CN111689738A - Environment-friendly recycled concrete and preparation process thereof - Google Patents
Environment-friendly recycled concrete and preparation process thereof Download PDFInfo
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- CN111689738A CN111689738A CN202010624705.6A CN202010624705A CN111689738A CN 111689738 A CN111689738 A CN 111689738A CN 202010624705 A CN202010624705 A CN 202010624705A CN 111689738 A CN111689738 A CN 111689738A
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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
- C04B28/04—Portland cements
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
Abstract
The invention relates to environment-friendly recycled concrete and a preparation process thereof, belonging to the technical field of concrete, wherein the environment-friendly recycled concrete comprises the following components in parts by weight: 450 parts of cement, 30-90 parts of fly ash, 40-70 parts of slag powder, 690 parts of natural coarse aggregate, 350 parts of regenerated coarse aggregate, 620 parts of regenerated fine aggregate, 10-55 parts of latex powder and 200 parts of water 140, and the invention has the effect of high impermeability; a preparation process of environment-friendly recycled concrete comprises the step of uniformly mixing all components.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to environment-friendly recycled concrete and a preparation process thereof.
Background
Concrete is one of the largest building materials in the current generation, and the amount of sand aggregate accounts for more than 70% of the total amount of concrete in several raw materials of concrete, namely about 1700-2000 kg of aggregate is needed for producing 1m3 concrete, which is very large. With the increase of the consumption of concrete and the improvement of environmental awareness of people, the problems of resource exhaustion and environmental destruction caused by mining sandstone aggregates become the focus of attention of people. Accordingly, finding a substitute for sandstone aggregate and maintaining the sustainable development of concrete materials have also become a research hotspot of concrete science. Meanwhile, with the continuous, stable and rapid development of national economy of China, the scale of engineering construction is enlarged year by year, and the quantity of construction waste generated in the engineering construction process is also greatly increased. Therefore, how to manage and effectively treat these wastes is also one of the main problems that the construction industry cannot avoid in its development and must solve.
The prior reference publication No. CN106431106B discloses recycled concrete produced by using recycled aggregate, which comprises the following raw materials in percentage by mass: 37-55% of regenerated coarse aggregate, 17-37% of regenerated fine aggregate, 15-22% of P.O.42.5 cement and 8-12% of water; the particle size of the recycled coarse aggregate is 5-31.5mm, and the particle size of the recycled fine aggregate is less than 5 mm; the recycled coarse aggregate consists of 35-40% by mass of recycled coarse aggregate with the particle size of 5-20mm and 60-65% by mass of recycled coarse aggregate with the particle size of 20-31.5 mm.
The above prior art solutions have the following drawbacks: the recycled aggregate is used for completely replacing natural aggregate, concrete waste and brick waste are subjected to large external force in the crushing process, a large number of fine cracks are easy to appear in the recycled aggregate, so that the porosity of the recycled aggregate is increased, harmful gas, liquid and the like are easy to permeate into the recycled concrete, the impermeability of the recycled concrete is poor, and the durability of the recycled concrete is weakened.
Disclosure of Invention
The invention aims to provide environment-friendly recycled concrete with high impermeability.
The above object of the present invention is achieved by the following technical solutions:
the environment-friendly recycled concrete with high impermeability comprises the following components in parts by weight: 450 parts of cement-containing material 250, 30-90 parts of fly ash, 40-70 parts of slag powder, 690 parts of natural coarse aggregate-containing material 530, 564 parts of regenerated coarse aggregate-containing material 350, 620 parts of regenerated fine aggregate-containing material 500, 10-55 parts of latex powder, 200 parts of water-containing material 140, and the regenerated coarse aggregate and the regenerated fine aggregate are modified by microbial mineralization deposition.
By adopting the technical scheme, after the latex powder is mixed with water in concrete, the latex powder is emulsified and dispersed in water to generate stable polymer emulsion, a polymer film is formed in mortar along with the hydration reaction of cement and the evaporation of water, a plurality of cracks and capillary pores are cut off, the water invasion can be blocked, and the impermeability is improved; meanwhile, a polymer film formed by the latex powder has better adhesion, so that the connection between the aggregates at the two sides of the polymer film and the cement paste or between the aggregates and the cement paste is stronger.
