CN107548949B - Low-alkalinity cementing material for plant-growing concrete and preparation method thereof - Google Patents
Low-alkalinity cementing material for plant-growing concrete and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of plant-growing concrete materials, in particular to a low-alkalinity cementing material for plant-growing concrete and a preparation method thereof. The components and the parts by weight are as follows: 60-100 parts of superfine slag powder; 20-30 parts of Portland cement; 0-20 parts of a modification component; 5-20 parts of waste mortar powder; 0.05-0.5 part of waste rubber particles; 0-1 part of expanded perlite powder; 0.1-2 parts of a water reducing agent. Firstly, adding the water reducing agent, the modified component, the waste mortar powder and the expanded perlite powder into the portland cement, uniformly mixing, and then mixing with the waste rubber particles and the superfine slag powder to prepare the low-alkalinity cementing material. The invention can fully utilize industrial waste, realize the resource utilization of the waste and is beneficial to the later performance exertion of the gelled material; the pH value of the system is effectively reduced, so that good growth conditions are provided for plants, and the comprehensive performance of the plant-growing pervious concrete is improved.
Description
Technical Field
The invention relates to the field of plant-growing concrete materials, in particular to a low-alkalinity cementing material for plant-growing concrete and a preparation method thereof.
Background
In order to realize coexistence of green plants and concrete, alleviate negative effects of a large number of concrete buildings on people, enlarge greening area, protect and utilize water and soil, and plant-growing concrete is widely concerned. The vegetation ecological concrete can protect water and soil, keep water sources, absorb sound, reduce noise and beautify the environment, and improves and fully exerts the function of the vegetation ecological concrete in sponge city construction.
The cementing material used in the preparation of the green concrete is usually portland cement, or an admixture is added into the portland cement, but in the system, due to the components and hydration characteristics of the portland cement cementing material system, the pH value of a water soaking liquid of the system after solidification is higher, generally greater than the pH value of 9.5, even greater than 10. In addition, the composition and hydration characteristics of the existing plant-growing concrete cementing material system are not beneficial to improving the frost resistance of plant-growing concrete, seriously affect the growth of plants and particularly restrict the popularization and the application of the plant-growing concrete in northern areas.
Disclosure of Invention
The invention aims to provide a low-alkalinity cementing material for plant-growing concrete and a preparation method thereof, which fully utilize industrial wastes to prepare the cementing material beneficial to reducing the alkalinity of the plant-growing concrete, are beneficial to realizing the reclamation of the industrial wastes, can also reduce the alkalinity of the plant-growing concrete, improve the growth condition of plants, improve the frost resistance, reduce the cost, promote the application of the plant-growing concrete in urban construction, particularly improve the urban greening environment and realize the integrated functions of covering, greening and water and soil protection.
The technical scheme of the invention is as follows:
a low-alkalinity cementing material for plant-growing concrete comprises the following components in parts by weight:
the low-alkalinity cementing material for the vegetation concrete has the specific surface area of the superfine slag powder of more than 650m2/Kg。
The low-alkalinity cementing material for the plant-growing concrete has the following advantages that the proportion of the superfine slag powder to the silicate cement is 3-5: 1.
the low-alkalinity cementing material for the plant-growing concrete comprises one or more than two of lime, natural gypsum, desulfurized gypsum and calcium phosphate as modified components, and the specific surface area of the low-alkalinity cementing material is more than 500m2/Kg。
The low-alkalinity cementing material for the vegetation concrete is prepared by grinding waste mortar or residues of the waste concrete after coarse aggregates are removed into fine powder, and the specific surface area of the waste mortar powder is more than 500m2/Kg。
The low-alkalinity cementing material for the plant-growing concrete is characterized in that the waste rubber particles are waste tire rubber particles of vehicles, and the particle size of the waste tire rubber particles is 0.1-1.0 mm.
The preparation method of the low-alkalinity cementing material for the vegetation concrete comprises the steps of firstly adding the water reducing agent, the modifying component, the waste mortar powder and the expanded perlite powder into the portland cement, uniformly mixing, and then mixing with the waste rubber particles and the superfine slag powder to prepare the low-alkalinity cementing material.
