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Composite admixture for concrete

A composite admixture and concrete technology, applied in the field of concrete, can solve the problems of difficult loading and unloading, high water demand, excessive ignition loss, etc., and achieves the effect of ensuring construction workability, improving slurry fluidity, and improving early strength.

Inactive Publication Date: 2012-10-31
CHENGDU JIAXIN TECH
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Problems solved by technology

At present, the research and development of concrete composite admixtures are actively carried out at home and abroad, but there are still the following technical difficulties: 1. The high water demand makes construction difficult and cannot guarantee the strength requirements after construction; 2. It is impossible to obtain high Early strength and ensure that the later strength continues to increase, and even the phenomenon of late strength shrinkage occurs; 3. The content of chloride ions exceeds the standard; the loss on ignition exceeds the standard; 4. The density is too small, which makes loading and unloading difficult and the one-time transportation volume is greatly reduced.

Method used

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  • Composite admixture for concrete
  • Composite admixture for concrete

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Embodiment Construction

[0026] Weighing: specific surface area ≥ 1m 2 / g, 70kg of primary fly ash with 28d compressive strength ratio ≥ 65%, 450kg of silica fume (the content of silica in silica fume is not less than 85%, moisture content is less than 3%, loss on ignition is less than 6%, Volcanic ash activity index greater than 85%, specific surface area ≥ 20m 2 / g), specific surface area ≥ 0.36m 2 / g, 28d activity index greater than or equal to 70% S95 grade granulated blast furnace slag powder 420kg, Yuanming powder 60kg, hydroxypropyl methylcellulose 5kg, UEA expansion agent 5kg, polycarboxylate superplasticizer 3kg, citric acid 0.2 kg, boric acid 0.2kg, sodium gluconate 0.2kg, sodium phosphate 0.2kg, sodium tartrate 0.2kg, calcium carbonate 0.2kg, lithium carbonate 0.2kg, calcium formate 0.2kg, calcium acetate 0.2kg, cellulose ether 0.3kg. Then through mechanical stirring and mixing, the composite admixture for the product concrete of the present invention is made.

[0027] Table 1 is a test ...

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Abstract

The invention discloses a composite admixture for concrete, which is prepared from fly ash, siliceous dust, granulated blast-furnace slag, anhydrous sodium sulphate, hydroxypropyl methyl cellulose, UEA (united expansive agent), polycarboxylic acid water reducing agent, citric acid, boric acid, sodium gluconate, sodium phosphate, sodium tartrate, calcium carbona, lithium carbonate, calcium formate, calcium acetate and cellulose ether. In the practical application of the composite admixture, the strength of concrete is improved, the concrete workability is good, slight bleeding is caused, the use amount of cement is lowered, the unit volume water consumption is lowered, the working performances of the concrete are improved effectively, and the heat of hydration is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a composite admixture for concrete. Background technique [0002] Composite admixtures for concrete are mainly used to greatly improve the early and medium-term and long-term strength of ordinary Portland cement, and have the characteristics of small water demand, high early activity index, and good strength development. It can be widely used in various concrete components, grouting materials, repair materials and other fields based on ordinary Portland cement. At present, the research and development of concrete composite admixtures are actively carried out at home and abroad, but there are still the following technical difficulties: 1. The high water demand makes construction difficult and cannot guarantee the strength requirements after construction; 2. It is impossible to obtain high The strength in the early stage ensures that the strength in the later stage will continue ...

Claims

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Application Information

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IPC IPC(8): C04B18/14
CPCY02W30/91
Inventor 钱炳黄泰东罗小庆雷欣刘顺波胡潮胡杨杨
Owner CHENGDU JIAXIN TECH
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