-5% of a saltpetering inhibitor, 0.1-0.3% of a physical foaming agent, 2-4% of a chemical foaming agent, 1-3% of manganese dioxide, 2-4% of potassium carbonate, 1-3% of a water reducing agent and 15-25% of water.
As a specific embodiment of the light pervious concrete pavement brick, the light pervious concrete pavement brick comprises the following components in percentage by mass: 23-27% of ground slag, 7-9% of cement, 6-8% of fly ash, 20-25% of ceramic sand, 4-7% of river sand, 3-4% of an activator, 4-5% of a saltpetering inhibitor, 0.2-0.25% of a physical foaming agent, 3-3.5% of a chemical foaming agent, 2-3% of manganese dioxide, 3-4% of potassium carbonate, 2-3% of a water reducing agent and 20-25% of water.
As a specific embodiment of the light pervious concrete pedestrian pavement brick, the ground slag is S95-grade mineral powder, and the specific surface area is 420-450 m2The activity index of/kg, 28d is not less than 98 percent; the fly ash is I-grade fly ash, the 45-micron sieve residue is not more than 10%, the water demand ratio is not more than 93%, the ceramic sand is shale ceramic sand, and the bulk density is 700-800 kg/m3The maximum grain size is 2.36 mm; the maximum particle size of the river sand is 0.6mm, the fineness modulus is 0.8-1.0, and the mud content is not more than 1.0%.
As a specific embodiment of the light pervious concrete pavement brick, the exciting agent comprises 70-80% of water glass and 20-30% of plaster of paris, and the components are calculated according to mass percentageThe sum is 100%. Furthermore, the modulus of the water glass is 1.2-1.5. Water glass is used as excitant, and SiO in the water glass is regulated2/Na2The mole ratio (modulus) of O can make Si-O bond in the ground slag quickly break and form a large amount of active ≡ Si-O-group in the slurry, so that the hydration activity of the ground slag is obviously improved.
As a specific embodiment of the light pervious concrete pavement brick, the saltpetering inhibitor comprises 50-100% of zeolite, 0-40% of bentonite and 0-50% of diatomite by mass, and the sum of the components is 100%.
As a specific embodiment of the light pervious concrete pavement brick, the zeolite is 5A zeolite with pore diameter
The bentonite is calcium bentonite, the sucking amount is 35-40 me/100g, the colloidal value is 60-70 ml/15g, and the montmorillonite content is 55-65%; SiO in the diatomite2The content is not less than 90%.
The 5A zeolite, the calcium bentonite and the diatomite are porous or layered substances and have extremely strong adsorption capacity or ion exchange capacity. The calcium ions in the 5A zeolite can be fixed by ion exchange reaction with free alkali metal sodium ions introduced by an exciting agent in the slurry, and the calcium bentonite and the kieselguhr can absorb a large amount of free sodium ions due to the extremely strong adsorption capacity of the calcium bentonite and the kieselguhr, so that the phenomena of efflorescence and frosting on the surface of a brick body can be effectively inhibited, and the apparent effect of the brick body is improved.
As a specific embodiment of the light pervious concrete pavement brick, the physical foaming agent comprises, by mass, 0-100% of sodium lauroyl glutamate, 0-100% of fatty alcohol-polyoxyethylene ether sodium sulfate and 0-100% of lauryl sodium sulfate, and the sum of the components is 100%.
As a specific embodiment of the light pervious concrete pavement brick, the chemical foaming agent is hydrogen peroxide; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is 12.5-14.0%, and the water reducing rate is not less than 25%.
The addition of potassium carbonate can not only react with calcium hydroxide generated by cement hydration to generate insoluble calcium carbonate, obviously shorten the setting time of the cement, but also reduce the freezing point of water and promote the low-temperature hydration of the cement, thereby improving the early strength and the frost resistance of the brick body.
