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A kind of cementitious material for low-alkali, reinforced plant-growing concrete and preparation method thereof

A technology of planting concrete and cementitious materials, applied in cementitious materials for reinforced planting concrete and its preparation, and in the field of low alkalinity, it can solve the problems of high alkalinity of planting concrete, and achieve the effects of strong durability, increased activity, and increased strength

Active Publication Date: 2021-07-20
广西壮族自治区水利科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cementitious material provided can not only fundamentally solve the problem of excessive alkalinity inside the planting concrete, but also obtain planting concrete with high strength, strong durability and good planting performance

Method used

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  • A kind of cementitious material for low-alkali, reinforced plant-growing concrete and preparation method thereof
  • A kind of cementitious material for low-alkali, reinforced plant-growing concrete and preparation method thereof
  • A kind of cementitious material for low-alkali, reinforced plant-growing concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-alkali, reinforced cementitious material for plant-growing concrete. The gelatinous material is prepared from the following raw materials in parts by weight: 71 parts of α-hemihydrate gypsum, 28 parts of metakaolin, 0.7 part of citric acid and polycarboxylic acid The composition of 0.3 parts of water agent.

[0027] The preparation of the α-hemihydrate gypsum is to use natural dihydrate gypsum as a raw material, which is generated in a saturated water vapor autoclave environment at 1.35 atmospheric pressure and a temperature of 130 ° C. CaO and SO 3 The contents are 37.5% and 52.3%, respectively.

[0028] The metakaolin is made of kaolin as a raw material, which is dehydrated by calcining at 750°C for 5 hours to form a metastable high-activity admixture, wherein SiO in metakaolin 2 and Al 2 o 3 The contents are 58.2% and 37.1% respectively, and the whiteness is 73%.

Embodiment 2

[0030] A low-alkali, reinforced cementitious material for plant-growing concrete. The gelatinous material is prepared from the following raw materials in parts by weight: 75 parts of α-hemihydrate gypsum, 24 parts of metakaolin, 0.7 part of citric acid and polycarboxylic acid The composition of 0.3 parts of water agent.

[0031] The preparation of the α-hemihydrate gypsum is to use natural dihydrate gypsum as a raw material, which is generated in a saturated water vapor autoclave environment at 1.2 atmospheric pressure and a temperature of 145°C, wherein CaO and SO 3 The contents are 35.8% and 50.9%, respectively.

[0032] The metakaolin is made of kaolin as a raw material, which is dehydrated by calcining at 700°C for 6 hours to form a metastable high-activity admixture, wherein SiO in metakaolin 2 and Al 2 o 3 The content is 53.6% and 37.6%, and the whiteness is 68%.

Embodiment 3

[0034] A low-alkali, reinforced cementitious material for plant-growing concrete. The gelatinous material is prepared from the following raw materials in parts by weight: 82 parts of α-hemihydrate gypsum, 16 parts of metakaolin, 1.4 parts of citric acid and polycarboxylate The water formulation consists of 0.6 parts.

[0035] The preparation of the α-hemihydrate gypsum is to use natural dihydrate gypsum as a raw material, which is generated in a saturated water vapor autoclave environment at 1.2 atmospheric pressure and a temperature of 145°C, wherein CaO and SO 3 The content was increased from %, % to 35.8% and 50.9% respectively.

[0036] The metakaolin is made of kaolin as a raw material, which is dehydrated by calcining at 700°C for 6 hours to form a metastable high-activity admixture, wherein metakaolin SiO 2 and Al 2 o 3 The content is more than 53.6% and 37.6%, and the whiteness is 68%.

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Abstract

The invention discloses a low-alkali, cementitious material for reinforced planting concrete and a preparation method thereof. The gelatinous material is prepared from the following raw materials in parts by weight: 60-90 parts of α-hemihydrate gypsum, 10-parts of metakaolin 30 parts and 1-2 parts of additive; Said additive is made up of citric acid and polycarboxylate water reducer. The preparation of the α-hemihydrate gypsum is to use natural dihydrate gypsum as a raw material, and it is generated in a saturated steam autoclave environment with a pressure of 1.1 to 1.4 atmospheres and a temperature of 120 to 145°C; the metakaolin is made of kaolin The raw materials are calcined at 700℃~800℃ for 2h~6h and dehydrated to form a metastable high activity admixture. The invention prepares the planting concrete cementitious material, not only can fundamentally solve the problem of excessive alkalinity inside the planting concrete, but also can obtain the planting concrete with higher strength, stronger durability and good planting performance. The prepared plant-growing concrete is suitable for projects such as river revetment, road slope protection and urban greening, and can have the effect of greening the environment and restoring ecology for a long time.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a cementitious material for low-alkali and reinforced plant-growing concrete and a preparation method thereof. Background technique [0002] Vegetative concrete is a new type of environmentally friendly material composed of sand-free porous concrete, nutrient soil, and topsoil. Vegetative concrete has good water permeability, can adapt to the growth of green plants, enhance the exchange of heat and humidity on the surface, and adjust the groundwater level. It can be applied to the protection and greening of roofs, rivers and roads, and plays an important role in ecological restoration and beautification. [0003] The pH value of plant-growing concrete suitable for plant growth is between 3.5-9.5, while the internal pH value of plant-growing concrete prepared from ordinary Portland cement is as high as 12-13, which cannot meet the needs of plant growth. At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
Inventor 陈建国李林蒋涛郭晋川刘鲁强彭华娟周立新王忠民甘福吴光军黄小兵陈树亮杨建坤吴俣萍韦美富梁晓宁黄华贵
Owner 广西壮族自治区水利科学研究院
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