CN115557755B - Low-calcium carbon-fixing regenerated permeable concrete and production method thereof - Google Patents
Low-calcium carbon-fixing regenerated permeable concrete and production method thereof Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses low-calcium carbon-fixing regenerated permeable concrete, which comprises the following components in parts by weight: 200-600 parts of low-calcium cement, 1000-1700 parts of recycled coarse aggregate, 0-600 parts of natural coarse aggregate, 0-200 parts of fine aggregate, 10-30 parts of additive and 90-160 parts of water. The invention can realize the high-efficiency application of low-calcium cement, recycled aggregate and the like in the pervious concrete, and the obtained pervious concrete has good mechanical property, water permeability and the like, and the related preparation method is simpler, convenient to operate and short in period, and has remarkable economic and environmental benefits.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to low-calcium carbon-fixing regenerated permeable concrete and a production method thereof.
Background
With the continuous progress of urban construction, urban building, road congestion and other current situations, the urban waterlogging is easy to cause. The permeable concrete is a novel porous and light green environment-friendly building material, has excellent water permeability and air permeability, and can prevent rainwater from accumulating water and disaster by directly penetrating into the soil at the lower layer through the gaps of the concrete, thereby having great significance for the increasingly serious rainwater management problem of cities.
Conventional cement-based pervious concrete generally employs general-purpose portland cement as a cementing material, however, general-purpose portland cement is used as a cement-based material for high energy consumption and high temperature room gas (CO 2 ) The negative effects of the discharged materials on the earth's ecological environment and climate change are increasingly evident. In the global carbon neutralization context, low-carbon environment-friendly material substitution is further soughtPortland cement has become a research hotspot and has also become a trend in how to prepare low-carbon permeable concrete. In addition, natural aggregate is short due to the long-term excessive consumption of natural aggregate in the concrete industry; at present, a large amount of construction waste is generated, and a large amount of waste concrete is mainly and directly discarded, so that the environmental problem is also increasingly serious.
The traditional Portland cement mainly comprises C 2 S,C 3 S is the main component, the ratio of calcium to silicon is relatively higher, and more CO is generated in the production process 2 And generally requires a longer curing period. In addition, the existing recycled pervious concrete has the problems of low strength, poor water permeability and the like. Patent CN110255983a discloses a recycled concrete and a preparation method thereof, and the method comprises the steps of firstly carrying out complex treatment on waste concrete to obtain aggregate and cement paste, and then carrying out high-temperature carbonization treatment to obtain recycled cement and recycled aggregate respectively for preparing the recycled concrete. Patent CN104030640a discloses a recycled aggregate water-permeable concrete and a preparation method thereof, wherein the recycled aggregate is directly added into the water-permeable concrete, and the obtained recycled aggregate is usually attached with certain cement mortar and cracks, so that the recycled aggregate has high water absorption and low elastic modulus, and is not beneficial to ensuring the application effect.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides the low-calcium carbon-fixing recycled pervious concrete, which combines the pore characteristics of the low-calcium cement and the pervious concrete, further introduces a modified recycled aggregate and a carbonization maintenance system, and can realize the high-efficiency application of the low-calcium cement, the recycled aggregate and the like in the pervious concrete; the obtained pervious concrete has good mechanical property and water permeability, and the related preparation method is simpler, convenient to operate and short in period, and has remarkable economic and environmental benefits.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the low-calcium carbon-fixing regenerated permeable concrete comprises the following components in parts by weight: 200-600 parts of low-calcium cement, 1000-1700 parts of recycled coarse aggregate, 0-600 parts of natural coarse aggregate, 0-200 parts of fine aggregate, 10-30 parts of additive and 90-160 parts of water.