The invention also provides a preparation method of the light pervious concrete pedestrian pavement brick, which comprises the following steps:
1) weighing the raw materials according to the mass percentage of the raw materials;
2) mixing and stirring cement, ground slag, fly ash, ceramic sand, river sand, an activator, a saltpetering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water until uniform slurry is formed;
3) preparing a physical foaming agent into foam, directly injecting the foam into the uniform slurry obtained in the step 2) in the foaming process, and uniformly stirring until the foaming of the physical foaming agent is finished;
4) adding a chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring to ensure that the chemical foaming agent is uniformly dispersed in the foam concrete, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
As a specific embodiment of the preparation method of the light pervious concrete pavement brick, the physical foaming agent is prepared into foam by a compressed air method.
As a specific embodiment of the preparation method of the lightweight pervious concrete pavement brick, in the step 2), the stirring speed is 100-200 r/min; in the step 3), the stirring speed is 60-80 r/min; in the step 4), the stirring speed is 40-60 r/min, and the stirring time is 25-40 s.
The light pervious concrete pavement brick prepared according to the scheme can realize that the density and the strength of a brick body can be adjusted by adjusting the relative content of each component according to engineering requirements, and meets the requirements of different pavement performances of a pavement.
The invention adopts a staged physical and chemical synergistic foaming method for the first time. A large number of uniform bubbles are formed in the matrix by anionic surfactants such as lauroyl glutamate, alkyl sulfate and the like, and the bubbles generated by the surfactants have thin film walls and poor foam stability, so that the bubbles are easy to break to form partial connecting holes particularly in the strong alkaline environment of the invention. And adding hydrogen peroxide to continuously decompose the mixture under the catalytic action of manganese dioxide to generate oxygen, and further opening air holes under the pressure action of the oxygen, so that a large number of communicated pores are formed in the concrete, and the foam concrete has better water permeability and water storage performance.
Compared with the prior art, the invention has the following beneficial effects:
1. energy conservation and environmental protection. The invention adopts an alkali-slag glue material system, mainly takes industrial solid waste slag as a cementing material, has low cement consumption, and is energy-saving and environment-friendly. After zeolite, bentonite, diatomite and other substances are doped, the ion exchange property and the adsorption performance of the brick are utilized, the phenomena of efflorescence and frosting on the surface of the brick body can be effectively inhibited, and the apparent effect of the brick is improved.
2. The water permeability and water storage performance are good. By adopting the stage type physical and chemical synergistic foaming method, the intercommunicating pore ratio of the foam concrete can be greatly improved, the average pore diameter of the foam concrete is increased, and compared with common pervious concrete, the foam concrete has water permeability and water storage performance.
3. The density and the strength are adjustable. The invention can adjust the relative content of each component according to the pavement performance of the pavement, and realizes that the density of the brick body is 600-1500 kg/m3And the strength is adjustable within 2-18 MPa.
4. Has wide application prospect. The highest water permeability coefficient of the pedestrian pavement brick can reach 1.4mm/s, and the highest water retention can reach 2.8g/cm2The water permeability and the water storage performance are far higher than the standard requirements of the water permeable brick, and the water permeable brick is an ideal substitute material for the water permeable brick of the prior sidewalk and has wide popularization and application prospects.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a lightweight pervious concrete pedestrian pavement brick, which is prepared by compounding ground slag, cement, fly ash, ceramic sand, river sand, an excitant, a saltpetering inhibitor, a physical foaming agent, a chemical foaming agent, manganese dioxide, potassium carbonate, a water reducing agent and water, wherein the specific formula is shown in table 1. The starting components are either commercially available or may be prepared by corresponding methods, which are also conventional to the skilled person.
TABLE 1 proportioning of light pervious concrete pavement bricks (by mass percent)
Remarking: SHG-sodium lauroyl glutamate; SAES-sodium fatty alcohol polyoxyethylene ether sulphate; SDS-sodium dodecyl sulfate.
In the embodiment of the invention, various raw materials are required to be accurately weighed according to the proportion, and the weighing error is required to be less than 1 percent; in the following examples, the reagents or starting materials are all commercially available reagents or industrial products unless otherwise specified.