The invention is further configured to: the steps of the modification of the mineralization and deposition of the microorganisms are as follows:
a1: inoculating Bacillus pseudodurans into microorganism culture medium, culturing to obtain microorganism culture solution, mixing with mineralized culture solution to obtain a mixture with a concentration of 107-109Bacterial suspension per mL;
adding 850mL of water into 3g of peptone and 10g of beef extract, uniformly mixing to obtain c, adding 22.13g of CAPS into water to reach a constant volume of 150mL to obtain d, and mixing the c and the d to obtain a microbial culture solution;
adding 7.5mL of L-sodium lactate into 850mL of water to obtain a, adding 22.13g of CAPS into 150mL of water to obtain b, adding calcium hydroxide into a, uniformly mixing a and b, and adjusting the pH to 9.5-11 to obtain a mineralized culture solution with the calcium ion concentration of 9-11 g/L;
a2: adding the bacterial suspension into the regenerated fine aggregate and the regenerated coarse aggregate until the bacterial suspension does not exceed the regenerated fine aggregate and the regenerated coarse aggregate, and the submergence height of the bacterial suspension does not exceed 5mm of the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate, soaking for 17-25 days at 33-38 ℃, and then placing the aggregates in a vacuum drying oven for drying at 50-60 ℃.
By adopting the technical scheme, CAPS (3-cyclohexylaminopropane sulfonic acid) is used as a buffer solution, calcium hydroxide is used for providing a carbon source for the bacillus pseudofirmus, and the aerobic microorganism bacillus pseudofirmus breathes to generate carbon dioxide, the carbon dioxide and OH in the solution-Reaction to CO3 2+Then reacting with Ca in cement paste under alkaline condition2+Continued reaction to form CaCO3The crystal and the calcium carbonate crystal are deposited in the cracks of the recycled fine aggregate and the recycled coarse aggregate, so that the tiny cracks on the back of the recycled fine aggregate and the recycled coarse aggregate are repaired, the calcium carbonate crystal has good compatibility and interface strength with concrete, the durability is good, the strength of the recycled fine aggregate and the recycled coarse aggregate is improved, the water absorption of the calcium carbonate crystal is greatly reduced, and the impermeability of the concrete is favorably reduced.
The invention is further configured to: the mineralized and deposited modified recycled coarse aggregate is further modified by infiltration crystallization:
b1: adding supersaturated calcium hydroxide solution into the regenerated coarse aggregate until the bacteria solution is 0-5mm above the surface of the regenerated coarse aggregate, and soaking for 24-48 hours;
b2: and (3) uniformly coating the deep penetration crystallization sealing waterproof agent on the surface of the recycled coarse aggregate obtained from B1, and standing for 22-36 days.
By adopting the technical scheme, the calcium hydroxide solution is soaked into the gaps of the regenerated coarse aggregate, a small amount of calcium hydroxide is deposited into the gaps of the regenerated coarse aggregate, then the sealing waterproof agent is coated on the surface of the regenerated coarse aggregate along with the deep penetration crystallization, and the sealing waterproof agent and the free calcium hydroxide in the regenerated coarse aggregate generate chemical reaction to generate stable dendritic crystal colloid so as to further effectively block larger micro cracks in the regenerated coarse aggregate, so that the regenerated coarse aggregate has a lasting waterproof function and better compactness and compressive strength, and the impermeability of concrete is also improved.
The invention is further configured to: the recycled fine aggregate modified by mineralization and deposition and the recycled coarse aggregate modified by permeation and crystallization are further subjected to the following hydrophobic modification:
adding 8-12% of PVA solution into the mineralized, deposited and modified regenerated fine aggregate and the regenerated coarse aggregate which is modified by permeation crystallization, enabling the PVA solution to be over the regenerated fine aggregate and the regenerated coarse aggregate, enabling the height of the PVA solution over the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate to be not more than 5mm, and soaking for 20-30 hours under vacuum pressure.