In the scheme, the low-calcium cement is prepared by the method of C 3 S 2 CS and C 2 S is the main mineral phase, the sum of the mass ratio of the three mineral phases is more than or equal to 80 percent, the negative pressure screen residue of 45 mu m is less than or equal to 30 percent, and the specific surface area is more than or equal to 280m 2 /kg。
Further, in the low-calcium cement, each mineral phase and the mass percentage thereof comprise: c (C) 3 S 2 15～35％，CS15～55％，C 2 S 30～65％，C 3 S10-20%, other mineral composition includes Fe 2 O 3 、Al 2 O 3 、CaSO 4 Free CaO, free MgO, etc.; the ratio of calcium to silicon is 1.1-2.1.
In the scheme, the grain sizes of the natural aggregate and the recycled aggregate are 5-10 mm, and continuous grading is met; the content (mass percent) of the needle-shaped and flake-shaped particles is less than or equal to 5 percent, the crushing value is less than or equal to 15 percent, and the water absorption rate is less than or equal to 1.2 percent.
In the scheme, the recycled aggregate is taken from waste building concrete, crushed by a jaw crusher, and then the aggregate impurities are removed, and immersed in monoethanolamine solution for 12-24 hours.
In the scheme, the fineness modulus of the fine aggregate is 2.3-3.2, the MB value of the methylene blue is less than or equal to 1.4, the stone powder content is less than or equal to 15%, and the crushing value is less than or equal to 20%.
In the scheme, the additive is a mixed solution formed by the water reducing agent and the water-retaining thickener.
In the scheme, the additive comprises the following components in percentage by mass: 5-20% of water reducer, 0.2-1% of water retention thickener and 79-95% of water.
In the scheme, the water reducer is at least one of a polycarboxylic acid water reducer, a naphthalene water reducer, an aliphatic water reducer, a melamine water reducer and a melamine water reducer; the water reducing rate is 25-45%.
In the above scheme, the water-retaining thickener can be one or more of maltodextrin, cellulose ether and the like.
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps of:
1) Weighing the raw materials according to the proportion;
2) Premixing the weighed recycled coarse aggregate, natural coarse aggregate, fine aggregate and low-calcium cement uniformly; then adding 40-60% water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 seconds to obtain a permeable concrete mixture;
3) Vibrating and pressing the obtained permeable concrete mixture to form;
4) Placing the obtained molded blank into CO 2 And in the curing environment, carbonizing and curing to obtain the low-calcium carbon-fixing regenerated permeable concrete finished product.
In the scheme, the pressure used for compression molding is 22-28 kN, and the vibration time is 6-10 s.
In the scheme, the carbonization maintenance system is as follows: CO 2 The concentration is 20-100 vol%, the curing temperature is 20-50 ℃, the curing pressure is 0.1-1.0 MPa, and the curing time is 6-24 h.
Further, the carbonization maintenance step adopts CO 2 Industrial waste gas such as cement kiln flue gas can be used.
The principle of the invention is as follows:
the invention provides the preparation method for the permeable concrete for the first time, which takes low-calcium cement as a main cementing material and modified recycled aggregate as a main coarse aggregate, and combines a carbonization maintenance process to prepare the permeable concrete, and the comprehensive use performance of the permeable concrete is effectively considered on the premise of remarkably reducing the preparation cost:
the low-calcium cement is carbonized and maintained to generate calcium carbonate crystals and silica gel, wherein the calcium carbonate crystals are used as induction crystal nuclei to accelerate the cement carbonization process, and the calcium carbonate crystals and the silica gel are filled in the pores inside the structure to improve the performance of the obtained concrete; meanwhile, the characteristic of the porous structure of the pervious concrete is combined, so that carbonization reaction can be further effectively promoted, and further performances such as strength and the like of the concrete are effectively improved;