In the following examples, the cement is Chongqing Zhushan Jidong P.O42.5R cement, the ground slag is Chongqing Changshou Yu Hongshan S95-grade mineral powder, and the specific surface area is 420-450 m2The activity index of each kg and 28d is 98 percent, and the fly ash is I-grade fly ash of Chongqing JiangjinloAsh, 8 percent of 45 mu m screen residue and 91 percent of water requirement, and the ceramic sand bulk density is 800kg/m3The maximum grain size is 2.36mm, the maximum grain size of the river sand is 0.6mm, the fineness modulus is 0.9, the mud content is 0.8 percent, and the aperture of the 5A zeolite is
The sucking capacity of the calcium-based bentonite is 37me/100g, the colloidal value is 64ml/15g, the montmorillonite content is 58 percent, and the SiO content of the diatomite is2The content is 91%.
Example 1
In the light permeable concrete pavement brick, the alkali activator is prepared by mixing and stirring water glass (modulus is 1.3) and plaster according to the mass ratio of 4:1, the whiskering inhibitor is 100% of 5A zeolite, the physical foaming agent is 100% SHG, and SHG powder weighed according to the proportion is prepared into a foaming agent solution with the concentration of 0.3% for later use before use; the weighed pottery sand needs to be wetted to reach a saturated face dry state.
The preparation process of the light permeable concrete pavement brick of the embodiment is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 10% of cement, 10% of fly ash, 15% of ceramic sand, 5% of river sand, 2% of an alkaline activator, 5% of a saltpetering inhibitor, 0.2% of a physical foaming agent, 2% of a chemical foaming agent, 1% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 19.8% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, river sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and uniformly stirring to obtain uniform slurry, wherein the stirring speed is 150 r/min.
3) Foaming a physical foaming agent (SHG) solution by adopting a compressed air method, directly injecting foam into the uniform slurry obtained in the step 2) in the foaming process, and uniformly stirring at the stirring speed of 60r/min until the foaming of the physical foaming agent is finished.
4) And (3) adding the weighed chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring at the stirring speed of 50r/min for 30s, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
In the embodiment, the absolute dry density of the prepared light pervious concrete pavement brick is 1000kg/m328d compressive strength of 11.6MPa, water permeability coefficient of 0.98mm/s and water retention of 1.8g/cm2。
Example 2
In the light pervious concrete pavement brick, an alkaline activator is prepared by mixing water glass (modulus is 1.2) and plaster according to a mass ratio of 3:1, a whiskering inhibitor is prepared by mixing 5A zeolite and calcium bentonite according to a mass ratio of 3:2, a physical foaming agent is 100% SAES, and SAES powder weighed according to a proportion is prepared into a foaming agent solution with a concentration of 0.3% for later use before use; the weighed pottery sand needs to be wetted to reach a saturated face dry state.
The preparation process of the light permeable concrete pavement brick of the embodiment is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 30% of ground slag, 10% of cement, 10% of fly ash, 5% of ceramic sand, 10% of river sand, 4% of an alkaline activator, 5% of a saltpetering inhibitor, 0.1% of a physical foaming agent, 2% of a chemical foaming agent, 1% of manganese dioxide, 2% of potassium carbonate, 3% of a water reducing agent and 17.9% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, river sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and uniformly stirring to obtain uniform slurry, wherein the stirring speed is 150 r/min.
3) Foaming a physical foaming agent (SAES) solution by adopting a compressed air method, directly injecting foam into the obtained uniform slurry in the foaming process, and uniformly stirring at the stirring speed of 80r/min until the foaming of the physical foaming agent is finished.