By adopting the technical scheme, PVA is also called polyvinyl alcohol and is a water-soluble polymer, the bonding property and the waterproof property of cement are improved, the water absorption property of the recycled fine aggregate and the recycled coarse aggregate can be reduced, larger gaps between bonding interfaces between the PVA and cement paste are avoided due to larger water-cement ratio, the impermeability is improved, the bonding strength between the recycled fine aggregate and the recycled coarse aggregate and the cement paste is improved due to the non-uniformity of the surfaces of the recycled fine aggregate and the recycled coarse aggregate and the bonding property of the PVA, and the macromolecular PVA is beneficial to further filling of cracks of the recycled fine aggregate and the recycled coarse aggregate, the permeability is further reduced, and the impermeability of concrete is improved.
The invention is further configured to: the particle size of the natural coarse aggregate is 10-25mm continuous gradation, the particle size of the recycled coarse aggregate is 5-20mm continuous gradation, and the particle size of the recycled fine aggregate is 1-4.0mm continuous gradation.
By adopting the technical scheme, the concrete is compact and has small gaps due to the grain size grading and the proportion of each component, so that the impermeability is good.
The invention is further configured to: according to the weight portion, the water reducing agent also comprises 1.5 to 4 portions of water reducing agent and 0.01 to 0.04 portion of air entraining agent.
By adopting the technical scheme, the water reducing agent can be adsorbed on the surfaces of the cement particles, the cement particles can be well separated, the surface tension between cement and water is reduced, the contact area between the cement particles and the water is enlarged, so that the cement particles can fully react with the water, the consumption of the water is reduced, the water cement ratio is reduced, the capillary gaps left after the water participates in the reaction are reduced, and the impermeability of the concrete is improved;
on the water interface, the hydrophobic group of the air entraining agent is adsorbed to the air surface in a directional way, on the cement-water interface, cement or hydrated particles thereof are adsorbed to the hydrophilic group of the air entraining agent, the hydrophobic group deviates from the cement and the hydrated particles thereof to form a hydrophobic adsorption layer, and tries to approach the air surface, so that a large number of micro bubbles are generated in the concrete mixing process, the bubbles carry the same charges, so that the bubbles repel each other and can be distributed more uniformly, the capillary water seepage channels in the concrete can be blocked by the concrete at the bubble position, the gap characteristic of the concrete is improved, the impermeability and the frost resistance of the concrete are improved, and the generated micro holes also improve the frost resistance of the concrete, so that the durability of the concrete is improved;
furthermore, the bubble holes formed by the air entraining agent and the polymer film formed by the latex powder are blocked cooperatively, so that a better anti-permeability effect is achieved.
The invention is further configured to: the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin in a weight ratio of 1 (0.6-0.8).
By adopting the technical scheme, the foams generated by the triterpenoid saponin are small and stable; sodium dodecyl benzene sulfonate and calcium ions in the cement aqueous solution generate precipitates, and the precipitates are adsorbed on a bubble film, so that bubbles can be effectively prevented from being broken; the two are compounded, so that the air bubbles are small and more stable, and more calcium precipitates can be formed on the air bubble films in the proportion, so that the strength of the edges of the air bubbles is increased, the increase of the concrete strength is facilitated, and the influence of the air bubbles on the concrete strength is compensated to a certain extent.
The invention also aims to provide a preparation process of the environment-friendly recycled concrete, which comprises the following preparation steps: the components are mixed evenly.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the latex powder finally forms a polymer film in the mortar, so that a plurality of cracks and capillary pores are cut off, water invasion can be blocked, and the impermeability is improved;
2. the regenerated fine aggregate is modified by microbial mineralization deposition, so that gaps in the regenerated fine aggregate are filled with CaCO3 crystals, the water absorption is reduced, the strength is improved, the regenerated coarse aggregate is modified by microbial mineralization deposition to primarily fill micro gaps in the regenerated coarse aggregate, then the large gaps are tightly filled by permeation crystallization modification, and finally the regenerated fine aggregate and the regenerated coarse aggregate are subjected to hydrophobic modification, so that the gaps can be further filled, the permeability of the regenerated fine aggregate and the regenerated coarse aggregate is reduced, and meanwhile, the bonding performance between the regenerated fine aggregate and the cement slurry is improved;
3. through setting up air entraining agent, make the bubble less, and make the marginal strength in bubble hole great, help the increase of concrete strength to compensate the influence of bubble to concrete strength to a certain extent.