in addition, certain cement mortar and cracks are usually attached to the surface of the recycled aggregate obtained by mechanical crushing, so that the recycled aggregate has high water absorption rate and low elastic modulus, and the quality of the recycled aggregate is difficult to control; the invention further adopts the recycled aggregateThe monoethanolamine is modified, and the modified recycled aggregate and other components in the pervious concrete mixture are synchronously subjected to CO 2 The carbonization strengthening can effectively reduce the water absorption and crushing value of the obtained recycled aggregate, and increase the apparent density, thereby being beneficial to improving the performance of the pervious concrete; meanwhile, the recycled aggregate carbonized product calcium carbonate formed based on the formula system and the synchronous carbonization modification mechanism of the invention can be mutually meshed with low-calcium cement carbonized and hydrated products, ettringite, calcium carbonate and C-S-H gel, and the low-calcium cement paste is adhered on the recycled aggregate and CO 2 Simultaneously carrying out carbonization reaction with minerals in the low-calcium cement paste and hardened cement mortar attached to recycled aggregate to generate CaCO 3 And amorphous silica gel, and the formed carbonized products are mutually meshed to promote the mutual interweaving of the obtained crystal structures to form a whole, so that cracks of the interface transition area are filled, the property of the interface transition area is improved, and the comprehensive service performance of the pervious concrete is further improved.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the low-calcium cement is adopted to replace the traditional aluminosilicate cement to prepare the permeable concrete as the cementing material, so that the carbon emission and the energy consumption in the cement production process can be effectively reduced; further combines with carbonization maintenance technology, can obtain excellent comprehensive use performance and has obvious curing CO 2 Can also cooperatively utilize CO in industrial waste gas such as cement kiln flue gas 2 Curing the low-calcium permeable concrete to further reduce CO 2 Discharging to the outside;
2) The low-calcium carbon-fixing permeable concrete has a multi-communication hole structure, and is characterized in that CO 2 CO during curing under atmosphere 2 Can more quickly and effectively permeate into permeable concrete to accelerate CO 2 On one hand, the performance gain of the pervious concrete is remarkable; meanwhile, the hardening time of the low-calcium permeable concrete can be shortened to a certain extent, and the production period is shortened;
3) The invention utilizes the porous characteristic of the recycled aggregate, and further utilizes monoethanolamine to modify the recycled aggregate, so as to enhance the carbonization and mineralization degree of the recycled aggregate, and ensure the strength and the like of the recycled aggregate after carbonizationCan be obviously improved; in addition, the obtained modified recycled aggregate and other components in the pervious concrete are subjected to synchronous carbonization, so that carbonized products of the recycled aggregate and carbonized products such as low-calcium cement are mutually meshed, and the performance of the pervious concrete is further enhanced in a composite manner; increase solid phase area, improve mechanical property of pervious concrete, and absorb CO by dual solidification 2 。
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following examples, the low-calcium cement used was prepared as C 3 S 2 CS and C 2 S is the main mineral phase, the sum of the mass ratio of the three mineral phases is more than or equal to 80 percent, the negative pressure screen residue of 45 mu m is less than or equal to 30 percent, and the specific surface area is more than or equal to 280m 2 /kg; the common Portland cement used was PO42.5 cement.
The adopted recycled coarse aggregate is obtained by crushing self-constructed waste concrete by a jaw crusher, and is immersed in monoethanolamine solution for 24 hours, the grain size of the recycled coarse aggregate is 5-10 mm, and the recycled coarse aggregate is continuously graded; the content (mass percent) of the needle-shaped and flake-shaped particles is 1.2%, the crushing value is 11%, and the water absorption is 1.1%.
The natural coarse aggregate is provided by Hua Xin aggregate (Wu Xue) company, the lithology of the natural coarse aggregate is dolomite and limestone, the particle size of the natural coarse aggregate is 5-10 mm, the natural coarse aggregate is continuously graded, the content (mass percent) of needle-shaped and flake-shaped particles is 1.8%, the crushing value is 10%, and the saturated surface dry water absorption rate is 0.9%.
The fine aggregate is limestone and dolomite machine-made sand produced by Hua Xin aggregate (Wu Xue), the fineness modulus is 3.0, the stone powder content is 4.4%, the MB value is 0.25, the crushing value is 12%, and the water content is 1%.