4) And (3) adding the weighed chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring at the stirring speed of 50r/min for 30s, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
In this example, the prepared lightweight pervious concrete sidewalkThe absolute dry density of the face brick is 1500kg/m328d compressive strength of 18.0MPa, water permeability coefficient of 0.65mm/s and water retention of 1.0g/cm2。
Example 3
A light pervious concrete pavement brick is prepared by mixing water glass (modulus is 1.2) and plaster of paris according to the mass ratio of 7:3, a whiskering inhibitor is prepared by mixing 5A zeolite and diatomite according to the mass ratio of 1:1, a physical foaming agent is 100% SDS, and SDS powder weighed according to the proportion is prepared into a foaming agent solution with the concentration of 0.3% for standby application before use; the weighed pottery sand needs to be wetted to reach a saturated face dry state.
The preparation process of the light permeable concrete pavement brick of the embodiment is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 5% of cement, 5% of fly ash, 25% of ceramic sand, 2% of an alkaline activator, 3% of a whiskering inhibitor, 0.3% of a physical foaming agent, 4% of a chemical foaming agent, 3% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 22.7% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and stirring uniformly to obtain uniform slurry, wherein the stirring speed is 100 r/min.
3) Foaming a physical foaming agent (SDS) solution by adopting a compressed air method, directly injecting foam into the obtained uniform slurry in the foaming process, and uniformly stirring at the stirring speed of 60r/min until the foaming of the physical foaming agent is finished.
4) And (3) adding the weighed chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring at the stirring speed of 50r/min for 30s, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
In the embodiment, the absolute dry density of the prepared light pervious concrete pavement brick is 600kg/m328d compressive strength of 2.3MPa, water permeability coefficient of 1.4mm/s and water retention of 2.8g/cm2。
Example 4
A light pervious concrete pavement brick is prepared by mixing water glass (modulus is 1.5) and plaster of paris according to the mass ratio of 4:1, a whiskering inhibitor is prepared by mixing 5A zeolite, calcium bentonite and diatomite according to the mass ratio of 5:2:3, a physical foaming agent is prepared by mixing SHG, SAES and SDS according to the mass ratio of 6:2:2, and before use, the physical foaming agent composite powder weighed according to the proportion is prepared into a foaming agent solution with the concentration of 0.3% for standby; the weighed pottery sand needs to be wetted to reach a saturated face dry state.
The preparation process of the light permeable concrete pavement brick of the embodiment is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 10% of cement, 5% of fly ash, 22% of ceramic sand, 3% of an alkaline activator, 4% of a whiskering inhibitor, 0.2% of a physical foaming agent, 3% of a chemical foaming agent, 2% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 20.8% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and stirring uniformly to obtain uniform slurry, wherein the stirring speed is 100 r/min.
3) Foaming the physical foaming agent solution by adopting a compressed air method, directly injecting foam into the obtained uniform slurry in the foaming process, and uniformly stirring at the stirring speed of 70r/min until the foaming of the physical foaming agent is finished.
4) And (3) adding the weighed chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring at the stirring speed of 40r/min for 30s, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
In the embodiment, the absolute dry density of the prepared light pervious concrete pavement brick is 800kg/m328d compressive strength of 3.2MPa, water permeability coefficient of 1.1mm/s and water retention of 2.2g/cm2。
In order to highlight the novelty of the invention, a comparative analysis was carried out on example 1 above.
Comparative example 1
In this comparative example, no physical blowing agent was added, the amounts of the remaining key components were in accordance with example 1, and the amount of physical blowing agent was replaced with water.
The preparation process of the light permeable concrete pavement brick of the comparative example is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 10% of cement, 10% of fly ash, 15% of ceramic sand, 5% of river sand, 2% of an alkaline activator, 5% of a saltpetering inhibitor, 2% of a chemical foaming agent, 1% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 20% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, river sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and uniformly stirring to obtain uniform slurry, wherein the stirring speed is 150 r/min.
3) Adding the weighed chemical foaming agent into the slurry obtained in the step 2), uniformly stirring at the stirring speed of 50r/min for 30s, injecting the uniformly mixed concrete into a forming die, standing and demolding.