Detailed Description
The examples are further defined below:
the cement is made of conch brand ordinary silicate PO42.5 cement;
the fly ash is the fly ash of a first-grade power plant of Hebei Jing aviation mineral products company Limited;
the slag powder is S95, and the manufacturer is Sanan environmental protection resource Co., Ltd, Fujian province;
the latex powder is 7030EVA redispersible latex powder, and the manufacturer is gallery republic of Lanjiao industry, Inc.;
the water reducing agent is a polycarboxylic acid water reducing agent, and the manufacturer is Shandong 37075, City Brilliant novel building material science and technology company Limited;
the manufacturer of the sodium dodecyl benzene sulfonate is Shanghai Zhongzhong fine chemical industry Co., Ltd;
the triterpene saponin is prepared from Cinaena Biotech, Inc.;
bacillus pseudofirmus DSM8715, purchased from the china common collection of microorganisms;
the physical parameters of the recycled coarse aggregate and the recycled fine aggregate before modification are shown in Table a.
TABLE a physical parameters before modification of recycled coarse and fine aggregates
Example 1
The environment-friendly recycled concrete is obtained by uniformly mixing the components, and comprises the following components: 250Kg of cement, 90Kg of fly ash, 40Kg of slag powder, 690Kg of natural coarse aggregate, 350Kg of recycled coarse aggregate, 620Kg of recycled fine aggregate, 10Kg of latex powder and 200Kg of water.
The grain size of the natural coarse aggregate is 10-25mm continuous gradation, the grain size of the regenerated coarse aggregate is 5-20mm continuous gradation, and the grain size of the regenerated fine aggregate is 1-4.0mm continuous gradation.
The recycled fine aggregate and the recycled coarse aggregate are both modified by the following microorganism mineralization deposition:
a1: inoculating Bacillus pseudodurans into microorganism culture medium, culturing to obtain microorganism culture solution, mixing with mineralized culture solution to obtain a mixture with a concentration of 107Bacterial suspension per mL;
adding 850mL of water into 3g of peptone and 10g of beef extract, uniformly mixing to obtain c, adding 22.13g of CAPS into water to reach a constant volume of 150mL to obtain d, and mixing the c and the d to obtain a microbial culture solution;
adding 7.5mL of L-sodium lactate into 850mL of water to obtain a, adding 22.13g of CAPS into 150mL of water to obtain b, adding calcium hydroxide into a, uniformly mixing a and b, and adjusting the pH to 9.5-11 to obtain a mineralized culture solution with the calcium ion concentration of 9-11 g/L;
a3: adding the bacterial suspension into the regenerated fine aggregate and the regenerated coarse aggregate until the bacterial suspension does not exceed the regenerated fine aggregate and the regenerated coarse aggregate, and the submergence height of the bacterial suspension does not exceed 5mm of the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate, soaking for 17 days at 33- ℃, and then placing the aggregates in a vacuum drying oven for drying at 50 ℃.
Example 2
The difference from example 1 is that:
an environment-friendly recycled concrete, which comprises the following components: 380Kg of cement, 65Kg of fly ash, 57Kg of slag powder, 620Kg of natural coarse aggregate, 435Kg of regenerated coarse aggregate, 580Kg of regenerated fine aggregate, 25Kg of latex powder and 156Kg of water.
The recycled fine aggregate and the recycled coarse aggregate are both modified by the following microorganism mineralization deposition:
a1: inoculating Bacillus pseudodurans into microorganism culture medium, culturing to obtain microorganism culture solution, mixing with mineralized culture solution to obtain a mixture with a concentration of 108Bacterial suspension per mL;
adding 850mL of water into 3g of peptone and 10g of beef extract, uniformly mixing to obtain c, adding 22.13g of CAPS into water to reach a constant volume of 150mL to obtain d, and mixing the c and the d to obtain a microbial culture solution;
adding 7.5mL of L-sodium lactate into 850mL of water to obtain a, adding 22.13g of CAPS into 150mL of water to obtain b, adding calcium hydroxide into a, uniformly mixing a and b, and adjusting the pH to 9.5-11 to obtain a mineralized culture solution with the calcium ion concentration of 9-11 g/L;
a3: adding the bacterial suspension into the regenerated fine aggregate and the regenerated coarse aggregate until the bacterial suspension does not exceed the regenerated fine aggregate and the regenerated coarse aggregate, and the submergence height of the bacterial suspension does not exceed 5mm of the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate, soaking for 24 days at 35 ℃, and then placing the aggregates in a vacuum drying oven for drying at 55 ℃.