Example 1
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps:
1) Weighing the raw materials according to the proportioning requirements shown in Table 1; wherein the low-calcium cement is mainly prepared from the following substances in percentage by massThe composition is as follows: c (C) 3 S 2 27％，C 2 S 33％，CS 22％，C 3 S12%, calcium-silicon ratio is 1.69, negative pressure screen residue of 45 μm is 11.2%, specific surface area is 353m 2 /kg; the maximum grain diameter of the coarse aggregate is 10mm, and the regenerated coarse aggregate and the natural coarse aggregate are uniformly mixed according to the mass of the table 1; the additive is prepared by compounding the following substances in percentage by mass: water retention thickener 0.5% (maltodextrin, produced by texas, sozhou); 89.5% of water; 10% of water reducer (polycarboxylic acid water reducer produced by western construction, the water reducing rate of which is 27% and the solid content of which is 13%);
2) Premixing the weighed aggregate (the recycled coarse aggregate, the natural coarse aggregate and the fine aggregate) and the low-calcium cement uniformly, adding 50% of water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 s; obtaining a permeable concrete mixture;
3) Vibrating the obtained permeable concrete mixture for 6s under the pressure of 24 KN;
4) Placing the obtained molded blank into CO 2 Carbonizing and curing in curing environment to obtain the final product, wherein the CO adopted in the final product 2 The curing conditions are as follows: 100% of concentration, 50 ℃ of temperature, 0.3MPa of carbonization pressure and 12 hours of carbonization time.
Example 2
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps:
1) Weighing the raw materials according to the proportioning requirements shown in Table 1; the low-calcium cement mainly comprises the following substances in percentage by mass: c (C) 3 S 2 28％，C 2 S 33％，CS 22％，C 3 S11%, calcium-silicon ratio of 1.68, negative pressure screen residue of 45 μm of 15.2%, specific surface area of 316m 2 /kg; the maximum grain diameter of the coarse aggregate is 10mm, and the regenerated coarse aggregate and the natural coarse aggregate are uniformly mixed according to the mass of the table 1; wherein the additive is prepared by compounding the following substances in percentage by mass: 10% of water reducer (naphthalene water reducer produced by Shandong Yousu chemical technology Co., ltd., water reducing rate of 30%), 0.5% of water retention thickener (maltodextrin produced by Suzhou Tejing) and 89.5% of water;
2) Premixing the weighed aggregate (the recycled coarse aggregate, the natural coarse aggregate and the fine aggregate) and the low-calcium cement uniformly, adding 50% of water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 s; obtaining a permeable concrete mixture;
3) Vibrating the obtained permeable concrete mixture for 6s under the pressure of 24 KN;
4) Placing the obtained molded blank into CO 2 Carbonizing and curing in curing environment to obtain the final product, wherein the CO adopted in the final product 2 The curing conditions are as follows: CO 2 The concentration is 100%, the temperature is 50 ℃, the carbonization pressure is 0.5MPa, and the carbonization time is 12h.
Example 3
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps:
1) Weighing the raw materials according to the proportioning requirements shown in Table 1; the low-calcium cement mainly comprises the following substances in percentage by mass: c (C) 3 S 2 19％，C 2 S 42％，CS 19％，C 3 S14%, and the calcium-silicon ratio is 1.79; negative pressure screen residue of 12.2% with 45 μm and specific surface area of 364m 2 /kg; the maximum grain diameter of the coarse aggregate is 10mm, and the regenerated coarse aggregate and the natural coarse aggregate are uniformly mixed according to the mass of the table 1; the additive is prepared by compounding the following substances in percentage by mass: 15% of water reducer (naphthalene water reducer with water reducing rate of 30% manufactured by Shandong Yousu chemical technology company); 0.5% water retention thickener (20 ten thousand viscosity hydroxypropyl methylcellulose ether produced by Shanghai ministerial chemical industry Co., ltd.); 84.5% water;
2) Premixing the weighed aggregate (the recycled coarse aggregate, the natural coarse aggregate and the fine aggregate) and the low-calcium cement uniformly, adding 50% of water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 s; obtaining a permeable concrete mixture;
3) Vibrating the obtained permeable concrete mixture for 7s under the pressure of 26 KN;
4) Placing the obtained molded blank into CO 2 Carbonizing and curing in curing environment to obtain the final product, wherein the CO adopted in the final product 2 The curing conditions are as follows: CO 2 The concentration is 100%, the temperature is 70 ℃, the carbonization pressure is 0.5MPa, and the carbonization time is 8h.
