Composite admixture for high strength concrete and preparation method thereof

A composite admixture and high-strength concrete technology, which is applied in the field of building material concrete, can solve the problems of reducing the heat of hydration, reducing the porosity of high-strength concrete, complex processes, etc., so as to reduce the heat of hydration and porosity and enhance the hydration effect. , the effect of durability improvement

Inactive Publication Date: 2015-09-16
重庆市建筑科学研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the admixture is usually relatively simple, high-strength concrete cannot meet the requirements in terms of reducing porosity and heat of hydration
[0004] Though Chinese patent application CN102757195A adopts paddy ash, water slag, river sand and VAE emulsion as raw material, makes composite admixture after concrete grinding, but this composite admixture also needs to be through mixing and grinding, and technology is more complicated, does not need It is conducive to energy saving and utilization, and there is no description of the components of VAE emulsion. It is still unknown whether it will affect the alkali content and durability of concrete, and it cannot be widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention provides a composite admixture for high-strength concrete and a preparation method thereof;

[0030] Based on the preparation of 1 ton of high-strength concrete admixture, it includes 10kg of cement clinker, 200kg of silica fume, 200kg of finely ground sulfur-fixing ash, 200kg of superfine fly ash, 10kg of plasticizer, 10kg of strength activator, and finely ground slag powder 370kg.

[0031] The cement clinker is Portland cement clinker, produced by Chongqing Lafarge Cement, the model is 42.5R.

[0032] The specific surface area of ​​silica fume is required to be greater than 15000m 2 / kg. .

[0033] The specific surface area of ​​finely ground sulfur-fixed ash is 600-800m 2 / kg can be.

[0034] The specific surface area of ​​ultrafine fly ash is 1000-2000 m 2 / kg can be.

[0035] The plasticizer is powdered polycarboxylate water reducer.

[0036] The specific surface area of ​​finely ground slag powder is 400-600 m 2 / kg, the 28d activity index i...

Embodiment 2

[0057] The preparation method of the composite admixture in this example is the same as that in Example 1, the main difference lies in the proportioning of each component.

[0058] In order to prepare 1 ton of high-strength concrete composite admixture, it consists of the following components in weight percentage: 30kg of cement clinker, 300kg of silica fume, 300kg of ground sulfur-fixed ash, 300kg of ultrafine fly ash, 20kg of plasticizer, Strength stimulating agent 20kg, ground slag powder 30kg.

[0059] With reference to the experimental method of Example 1, the test results obtained are as follows.

[0060] serial number Concrete cementitious material (kg / m 3 ) Composite admixture of the present invention (kg / m 3 ) Traditional admixture (kg / m 3 ) Granular aggregate (kg / m 3 ) water-binder ratio 7d strength (MPa) 28d strength (MPa) The total cracking area per unit area c (mm 2 / m 2 ) 1 450 50 0 1800 0.3 62.9 66.9 100

Embodiment 3

[0062] The preparation method of the composite admixture in this example is the same as that in Example 1, the main difference lies in the proportioning of each component.

[0063] In order to prepare 1 ton of high-strength concrete composite admixture, it consists of the following components in weight percentage: 20kg of cement clinker, 250kg of silica fume, 240kg of finely ground sulfur-fixed ash, 260kg of ultrafine fly ash, 16kg of plasticizer, Strength stimulating agent 15kg, ground slag powder 199kg.

[0064] With reference to the experimental method of Example 1, the test results obtained are as follows.

[0065] serial number Concrete cementitious material (kg / m 3 ) Composite admixture of the present invention (kg / m 3 ) Traditional admixture (kg / m 3 ) Granular aggregate (kg / m 3 ) water-binder ratio 7d strength (MPa) 28d strength (MPa) The total cracking area per unit area c (mm 2 / m 2 ) 1 450 50 0 1800 0.3 61.9 66.7 400

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Abstract

Belonging to the technical field of building material concrete, the invention in particular relates to a composite admixture for high strength concrete and a preparation method thereof. The composite admixture for high strength concrete is formed by mixing of the following components by weight percentage: 1%-3% of cement clinker, 20%-30% of silica fume, 20%-30% of levigated desulphurization ash, 20%-30% of superfine fly ash, 1%-2% of a plasticizer, 1%-2% of a strength exciting agent, and the balance levigated slag powder. Specifically, the strength exciting agent is formed by mixing of an additive XC, triethanolamine, triisopropanolamine, redispersible latex powder, nano-silica and xanthan gum in a ratio of 1:1.5-3:1.5-3:0.015-0.04:0.8-1.2:0.4-0.6, and the plasticizer is powdery polycarboxylate superplasticizer. The composite admixture adopting the technical scheme of the invention can improve the concrete strength and durability, and is easy to prepare.

Description

technical field [0001] The invention belongs to the technical field of building material concrete, and in particular relates to a composite admixture for high-strength concrete and a preparation method thereof. Background technique [0002] With the development of construction technology and the tightness of urban land use, urban central buildings continue to develop towards high-rise and super high-rise buildings, and the development space of high-rise and super high-rise buildings is very huge. Taking the main city of Chongqing as an example, due to the special mountainous landforms and climate environment, there are many plans for tower-type high-rise buildings. For example, the super high-rise buildings with a height of more than 400 meters planned in the near future include Jialing Fanying, Chongqing Jiangbeizui International Financial Center, and the top of Jiangbei. Waiting for nearly 10 buildings. These high-rise buildings need to use high-strength ready-mixed concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
Inventor 石从黎宋开伟陈希才李志坤杨再富陈敬辛转红都增延王春兰
Owner 重庆市建筑科学研究院有限公司
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