Single-component alkali-activated fly ash cement

A technology of fly ash cement and alkali excitation, applied in the field of cement materials, can solve the problems of environmental pollution and high energy consumption, and achieve the effects of simple use method, simple process and easy realization.

Pending Publication Date: 2018-08-17
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The patent (CN 102875041A) "A method for preparing single-component alkali-activated cement cured at room temperature by low-temperature calcination" and the patent (CN 104446040A) "a method for preparing composite single-component alkali-activated cement cured at room temperature" introduced the use of calcined silicon The content of single-component alkali-activated cement is prepared

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  • Single-component alkali-activated fly ash cement

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preparation example Construction

[0015] A kind of single-component alkali activated fly ash cement, its preparation method comprises the steps:

[0016] (1) Recycle and store fly ash to avoid mixing or polluting fly ash with other sundries;

[0017] (2) Mix fly ash, solid sodium hydroxide, solid magnesium oxide, and solid calcium oxide in proportion, and ball mill for 2 hours to get the finished product.

[0018] The raw materials used are calculated by weight percentage: fly ash 70%-80%, solid sodium hydroxide 12%-16%, solid magnesium oxide 3%-7%, solid calcium oxide 5%-7%, the weight percentage of each raw material The sum is 100%.

[0019] The single-component alkali-activated fly ash cement and its weight of 28%-38% of water are directly mixed to form cement paste, so that the cement paste has better fluidity, and then poured, and the setting time of the cement paste is immediately adjusted. Test: After vibrating and compacting, maintain at room temperature for 3 days to obtain a cement slurry test bloc...

Embodiment 1

[0025] (1) Recycle and store fly ash to avoid mixing or polluting fly ash with other sundries;

[0026] (2) Mix 75% of fly ash, 14% of solid sodium hydroxide, 5% of solid magnesium oxide, and 6% of solid calcium oxide by weight percentage, and then ball mill for 2 hours to obtain a single-component alkali-activated fly ash cement;

[0027] Stir and mix the obtained single-component alkali-activated fly ash cement with 35% of its weight of water for 2 minutes to form a cement slurry, and then cast it into a test block of 40mm×40mm×160mm. The measured initial setting time is 38 minutes, and the final setting time After vibrating and compacting, it was cured at room temperature for 3 days to obtain a cement slurry test block. The flexural strength was 2.8MPa and the compressive strength was 25MPa, which can meet the actual engineering needs.

Embodiment 2

[0029] (1) Recycle and store fly ash to avoid mixing or polluting fly ash with other sundries;

[0030] (2) Mix 70% of fly ash, 16% of solid sodium hydroxide, 7% of solid magnesium oxide and 7% of solid calcium oxide by weight percentage and then ball mill for 2 hours to prepare single-component alkali-activated fly ash cement.

[0031] Stir and mix the obtained single-component alkali-activated fly ash cement with 37% of its weight of water for 2 minutes to form a cement slurry, and then cast it into a test block of 40mm×40mm×160mm. The measured initial setting time is 36 minutes, and the final setting time After vibrating and compacting, it was cured at room temperature for 3 days to obtain a cement slurry test block. The flexural strength was 2.9MPa and the compressive strength was 27MPa, which can meet the actual engineering needs.

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Abstract

The invention discloses single-component alkali-activated fly ash cement which comprises, in weight percent, 70%-80% of fly ash, 12%-16% of solid sodium hydroxide, 3%-7% of solid magnesium oxide, 5%-7% of solid calcium oxide, and the sum of the weight percent is 100%. The single-component alkali-activated fly ash cement is simple in preparation process and low in cost, calcination is omitted in the preparation process of the cement, and the prepared cement is low in corrosion, high in stability and conveniently stored for a long time and has a wide market prospect.

Description

technical field [0001] The invention belongs to the technical field of cement materials, and in particular relates to a single-component alkali-activated fly ash cement. Background technique [0002] In 2017, the world's cement production was 4.2 billion tons, and China accounted for 2.4 billion tons, most of which were ordinary Portland cement. Portland cement CO 2 Emissions are about 1.5 billion tons, accounting for 1.5 billion tons of CO produced by human activities. 2 8%. Alkali-activated cement refers to the three-dimensional network polymeric gel of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron prepared by using natural minerals or solid waste and artificial aluminum-silicon compound as raw materials. Alkali-activated cement is a low-cost, high-performance and environmentally friendly material, which can use solid waste such as slag and coal cinder as raw materials, and has a low preparation temperature and simple process. In addition, alkali-activated...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/36C04B7/38C04B28/02
CPCC04B7/243C04B7/36C04B7/38C04B28/021C04B2201/50C04B22/002Y02P40/10
Inventor 吴文达吴恺云
Owner FUZHOU UNIVERSITY
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