The preparation method of the low-alkalinity cementing material for the plant-growing concrete comprises the following technical indexes: the initial setting time is 1.5-3 hours, the final setting time is 4-6 hours, the 28-day compressive strength is 40-55 MPa, and the pH value of the cured soak solution is 9.0-9.5.
The invention has the advantages and beneficial effects that:
1. according to the low-alkalinity cementing material for the plant-growing concrete and the preparation method thereof, the 28-day compressive strength of the cementing material reaches 40-55 MPa, and the frost resistance of the plant-growing concrete is obviously improved. Therefore, the invention can obviously improve the compressive strength of the plant-growing concrete and improve the freezing resistance, and is particularly suitable for being used in northern city construction.
2. The low-alkalinity cementing material for the plant-growing concrete and the preparation method thereof can reduce the pH value of a plant-growing concrete soaking water solution to 9.0-9.5, improve the growth environment of plants, and are beneficial to the germination and growth of the plants and the prolongation of the life cycle of the plants. The invention has the other important characteristics of low material cost and simple preparation process, and can be widely applied to actual engineering.
3. The low-alkalinity cementing material for the plant-growing concrete and the preparation method thereof fully utilize industrial wastes, are beneficial to realizing the resource utilization of the industrial wastes, can reduce the cost of the cementing material in the plant-growing concrete, and are beneficial to the later performance exertion of the cementing material.
4. The invention effectively reduces the pH value of the system, provides good growth conditions for plants and is beneficial to improving the comprehensive performance of the plant-growing pervious concrete.
Drawings
FIG. 1 is an SEM photograph of example 1 after 28 days of hydration.
FIG. 2 is an SEM photograph of example 5 after 28 days of hydration.
FIG. 3 is an SEM photograph of example 6 after 28 days of hydration.
Detailed Description
In the specific implementation process, the low-alkalinity cementing material for the plant-growing concrete and the preparation method thereof comprise the following components in parts by weight:
wherein the specific surface area of the superfine slag powder is more than 650m2Per Kg, preferably with a specific surface area of more than 700m2The dosage of the Per-Kg is 3-5: 1, preferably 3-4: 1, optimally 3.5: 1; the preferable mass portion of the superfine slag powder is 70-100 parts, and the preferable mass portion of the portland cement is 25-30 parts. The modified component is one or more than two of lime, natural gypsum, desulfurized gypsum and calcium phosphate, and the specific surface area of the modified component is more than 500m2Per Kg, preferably with a specific surface area of more than 550m2Per Kg, preferably 5 to 15 parts by mass; the waste mortar powder is fine powder prepared by grinding waste mortar or waste concrete after coarse aggregate is removed, and the specific surface area of the waste mortar powder is more than 500m2Per Kg, preferably with a specific surface area of more than 550m2The preferable weight portion of the catalyst is 10-20 parts per Kg. The waste rubber particles are waste tire rubber particles of vehicles, and the particle size of the waste tire rubber particles is 0.1-1.0 mm, preferably 0.1-0.5 mm. The granularity of the expanded perlite powder is 150-250 meshes, and the preferable mass portion is 0.1-0.5 portion. The water reducing agent is one of a polycarboxylic acid water reducing agent (powder), a naphthalene water reducing agent (powder) and a sulfamate water reducing agent (powder), and the preferable mass portion is 0.15-1.0 portion.
In the invention, the functions and the synergistic effects of the components are as follows:
(1) superfine slag powder: has high specific surface area, can exert good gelling performance under the action of cement hydration products and modified graves, ensures the strength of the plant concrete, can improve the durability of the plant concrete such as frost resistance and the like, and can reduce the alkalinity of the concrete.
(2) Portland cement: as an auxiliary cementing material, the cementing function can be realized, and in addition, more importantly, the hydration product of the portland cement can effectively promote the hydration of the superfine slag powder, excite the hydration and gelation performance of the superfine slag powder and powerfully play the contribution of the superfine slag powder to the strength.
(3) The modified components: can improve the hydration characteristic of the superfine slag powder and adjust the hydration process of the cementing material, which is beneficial to the formation of the stone-like structure of the cementing material.
