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Composite low-heat-release high-active superfine powder concrete admixture and making method thereof

A technology of low heat release and admixtures, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem that the fluidity of concrete mixed with slag powder is not significantly improved, and the fluidity of concrete is not significantly improved. The effect of use is not ideal, etc., to achieve the effect of increasing corrosion resistance, high hydration reaction activity, and saving cement

Inactive Publication Date: 2005-01-19
CHINA BUILDING MATERIALS ACAD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problems of this product are: firstly, the utilization rate of slag is already high, and the quantity is insufficient, and other industrial wastes need to be developed; secondly, the temperature rise of concrete with the addition of ultra-fine slag powder is less reduced for seven days , the effect of using in large-volume concrete such as dams is not ideal; moreover, the fluidity of concrete mixed with slag powder does not improve significantly
When steel slag is used alone as a concrete admixture, the particle shape is not good enough because it is crushed from millimeter-sized particles to micron-sized particles, so that the fluidity of concrete does not improve significantly

Method used

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  • Composite low-heat-release high-active superfine powder concrete admixture and making method thereof
  • Composite low-heat-release high-active superfine powder concrete admixture and making method thereof
  • Composite low-heat-release high-active superfine powder concrete admixture and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] (1) Crush the steel slag to less than 6mm, according to the weight ratio: 70% of steel slag, 30% of primary fly ash, and grind together to a specific surface area of ​​510m 2 / kg, made into a composite admixture. The basicity coefficient of steel slag is 3.05. The homogeneity index of the product is 0.94 (weight), the activity index is 0.82 (strength ratio), the fluidity ratio is 1.07, the reduction rate of the heat of hydration in 3 days is 29%, and the reduction rate of heat of hydration in 7 days is 21%.

[0030] Concrete mix ratio

(kg / m 3 )

Slump

(cm)

clotting time

(h:min)

Compressive strength

(MPa)

cement

Compound Admixture

water

the sand

stone

initial

1 hour

initial setting

final set

7 days

28 days

90 days

410

0

188

850

1017

21.5

8.6

8:25

12:10

26.6

41.3

...

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Abstract

A high-activity superfine additive for concrete is prepared from at least two of steel slag, flyash, granular slag of blast furnace and phosphur slag, and gypsum through grinding, proportional mixing and further pulverizing. Its advantages are high specific surface area (more than 400 sq.m / kg), high activity, and low heat release.

Description

technical field [0001] The invention relates to a concrete low-heat-exothermic high-activity admixture manufactured by compounding no less than two kinds of finely ground industrial waste slags, wherein the industrial waste slags include steel slag, fly ash, mineral slag and phosphorous slag. It relates to the concrete material field of the building material industry. Background technique [0002] Technologies relevant to the present invention have the following: [0003] (1) Ultrafine slag powder is used as a mineral admixture for high-performance concrete. This product and technology has been widely used at home and abroad, and national standards have been formulated. The specific surface area of ​​slag powder is greater than 300m 2 / kg. Ultrafine slag powder has high activity and is currently the best concrete admixture. However, the main problems of this product are: firstly, the utilization rate of slag is already high, and the quantity is insufficient, and other in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/00
CPCC04B40/0042Y02W30/91C04B18/08C04B18/141C04B18/142C04B18/145C04B20/008
Inventor 陈益民季小明冀更新
Owner CHINA BUILDING MATERIALS ACAD
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