Example 4
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps:
1) Weighing the raw materials according to the proportioning requirements shown in Table 1; the low-calcium cement mainly comprises the following substances in percentage by mass: c (C) 3 S 2 22％，C 2 S 38％，CS 23％，C 3 S10%, calcium-silicon ratio is 1.70, negative pressure screen residue of 45 μm is 11.2%, specific surface area is 353m 2 /kg; the coarse aggregate is all regenerated aggregate which is soaked in monoethanolamine solution and pretreated, and the maximum particle size is 10mm; the additive is prepared by compounding the following substances in percentage by mass: 10% of water reducer (polycarboxylic acid water reducer produced by western construction, the water reducing rate of which is 25% and the solid content of which is 13%), 0.5% of water retention thickener (20 ten thousand viscosity hydroxypropyl methyl cellulose ether produced by Shanghai ministerial chemical industry Co., ltd.), and 89.5% of water;
2) Premixing the weighed aggregate (the recycled coarse aggregate, the natural coarse aggregate and the fine aggregate) and the low-calcium cement uniformly, adding 50% of water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 s; obtaining a permeable concrete mixture;
3) Vibrating the obtained permeable concrete mixture for 7s under the pressure of 25 KN;
4) Placing the obtained molded blank into CO 2 Carbonizing and curing in curing environment to obtain the final product, wherein the CO adopted in the final product 2 The curing conditions are as follows: CO 2 The concentration is 100%, the temperature is 50 ℃, the carbonization pressure is 0.3MPa, and the carbonization time is 12h.
Example 5
The preparation method of the low-calcium carbon-fixing regenerated permeable concrete comprises the following steps:
1) Weighing the raw materials according to the proportioning requirements shown in Table 1; the low-calcium cement mainly comprises the following substances in percentage by mass: c (C) 3 S 2 22％，C 2 S 42％，CS 16％，C 3 S13%, wherein the calcium-silicon ratio is 1.70%; 45 μm negative pressure screen residue 11.2%, specific surface 353m 2 /kg; the maximum grain diameter of the coarse aggregate is 10mm, and the regenerated coarse aggregate and the natural coarse aggregate are uniformly mixed according to the mass of the table 1; the additive is prepared by compounding the following substances in percentage by mass: 10 percent ofWater reducer, water retention thickener 0.5% and water 89.5%; the water reducer is a polycarboxylic acid water reducer produced in western construction, the water reducing rate is 25%, and the solid content is 13%; the water-retaining thickener is 20 ten thousand viscosity hydroxypropyl methyl cellulose ether rice produced by Shanghai ministerial chemical industry and technology limited company;
2) Premixing the weighed aggregate (the recycled coarse aggregate, the natural coarse aggregate and the fine aggregate) and the low-calcium cement uniformly, adding 50% of water, and stirring uniformly; adding the rest water and the additive, and stirring for more than 60 s; obtaining a permeable concrete mixture;
3) Vibrating the obtained permeable concrete mixture for 9s under the pressure of 23 KN;
4) Placing the obtained molded blank into CO 2 Carbonizing and curing in curing environment to obtain the final product, wherein the CO adopted in the final product 2 The curing conditions are as follows: CO 2 The concentration is 100%, the temperature is 50 ℃, the carbonization pressure is 0.3MPa, and the carbonization time is 12h.
Comparative examples 1 to 5
The raw material ratios of the pervious concrete of comparative example 1 are shown in table 1; the preparation method is almost the same as in example 1, except that all the aggregates used are natural coarse aggregates.