(4) Waste mortar powder: the hydration performance of the superfine slag powder is adjusted, the hardening structure is improved, the pH value of the system is reduced, and the strength and the durability of the plant-growing concrete prepared by the low-alkalinity cementing material mainly containing the superfine slag powder are facilitated.
(5) Waste rubber particles: the hardened structure formed by the low-alkalinity cementing material is adjusted, the freezing resistance is improved, the pH value of the system is favorably reduced, and the water permeability of the plant-growing concrete is favorably improved.
(6) Expanding perlite powder: the hydration performance and the hardened set cement structure of the low-alkalinity cementing material system are improved, the compact accumulation among particles is promoted, and meanwhile, the pH value of the system is reduced, the water is absorbed, the water loss speed is reduced, and the plant growth condition is improved.
(7) Water reducing agent: the water amount required by the cementing material is reduced, and the improvement of the strength and the durability is facilitated.
The preparation method of the low-alkalinity cementing material for the vegetation concrete comprises the steps of adding the water reducing agent, the modifying component, the waste mortar powder and the expanded perlite powder into the portland cement, uniformly mixing, and mixing with the waste rubber particles and the superfine slag powder to prepare the low-alkalinity cementing material.
For a better understanding of the present invention, the present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the examples.
Example 1:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly, 0.2 part of sulfamate water reducing agent (powder), 15 parts of desulfurized gypsum powder and 520m of specific surface area2Perkg of 10 parts of waste mortar powder and 0.1 part of 150-mesh expanded perlite powder are added25 parts of Portland cement (PO42.5), and 0.5 part of waste rubber particles having a particle size of 0.4mm and a specific surface area of 650m280 Kg of ultrafine slag powder are mixed evenly to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 2.5 hours, final setting time is 6 hours, 28-day compressive strength of the cementing material is 40.8MPa, and the pH value of a water soaking solution after solidification is 9.45.
As shown in FIG. 1, in the SEM photograph of this example after hydration for 28 days, it can be seen that the hardened structure is dense.
Example 2:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly 0.5 part of polycarboxylic acid water reducing agent (powder), 15 parts of calcium phosphate powder and 550m of specific surface area2Perkg of 12 parts of waste mortar powder and 200 mesh expanded perlite powder, and then adding the mixture into 20 parts of Portland cement (PO42.5), mixing thoroughly, and mixing with 0.05 part of waste rubber particles with a particle size of 0.2mm and a specific surface area of 650m290 Kg of ultrafine slag powder are mixed uniformly to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 2.2 hours, final setting time is 5.5 hours, 28-day compressive strength of the cementing material is 51.5MPa, and the pH value of a water soaking solution after solidification is 9.31.
Example 3:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly, 2.0 parts of polycarboxylic acid water reducing agent (powder), 5 parts of lime powder and 580m of specific surface area2Perkg of 20 parts of waste mortar powder and 0.2 part of 250-mesh expanded perlite powder are added into 30 parts of Portland cement (PO42.5) to be fully mixed, and then the mixture is mixed with 0.2 part of waste rubber particles with the particle size of 0.5mm and the specific surface area of 700m295 Kg of ultrafine slag powder are mixed evenly to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 1.8 hours, final setting time is 4.5 hours, 28-day compressive strength of the cementing material is 55.5MPa, and the pH value of a water soaking solution after solidification is 9.15.
Example 4:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly 0.5 part of naphthalene water reducing agent (powder), 10 parts of desulfurized gypsum powder and 550m of specific surface area2Perkg of 5 parts of waste mortar powder and 180 mesh expanded perlite powder, and then added to 22 parts of Portland cement (PO42.5) and mixed thoroughly, and then mixed with 0.25 part of waste rubber particles with a particle size of 1.0mm and a specific surface area of 650m265 Kg of ultrafine slag powder are mixed uniformly to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 3 hours, final setting time is 6 hours, 28-day compressive strength of the cementing material is 42.5MPa, and the pH value of a water soaking solution after solidification is 9.44.
