CN115321904A - Low-carbon plant-growing concrete and preparation method thereof - Google Patents
Low-carbon plant-growing concrete and preparation 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
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- B28B11/245—Curing concrete articles
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B14/28—Carbonates of calcium
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- C04B2111/00017—Aspects relating to the protection of the environment
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses low-carbon plant-growing concrete which comprises the following components in parts by weight: 15 to 30 portions of low-calcium carbonized cement, 2 to 6 portions of limestone powder, 90 to 160 portions of coarse aggregate, 0.1 to 0.8 portion of additive and 4 to 10 portions of water; the material is obtained by mixing the raw materials according to the requirements and carrying out carbonization reaction. The low-carbon plant-growing concrete can effectively give consideration to the advantages of low alkalinity, high strength, good durability and the like; can provide a proper low-alkaline environment for plant growth and can effectively prolong the service life of a concrete structure; at the same time, the carbonization curing is utilized to absorb CO 2 Reducing the carbon footprint of the plant-growing concrete; and the related preparation method is simple, has obvious cost and environmental benefits, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of ecological concrete, and particularly relates to low-carbon plant-growing concrete and a preparation method thereof.
Background
The plant growth concrete is a porous concrete material with certain pore size and porosity, the concrete pores are filled with nutrient substances meeting the requirements of plant growth, plants grow on the surface of the concrete, and root systems penetrate through the pores in the concrete to form a plant-skeleton-soil organic combination. The plant-growing concrete has the characteristic of the structural functionality of pervious concrete, has the characteristic of the growth performance of plant organisms, becomes a hotspot of concrete research at present in the process of vigorously advocating the construction of sponge cities, and is applied to landscape projects such as wetland greening, river bank protection, community greening, parking lots and the like.
At present, domestic research mainly focuses on reducing the internal alkalinity of plant-growing concrete to meet the problem of normal plant growth (pH is less than or equal to 9.5). The conventional alkali-reducing measures mainly comprise the steps of doping mineral admixture and alkaline neutralizer into concrete, selecting neutral cementing material, surface treatment, carbonizing alkali-reducing and the like. However, the existing alkali-reducing technology generally has adverse effects on the strength and durability of concrete, thereby reducing the service life of vegetation. The literature 'alkali reduction technology and planting effect research of plant-growing concrete' proposes that the alkalinity of the plant-growing concrete is reduced by adopting accelerated carbonization, the pH value of the surface layer of the obtained plant-growing concrete is less than 8.2, and the strength of the plant-growing concrete is equivalent to that of the plant-growing concrete which is not carbonized. However, the carbonization alkali-reduction method proposed in the article selects ordinary portland cement, the carbonization reaction degree is limited, and long-time accelerated carbonization (more than or equal to 30 d) is needed to neutralize the alkaline hydration product Ca (OH) 2 And the construction difficulty and the maintenance cost are increased. In addition, the carbonization curing of ordinary portland cement can only reduce the pH and CO of the concrete surface layer 2 The alkalinity inside the concrete is still high due to the difficulty in permeating into the concrete, and the alkalinity can still be increased due to the continuous hydration of the cement at the later stage.
Global warming has become a significant problem for humans, CO 2 The greenhouse effect is an important cause of global environmental problems. In the era background of the two-carbon policy, the cement industry as carbon emissionsIn high-volume industries, carbon reduction transformation is required. Therefore, a series of novel green low-carbon building materials are urgently needed to be developed, the carbon emission footprint of the materials is reduced on the basis of meeting the performance requirements of building material products, and the sustainable development of the cement building material industry is promoted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention mainly aims to provide the low-carbon plant-growing concrete which can effectively give consideration to the properties of low alkalinity, high strength, good durability and the like; not only can provide a proper low-alkaline environment for plant growth, but also can effectively prolong the service life of a concrete structure; at the same time, the CO is absorbed by carbonization and maintenance 2 Reducing the carbon footprint of the plant-growing concrete; and the related preparation method is simple and is suitable for popularization and application.
In order to achieve the purpose, the invention adopts the technical scheme that:
the low-carbon plant-growing concrete comprises the following components in parts by weight: 15 to 30 portions of low calcium carbonized cement, 2 to 6 portions of limestone powder, 90 to 160 portions of coarse aggregate, 0.1 to 0.8 portion of admixture and 4 to 10 portions of water.