The raw material ratios of the pervious concrete of comparative example 2 are shown in table 1; the preparation method is almost the same as that of the example 1, except that the adopted low-calcium permeable concrete is cured for 7d in a standard curing room after being molded, the temperature is 18-22 ℃, and the relative humidity is more than 95%.
Comparative example 3 the raw material formulation ratio of the pervious concrete is shown in table 1; the preparation method is substantially the same as in example 1, except that ordinary portland cement is used instead of low-calcium cement, and curing conditions as described in example 1 are used for curing for 12h and 7d, respectively, as in example 1.
The preparation method of the water-permeable concrete raw material prepared in comparative example 4 is substantially the same as in example 1, except that the recycled aggregate used was not subjected to the soaking treatment with the monoethanolamine solution, as shown in table 1.
The raw material ratios of the pervious concrete of comparative example 5 are shown in table 1; the preparation process was substantially the same as in example 1, except that the carbonization temperature was 70 ℃.
Table 1 raw material ratios (raw material usage units kg/m) of the pervious concretes of examples 1 to 5 and comparative examples 1 to 5 3 )
The pervious concretes of examples 1 to 5 and comparative examples 1 to 5 were respectively subjected to tests of mechanical properties, water permeability and the like, and the results are shown in Table 2.
TABLE 2 Performance test results of the pervious concretes obtained in examples 1 to 5 and comparative examples 1 to 5
As can be seen from tables 1 and 2:
compared with the comparative example 1, the adopted natural coarse aggregate cannot realize the effective meshing effect between the recycled aggregate and the carbonized product, and the obtained pervious concrete has low compressive and flexural strength, poor wear resistance and less carbon fixation.
The pervious concrete of comparative example 2 was not CO 2 Curing under atmosphere, the low-calcium cement and the pretreated recycled aggregate cannot be carbonized and enhanced, and the obtained concrete test piece has very low compressive strength and flexural strength and low carbon fixation.
In the comparative example 3, ordinary silicate PO42.5 cement is taken as a cementing material, when the cement is cured for 12 hours in a carbonization environment, the involved carbonized mineralized products are fewer, the meshing effect with the recycled aggregate carbonized products is weaker, and the compression resistance, the flexural strength, the wear resistance and the like of the obtained permeable concrete are lower than those of the comparative example 1 and the example 1; after the carbonization maintenance time is further prolonged to 7 days, the mechanical property, the wear resistance and the like of the obtained concrete are still lower than those of the embodiment 1 of the invention as a whole.
The recycled aggregate used in comparative example 4 has lower carbonization and mineralization degree of adsorbing carbon dioxide in carbonization environment, and the carbonization product generated on the surface layer of the recycled aggregate has weaker meshing effect with low-calcium cement hydration and carbonization product, and meanwhile, the recycled aggregate has high water absorption and low elastic modulus, and the compression strength, flexural strength, carbon fixation amount, wear resistance and the like of the obtained pervious concrete are lower than those of the scheme adopting natural aggregate described in comparative example 1.
The carbonization temperature adopted in the comparative example 5 is higher, so that the volatilization of free water in the pervious concrete is accelerated, the amount of carbon dioxide dissolved in the water is reduced, and the carbonization and mineralization process of the recycled aggregate pervious concrete is weakened to a certain extent.
The invention adopts calcium cement and CO collected in the cement industrial production process 2 Curing and heating the concrete, improving the performance of the low-calcium carbon-fixing regenerated permeable concrete, and shortening the industrial production period; the recycled aggregate is obtained by crushing building waste or separating sand and stone separators of commercial mixing stations, so that the environmental problems of waste stacking, occupied land and the like are solved; the regenerated aggregate is soaked in monoethanolamine solution for pretreatment, and the carbon dioxide fixing and adsorbing capacity is stronger.
The above results indicate that: the calcium pervious concrete prepared in examples 1 to 5 has high compressive strength and flexural strength, good water permeability, low wear rate and high carbon fixation; the low-calcium cement and the recycled coarse aggregate with lower cost are adopted as main raw materials, and then a simple and easy-to-control carbonization maintenance process is combined, so that the obtained concrete has good mechanical property, water permeability, durability and the like, the preparation period of the water permeable concrete can be obviously shortened, and important economic and environmental benefits are achieved.
