CN109824321B - Carbon dioxide curing prefabricated pervious concrete and preparation method thereof - Google Patents
Carbon dioxide curing prefabricated pervious concrete and preparation method thereof Download PDFInfo
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Abstract
The invention relates to carbon dioxide curing prefabricated pervious concrete and a preparation method thereof, wherein the pervious concrete comprises the following components in parts by mass: 55-80 parts of recycled aggregate, 7-30 parts of nickel slag sand, 18-40 parts of cementing material, 5-25 parts of water, 0.01-2 parts of naphthalene water reducer, 0-0.02 part of cellulose ether and 0-0.01 part of rubber for warm wheel. The cementing agent consists of the following components in parts by mass: 70-90 parts of ordinary portland cement, 5-15 parts of fly ash, 10-30 parts of steel slag, 5-15 parts of lime or white ash and 0.02-1 part of nano calcium carbonate. The method has simple process, fully utilizes the advantages of the pervious concrete structure and the properties of industrial byproducts such as nickel slag, steel slag, fly ash and the like, utilizes carbon dioxide curing to realize efficient, rapid and environment-friendly production, reduces energy consumption while obtaining a high-strength and high-durability pervious concrete product, can also effectively utilize industrial tail gas, smelting waste residue and construction waste, and has good economic benefit, environmental benefit and social benefit.
Description
Technical Field
The invention relates to carbon dioxide curing prefabricated pervious concrete and a preparation method thereof, belonging to the technical field of building material preparation.
Background
In recent years, China vigorously advances the construction of sponge cities, and permeable concrete pavement is an excellent sponge city technical method for increasing rainwater infiltration, and surface runoff conditions can be well improved.
The pervious concrete is a framework-gap structure, single-grain coarse aggregate is usually used as a framework, the strength is often low, and the problems that slurry sinks to block gaps in the construction process, water is easy to lose in the maintenance process to influence the strength to increase and the like are easy to occur. How to improve the strength and reduce the blockage is a key problem in the research of the permeable concrete preparation technology at present.
Chinese scholars have extensively studied the technology of curing and preparing concrete by carbon dioxide, the strength of the concrete product prepared by the preparation technology is increased quickly, the efficiency is higher than that of the common steam curing, and the reaction product is calcium carbonate with better crystallization, which is beneficial to the durability of the concrete. However, the technology is slowly popularized in the field of concrete preparation, and the main reason is that the preparation technology is not high enough in carbonization degree when applied to common concrete, and the alkalinity of the prepared concrete is reduced due to carbonization, so that the preparation technology is not beneficial to the formation of a reinforcing steel bar passivation film.
However, the carbon dioxide mineralization concrete preparation technology has unique advantages if applied to pervious concrete. The pervious concrete has high porosity and is easy to permeate carbon dioxide gas; the pervious concrete is easy to lose water in the curing process, but the drying is beneficial to improving the carbonization degree of carbon dioxide; the thickness of the aggregate slurry coating layer is thin, so that a higher carbonization degree can be easily achieved in a short time; pervious concrete is usually not provided with reinforcing steel bars, and the problem of low alkalinity of the concrete does not need to be considered.
Patent 201810468636.7 discloses a method for preparing carbon-fixing pervious concrete, which comprises the steps of removing dust from waste gas, mixing and stirring in the atmosphere of waste gas, molding, transferring into a carbon-fixing chamber for curing for more than 15 days, and replacing curing gas until the curing time is over. This patent proposes the concept of fixing carbon dioxide during the curing of concrete. However, in this patent, the aim is to fix carbon dioxide, not to produce pervious concrete, and the concrete mix proportion, curing system, etc. are not designed to meet the requirements of pervious concrete production, and the curing time is particularly long.
The invention utilizes the carbon dioxide curing technology to prepare the pervious concrete, solves the problems of low strength and slow strength increase of the pervious concrete, provides a high-efficiency, quick and environment-friendly pervious concrete production mode, and simultaneously, designs the mix proportion for adapting to the curing technology, reducing the energy consumption of pervious concrete products and reasonably utilizing various smelting waste residues and recycled aggregates. The invention provides an effective technical approach for reducing the emission of industrial tail gas and absorbing industrial solid wastes and construction wastes.