Preferably, the low-carbon plant-growing concrete comprises the following components in parts by weight: 20 to 30 portions of low-calcium carbonized cement, 3 to 6 portions of limestone powder, 110 to 150 portions of coarse aggregate, 0.2 to 0.7 portion of additive and 5 to 9 portions of water.
In the above scheme, the chemical composition and the mass percentage of the low-calcium carbonized cement comprise: c 3 S 2 45-80%, CS 15-55%, solid solution phase 0-5%; the specific surface area is 450-600 kg/cm 2 。
Preferably, the low-calcium carbonized cement comprises the following chemical components in percentage by mass: c 3 S 2 55-70%, CS 30-45%, and solid solution phase 0-3%.
In the scheme, the content of calcium carbonate in the limestone powder is more than or equal to 60 percent, and the specific surface area is more than or equal to 300kg/cm 2 。
In the scheme, the coarse aggregate is 9.5-31.5 mm of gravel.
In the scheme, the additive is a water reducing agent, and the water reducing rate is 10-25%.
Further, the water reducing agent can be selected from a polycarboxylic acid water reducing agent and the like.
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Preparation of plant growing concrete
Uniformly stirring low-calcium carbonized cement, limestone powder, water and 1/2-3/4 of the additive to obtain slurry; then adding the coarse aggregate and the residual admixture, and continuously stirring uniformly to obtain a fresh plant-growing concrete mixture;
2) Plant growing concrete forming
Injecting the obtained freshly mixed plant raw concrete mixture into a mold twice, injecting the mixture with the dosage of 1/3-1/2 for the first time, and compacting after uniform tamping; injecting the residual mixture for the second time, compacting after uniform tamping, moving the mixture into a carbonization box with a mold for carbonization and maintenance, and demolding to obtain a plant-growing concrete product;
3) Carbonization reaction of plant-growing concrete
And putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization reaction to obtain the low-carbon plant-growing concrete.
In the scheme, the belt mold maintenance system in the step 2) is as follows: the carbonization time is 1 to 6 hours, the carbonization temperature is 20 to 30 ℃, and CO is 2 The concentration is 20-30 vol%, and the pressure is normal pressure.
In the above scheme, the carbonization reaction system in step 3) is: the carbonization time is 6 to 18 hours, the carbonization temperature is 50 to 80 ℃, and CO is 2 The concentration is 50-100 vol%, and the pressure is 0.5-1.5 MPa.
According to the low-carbon plant-growing concrete prepared by the scheme, the pH value after carbonization is less than or equal to 9.0, the pH value of 28d is less than or equal to 8.5, the compressive strength is greater than or equal to 18MPa, the flexural strength is greater than or equal to 1.8MPa, the porosity is greater than or equal to 24%, and the single-component plant-growing concrete CO is prepared 2 The absorption capacity is more than or equal to 50kg; the obtained concrete has better mechanical property, can obviously reduce the alkalinity of the concrete, and can effectively keep the subsequent alkalinity stable.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention carbonizes with low calciumCement and limestone powder as main material for preparing low carbon plant concrete, and low calcium carbonized cement C 3 S 2 The main carbonization active phases such as CS and the like are combined with the action of inducing the nucleation of the carbonization reaction product calcium carbonate (providing crystal growth 'ore bed' for the main product calcium carbonate of the carbonization reaction and accelerating the carbonization reaction process) to effectively solidify alkali components and mineral phases in the concrete, remarkably reduce the pH value of the concrete after carbonization while obtaining the mechanical property, keep the stable low pH value state in the later period, realize the synergistic improvement of the mechanical property and the alkali reduction effect and provide a proper low-alkaline environment for the plant growth.
2) The invention takes the low-calcium carbonized cement with no hydration activity as a main cementing material, further combines a step-by-step carbonization process, and firstly absorbs carbon dioxide to quickly improve the strength and obviously shorten the demoulding period of the concrete by a mould carbonization curing means, thereby improving the production efficiency. Meanwhile, in the process of curing with the mold, the adopted low-pressure low-concentration carbon dioxide continuously permeates into the center of the plant-growing concrete product to react with calcium ions and water to generate carbonized products of calcium carbonate and silica gel, and the internal pores are gradually opened, so that the diffusion and dissolution of the carbon dioxide are facilitated, the subsequent carbonization reaction of high-pressure high-concentration carbon dioxide is further promoted, and the reaction degree of secondary carbonization of concrete is improved. And further obtaining the low-carbon plant-growing concrete with the advantages of low alkalinity, high strength, good durability and the like.
