Preparation method of adding agent for controlling concrete collapse loss

An admixture and slump technology, applied in the field of building materials, can solve the problems of increasing concrete cost and affecting concrete performance, and achieve the effects of controlling slump loss, easy process control, and simple production equipment

Inactive Publication Date: 2006-07-12
INNER MONGOLIA XINGTAI CONSTRAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now some concrete water reducer manufacturers, in order to control the loss of concrete slump, often add citric acid, sodium tripolyphosphate and white sugar, etc., with an amount of 10%-14%, which incre

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At room temperature, put 4000g of commercially available naphthalene-based high-efficiency water reducer (powder, produced by Tianjin Water Reducer Factory) and 500g of calcium lignosulfonate into a horizontal-shaft forced mixer, stir well for 10 minutes, and then put in natural 4000g of zeolite powder, after fully stirring for about 5 minutes, slowly add 150g of water by spraying, stirring for 30 minutes while spraying and discharging, put in a sun shed to dry, crush to obtain powdery admixture.

[0024] Table 1 shows the change results of cement paste fluidity after adding the admixture of this embodiment, and table 2 shows the change of concrete slump.

[0025] The type and dosage of admixture (%)

[0026] Types of additives

[0027] The cement variety in Table 2 is ordinary silicon 42.5.

Embodiment 2

[0029] At room temperature, in a horizontal-shaft forced mixer, put 3000g of commercially available sulfamic acid-based high-efficiency water reducer (water agent, with a solid content of 44%, produced by Shandong Hengjian Admixture Factory) into the mixer, while stirring Slowly drop in 5000g of natural zeolite powder, vigorously stir for 20 minutes, and form a dough, which is air-dried under natural conditions, crushed, and rolled into fine sand to obtain the admixture of the present invention.

[0030] The change result of cement paste fluidity after adding the admixture of this embodiment is shown in Table 3, and the change of concrete slump is shown in Table 4:

[0031] The type and dosage of admixture (%)

Cement consumption (g)

Water cement ratio

(w / b)(%)

Change of fluidity over time (cm)

initial

60min

90min

Tianjin naphthalene high efficiency (powder) 1.5

300g

30

220

160

No

...

Embodiment 3

[0035] At room temperature, in a horizontal-shaft forced mixer, put 4500 g of commercially available melamine-based water reducer (water agent, with a solid content of 35% to 40%, produced by Beijing Nanyuan Admixture Factory) into the mixer, Add 4000g of natural zeolite powder, stir for 15 minutes, dry in a sun shed, and crush to obtain powdery admixture.

[0036] The change result of concrete slump after adding the admixture of this embodiment is shown in Table 5:

[0037] Types of additives

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PUM

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Abstract

The invention relates to a method of making additive for controlling concrete collapsing loss, belonging to building material technical field. The composition of said additive is: zeolitic powder, water reducing agent, calcium lignosulfonate and water. Its making method is: mix water reducing agent and calcium lignosulfonate in definite proportions, stir the mixture thoroughly; add natural zeolitic powder to the mixture in proportions and stir it; spray said mixture and add water to it in proportions, stir it at the same time, dry at the room temperature, and crush to get said additive.The additive making method in said invention is characterized by: there is only physical adsorption and desorption process without chemical reaction, therefore, it is friendly to environment without releasing of waste liquid, waste gas, waste slag, etc; it only needs strong mixing at normal temperature during the production process with simple production facilities, and the technique is easy to control. The additive is capable of diminishing and controlling collapsing loss, which could not only control collapsing loss of common concrete, but also control collapsing loss of high-intensity high fluidized form concrete.

Description

technical field [0001] The invention relates to a preparation method of an admixture for controlling concrete slump loss, and belongs to the technical field of building materials. Background technique [0002] According to reports, my country's concrete output has reached 2 billion m 3 / year. The annual output of ready-mixed concrete also reaches about 500-600 million m 3 / year. The technical problem encountered in the construction and application of ready-mixed concrete is the rapid loss of slump, especially in the process of transportation and construction of high-strength high-performance concrete, the loss of slump is faster, and it is difficult to pump for construction. In summer, when the commercial concrete is transported from the mixing station to the construction site, the concrete cannot be unloaded due to the rapid loss of slump, so the concrete can only be poured out by adding water and re-stirring on site. But this kind of concrete cannot guarantee the quali...

Claims

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Application Information

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IPC IPC(8): C04B24/00C04B22/00C04B103/20
Inventor 冯乃谦石云兴
Owner INNER MONGOLIA XINGTAI CONSTRAL GRP CO LTD
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