Disclosure of Invention
The technical problem is as follows: the invention aims to solve the technical problem of providing carbon dioxide curing precast permeable concrete and a preparation method thereof. The invention firstly solves the problems of slow strength increase, low production efficiency and uneven gap distribution of the pervious concrete, and secondly, the invention greatly utilizes smelting waste residues and recycled aggregates and consumes a large amount of carbon dioxide, thereby solving the problems of industrial tail gas emission and industrial solid waste and construction waste consumption.
The technical scheme is as follows: in order to achieve the purpose, the carbon dioxide curing precast permeable concrete and the preparation method thereof are realized by adopting the following technical scheme:
the pervious concrete comprises the following components in parts by mass: 55-80 parts of recycled aggregate, 7-30 parts of nickel slag sand, 18-40 parts of cementing material, 5-25 parts of water, 0.01-2 parts of naphthalene water reducer, 0-0.02 part of cellulose ether and 0-0.01 part of rubber for warm wheel. The cementing agent consists of the following components in parts by mass: 70-90 parts of ordinary portland cement, 5-15 parts of fly ash, 10-30 parts of steel slag, 5-15 parts of lime or white ash and 0.02-1 part of nano calcium carbonate.
The particle size of the recycled aggregate is 5-16 mm, and the recycled aggregate is broken recycled concrete aggregate.
The particle size of the nickel slag sand is 0.16-5 mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
The fly ash is either high-calcium fly ash or low-calcium fly ash, and the specific surface area is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent.
The specific surface area of the steel slag is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent, wherein the weight content of CaO is more than 20 percent.
The lime is either hydrated lime or quicklime, the weight content of CaO is more than 80%, and the fineness of a square-hole sieve with the fineness of 0.08mm is less than 18%.
The CaO content of the white ash is more than 50 percent, and the specific surface area is more than 350m2/kg。
The preparation method of the carbon dioxide curing precast pervious concrete comprises the following steps:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) metering the recycled aggregate, the nickel slag sand and 40-60% of water consumption according to a proportion, adding into a stirrer, and stirring for 0.5-1 min;
3) adding a cementing material, and stirring for 1-2 minutes;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 1-5 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box or a curing room;
6) filling carbon dioxide gas into the closed curing box or the curing room, controlling the relative humidity in the curing box or the curing room to be 40-70%, controlling the mass fraction of the carbon dioxide to be 20-100%, and curing the concrete product for 6-24 h by using the carbon dioxide;
7) and (5) demolding after curing.
Has the advantages that: compared with the prior art, the invention has the following obvious advantages:
1. the precast permeable concrete is cured by carbon dioxide, the requirements of high porosity and low alkalinity of the permeable concrete are reasonably utilized, the requirement on the pre-curing of the concrete is low, the carbonization process is more efficient, and the concrete reaches a higher carbonization degree in a shorter time, so that higher strength is obtained, and the requirement on the service of a product is met; in the process of prefabricating and preparing the pervious concrete, high-temperature steam curing required by the conventional precast concrete is not needed, a large amount of carbon dioxide is consumed, the energy consumption in the process of prefabricating and preparing the pervious concrete is greatly reduced, and a direction is provided for reducing the emission of industrial tail gas carbon dioxide.
2. The invention reasonably utilizes the advantages of the materials of each component to realize the performance complementation: the nickel slag has high iron and magnesium content and poor grindability, and is used as fine aggregate for pervious concrete, thereby being beneficial to enhancing the wear resistance of the concrete; the steel slag is hindered in concrete application due to excessive free calcium oxide, and the steel slag is used as a cementing material component, so that the high calcium content is more favorable for participating in reaction to generate calcium carbonate under the carbon dioxide curing, and simultaneously, lime is reasonably added to be used as a calcium source, so that the strength of the cementing material and the pervious concrete is further promoted to be improved; the spherical shape of the fly ash exerts the grain type effect of the fly ash, so that the workability of the freshly mixed pervious concrete is improved; the performance of the recycled aggregate is reduced because the recycled aggregate carries partial mortar, and the recycled aggregate can be directly strengthened in the curing process by adopting carbon dioxide oxidation, so that the performance of the aggregate is improved, and the increase of production procedures is avoided; the pervious concrete has high porosity and thin slurry coating layer, so that the penetration of carbon dioxide gas is greatly facilitated in the carbon dioxide curing process, the procedures of pre-curing and drying the concrete before carbon dioxide curing are greatly reduced or even do not need to be considered, and meanwhile, the pervious concrete product with high carbonization degree and high strength can be obtained in a short time.
