Neutral sodium salt alkali-activation low-calcium fly ash cement and use method of same

A low-calcium fly ash and ordinary Portland cement technology, applied in cement production and other directions, can solve the problems of slow strength growth, low early strength of low-calcium fly ash cement, etc., achieve good economic benefits, shorten production cycle, A wide range of effects

Inactive Publication Date: 2015-12-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the problems of low early strength and slow strength growth of low-calcium fly ash cement stimulated by neutral sodium saline and alkali

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A low-calcium fly ash cement excited by neutral sodium saline is composed of low-calcium fly ash, ordinary Portland cement and sodium sulfate. According to the percentage by weight, the low-calcium fly ash (purchased from Shanghai Baotian New Building Materials Co., Ltd.) II grade ash, the dosage is 70%; the ordinary Portland cement (purchased from Fujian Lianshi Cement Co., Ltd.) The model is P.O42.5, and the dosage is 30%; the quality of the added sodium sulfate (purchased from Changle Derun Chemical Co., Ltd.) is 5% of the sum of the quality of low-calcium fly ash and ordinary Portland cement.

[0025] The method of use is as follows: first pour low-calcium fly ash, ordinary Portland cement and sodium sulfate into the slurry mixer in proportion to dry mixing for 5 minutes, then add low-calcium fly ash, ordinary Portland cement and sodium sulfate and 0.25 times the water and stir. Stir at low speed for 300s, then at high speed for 90s, until a uniform gelled material...

Embodiment 2

[0028] A low-calcium fly ash cement excited by neutral sodium saline is composed of low-calcium fly ash, ordinary Portland cement and sodium sulfate. According to the percentage by weight, the low-calcium fly ash (purchased from Shanghai Baotian New Building Materials Co., Ltd.) II grade ash, the dosage is 60%; the ordinary Portland cement (purchased from Fujian Stone Cement Co., Ltd.) The model is P.O42.5, and the dosage is 40%; the quality of the added sodium sulfate (purchased from Changle Derun Chemical Co., Ltd.) is 4% of the sum of the quality of low-calcium fly ash and ordinary Portland cement.

[0029] The method of use is as follows: first pour low-calcium fly ash, ordinary Portland cement and sodium sulfate into the slurry mixer in proportion to dry mixing for 5 minutes, then add low-calcium fly ash, ordinary Portland cement and sodium sulfate and 0.3 times the water and stir. Stir at low speed for 300s, then at high speed for 90s, until a uniform gelled material is...

Embodiment 3

[0032] A low-calcium fly ash cement excited by neutral sodium saline is composed of low-calcium fly ash, ordinary Portland cement and sodium sulfate. According to the percentage by weight, the low-calcium fly ash (purchased from Shanghai Baotian New Building Materials Co., Ltd.) II grade ash, the dosage is 50%; the ordinary Portland cement (purchased from Fujian Lianshi Cement Co., Ltd.) The model is P.O42.5, and the dosage is 50%; the quality of the added sodium sulfate (purchased from Changle Derun Chemical Co., Ltd.) is 3% of the sum of the quality of low-calcium fly ash and ordinary Portland cement.

[0033] The method of use is as follows: first pour low-calcium fly ash, ordinary Portland cement and sodium sulfate into the slurry mixer in proportion to dry mixing for 5 minutes, then add low-calcium fly ash, ordinary Portland cement and sodium sulfate and 0.35 times the water and stir. Stir at low speed for 300s, then at high speed for 90s, until a uniform gelled material...

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PUM

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Abstract

The invention discloses a neutral sodium salt alkali-activation low-calcium fly ash cement and a use method of the same. The cement is prepared from low-calcium fly ash and ordinary Portland cement as main raw materials with addition of neutral sodium salt as an activating agent. The raw materials are added with water with stirring to obtain neutral sodium salt alkali-activation low-calcium fly ash cement clear slurry, wherein a curing technology of standard curing for one day and then autoclaved curing is employed. The cement is low-carbon and environment-protective, is low in cost and is high in compressive strength, is excellent in economic, social and environment-protective benefit and is suitable for being popularized and applied in the field of concrete products and prefabricated members in large scale.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a low-calcium fly ash cement activated by neutral sodium saline and alkali and a use method thereof. Background technique [0002] At present, 3.3 billion tons of Ordinary Portland Cement (OPC) are produced annually, and 1.5 tons of raw materials are required to produce each ton of OPC. The cement industry is the third largest contributor to the greenhouse effect (accounting for 5-8%) and consumes 5% of global energy. [0003] In 1979, Davidovits proposed geopolymer cement, which has a wide range of raw materials and simple preparation technology. Compared with OPC, geopolymer cement saves 3 / 5 energy, CO 2 Emissions are reduced by 80% to 90%. Compared with ordinary concrete, concrete formulated with geopolymer cement has better durability, including resistance to chemical corrosion, freeze-thaw resistance, low chloride ion permeability, abrasion resistance, temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 季韬郑登登叶志耿吴怀中梁咏宁
Owner FUZHOU UNIV
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