CN114394807A - Porous plant-growing concrete capable of improving plant-growing performance - Google Patents

Porous plant-growing concrete capable of improving plant-growing performance Download PDF

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CN114394807A
CN114394807A CN202210202240.4A CN202210202240A CN114394807A CN 114394807 A CN114394807 A CN 114394807A CN 202210202240 A CN202210202240 A CN 202210202240A CN 114394807 A CN114394807 A CN 114394807A
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emulsion
concrete
cement
plant
growing
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陈建国
韩伟栋
许现旭
刘鲁强
黄卓杰
黄小兵
甘福
朱芳坛
陈美琴
陈耿
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GUANGXI HYDRAULIC RESEARCH INSTITUTE
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00758Uses not provided for elsewhere in C04B2111/00 for agri-, sylvi- or piscicultural or cattle-breeding applications
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Cultivation Of Plants (AREA)

Abstract

The invention discloses porous plant growing concrete capable of improving plant growing performance, which is prepared from the following raw materials in parts by mass: 200 parts of cement 180-; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion. According to the invention, the mixed emulsion composed of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion is added, so that the hydration reaction of C2S can be delayed, and the hydration of sulphoaluminate cement is further delayed; while in the hydration process, the modified cement slurry doped with the emulsion forms Al (OH)3And the pH value of the cement is reduced along with the increase of the mixing amount of the emulsion. The recycled aggregate plant-growing concrete modified by the emulsion can greatly reduce the poresThe pH value of the solution improves the planting performance of the concrete, can adapt to the growth of green plants, can play the effects of greening the environment and restoring the ecology for a long time, and can also improve the compressive strength of the planting concrete.