3) The low-calcium carbonized cement adopted by the invention has low clinker coefficient and low calcination temperature, and can greatly reduce CO 2 Emission and energy consumption, and the prepared concrete product can further absorb CO when carbonized and maintained 2 And the double carbon reduction is realized, and the low-carbon benefit and the economic benefit are good.
4) The preparation process of the plant-growing concrete is simple and efficient, and the production cost is low; after the product is carbonized and cured step by step, the strength can be quickly obtained, the alkalinity of concrete can be reduced, and the construction efficiency of slope protection, greening and the like can be greatly improved.
Detailed Description
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
In the following examples, the low calcium carbonated cement is used as high purity limestone (CaCO) 3 Content is more than or equal to 95wt percent) and quartz powder (SiO) 2 The content is more than or equal to 95wt percent) is taken as a raw material, the raw material is mixed, homogenized, pressed, calcined (the temperature is 1280-1400 ℃, the time is 3-6 h) according to the designed Ca/Si ratio, and the specific surface area of the product prepared by grinding is controlled to be 520kg/cm 2 (ii) a CaCO in limestone powder 3 The content is 70wt%, and the specific surface area is 350kg/cm 2 (ii) a The coarse aggregate is basalt broken stone with the grain diameter of 10-25 mm; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 20%.
Example 1
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 18 parts of low-calcium carbonized cement, 4 parts of limestone powder, 105 parts of coarse aggregate, 0.4 part of water reducing agent and 8.7 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 45%, CS 50%, and 5% solid solution phase;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and 3/4 of the amount of the water reducing agent to obtain slurry, adding the coarse aggregate and the rest amount of the water reducing agent, and continuously stirring uniformly to obtain a fresh plant-growing concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the rest mixture for the second time, compacting after uniform tamping, transferring into carbonization curing box, and introducing into CO curing box at 20 deg.C 2 Carbonizing and curing the concrete product with a mold for 3 hours under the conditions of concentration of 20vol% and normal pressure, and demolding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Carbonizing in a carbonization reactor at 50 deg.C with CO 2 The concentration is 60vol%, the pressure is 0.5MPa, and the carbonization time is 8h; and obtaining the low-carbon plant-growing concrete.
Example 2
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 21 parts of low-calcium carbonized cement, 6 parts of limestone powder, 140 parts of coarse aggregate, 0.4 part of water reducing agent and 7.5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 50%, CS 47%, and 3% solid solution phase;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the rest mixture for the second time, compacting after uniform tamping, transferring into carbonization curing box, and introducing into a carbonization curing box at 30 deg.C and CO 2 Carbonizing and curing for 4 hours with a mold under the conditions of concentration of 20vol% and normal pressure, and demolding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled to be 50 ℃, and CO is controlled 2 The concentration is 80vol%, the pressure is 0.8MPa, and the carbonization time is 12h; and obtaining the low-carbon plant-growing concrete.
Example 3
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 23 parts of low-calcium carbonized cement, 4 parts of limestone powder and coarse145 parts of aggregate and 6 parts of water, 0.4 part of water reducing agent; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 63%, CS 35%, solid solution phase 2%;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the rest mixture for the second time, uniformly tamping, compacting, transferring into carbonization curing box, and introducing into CO at 20 deg.C 2 Carbonizing and curing for 4 hours with a mold under the conditions of the concentration of 25vol% and normal pressure, and demolding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled at 70 ℃, and CO is controlled 2 The concentration is 100vol%, the pressure is 1.3MPa, and the carbonization time is 16h; and obtaining the low-carbon plant-growing concrete.
Example 4
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 20 parts of low-calcium carbonized cement, 4 parts of limestone powder, 130 parts of coarse aggregate, 0.4 part of water reducing agent and 5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 63%, CS 35%, solid solution phase 2%;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture in the first time, and uniformly tampingThen compacting is carried out; and injecting the residual mixture for the second time, and compacting after uniform tamping. Transferring into carbonization curing box, and treating with CO at 25 deg.C 2 Carbonizing and curing for 4 hours with a mould under the conditions of the concentration of 30vol% and normal pressure, and demoulding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled at 70 ℃, and CO is controlled 2 The concentration is 95vol%, the pressure is 1.0MPa, and the carbonization time is 12h; and obtaining the low-carbon plant-growing concrete.
