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One-component alkali-activated cement

An alkali-activated cement, single-component technology, applied in the field of cement materials, can solve problems such as high energy consumption and environmental pollution, and achieve the effects of reducing corrosion, low cost and strong stability

Active Publication Date: 2018-09-11
FUZHOU UNIVERSITY
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Problems solved by technology

[0004] Patent (CN 102875041A) "A preparation method for preparing single-component alkali-activated cement cured at room temperature by low-temperature calcination" and patent (CN 104446040A) "A method for preparing composite single-component alkali-activated cement cured at room temperature" introduced the use of calcined silica The content of one-component alkali-activated cement is prepared by mixing aluminum oxide raw materials and alkali activator, but its energy consumption is high and pollutes the environment; patent (CN 106045433A) "A kind of single-component alkali-activated nickel slag cement and Its Preparation and Application" introduced the preparation of one-component alkali-activated cement by grinding different raw materials separately and then mixing them. The problem

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  • One-component alkali-activated cement

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preparation example Construction

[0016] A kind of one-component alkali activated cement, its preparation method comprises the steps:

[0017] (1) Recycle and store fly ash and slag to avoid mixing or contamination of fly ash and slag with other sundries; crush albite into stone powder;

[0018] (2) Mix fly ash, solid sodium hydroxide, slag, albite, solid sodium silicate, solid calcium oxide and borax in proportion and ball mill for 2 hours to get the finished product.

[0019] The raw materials used are calculated by weight percentage: fly ash 40%-50%, solid sodium hydroxide 2%-4%, slag 23%-27%, albite 13%-17%, solid sodium silicate 6%- 8%, solid calcium oxide 3%-5%, borax 1%, the sum of the weight percentages of each raw material is 100%.

[0020] Stir and mix the one-component alkali-activated cement with 45%-50% of its weight of water directly to form a cement paste, so that the cement paste has better fluidity, then pour it, and immediately test the setting time of the cement paste; vibration After comp...

Embodiment 1

[0026] (1) Recycle and store fly ash and slag to avoid mixing or polluting fly ash and slag with other sundries; crush albite into stone powder with a particle size of 2-4mm;

[0027] (2) Mix 50% fly ash, 2% solid sodium hydroxide, 23% slag, 13% albite feldspar, 7% solid sodium silicate, 4% solid calcium oxide and 1% borax by weight percentage and ball mill for 2 hours , to prepare one-component alkali-activated cement.

[0028] The obtained one-component alkali-activated cement was stirred and mixed with 45% of its weight of water for 2 minutes to form a cement slurry, and then poured into a test block of 40mm×40mm×160mm. The measured initial setting time was 53 minutes, and the final setting time was 84 minutes ( The initial setting time of Portland cement under the same mixing ratio is 132 minutes, and the final setting time is 328 minutes); after vibrating and compacting, it is maintained at room temperature for 28 days to obtain a cement slurry test block, and its compres...

Embodiment 2

[0030] (1) Recycle and store fly ash and slag to avoid mixing or polluting fly ash and slag with other sundries; crush albite into stone powder with a particle size of 2-4mm;

[0031] (2) Mix 45% of fly ash, 3% of solid sodium hydroxide, 25% of slag, 15% of albite, 6% of solid sodium silicate, 5% of solid calcium oxide and 1% of borax by weight percentage, and then ball mill for 2 hours , to prepare one-component alkali-activated cement.

[0032] The obtained one-component alkali-activated cement was stirred and mixed with 47% water by weight for 2 minutes to form a cement slurry, and then poured into a test block of 40mm×40mm×160mm. The measured initial setting time was 57 minutes, and the final setting time was 90 minutes ( The initial setting time of Portland cement under the same mixing ratio is 132 minutes, and the final setting time is 328 minutes); after vibrating and compacting, it is maintained at room temperature for 28 days to obtain a cement paste test block, and i...

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Abstract

The invention discloses one-component alkali-activated cement. The one-component alkali-activated cement comprises, by weight, 40-50% of fly ash, 2-4% of solid sodium hydroxide, 23-27% of mineral slag, 13-17% of albite, 6-8% of solid sodium silicate, 3-5% of solid calcium oxide and 1% of borax, and the sum of the weight percentage of the raw materials is 100%. The one-component alkali-activated cement has a simple preparation process and a low cost, calcining is not needed in the preparation process, and the obtained cement has low corrosivity, high stability and a broad market prospect and can be stored conveniently for a long term.

Description

technical field [0001] The invention belongs to the technical field of cement materials, and in particular relates to a single-component alkali-activated 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. It can use solid waste such as slag and coal cinder as raw materials, and its preparation temperature is low and the process is simple. In addition, alkali-activated ce...

Claims

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Application Information

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IPC IPC(8): C04B7/345C04B7/26C04B7/14C04B7/38
CPCC04B7/14C04B7/243C04B7/345C04B7/38C04B2201/50Y02P40/10
Inventor 吴文达王雪芳
Owner FUZHOU UNIVERSITY
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