Description

Porous plant-growing concrete capable of improving plant-growing performance
Technical Field
The invention relates to the technical field of building materials, in particular to porous plant-growing concrete capable of improving plant-growing performance.
Background
The plant-growing concrete is porous concrete and a product thereof, which can adapt to the growth of green plants and meet the operation requirements of the green plants, continuous pores are distributed in the concrete, and water, air and the like can easily pass through the concrete, so that the plant-growing concrete not only can ensure the basic function of the plant-growing concrete as a material structure, but also can reduce the environmental load, has important effects on the aspects of enhancing the ground moisture-heat exchange, adjusting the temperature and humidity, improving the underground water level, absorbing noise and the like, and has remarkable ecological benefit.
In addition, the pH value of the pore solution of the ordinary portland cement concrete is as high as 12-13, and the pH value range suitable for plant growth is 3.5-10, so that the technology for reducing the pH value of the pore solution in the plant growth concrete is a key problem for improving the plant growth performance of the plant growth concrete. At present, however, FeSO is mainly adopted to reduce the PH value of the plant-growing concrete4The alkalinity of the concrete pore solution can be reduced within a certain range by adopting the method, the pH value is maintained to be about 10-12, and only the growth of partial alkali-resistant plants is met. Meanwhile, the alkali precipitation of concrete pores is a dynamic process, the concrete is continuously placed in an acid solution to have a deterioration effect on the performance such as strength and the like, and in engineering application, an acid solution soaking method is adopted to continuously carry out concrete precipitationThe difficulty of alkali reduction treatment of soil is high, and the construction cost is high. Therefore, how to reduce the pH value of the plant growing concrete to improve the plant growing performance remains a current research focus.
Disclosure of Invention
The invention provides porous plant-growing concrete capable of improving plant-growing performance and a preparation method thereof, aiming at solving the problem of overhigh pH value of plant-growing concrete. The invention adopts the mixed emulsion formed by adding the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion to delay C2The hydration reaction of S further delays the hydration of the sulphoaluminate cement; while in the hydration process, the modified cement slurry doped with the emulsion forms Al (OH)3And the pH value of the cement is reduced along with the increase of the mixing amount of the emulsion. The recycled aggregate plant-growing concrete modified by the emulsion can greatly reduce the pH value of a pore solution, improve the plant-growing performance of the concrete and simultaneously improve the compressive strength of the plant-growing concrete.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 200 parts of cement 180-; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion.
As a preferred technical scheme of the invention: the mass ratio of the styrene-acrylic emulsion to the VAE emulsion to the styrene-butadiene emulsion is 2-4:2-4: 2-4.
As a preferred technical scheme of the invention: the mass ratio of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion is 3: 4: 3.
As a preferred technical scheme of the invention: the mass ratio of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion is 3: 4.
As a preferred technical scheme of the invention: the cement is low-alkalinity sulphoaluminate cement.
As a preferred technical scheme of the invention: the recycled coarse aggregate is formed by crushing demolished building garbage and has the particle size of 20-40 mm. Apparent density 2350kg/m3Bulk density of 1362kg/m3Crushing fingerThe mark is 17.3%.
The invention also provides a preparation method of the porous plant-growing concrete, which comprises the following steps: the cement-based mortar is prepared by adopting a pre-slurry wrapping method, wherein part of cement, water and all coarse aggregates are added and stirred to enable a cementing material to wrap the surfaces of the coarse aggregates, and then the rest of water and cement based on emulsion are added and stirred uniformly.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the mixed emulsion formed by adding the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion can delay C2The hydration reaction of S further delays the hydration of the sulphoaluminate cement; while in the hydration process, the modified cement slurry doped with the emulsion forms Al (OH)3And the pH value of the cement is reduced along with the increase of the mixing amount of the emulsion. The recycled aggregate plant-growing concrete modified by the emulsion can greatly reduce the pH value of a pore solution, improve the plant-growing performance of the concrete, adapt to the growth of green plants, play a role in greening the environment and restoring the ecology for a long time, and improve the compressive strength of the plant-growing concrete.
Drawings
FIG. 1 is a graph showing the vegetation effect of porous vegetation concrete provided in example 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 193 parts of cement, 1335 parts of recycled coarse aggregate, 10 parts of emulsion and 58 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 4: 2.
The cement is low-alkalinity thioaluminateSalt cement, density 2790kg/cm3Specific surface area 436m2The water consumption of the standard consistency is 32 percent, and the compression strength and the rupture strength of the steel plate at 28 days are 47.0MPa and 7.5MPa respectively.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 2
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 193 parts of cement, 1335 parts of recycled coarse aggregate, 10 parts of emulsion and 58 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 3: 4: 3.
The cement is low-alkalinity sulphoaluminate cement with the density of 2790kg/cm3Specific surface area 436m2The water consumption of the standard consistency is 32 percent, and the compression strength and the rupture strength of the steel plate at 28 days are 47.0MPa and 7.5MPa respectively.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 3
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 193 parts of cement, 1335 parts of recycled coarse aggregate, 10 parts of emulsion and 58 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 4: 2: 4.
The cement is low-alkalinity sulphoaluminate cement with the density of 2790kg/cm3Specific surface area 436m2The water consumption of the standard consistency is 32 percent, and the compression strength and the rupture strength of the steel plate at 28 days are 47.0MPa and 7.5MPa respectively.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 4
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 193 parts of cement, 1335 parts of recycled coarse aggregate, 10 parts of emulsion and 58 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 3: 4.
The cement is low-alkalinity sulphoaluminate cement with the density of 2790kg/cm3Specific surface area 436m2The water consumption of the standard consistency is 32 percent, and the compression strength and the rupture strength of the steel plate at 28 days are 47.0MPa and 7.5MPa respectively.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 5
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 182 parts of cement, 1285 parts of recycled coarse aggregate, 15 parts of emulsion and 55 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 3: 3.
The cement is ordinary portland cement of PO 42.5.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 6
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 198 parts of cement, 1386 parts of recycled coarse aggregate, 12 parts of emulsion and 62 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 4: 3.
The cement is ordinary portland cement of PO 42.5.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Example 7
A porous plant-growing concrete capable of improving plant-growing performance is prepared from the following raw materials in parts by mass: 193 parts of cement, 1335 parts of recycled coarse aggregate, 10 parts of emulsion and 58 parts of water; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion with the mass ratio of 4: 3.
The cement is low-alkalinity sulphoaluminate cement with the density of 2790kg/cm3Specific surface area 436m2The water consumption of the standard consistency is 32 percent, and the compression strength and the rupture strength of the steel plate at 28 days are 47.0MPa and 7.5MPa respectively.
The recycled coarse aggregate is formed by crushing demolished building garbage, and has the particle size of 20-40 mm and the apparent density of 2350kg/m3Bulk density of 1362kg/m3The crush index was 17.3%.
Comparative example 1
193 parts of low-alkali sulphoaluminate cement, 1335 parts of recycled coarse aggregate and 58 parts of water.
Comparative example 2
193 parts of low-alkali sulphoaluminate cement, 1335 parts of recycled coarse aggregate, 3 parts of styrene-acrylic emulsion and 58 parts of water.
Comparative example 3
193 parts of low-alkali sulphoaluminate cement, 1335 parts of recycled coarse aggregate, 3 parts of VAE emulsion and 58 parts of water.
Comparative example 4
193 parts of low-alkali sulphoaluminate cement, 1335 parts of recycled coarse aggregate, 4 parts of styrene-butadiene emulsion and 58 parts of water.
Comparative example 5
193 parts of ordinary portland cement, 1335 parts of recycled coarse aggregate and 58 parts of water.
Porous green concrete was prepared by using examples 1 to 7 and comparative example 4 as follows: the cement mortar is prepared by adopting a pre-slurry wrapping method, 30 parts of cement, 45 parts of water and all coarse aggregates are added and stirred, so that the surface of the coarse aggregates is wrapped by a cementing material, then the rest water and cement based on emulsion are added and stirred uniformly.
And (3) filling the plant-growing concrete mixture into test molds in 3 layers for insertion and tamping, wherein each layer is inserted and tamped for 25 times, after the mold filling and insertion and tamping are completed, the upper surface of each test mold is leveled in a manual static pressure pressurizing mode, and the formed plant-growing concrete test block is obtained. The compressive strength, effective porosity, water permeability coefficient and pH value of the internal pore solution of the concrete test block were measured by a conventional method, and the measurement results are shown in Table 1.
Compressive strength: the cubic concrete compressive strength is measured according to the test protocol for hydraulic concrete (SL/T352-2020), and the test piece size is 150X 150 mm.
Effective void fraction: forming a zeolite plant-growing concrete test block with the size of 150mm multiplied by 150mm, curing to the age of 28d, and weighing the mass W1 of the test block in the air after curing for 24 h; putting the test block into an oven to be dried for 24 hours, and weighing the mass W2 of the test block; and (3) soaking the test block in water for 24h, weighing the mass W3 of the test block in the water after the test block is saturated with water. The calculation was performed according to equations (1) and (2).
Figure BDA0003527849050000071
Figure BDA0003527849050000072
Water permeability coefficient: the water permeability coefficient of the zeolite plant-growing concrete is tested according to a water permeability coefficient testing method in technical Specification for permeable cement concrete pavements (CJJ/T135-2009).
PH of internal pore solution: firstly, curing the zeolite plant-growing concrete test block for a corresponding age; and then soaking the zeolite plant-growing concrete in water for 24 hours, and measuring the pH value of the soaking water in the barrel by using a pHS-3C type precise pH meter. Repeating for a plurality of times until the measured values of the previous and next 2 times are unchanged, namely the pH value of the pore solution of the concrete.
Table 1: performance test results of porous plant-growing concrete prepared by the invention
Figure BDA0003527849050000073
Figure BDA0003527849050000081
From the test results, the emulsion is added into the porous plant-growing concrete, and due to the synergistic effect of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion, the PH of the porous plant-growing concrete is obviously reduced, and the porous plant-growing concrete has good plant-growing performance.
Effect of plant growth
The plant growth effect is illustrated by taking 3 common riparian plants such as the tall fescue, the alfalfa and the paspalum latifolium as objects, and the accidental nature of the test result is avoided.
In the test, 3 common riparian plants such as the thatch, the alfalfa and the broadleaf paspalum are selected as objects, mixed soil of 50% of nutrient soil and 50% of red soil is prepared to be used as a soil layer matrix of the plant-growing concrete, the size of a concrete test block used in the test is 15cm (length) x 15cm (width) x 6cm (height), the plant-growing concrete with the height of 3cm is covered on the concrete, and then the nutrient soil with the height of 3cm is placed under the concrete. Under certain conditions of maintenance and management, the growth of the plants is shown in FIG. 1. The growth of 3 plants in the plant growing concrete for 15 days is shown in figure 1, and it can be seen from the figure that the growth of 3 plants is good, the PH value of the internal pore solution is about 9, and the growth condition of the plants can be satisfied.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.