3. The invention uses the recycled aggregate as pervious concrete coarse aggregate, and carries out water absorption treatment before mixing, so that the recycled aggregate is saturated and dry. The recycled aggregate causes more cracks on the surface in the production process and often carries mortar, which causes high water absorption of the recycled aggregate, and the pre-water absorption treatment is favorable for good workability when pervious concrete is mixed.
4. According to the invention, the naphthalene water reducing agent is matched with the cellulose ether and the welter gum, the naphthalene water reducing agent enables the concrete mixture slurry to have better fluidity, and the cellulose ether and the welter gum are matched to improve the shear strength of the concrete mixture slurry and increase the viscosity of the concrete mixture slurry, so that the pervious concrete aggregate has uniform slurry hanging thickness and is difficult to flow, and the problem of sinking of the pervious concrete slurry is avoided.
5. The cementing material used in the invention adopts nano calcium carbonate, so that the interfacial energy of calcium carbonate precipitation in the reaction process is reduced in the carbon dioxide curing process, a nucleation site is provided for a carbonization reaction product, the carbonization process of concrete is greatly accelerated, and the strength of pervious concrete is improved.
Detailed Description
The invention relates to a carbon dioxide curing precast pervious concrete prepared from nickel slag, steel slag and recycled aggregate, which comprises the following components in parts by mass: 55-80 parts of recycled aggregate, 7-30 parts of nickel slag sand, 18-40 parts of cementing material, 5-25 parts of water, 0.01-2 parts of naphthalene water reducer, 0-0.02 part of cellulose ether and 0-0.01 part of rubber for warm wheel. The cementing agent consists of the following components in parts by mass: 70-90 parts of ordinary portland cement, 5-15 parts of fly ash, 10-30 parts of steel slag, 5-15 parts of lime or white ash and 0.02-1 part of nano calcium carbonate.
The particle size of the recycled aggregate is 5-16 mm, and the recycled aggregate is broken recycled concrete aggregate.
The particle size of the nickel slag sand is 0.16-5 mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
The fly ash is either high-calcium fly ash or low-calcium fly ash, and the specific surface area is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent.
The specific surface area of the steel slag is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent, wherein the weight content of CaO is more than 20 percent.
The lime is either hydrated lime or quicklime, the weight content of CaO is more than 80%, and the fineness of a square-hole sieve with the fineness of 0.08mm is less than 18%.
The CaO content of the white ash is more than 50 percent, and the specific surface area is more than 350m2/kg。
The preparation method of the carbon dioxide curing precast pervious concrete comprises the following steps:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) metering the recycled aggregate, the nickel slag sand and 40-60% of water consumption according to a proportion, adding into a stirrer, and stirring for 0.5-1 min;
3) adding a cementing material, and stirring for 1-2 minutes;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 1-5 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box or a curing room;
6) filling carbon dioxide gas into the closed curing box or the curing room, controlling the relative humidity in the curing box or the curing room to be 40-70%, controlling the mass fraction of the carbon dioxide to be 20-100%, and curing the concrete product for 6-24 h by using the carbon dioxide;
7) and (5) demolding after curing.
The first embodiment,
The precast pervious concrete cured by carbon dioxide comprises the following components in parts by mass: 60 parts of recycled concrete aggregate, 30 parts of nickel slag sand, 14 parts of ordinary portland cement, 2 parts of fly ash, 4 parts of steel slag, 1.2 parts of lime, 0.1 part of nano calcium carbonate, 6 parts of water, 0.4 part of naphthalene water reducer, 0.003 part of cellulose ether and 0.001 part of rubber cement.