Example 3
The difference from example 1 is that:
an environment-friendly recycled concrete, which comprises the following components: 450Kg of cement, 30Kg of fly ash, 70Kg of slag powder, 530Kg of natural coarse aggregate, 564Kg of recycled coarse aggregate, 500Kg of recycled fine aggregate, 55Kg of latex powder and 140Kg of water.
The recycled fine aggregate and the recycled coarse aggregate are both modified by the following microorganism mineralization deposition:
a1: inoculating Bacillus pseudodurans into microorganism culture medium, culturing to obtain microorganism culture solution, mixing with mineralized culture solution to obtain a mixture with a concentration of 109Bacterial suspension per mL;
adding 850mL of water into 3g of peptone and 10g of beef extract, uniformly mixing to obtain c, adding 22.13g of CAPS into water to reach a constant volume of 150mL to obtain d, and mixing the c and the d to obtain a microbial culture solution;
adding 7.5mL of L-sodium lactate into 850mL of water to obtain a, adding 22.13g of CAPS into 150mL of water to obtain b, adding calcium hydroxide into a, uniformly mixing a and b, and adjusting the pH to 9.5-11 to obtain a mineralized culture solution with the calcium ion concentration of 9-11 g/L;
a3: adding the bacterial suspension into the regenerated fine aggregate and the regenerated coarse aggregate until the bacterial suspension does not exceed the regenerated fine aggregate and the regenerated coarse aggregate, and the submergence height of the bacterial suspension does not exceed 5mm of the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate, soaking for 25 days at 38 ℃, and then placing the aggregates in a vacuum drying oven for drying at 60 ℃.
Example 4
The difference from example 2 is that:
the mineralized and deposited modified recycled coarse aggregate is further modified by infiltration crystallization:
b1: adding supersaturated calcium hydroxide solution into the regenerated coarse aggregate until the bacteria solution is 0-5mm above the surface of the regenerated coarse aggregate, and soaking for 24 hours;
b2: the deep penetration crystallization sealing waterproof agent was uniformly applied to the surface of the recycled coarse aggregate obtained in B1, and left to stand for 22 days.
Example 5
The difference from example 2 is that:
the mineralized and deposited modified recycled coarse aggregate is further modified by infiltration crystallization:
b1: adding supersaturated calcium hydroxide solution into the regenerated coarse aggregate until the bacteria solution is 0-5mm above the surface of the regenerated coarse aggregate, and soaking for 30 hours;
b2: the deep penetration crystallization sealing waterproof agent is evenly coated on the surface of the recycled coarse aggregate obtained from B1 and is placed for 30 days.
Example 6
The difference from example 2 is that:
the mineralized and deposited modified recycled coarse aggregate is further modified by infiltration crystallization:
b1: adding supersaturated calcium hydroxide solution into the regenerated coarse aggregate until the bacteria solution is 0-5mm above the surface of the regenerated coarse aggregate, and soaking for 48 hours;
b2: the deep penetration crystallization sealing waterproof agent was uniformly applied to the surface of the recycled coarse aggregate obtained in B1, and left to stand for 36 days.
Example 7
The difference from example 5 is that:
the recycled fine aggregate modified by mineralization deposition and the recycled coarse aggregate modified by permeation crystallization are further subjected to the following hydrophobic modification:
adding 8% of PVA solution into the mineralized deposition modified regenerated fine aggregate and the regenerated coarse aggregate modified by infiltration crystallization, enabling the PVA solution to submerge the regenerated fine aggregate and the regenerated coarse aggregate, enabling the height of the PVA solution submerging the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate to be not more than 5mm, and soaking for 20 hours under vacuum pressure.