Claims (7)

1. The utility model provides a can improve porous planting concrete that plants living performance which characterized in that: the porous plant-growing concrete is prepared from the following raw materials in percentage by mass: 200 parts of cement 180-; the emulsion consists of styrene-acrylic emulsion, VAE emulsion and butylbenzene emulsion.
2. The porous vegetation concrete capable of enhancing vegetation performance according to claim 1, wherein: the mass ratio of the styrene-acrylic emulsion to the VAE emulsion to the styrene-butadiene emulsion is 2-4:2-4: 2-4.
3. The porous vegetation concrete capable of enhancing vegetation performance according to claim 2, wherein: the mass ratio of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion is 3: 4: 3.
4. The porous vegetation concrete capable of enhancing vegetation performance according to claim 2, wherein: the mass ratio of the styrene-acrylic emulsion, the VAE emulsion and the butylbenzene emulsion is 3: 4.
5. The porous vegetation concrete capable of enhancing vegetation performance according to claim 1, wherein: the cement is low-alkalinity sulphoaluminate cement.
6. The porous vegetation concrete capable of enhancing vegetation performance according to claim 1, wherein: the recycled coarse aggregate is formed by crushing demolished building garbage and has the particle size of 20-40 mm.
7. The preparation of porous plant-growing concrete according to claim 1, wherein the porous plant-growing concrete is prepared by: the porous plant-growing concrete is prepared by adopting a pre-slurry wrapping method, adding part of cement, water and all coarse aggregates for stirring to wrap the cementing materials on the surfaces of the coarse aggregates, then adding the rest water and cement in an emulsion base, and uniformly stirring.
CN202210202240.4A 2022-03-02 2022-03-02 Porous plant-growing concrete capable of improving plant-growing performance Pending CN114394807A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115259749A (en) * 2022-08-10 2022-11-01 郑州大学 Polymer-based plant-growing concrete and preparation method thereof
CN115700231A (en) * 2022-11-11 2023-02-07 杭州汉特建材有限公司 Porous ecological concrete and preparation process thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈建国等: "苯丙乳液改性再生骨料植生混凝土植生试验及应用研究", 《新型建筑材料》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115259749A (en) * 2022-08-10 2022-11-01 郑州大学 Polymer-based plant-growing concrete and preparation method thereof
CN115259749B (en) * 2022-08-10 2023-09-22 郑州大学 Polymer-based vegetation concrete and preparation method thereof
CN115700231A (en) * 2022-11-11 2023-02-07 杭州汉特建材有限公司 Porous ecological concrete and preparation process thereof

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