The preparation method of the carbon dioxide curing precast permeable concrete prepared by using the nickel slag, the steel slag and the recycled aggregate comprises the following steps:
comprises the following steps:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) weighing the recycled aggregate, the nickel slag sand and 40 percent of water consumption according to the proportion, adding the recycled aggregate, the nickel slag sand and the water consumption into a stirrer, and stirring for 0.5 minute;
3) adding cementing agent and stirring for 1 minute;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 2 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box;
6) controlling the relative humidity in the curing box to be 70 percent and the mass fraction of carbon dioxide to be 95 percent, and curing for 6 hours;
7) and (5) demolding after curing.
Example II,
The carbon dioxide curing precast permeable concrete prepared by using the nickel slag, the steel slag and the recycled aggregate comprises the following components in parts by mass: 70 parts of recycled concrete aggregate, 20 parts of nickel slag sand, 24 parts of ordinary portland cement, 1.5 parts of fly ash, 4.5 parts of steel slag, 1 part of lime, 0.14 part of nano calcium carbonate, 10 parts of water, 0.55 part of naphthalene water reducer, 0.005 part of cellulose ether and 0.002 part of rubber for a roller.
The preparation method of the carbon dioxide curing precast permeable concrete prepared by using the nickel slag, the steel slag and the recycled aggregate comprises the following steps:
comprises the following steps:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) weighing the recycled aggregate, the nickel slag sand and 50 percent of water consumption according to the proportion, adding into a stirrer, and stirring for 1 minute;
3) adding cementing agent and stirring for 2 minutes;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 2 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box;
6) controlling the relative humidity in the curing box to be 60 percent and the mass fraction of carbon dioxide to be 60 percent, and curing for 10 hours;
7) and (5) demolding after curing.
Example III,
The carbon dioxide curing precast permeable concrete prepared by using the nickel slag, the steel slag and the recycled aggregate comprises the following components in parts by mass: 80 parts of recycled concrete aggregate, 10 parts of nickel slag sand, 35 parts of ordinary portland cement, 2 parts of fly ash, 4 parts of steel slag, 0.8 part of lime, 0.25 part of nano calcium carbonate, 12 parts of water, 0.72 part of naphthalene water reducer, 0.007 part of cellulose ether and 0.004 part of rubber for warm wheel.
The preparation method of the carbon dioxide curing precast permeable concrete prepared by using the nickel slag, the steel slag and the recycled aggregate comprises the following steps:
comprises the following steps:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) weighing the recycled aggregate, the nickel slag sand and 60 percent of water consumption according to the proportion, adding the materials into a stirrer, and stirring for 1 minute;
3) adding cementing agent and stirring for 2 minutes;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 3 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box;
6) controlling the relative humidity in the curing box to be 50 percent and the mass fraction of carbon dioxide to be 40 percent, and curing for 20 hours;
7) and (5) demolding after curing.
Table 1 shows performance assessment indexes of the invention, which are executed with reference to CJJ/T135-2009 technical Specification for pervious cement concrete pavements, GB/T12988 test method for wear resistance of inorganic ground materials, and GB/T50082 test method for long-term performance and durability of ordinary concrete. As can be seen from Table 1, the pervious concrete prepared by the invention has high strength, good wear resistance, good durability and good water permeability.
TABLE 1
When the prefabricated permeable concrete product is prepared, the mold can be changed according to actual needs to prepare permeable concrete bricks, plates and the like in various forms, on-site mixing, paving, vibrating and curing are not needed, and the production efficiency of paving the permeable concrete pavement is greatly accelerated.
The preparation method provided by the invention does not adopt high-energy-consumption curing forms such as high temperature and high pressure and the like in the preparation process, but adopts carbon dioxide curing, so that the energy consumption and the production cost in the curing process are reduced, and compared with the traditional pervious concrete production mode of mixing and spreading on site, the preparation production mode provided by the invention greatly accelerates the strength increase of pervious concrete products and shortens the production period.
The cementing materials used in the preparation process are inorganic cementing materials, and do not contain organic synthetic cementing materials, so that no peculiar smell is generated in the production process; meanwhile, a large amount of various smelting waste residues, fly ash, recycled aggregate and carbon dioxide are used, and a large amount of industrial solid wastes, construction wastes and industrial tail gas are consumed, so that the road pavement material is a new-generation road pavement material which is environment-friendly and sustainable.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various modifications and improvements without departing from the principle of the present invention, and such modifications and improvements are also within the scope of the present invention.