Example 8
The difference from example 5 is that:
the recycled fine aggregate modified by mineralization deposition and the recycled coarse aggregate modified by permeation crystallization are further subjected to the following hydrophobic modification:
adding 10% PVA solution into the mineralized deposition modified regenerated fine aggregate and the permeable crystallization modified regenerated coarse aggregate, enabling the PVA solution to submerge the regenerated fine aggregate and the regenerated coarse aggregate, enabling the height of the PVA solution submerging the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate to be not more than 5mm, and soaking for 24 hours under vacuum pressure.
Example 9
The difference from example 5 is that:
the recycled fine aggregate modified by mineralization deposition and the recycled coarse aggregate modified by permeation crystallization are further subjected to the following hydrophobic modification:
adding 12% of PVA solution into the mineralized deposition modified regenerated fine aggregate and the regenerated coarse aggregate modified by infiltration crystallization, enabling the PVA solution to submerge the regenerated fine aggregate and the regenerated coarse aggregate, enabling the height of the PVA solution submerging the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate to be not more than 5mm, and soaking for 30 hours under vacuum pressure.
Example 10
The difference from example 2 is that:
also comprises 1.5Kg of water reducing agent and 0.04Kg of air entraining agent, wherein the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin with the weight ratio of 1: 0.6.
Example 11
The difference from example 2 is that:
the water reducing agent is 2.7Kg, and the air entraining agent is 0.02Kg, wherein the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin with the weight ratio of 1: 0.7.
Example 12
The difference from example 2 is that:
also comprises 4Kg of water reducing agent and 0.01Kg of air entraining agent, wherein the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin with the weight ratio of 1: 0.8.
Comparative example 1
The difference from example 11 is that:
65Kg of latex powder.
Comparative example 2
The difference from example 11 is that:
5Kg of latex powder.
Comparative example 3
The difference from example 11 is that:
the regenerated fine aggregate and the regenerated coarse aggregate are not modified by microorganism mineralization and deposition.
Comparative example 4
The regenerated coarse aggregate is firstly modified by permeation crystallization, then modified by microbial mineralization deposition and finally modified by hydrophobicity, and the modification method is the same as that of the embodiment 5.
Comparative example 5
The difference from example 11 is that:
the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin with the weight ratio of 1: 0.5.
Comparative example 6
The difference from example 11 is that:
the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin with the weight ratio of 1: 0.9.
Comparative example 7
Reference is made to a recycled concrete produced with recycled aggregate, with publication number CN 106431106B.
Performance detection
The concrete prepared in examples 1 to 6 and comparative examples 1 to 9 were subjected to test block preparation and testing by the following methods.
Making a test block according to the method of GB/T50081-2016 (Experimental method for mechanical properties of common concrete) and carrying out standard curing for 28 days, and then carrying out a compressive strength test;
testing the chloride ion penetration depth of the standard test block according to a rapid chloride ion migration coefficient method in GB/T50082-2009 test method standard for long-term performance and durability of common concrete;
testing the water seepage depth of the standard test block according to a step-by-step pressurization method in GB/T50082-2009 'test method standard for long-term performance and durability of common concrete';
the test results are shown in Table 1.
TABLE 1 concrete Property test results
As can be seen from Table 1, the compressive strength, chloride penetration depth and water penetration depth of the concrete obtained in examples 1 to 6 are superior to those of the concrete of comparative example 9, indicating that the method and the component ratio of the present application are superior.
In examples 1 to 3, the concrete obtained in example 2 was optimized in compressive strength, penetration depth of chloride ions and water penetration depth, and the composition ratios, methods and parameters of example 2 were optimized.
In examples 2 and 4 to 6, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in examples 4 to 6 are all better than those of example 2, which shows that the strength and the Karon shape of the concrete are improved by mineralizing deposition modification, in examples 4 to 6, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in example 5 are optimal, and the mineralizing deposition modification parameters of example 5 are optimal.
