Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture

A technology of composite minerals and admixtures, applied in the field of artificial sand concrete materials, can solve the problems of high cost and complex composition, and achieve the effects of improving poor fluidity, large specific surface area, and preventing segregation and bleeding

Active Publication Date: 2020-06-05
广州市圣丰混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the admixture can increase the strength of concrete and improve the workability of concrete, the composition is complex and the cost is high

Method used

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  • Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture
  • Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture
  • Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Dry the grinding raw materials according to the proportion, that is, limestone powder 40%, volcanic ash 30%, granulated blast furnace slag 30%, and dry them separately, and control the moisture content of the grinding materials below 2%.

[0051] If the moisture content of the grinding material is too high, static electricity will be generated when the steel balls rub against each other, resulting in the phenomenon of "ball wrapping" (commonly known as full grinding), resulting in low output, high power consumption, and abnormal quality of the finished product ( If it is used in concrete, it is prone to rapid setting phenomenon). Generally, the moisture content of limestone powder before drying is 2% to 3%, the moisture content of slag is 8% to 15%, and the moisture content of pozzolan ash is 15% to 20%. Controlling the water content in the mill to ≤2% can improve the grinding efficiency and obtain stable composite mineral admixtures.

[0052] 2, diethanol monoisopr...

Embodiment 2

[0059] The composite mineral admixture prepared in Example 1 was used to replace the fly ash in an equivalent amount for concrete trial mix (strength grade C30). The admixture used in comparative groups 1-3 is fly ash, and the admixture used in experimental groups 1-3 is the composite mineral admixture prepared in Example 1. The content of each component of the concrete in this embodiment is shown in Table 2.

[0060] Table 2. Contents of each component of concrete (unit: kg / m 3 )

[0061] Numbering Taiwan Cement Conch Cement Hongfeng Cement artificial sand gravel Admixture water Admixture Comparison group 1 290 / / 702 1052 96 170 8.88 Comparison group 2 / 290 / 702 1052 96 170 8.88 Comparison group 3 / / 290 702 1052 96 170 8.88 Implementation group 1 290 / / 702 1052 96 170 8.88 Implementation group 2 / 290 / 702 1052 96 170 8.88 Implementation group 3 / / 290 702 1052 96 ...

Embodiment 3

[0067] In this example, the composite mineral admixture of the present invention is used to completely replace fly ash, and replace 5%, 10%, and 15% of cement to prepare concrete with C30 strength grade, and investigate its performance. The cement used in this implementation is P·Ⅱ42.5R cement produced by Taiwan Cement Co., Ltd.

[0068] Table 4. Contents of each component of concrete (unit: kg / m 3 )

[0069]

[0070] The result is as shown in table 5, when only completely replacing fly ash with composite mineral admixture of the present invention, the concrete strength of making can be higher than the concrete strength of using fly ash, along with the increase of replacing cement ratio, concrete strength Reduced, when fly ash and 15% cement are completely replaced, the concrete strength is still close to that of concrete using only fly ash as an admixture. Therefore, the composite mineral admixture of the present invention can completely replace single mineral admixtures...

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Abstract

The invention relates to a composite mineral admixture, a preparation method thereof and an artificial sand concrete material containing the composite mineral admixture. Grinding raw materials: limestone powder, volcanic ash and granulated blast furnace slag are conveyed into a ball mill in proportion; a composite grinding aid accounting for 0.1-0.2% of the total mass of the grinding raw materialsis added at the same time; the mixture is grinded until the screen residue of a 0.045 mm sieve is less than or equal to 12%, and the specific surface area is controlled to be 450-500 m<2>/kg, therebyobtaining the composite mineral admixture. Limestone powder, natural volcanic ash and blast furnace slag are used as raw materials, a proper composite grinding aid is doped, the performance of the artificial sand concrete can be effectively improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a composite mineral admixture, a preparation method thereof and an artificial sand concrete material containing the composite mineral admixture. Background technique [0002] Concrete refers to the artificial stone made of cement as the main cementitious material, mixed with water, sand, stones, chemical admixtures and mineral admixtures when necessary, mixed in appropriate proportions, uniformly stirred, compacted and cured. [0003] In recent years, due to the government's increased supervision on environmental protection, river sand used in concrete and desalinated sea sand have become increasingly scarce and have been gradually replaced by artificial sand. Due to the limitation of processing technology, artificial sand cannot achieve the same particle shape as natural sand, and the content of stone powder is high, resulting in poor fluidity of concrete containing artificial sand, large slump loss, and easy cracking. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B28/04C04B7/52
CPCC04B40/0039C04B28/04C04B7/52C04B2201/50C04B2111/00017C04B14/28C04B14/14C04B18/141C04B24/122C04B24/026C04B2103/408C04B22/16C04B14/06C04B14/02
Inventor 张颖发姜华曾钰卢志扬徐真
Owner 广州市圣丰混凝土有限公司
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