Example 5
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 28 parts of low-calcium carbonized cement, 3 parts of limestone powder, 145 parts of coarse aggregate, 0.5 part of water reducing agent and 7.5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 63%, CS 35%, solid solution phase 2%;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the rest mixture for the second time, uniformly tamping, compacting, transferring into carbonization curing box, and introducing into CO at 30 deg.C 2 Carbonizing and curing for 4 hours with a mould under the conditions of the concentration of 30vol% and normal pressure, and demoulding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled at 80 ℃, and CO is controlled 2 The concentration is 99%, the pressure is 1.4MPa, and the carbonization time is 14h, thus obtaining the low-carbon plant-growing concrete.
Comparative example 1
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 28 parts of low-calcium carbonized cement, 3 parts of limestone powder, 145 parts of coarse aggregate, 0.5 part of water reducing agent and 7.5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 30%, CS 65%, and 5% solid solution phase;
2) The green concrete formulation, shaping and curing by carbonization are exactly the same as in example 5 and will not be described again.
Comparative example 2
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 25 parts of low-calcium carbonized cement, 3 parts of PO42.5 cement, 2 parts of limestone powder, 155 parts of coarse aggregate, 0.5 part of water reducing agent and 7.5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 63%, CS 35%, and a solid solution phase 2%;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the residual mixture for the second time, compacting after uniform tamping, demoulding after 24 hours, and transferring into a carbonization reaction kettle for carbonization;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled at 80 ℃, and CO is controlled 2 The concentration is 99%, the pressure is 1.4MPa, and the carbonization time is 14h, thus obtaining the low-carbon plant-growing concrete.
Comparative example 3
The preparation method of the plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 28 parts of PO42.5 cement, 3 parts of limestone powder, 145 parts of coarse aggregate, 0.5 part of water reducing agent and 7.5 parts of water;
2) The preparation, forming and carbonization curing of the plant-growing concrete are exactly the same as in comparative example 2, and the description thereof is not repeated.
Comparative example 4
The preparation method of the low-carbon plant-growing concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the weight portions thereof are as follows: 28 parts of low-calcium carbonized cement, 3 parts of limestone powder, 145 parts of coarse aggregate, 0.5 part of water reducing agent and 7.5 parts of water; wherein, the low-calcium carbonized cement comprises the following components: c 3 S 2 63%, CS 35%, solid solution phase 2%;
2) Preparation of plant-growing concrete mixture
Uniformly stirring the weighed low-calcium carbonized cement, limestone powder, water and a 3/4 dosage of water reducing agent to obtain slurry, adding the coarse aggregate and the residual dosage of water reducing agent, and continuously stirring uniformly to obtain a fresh plant concrete mixture;
3) Plant growing concrete forming
Injecting the freshly mixed plant raw concrete mixture obtained in the step 2) into a mold twice, injecting half of the mixture for the first time, and compacting after uniform tamping; injecting the rest mixture for the second time, uniformly tamping, compacting, transferring into carbonization curing box, and introducing into CO at 30 deg.C 2 Carbonizing and curing the concrete product with the mould for 10 hours under the conditions of the concentration of 30vol% and normal pressure, and demoulding to obtain a plant-growing concrete product;
4) Carbonization and maintenance of plant-growing concrete
Putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization, wherein the carbonization temperature is controlled at 80 ℃, and CO is controlled 2 The concentration is 99%, the pressure is 1.4MPa, and the carbonization time is 14h, so that the low-carbon plant-growing concrete is obtained.
The green concrete obtained in examples 1 to 5 and comparative examples 1 to 4 were subjected to performance tests of mechanical properties, basicity, porosity, and the like, and the results are shown in table 1, respectively.
TABLE 1 Performance test results of the low-carbon plant-growing concretes obtained in examples 1 to 5 and comparative examples 1 to 4
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The low-carbon plant-growing concrete is characterized by comprising the following components in parts by weight: 15 to 30 portions of low calcium carbonized cement, 2 to 6 portions of limestone powder, 90 to 160 portions of coarse aggregate, 0.1 to 0.8 portion of additive and 4 to 10 portions of water.
2. The low-carbon plant-growing concrete of claim 1, wherein the low-calcium carbonized cement comprises the following chemical components in percentage by mass: c 3 S 2 45-80%, CS 15-55%, solid solution phase 0-5%; the specific surface area is 450-600 kg/cm 2 。
3. The low-carbon plant-growing concrete according to claim 1, wherein the calcium carbonate content in the limestone powder is not less than 60%, and the specific surface area is not less than 300kg/cm 2 。
4. The low-carbon vegetation concrete according to claim 1, wherein the coarse aggregate is 9.5 to 31.5mm crushed stone.
5. The low-carbon vegetation concrete according to claim 1, wherein the admixture is a water reducing agent, and the water reducing rate is 10-25%.
