Concrete expanding agent and its preparation

An expansion agent and concrete technology, which is applied in the field of concrete expansion agent preparation using industrial waste slag fluorine gypsum and fly ash as raw materials, can solve the problems of polluting the environment, low added value, etc. Economical effect

Inactive Publication Date: 2005-09-07
湖南湘铝有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the production process of fluoride salt, a large amount of waste fluoride gypsum discharged is only used as a cement additive at present, with low added value and pollutes the environment. With the expansion of fluoride salt production, the waste fluoride gypsum has increased greatly. In order to better To control environmental pollution, the development and utilization of waste slag is imminent, so the subject of using fluoride gypsum waste slag discharged from the production process of fluoride salt to produce concrete expansion agent is proposed

Method used

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Embodiment Construction

[0009] Fluorogypsum is the slagging in the production process of fluoride salt. Its main component is anhydrous and insoluble calcium sulfate, with a content of ≥85%, and its acid content is 1-4.2%. It can directly use unneutralized fluorogypsum. This can save the cost and process of neutralizing the original lime. According to the hydration and expansion mechanism of the expansion agent, while ensuring that the hydration product is ettringite (calcium sulfoaluminate), one or two types of expansion agent should be selected according to the acid content of fluorogypsum and the alkali content of fly ash. An admixture to achieve the purpose of controlling the alkali content of the system, so as to manufacture low-alkali concrete expansion agent. The proportioning by weight is: 60-40% of fluorine gypsum, 40-60% of fly ash, 0.1-2.0% of admixture, 40 kg of fluorine gypsum, 40 kg of first-grade fly ash, each of the two admixtures 0.4 kg, the measured material is stirred several time...

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Abstract

A bulking agent for concrete is prepared from the fluorogypsum (40-60 wt.%) as the waste dregs generated in preparing fluoride salt, powdered coal ash (40-60) and additive through mixing, pulverizing and homogenizing. Its advantages are low cost, low basicity and low dosage.

Description

technical field [0001] The invention relates to a preparation method of a concrete expansion agent, in particular to a preparation method of a concrete expansion agent using industrial waste residue fluorogypsum and fly ash as raw materials. Background technique [0002] Concrete expansion agent is a concrete admixture with huge market capacity and development prospects. It has the characteristics of reducing the heat of hydration of concrete, improving the strength and impermeability of concrete, and compensating for the shrinkage of concrete. Widely used in underwater engineering, flood control engineering and various large-scale concrete construction projects. The existing domestic concrete expansion agents are generally made of pure raw materials through high-temperature treatment, which has high cost and high energy consumption, and most of them are high-alkali concrete expansion agents, which contain large amounts of fluorine, and the production process is relatively ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B40/00
CPCC04B40/0042Y02W30/91C04B18/0445C04B18/06C04B24/00C04B28/00
Inventor黄安平田宏贵叶军陈铁明
Owner湖南湘铝有限责任公司