In the comparative example, the absolute dry density of the prepared lightweight pervious concrete pavement brick is 1580kg/m328d compressive strength of 17.6MPa, water permeability coefficient of 0mm/s and water retention of 0.3g/m2。
Comparative example 2
In this comparative example, the physical blowing agent was incorporated in the cement in the form of a powder, i.e. not foamed by the compressed air process, but by stirring. The amounts of the components were kept as in example 1.
The preparation process of the light permeable concrete pavement brick of the comparative example is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 10% of cement, 10% of fly ash, 15% of ceramic sand, 5% of river sand, 2% of an alkaline activator, 5% of a saltpetering inhibitor, 0.2% of a physical foaming agent, 2% of a chemical foaming agent, 1% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 19.8% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, river sand, a physical foaming agent, an alkaline activator, a saltpetering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and uniformly stirring to obtain foam concrete slurry, wherein the stirring speed is 150 r/min.
3) Adding the weighed chemical foaming agent into the foam concrete obtained in the step 2), uniformly stirring at the stirring speed of 50r/min for 30s, injecting the uniformly mixed foam concrete into a forming die, standing and demolding.
In the comparative example, the absolute dry density of the prepared lightweight pervious concrete pavement brick is 1230kg/m328d compressive strength of 13.4MPa, water permeability coefficient of 0.73mm/s and water retention of 1.0g/cm2。
Comparative example 3
In the comparative example, the chemical foaming agent is added first, and then the physical foaming agent is added, namely, the adding sequence of the chemical foaming agent and the physical foaming agent is changed. The amounts of the components were kept as in example 1.
The preparation process of the light permeable concrete pavement brick of the comparative example is as follows:
1) weighing the raw materials, wherein the raw materials account for the following mass percent: 25% of ground slag, 10% of cement, 10% of fly ash, 15% of ceramic sand, 5% of river sand, 2% of an alkaline activator, 5% of a saltpetering inhibitor, 0.2% of a physical foaming agent, 2% of a chemical foaming agent, 1% of manganese dioxide, 4% of potassium carbonate, 1% of a water reducing agent and 19.8% of water.
2) Placing the ground slag, cement, fly ash, ceramic sand, river sand, an alkaline activator, a whiskering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water in a stirring pot, and uniformly stirring to obtain uniform slurry, wherein the stirring speed is 150 r/min.
3) Adding the weighed chemical foaming agent into the slurry obtained in the step 2), and uniformly stirring at the stirring speed of 50r/min for 30 s.
4) Foaming a physical foaming agent (SHG) solution by adopting a compressed air method, directly injecting foam into the slurry obtained in the step 3) in the foaming process, and uniformly stirring at the stirring speed of 60r/min until the foaming of the physical foaming agent is finished. And injecting the uniformly mixed foam concrete into a forming die, standing and demoulding.
In this comparative example, a lightweight sample was preparedThe absolute dry density of the permeable concrete pedestrian pavement brick is 1050kg/m328d compressive strength of 12.1MPa, water permeability coefficient of 0.87mm/s and water retention of 1.4g/cm2。
As can be seen from comparative examples 1 to 3: when no physical foaming agent is added (comparative example 1), the oven-dry density of the brick body is far greater than that of example 1, and the interior of the brick body is almost free of communicating pores, which is specifically represented by that the water permeability coefficient of the brick body is 0 (almost impermeable), and the water retention is extremely poor. ② when the physical foaming agent was added to the slurry in the form of powder (comparative example 2), since the foaming efficiency of the physical foaming agent at this time was far lower than that of the air compression foaming, the oven dry density of the brick body was significantly higher than that of example 1, and the water permeability and water retention of the brick body were deteriorated. After the sequence of physical foaming and chemical foaming is changed (comparative example 3), although the absolute dry density of the brick body is not greatly influenced, the