Claims (6)
1. The carbon dioxide curing precast pervious concrete is characterized by comprising the following components in parts by mass: 55-80 parts of recycled aggregate, 7-30 parts of nickel slag sand, 18-40 parts of cementing material, 5-25 parts of water, 0.01-2 parts of naphthalene water reducer, 0-0.02 part of cellulose ether and 0-0.01 part of rubber for warm wheel; the cementing agent consists of the following components in parts by mass: 70 to 90 parts of ordinary portland cement, 5 to 15 parts of fly ash, 10 to 30 parts of steel slag, 5 to 15 parts of lime or white ash, 0.02 to 1 part of nano calcium carbonate,
the particle size of the recycled aggregate is between 5 and 16mm, the recycled aggregate is crushed recycled concrete aggregate,
the particle size of the nickel slag sand is 0.16-5 mm, and the nickel slag sand is air-cooled or water-quenched nickel slag.
2. The carbon dioxide curing precast pervious concrete as claimed in claim 1, characterized in that the fly ash is high calcium fly ash or low calcium fly ash, and the specific surface area is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent.
3. The carbon dioxide cured precast pervious concrete of claim 1, characterized in that the specific surface area of the steel slag is more than 350m2Per kg, CaO and SiO2The sum of the weight contents is more than 50 percent, wherein the weight content of CaO is more than 20 percent.
4. The carbon dioxide curing precast pervious concrete as claimed in claim 1, characterized in that the lime is hydrated lime or quicklime, the CaO content thereof is more than 80% by weight and the fineness thereof is less than 18% by weight on a 0.08mm square mesh sieve.
5. The carbon dioxide cured precast permeable concrete according to claim 1, characterized in that the CaO content of the white ash is more than 50% by weight, and the specific surface area is more than 350m2/kg。
6. A method for preparing the carbon dioxide cured precast pervious concrete as claimed in claim 1, 2, 3, 4 or 5, characterized in that the method comprises the steps of:
1) the recycled aggregate absorbs water until the saturated surface is dry;
2) metering the recycled aggregate, the nickel slag sand and 40-60% of water consumption according to a proportion, adding into a stirrer, and stirring for 0.5-1 min;
3) adding a cementing material, and stirring for 1-2 minutes;
4) adding the residual water consumption, the water reducing agent, the cellulose ether and the rubber for the warm wheel, and stirring for 1-5 minutes;
5) pouring the concrete obtained in the step 3) into a mould, compacting the concrete in a layering manner by using a low-frequency flat plate vibrator, and transferring the concrete with the mould into a closed curing box or a curing room;
6) filling carbon dioxide gas into the closed curing box or the curing room, controlling the relative humidity in the curing box or the curing room to be 40-70%, controlling the mass fraction of the carbon dioxide to be 20-100%, and curing the concrete product for 6-24 h by using the carbon dioxide;
7) and (5) demolding after curing.
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| CN110409255A (en) * | 2019-07-22 | 2019-11-05 | 广东天濠建设工程有限公司 | Town road and constructing operation method |
| CN112079583A (en) * | 2020-08-26 | 2020-12-15 | 武汉理工大学 | Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof |
| CN112897966B (en) * | 2021-02-04 | 2022-07-12 | 武汉理工大学 | Calcium carbonate-based inorganic coating and preparation and use methods thereof |
| CN113307582B (en) * | 2021-07-01 | 2022-05-06 | 石家庄铁道大学 | Preparation method of carbon capture concrete containing SAP (super absorbent Polymer) net structure |
| CN114474359B (en) * | 2022-03-24 | 2023-10-20 | 淮阴工学院 | Preparation method of precast concrete member |
| CN115536432B (en) * | 2022-08-26 | 2023-09-29 | 中交第二航务工程局有限公司 | Carbon dioxide mineralization maintenance method for concrete prefabricated part |
| CN115321890A (en) * | 2022-08-30 | 2022-11-11 | 霖和气候科技(北京)有限公司 | Solid waste base binder for carbon dioxide sequestration, preparation method and carbon dioxide sequestration method thereof |
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