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Preparation and use method of alkali remover for porous planting concrete

The technology of concrete and alkali agent is applied in the field of preparation of alkali remover for porous ecological planting concrete, which can solve the problems affecting the promotion and application of porous ecological planting concrete, affecting the growth of porous ecological planting concrete, plant root rot, etc. Dense, fast hydration, avoids the effect of continuous generation

Active Publication Date: 2019-12-31
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a high-alkali environment, it will seriously affect the plant growth of porous ecological planting concrete. In severe cases, the root system of the plant will rot and die, which affects the promotion and application of porous ecological planting concrete.

Method used

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  • Preparation and use method of alkali remover for porous planting concrete
  • Preparation and use method of alkali remover for porous planting concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, weigh 5% slow-release salt sodium bicarbonate, 5% sodium stearate, 5% ferrous sulfate, 25% lignosulfonate and 60% microsilica according to the mass percentage, and place it in a planetary In the pulverizer, grind for 30 minutes at a speed of 300 rpm, use a cement negative pressure sieve and a nitrogen adsorption specific surface area measuring instrument to measure its fineness and specific surface area, and obtain 3% of the 45 μm sieve, with a specific surface area of ​​11000 cm 2 / g alkali removal agent.

Embodiment 2

[0032] First, weigh 3% slow-release calcium bicarbonate, 8% calcium stearate, 5% copper sulfate, 22% polycarboxylate dispersant and 62% microsilica fume according to the mass percentage, and place them in a planetary In the pulverizer, grind for 32 minutes at a speed of 250 rpm, use a cement negative pressure sieve and a nitrogen adsorption specific surface area measuring instrument to measure its fineness and specific surface area, and obtain 2% of the 45 μm sieve, with a specific surface area of ​​11400 cm 2 / g alkali removal agent.

Embodiment 3

[0034] First, weigh 4% slow-release calcium bicarbonate, 8% calcium stearate, 4% copper sulfate, 24% polycarboxylate dispersant and 59% microsilica fume according to the mass percentage, and place them in the planetary In the pulverizer, grind for 35 minutes at a speed of 200 rpm, use a cement negative pressure sieve and a nitrogen adsorption specific surface area measuring instrument to measure its fineness and specific surface area, and obtain 3% of the 45 μm sieve, with a specific surface area of ​​12000 cm 2 / g alkali removal agent.

[0035] Alkali remover use method 1:

[0036] The mix ratio of porous concrete is as follows: Unit: kg / m 3

[0037] cement Aggregate (26~31.5mm) conventional additives Alkali remover 180 1450 5 3

[0038] After using the alkali remover, the effect is as follows:

[0039]

[0040] Alkali remover use method 2:

[0041] The mix ratio of porous concrete is as follows: Unit: kg / m 3

[0042] cement Aggreg...

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Abstract

The invention preparation and application methods of an alkali remover for porous planting concrete. The alkali remover is prepared with slow-release bicarbonate, stearate and sulfite combined with superfine super-pure SiO2 and powdery polycarboxylic acid dispersant or lignosulfonate dispersant; under the action of the dispersant and stearate, it is possible to more sufficiently hydrate cement paste, and a hydration product is more cured; the hydrated calcium hydroxide can react initially with CO2 released by the slow-release salt; by introducing the sulfite, it is possible to exceed the SO4<2-> content of the cement hydration product so that the single-sulfur hydration product is converted into a high-sulfur hydration product; C-S-H can react with SiO2 to generate hydrated calcium silicate having alkalinity less than normal alkalinity so that the alkalinity of the cement hydration product is further reduced, the alkali content of the hydration product is lowered, the alkalinity of the porous planting concrete is lowered, suitable acidity and alkalinity is imparted to the inner structure of the porous concrete, and the growth of plants is benefited.

Description

technical field [0001] The invention belongs to the field of greening materials for slope protection engineering, and particularly relates to a method for preparing and using an alkali-removing agent for porous ecological planting concrete. Background technique [0002] The main structure of the current porous planting ecological concrete is mostly a sandless concrete skeleton prepared by cement and stones, and the thickness, strength, and porosity can be designed according to requirements. The skeleton is made of cement-based materials. When the cement hydrates with water, a large amount of calcium hydroxide and high-alkali hydrated calcium silicate are generated, making the pH value of the aqueous solution inside the pores of the porous concrete as high as about 13. In a high alkali environment, it will seriously affect the plant growth of the porous ecological planting concrete. In severe cases, it will cause the root system of the plant to rot and die, which affects the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/18C04B103/60
CPCC04B40/0039C04B2103/606C04B22/10C04B24/085C04B22/149C04B24/18C04B22/06C04B22/142C04B24/24
Inventor 卞立波宋少民李飞王林袁冬海王琴路宏波周文娟李地红张向前
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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