6. The method for preparing the low-carbon plant-growing concrete of any one of claims 1 to 5, which is characterized by comprising the following steps of:
1) Preparation of plant growing concrete
Uniformly stirring the low-calcium carbonized cement, the limestone powder, the water and part of the additive according to the proportion to obtain slurry; then adding the coarse aggregate and the residual amount of the additive, and continuously stirring uniformly to obtain a freshly-mixed plant-growing concrete mixture;
2) Plant growing concrete forming
Injecting the obtained freshly-mixed plant raw concrete mixture into a mold twice, injecting part of the mixture for the first time, uniformly tamping, and compacting; injecting the mixture with the residual amount for the second time, compacting after uniform tamping, moving into a carbonization box for carbonization and maintenance with a mold, and demolding to obtain a plant-growing concrete product;
3) Carbonization and maintenance of plant-growing concrete
And putting the obtained plant-growing concrete product into a carbonization reaction kettle for carbonization reaction to obtain the low-carbon plant-growing concrete.
7. The preparation method according to claim 6, wherein the carbonization curing system with the mold adopted in the step 2) is as follows: the carbonization time is 1 to 6 hours, the carbonization temperature is 20 to 30 ℃, and CO is 2 The concentration is 20-30 vol%, and the pressure is normal pressure.
8. The method according to claim 6, wherein the carbonization reaction system used in step 3) is: the carbonization time is 6 to 18 hours, the carbonization temperature is 50 to 80 ℃, and CO is 2 The concentration is 50-100 vol% and the pressure is 0.5-1.5 MPa.
9. The method of claim 6, wherein the admixture is added in an amount of 1/2 to 3/4 in the step 1).
10. The method of claim 6 wherein the admixture is added in step 2) in an amount of 1/3 to 1/2.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120152152A1 (en) * | 2010-12-21 | 2012-06-21 | Ruentex Engineering & Construction Co., Ltd. | Low calcium cementitious material and method of manufacturing low calcium cement |
| CN105347706A (en) * | 2015-10-29 | 2016-02-24 | 河南理工大学 | Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof |
| CN108558351A (en) * | 2018-06-13 | 2018-09-21 | 大连理工大学 | A kind of low alkali plant-growing concrete building block and preparation method thereof for making aggregate with artificial carbonization slag bead |
| CN111517707A (en) * | 2020-03-30 | 2020-08-11 | 杨辉 | Ecological slope protection concrete and construction method thereof |
| CN113105183A (en) * | 2021-04-08 | 2021-07-13 | 山东泰安建筑工程集团有限公司 | Preparation method of low-alkalinity concrete for marine artificial fish reef |
| CN113956070A (en) * | 2021-11-22 | 2022-01-21 | 华新水泥股份有限公司 | Cement kiln tail gas carbonization autoclaved-free aerated concrete wall product and preparation method thereof |
| CN114477942A (en) * | 2022-02-07 | 2022-05-13 | 武汉理工大学 | Low-alkalinity high-strength pervious concrete and preparation method and application thereof |
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- 2022-08-05 CN CN202210935843.5A patent/CN115321904B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120152152A1 (en) * | 2010-12-21 | 2012-06-21 | Ruentex Engineering & Construction Co., Ltd. | Low calcium cementitious material and method of manufacturing low calcium cement |
| CN105347706A (en) * | 2015-10-29 | 2016-02-24 | 河南理工大学 | Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof |
| CN108558351A (en) * | 2018-06-13 | 2018-09-21 | 大连理工大学 | A kind of low alkali plant-growing concrete building block and preparation method thereof for making aggregate with artificial carbonization slag bead |
| CN111517707A (en) * | 2020-03-30 | 2020-08-11 | 杨辉 | Ecological slope protection concrete and construction method thereof |
| CN113105183A (en) * | 2021-04-08 | 2021-07-13 | 山东泰安建筑工程集团有限公司 | Preparation method of low-alkalinity concrete for marine artificial fish reef |
| CN113956070A (en) * | 2021-11-22 | 2022-01-21 | 华新水泥股份有限公司 | Cement kiln tail gas carbonization autoclaved-free aerated concrete wall product and preparation method thereof |
| CN114477942A (en) * | 2022-02-07 | 2022-05-13 | 武汉理工大学 | Low-alkalinity high-strength pervious concrete and preparation method and application thereof |
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