The above examples are presented for clarity of illustration only and are not limiting of the embodiments. Other variations and modifications of the above description will be apparent to those of ordinary skill in the art, and it is not necessary or exhaustive of all embodiments, and thus all obvious variations or modifications that come within the scope of the invention are desired to be protected.
Claims (7)
1. The low-calcium carbon-fixing regenerated permeable concrete is characterized by comprising the following components in parts by weight: 200-600 parts of low-calcium cement, 1000-1700 parts of recycled coarse aggregate, 0-600 parts of natural coarse aggregate, 0-200 parts of fine aggregate, 10-30 parts of additive and 90-160 parts of water;
c in the low-calcium cement 3 S 2 CS and C 2 S is the main mineral phase, the sum of the mass ratio of the three mineral phases is more than or equal to 80 percent, the negative pressure screen residue of 45 mu m is less than or equal to 30 percent, and the specific surface area is more than or equal to 280m 2 /kg；
In the low-calcium cement, each mineral phase comprises the following components in percentage by mass: c (C) 3 S 2 15~35%，CS 15~55%，C 2 S 30~65%，C 3 S10-20%; the ratio of calcium to silicon is 1.1-2.1;
the recycled coarse aggregate is obtained from waste building concrete, and is obtained by crushing the waste building concrete by a jaw crusher, removing aggregate impurities, and then soaking the waste building concrete in monoethanolamine.
2. The low-calcium carbon-fixing recycled pervious concrete according to claim 1, wherein the particle size of the natural coarse aggregate and the recycled coarse aggregate is 5-10 mm, the continuous grading is satisfied, the content of needle-shaped and sheet-shaped particles is less than or equal to 5%, the crushing value is less than or equal to 15%, and the water absorption rate is less than or equal to 1.2%; the fineness modulus of the fine aggregate is 2.3-3.2, the stone powder content is less than or equal to 15%, and the crushing value is less than or equal to 20%.
3. The low-calcium carbon-fixing recycled pervious concrete according to claim 1, wherein the additive is a mixed solution formed by a water reducing agent and a water-retaining thickener.
4. The low-calcium carbon-fixing regenerated pervious concrete according to claim 3, wherein the additive comprises the following components in percentage by mass: 5-20% of water reducer, 0.2-1% of water retention thickener and 79-95% of water.
5. The low-calcium carbon-fixing recycled pervious concrete according to claim 4, wherein the water reducing agent is at least one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an aliphatic water reducing agent, a melamine water reducing agent and a melamine water reducing agent; the water reducing rate is 25-45%; the water-retaining thickener is one or two of maltodextrin and cellulose ether.
6. The method for preparing the low-calcium carbon-fixing regenerated permeable concrete according to any one of claims 1 to 5, which is characterized by comprising the following steps:
1) Weighing the raw materials according to the proportion, wherein the raw materials comprise the following components in parts by weight: 200-600 parts of low-calcium cement, 1000-1700 parts of recycled coarse aggregate, 0-600 parts of natural coarse aggregate, 0-200 parts of fine aggregate, 10-30 parts of additive and 90-160 parts of water;
2) Premixing the weighed recycled coarse aggregate, natural coarse aggregate, fine aggregate and low-calcium cement uniformly; then adding 40-60% of water, and uniformly stirring; adding the rest water and the additive, and stirring for more than 60 seconds to obtain a permeable concrete mixture;
3) Vibrating and pressing the obtained permeable concrete mixture to form;
4) Placing the obtained molded blank into CO 2 And in the curing environment, carbonizing and curing to obtain the low-calcium carbon-fixing regenerated permeable concrete finished product.
7. The method of claim 6, wherein the carbonization maintenance regimen is: CO 2 The concentration is 20-100vol%, the curing temperature is 20-50deg.C, the curing pressure is 0.1-1.0 MPa, and the curing time is 6-24 h.
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