In examples 5 and 7-9, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in examples 7-9 are all better than those of example 5, which shows that the mineralized deposition modification improves the strength and the Karon shape of the concrete, and in examples 7-9, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in example 8 are optimal, and the hydrophobic modification parameter of example 8 is optimal.
In examples 2 and 10 to 12, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in examples 10 to 12 are all better than those of example 2, which shows that the strength and the impermeability of the concrete are improved by adding the water reducing agent and the air entraining agent, the compressive strength, the chloride ion penetration depth and the water penetration depth of the concrete obtained in example 11 are optimal in examples 10 to 12, and the adding amount and the adding proportion of the water reducing agent and the air entraining agent are optimal in example 5.
In example 11 and comparative examples 1-2, the content of latex powder in comparative example 1 is too high, the compressive strength of comparative example 1 is far lower than that in example 5, and the chloride ion penetration depth and water penetration depth of comparative example 1 are slightly better than those in example 5, which shows that the too high content of latex powder reduces the strength of concrete more, but blocks water and the like further, so that the impermeability of concrete is increased, the content of latex powder in comparative example 2 is too low, and the compressive strength of comparative example 2 changes little compared with example 5, but the chloride ion penetration depth and water penetration depth of comparative example 2 are greatly reduced, so that a film is difficult to form, and the penetration effect of concrete is poor.
In example 11 and comparative example 3, the compressive strength, chloride ion penetration depth and water penetration depth of the concrete obtained in example 5 are all better than those of comparative example 3, and the modification steps and modification sequence of the recycled fine aggregate and the recycled coarse aggregate are illustrated, so that the recycled fine aggregate and the recycled coarse aggregate have better strength and impermeability.
In example 11 and comparative examples 4 to 5, the compressive strength, chloride ion penetration depth and water penetration depth of the concrete obtained in example 5 were all superior to those of comparative examples 4 to 5, which shows that the strength and the shape of the concrete were affected by too high and too low a ratio of sodium dodecylbenzenesulfonate and triterpenoid saponin.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (8)
1. The environment-friendly recycled concrete is characterized in that: the paint comprises the following components in parts by weight: 450 parts of cement-containing material 250, 30-90 parts of fly ash, 40-70 parts of slag powder, 690 parts of natural coarse aggregate-containing material 530, 564 parts of regenerated coarse aggregate-containing material 350, 620 parts of regenerated fine aggregate-containing material 500, 10-55 parts of latex powder, 200 parts of water-containing material 140, and the regenerated coarse aggregate and the regenerated fine aggregate are modified by microbial mineralization deposition.
2. The environmentally friendly recycled concrete of claim 1, wherein: the steps of the modification of the mineralization and deposition of the microorganisms are as follows:
a1: inoculating Bacillus pseudodurans into microorganism culture medium, culturing to obtain microorganism culture solution, mixing with mineralized culture solution to obtain a mixture with a concentration of 107-109Bacterial suspension per mL;
a2: adding the bacterial suspension into the regenerated fine aggregate and the regenerated coarse aggregate until the bacterial suspension does not exceed the regenerated fine aggregate and the regenerated coarse aggregate, and the submergence height of the bacterial suspension does not exceed 5mm of the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate, soaking for 17-25 days at 33-38 ℃, and then placing the aggregates in a vacuum drying oven for drying at 50-60 ℃.
3. The environmentally friendly recycled concrete of claim 2, wherein: the mineralized and deposited modified recycled coarse aggregate is further modified by infiltration crystallization:
b1: adding supersaturated calcium hydroxide solution into the regenerated coarse aggregate until the bacteria solution is 0-5mm above the surface of the regenerated coarse aggregate, and soaking for 24-48 hours;
b2: and (3) uniformly coating the deep penetration crystallization sealing waterproof agent on the surface of the recycled coarse aggregate obtained from B1, and standing for 22-36 days.
4. The environmentally friendly recycled concrete of claim 3, wherein: the recycled fine aggregate modified by mineralization and deposition and the recycled coarse aggregate modified by permeation and crystallization are further subjected to the following hydrophobic modification:
adding 8-12% of PVA solution into the mineralized, deposited and modified regenerated fine aggregate and the regenerated coarse aggregate which is modified by permeation crystallization, enabling the PVA solution to be over the regenerated fine aggregate and the regenerated coarse aggregate, enabling the height of the PVA solution over the surfaces of the regenerated fine aggregate and the regenerated coarse aggregate to be not more than 5mm, and soaking for 20-30 hours under vacuum pressure.