Example 5:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly, 1.0 part of polycarboxylic acid water reducing agent (powder), 8 parts of natural gypsum powder, 2 parts of calcium phosphate and 550m of specific surface area2Perkg of 10 parts of waste mortar powder and 0.1 part of 200-mesh expanded perlite powder are added into 25 parts of Portland cement (PO42.5) to be fully mixed, and then the mixture is mixed with 0.1 part of waste rubber particles with the particle size of 0.5mm and the specific surface area of 700m272 Kg of superfine slag powder are evenly mixed to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 2 hours, final setting time is 5 hours, 28-day compressive strength of the cementing material is 49MPa, and the pH value of a water soaking solution after solidification is 9.23.
As shown in FIG. 2, in the SEM photograph of this example after hydration for 28 days, it can be seen that the hardened structure is dense.
Example 6:
in this example, the low alkalinity gelling material for plant-growing concrete and the preparation method thereof are as follows:
according to the mass parts, firstly, 1.3 parts of polycarboxylic acid water reducing agent (powder) and 2 parts of polycarboxylic acid water reducing agentLime, 8 parts of desulfurized gypsum and 580m of specific surface area2Per Kg of 6 parts of waste mortar powder and 0.5 part of 220 mesh expanded perlite powder are added into 28 parts of Portland cement (PO42.5) and mixed thoroughly, and then mixed with 0.05 part of waste rubber particles with the particle size of 0.8mm and the specific surface area of 750m2Perkg of 100 parts of superfine slag powder are uniformly mixed to prepare the cementing material.
The technical indexes of the embodiment are as follows: initial setting time is 1.5 hours, final setting time is 4 hours, 28-day compressive strength of the cementing material is 55MPa, and the pH value of a water soaking solution after solidification is 9.19.
As shown in FIG. 3, in the SEM photograph of the example after hydration for 28 days, it can be seen that the crystals are uniform in size and regularly arranged.
The results of the examples show that the low-alkalinity cementing material for the plant-growing concrete can reduce the pH value of a cementing system, has better 28-day compressive strength and improves the compactness of a structure.
Claims (3)
1. The low-alkalinity cementing material for the plant-growing concrete is characterized by comprising the following components in parts by weight:
the specific surface area is 700m295 parts of/kg superfine slag powder;
30 parts of Portland cement;
5 parts of lime powder;
specific surface area of 580m220 parts of waste mortar powder per kg;
0.2 part of waste rubber particles with the diameter of 0.5 mm;
0.2 portion of expanded perlite powder with 250 meshes;
and 2 parts of a polycarboxylic acid water reducing agent.
2. The method for preparing the low-alkalinity cementing material for vegetation concrete according to claim 1, which is characterized in that the low-alkalinity cementing material is prepared by firstly adding the polycarboxylic acid water reducing agent, the lime powder, the waste mortar powder and the expanded perlite powder into the portland cement, uniformly mixing the mixture, and then mixing the mixture with the waste rubber particles and the superfine slag powder.
3. The method for preparing the low-alkalinity gelling material for green concrete according to claim 2, wherein the technical indexes of the low-alkalinity gelling material are as follows: initial setting time is 1.8 hours, final setting time is 4.5 hours, 28-day compressive strength is 55.5MPa, and the pH value of the cured soak solution is 9.15.
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| CN110407544B (en) * | 2019-07-17 | 2021-09-14 | 华新水泥股份有限公司 | Ecological porous concrete and preparation method and application thereof |
| CN111197062B (en) * | 2020-02-25 | 2023-04-25 | 天津市飞龙砼外加剂有限公司 | Modified plant tannin extract concrete air entraining agent and preparation method thereof |
| CN111763056A (en) * | 2020-06-18 | 2020-10-13 | 陕西容大天盛混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN112645669A (en) * | 2021-01-08 | 2021-04-13 | 马鞍山十七冶工程科技有限责任公司 | Construction solid waste regeneration plant-growing low-alkalinity concrete and manufacturing method thereof |
| CN114656222B (en) | 2022-04-24 | 2022-11-15 | 核工业北京地质研究院 | Low-pH value cementing material and preparation method thereof |
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