intercommunicating pore rate of the brick body is obviously influenced, and the concrete expression is that the water permeability coefficient and the water retention property of the brick body are obviously reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The light permeable concrete pavement brick is characterized by comprising the following components in percentage by mass: 20-30% of ground slag, 5-10% of cement, 5-10% of fly ash, 15-30% of ceramic sand, 0-10% of river sand, 2-4% of an activator, 3-5% of a saltpetering inhibitor, 0.1-0.3% of a physical foaming agent, 2-4% of a chemical foaming agent, 1-3% of manganese dioxide, 2-4% of potassium carbonate, 1-3% of a water reducing agent and 15-25% of water;
the excitant comprises 70-80% of water glass and 20-30% of plaster of paris, the sum of the components is 100%, wherein the modulus of the water glass is 1.2-1.5;
the saltpetering inhibitor comprises 50-100% of zeolite, 0-40% of bentonite and 0-50% of diatomite, and the sum of the components is 100%;
the zeolite is 5A zeolite with pore diameter
The bentonite is calcium bentonite, the blue absorption amount is 35-40 me/100g, the colloid value is 60-70 ml/15g, and the montmorillonite content is 55-65%; SiO in the diatomite2The content is not less than 90 percent;
the preparation method of the light pervious concrete pedestrian pavement brick comprises the following steps:
1) weighing the raw materials according to the mass percentage of the raw materials;
2) mixing and stirring cement, ground slag, fly ash, ceramic sand, river sand, an activator, a saltpetering inhibitor, manganese dioxide, potassium carbonate, a water reducing agent and water until uniform slurry is formed;
3) preparing a physical foaming agent into foam, directly injecting the foam into the uniform slurry obtained in the step 2) in the foaming process, and uniformly stirring until the foaming of the physical foaming agent is finished;
4) adding a chemical foaming agent into the foam concrete obtained in the step 3), uniformly stirring to ensure that the chemical foaming agent is uniformly dispersed in the foam concrete, injecting the uniformly mixed foam concrete into a forming die, standing and demolding to obtain the light permeable concrete pavement brick.
2. The light permeable concrete pavement brick as claimed in claim 1, wherein the ground slag is S95 grade mineral powder, and the specific surface area is 420-450 m2The activity index of/kg, 28d is not less than 98 percent; the fly ash is I-grade fly ash, the 45-micron sieve residue is not more than 10%, the water demand ratio is not more than 93%, the ceramic sand is shale ceramic sand, and the bulk density is 700-800 kg/m3The maximum grain size is 2.36 mm; the maximum particle size of the river sand is 0.6mm, the fineness modulus is 0.8-1.0, and the mud content is not more than 1.0%.
3. The light pervious concrete pavement brick as claimed in claim 1, wherein the physical foaming agent comprises, by mass, 0-100% of sodium lauroyl glutamate, 0-100% of sodium fatty alcohol-polyoxyethylene ether sulfate, 0-100% of sodium dodecyl sulfate, and the sum of the components is 100%.
4. The lightweight water-permeable concrete pavement brick as claimed in claim 1, wherein the chemical foaming agent is hydrogen peroxide; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is 12.5-14.0%, and the water reducing rate is not less than 25%.
5. The lightweight water permeable concrete pavement brick according to claim 1, wherein the physical blowing agent is foamed by a compressed air process.
6. The light permeable concrete pavement brick as claimed in claim 1, wherein in the step 2), the stirring speed is 100-200 r/min; in the step 3), the stirring speed is 60-80 r/min; in the step 4), the stirring speed is 40-60 r/min, and the stirring time is 25-40 s.
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| CN111533536A (en) * | 2020-05-09 | 2020-08-14 | 山东瑞泓智能科技有限公司 | Ecological environment-friendly treatment method for garbage |
| CN114702261A (en) * | 2022-04-08 | 2022-07-05 | 新疆越隆达再生资源科技有限公司 | Alkali inhibitor for cement-based decorative mortar and preparation method thereof |
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| CN103819125B (en) * | 2013-12-03 | 2015-09-23 | 福建建工建材科技开发有限公司 | A kind of high-strength water-permeable brick additive and preparation method thereof |
| CN104130006B (en) * | 2014-08-04 | 2015-09-23 | 马鞍山十七冶工程科技有限责任公司 | The foamed concrete that a kind of stalk fibre strengthens and preparation method |
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