5. The environmentally friendly recycled concrete of claim 1, wherein: the particle size of the natural coarse aggregate is 10-25mm continuous gradation, the particle size of the recycled coarse aggregate is 5-20mm continuous gradation, and the particle size of the recycled fine aggregate is 1-4.0mm continuous gradation.
6. The environmentally friendly recycled concrete of claim 1, wherein: according to the weight portion, the water reducing agent also comprises 1.5 to 4 portions of water reducing agent and 0.01 to 0.04 portion of air entraining agent.
7. The environmentally friendly recycled concrete of claim 6, wherein: the air entraining agent comprises sodium dodecyl benzene sulfonate and triterpenoid saponin in the weight ratio of 1 (0.6-0.8).
8. The process for preparing environment-friendly recycled concrete according to any one of claims 1 to 7, wherein: the method comprises the following steps: the components are mixed evenly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390589A (en) * | 2020-11-16 | 2021-02-23 | 北京建工资源循环利用投资有限公司 | Building garbage regeneration interlocking building block and preparation method thereof |
| CN113185229A (en) * | 2021-05-12 | 2021-07-30 | 无锡南方混凝土有限公司 | Green high-performance recycled concrete and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254241A (en) * | 2015-07-21 | 2016-01-20 | 上海城建物资有限公司 | Method for improving anti-penetrability of recycled concrete |
| CN107601941A (en) * | 2017-11-01 | 2018-01-19 | 深圳大学 | A kind of microbial augmentation regeneration aggregate and preparation method thereof |
| KR101925769B1 (en) * | 2017-08-30 | 2018-12-07 | 하나케이텍(주) | High strength concrete composition and water permeable block produced by thereof |
| CN109942255A (en) * | 2019-04-13 | 2019-06-28 | 北京国旺混凝土有限公司 | A kind of regeneration concrete and preparation method thereof |
| CN110282930A (en) * | 2019-07-10 | 2019-09-27 | 广州市建筑集团混凝土有限公司 | Regeneration concrete |
| CN110540386A (en) * | 2019-08-13 | 2019-12-06 | 温州市三箭混凝土有限公司 | Anti-crack recycled concrete and preparation method thereof |
-
2020
- 2020-07-01 CN CN202010624705.6A patent/CN111689738B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254241A (en) * | 2015-07-21 | 2016-01-20 | 上海城建物资有限公司 | Method for improving anti-penetrability of recycled concrete |
| KR101925769B1 (en) * | 2017-08-30 | 2018-12-07 | 하나케이텍(주) | High strength concrete composition and water permeable block produced by thereof |
| CN107601941A (en) * | 2017-11-01 | 2018-01-19 | 深圳大学 | A kind of microbial augmentation regeneration aggregate and preparation method thereof |
| CN109942255A (en) * | 2019-04-13 | 2019-06-28 | 北京国旺混凝土有限公司 | A kind of regeneration concrete and preparation method thereof |
| CN110282930A (en) * | 2019-07-10 | 2019-09-27 | 广州市建筑集团混凝土有限公司 | Regeneration concrete |
| CN110540386A (en) * | 2019-08-13 | 2019-12-06 | 温州市三箭混凝土有限公司 | Anti-crack recycled concrete and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390589A (en) * | 2020-11-16 | 2021-02-23 | 北京建工资源循环利用投资有限公司 | Building garbage regeneration interlocking building block and preparation method thereof |
| CN113185229A (en) * | 2021-05-12 | 2021-07-30 | 无锡南方混凝土有限公司 | Green high-performance recycled concrete and preparation method thereof |
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Application publication date: 20200922 Assignee: Zhejiang Fangyuan New Material Co., Ltd Assignor: Taizhou Siqiang new building materials Co., Ltd Contract record no.: X2021330000306 Denomination of invention: Environment friendly recycled concrete and its preparation process License type: Common License Record date: 20210929 |
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