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Preparation method and application of PD composite mineral admixture containing silica fume

A composite admixture and composite mineral technology, which is applied in the preparation and application of PD composite mineral admixture containing microsilica, and achieves the effects of good popularization and application value, beneficial to industrial production, and comprehensive utilization of resources.

Inactive Publication Date: 2012-10-24
张仲 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite admixture can make up for the problem of low early strength of concrete mixed with volcanic ash, and can also compensate for the disadvantages of later strength decline of concrete caused by stone powder

Method used

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  • Preparation method and application of PD composite mineral admixture containing silica fume
  • Preparation method and application of PD composite mineral admixture containing silica fume
  • Preparation method and application of PD composite mineral admixture containing silica fume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The test material of the PD composite mineral admixture of the present invention, the pozzolan raw material selects the pumice produced in Baoshan, Yunnan, the raw material of the stone powder selects the dolomite sand produced in Baoshan, Yunnan, and the microsilica selects the encrypted silicon powder and gypsum of Zhenyuan Silicon Industry Co., Ltd. in Baoshan, Yunnan. Dihydrate gypsum produced in Yongping, Yunnan was selected. The chemical compositions of the various materials are listed in Table 3.

[0028] Table 3 The chemical composition of each component material used in the test

[0029] material name

Embodiment 2

[0031] The four raw materials in Example 1 were used to prepare 8 groups of test admixtures, namely LA1, LA2...LA8, and LA6 and LA8 were selected to be mixed with gypsum, and the amount of silicon powder was reduced at the same time. The preparation of the admixture is shown in Table 4. Take the 8 groups of test admixtures in Table 4 respectively, and refer to the detection method specified in JG / T 315 "Natural Pozzolan Materials Used in Mortar and Concrete" to test the relevant parameters and test the admixture The test results of the physical properties of the materials are shown in Table 5.

[0032] Table 4 Preparation of test admixtures

[0033] Admixture Code

Volcanic ash / %

Stone powder / %

Silica fume / %

Gypsum / %

Remark

LA1

100

0

0

0

single mixed

LA2

85

0

15

0

double doping

LA3

0

100

0

0

single mixed

LA4

0

85

15

0 ...

Embodiment 3

[0043] Five kinds of admixtures LA1, LA2, LA4, LA7, and LA8 in this test plan were used to prepare ready-mixed commercial concrete C30. The trial strength was 38.5MPa and the slump was 180. The cement was selected from Kunming Iron and Steel Jiahua Xilin brand P.O42 .5, the Nai system retarding high-efficiency superplasticizer, the mix ratio is shown in Table 6, and the concrete physical performance test results are shown in Table 7.

[0044] Table 6 C30 mix ratio of pumped concrete (unit: kg)

[0045]

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Abstract

The present invention provides a preparation method and application of a PD composite mineral admixture containing silica fume. The PD composite mineral admixture comprises components of, by weight percentage, 0%-95% of volcano ash, 0%-95% of mountain flour, 5%-30% of silica micropowder (silica fume) and 0-8% of gypsum, wherein the volcano ash content and mountain flour content can not be zero at the same time, and the gypsum content can be zero according to the requirements. A double-mixing admixture, a ternary-mixing admixture and a quaternary-mixing admixture are prepared by utilizing superimposed effect and interaction effect generated by a quaternary system of ''volcano ash-mountain flour-silica fume-gypsum''. Admixtures with different performance characteristics can be prepared by only adjusting the proportion of the components in the PD composite mineral admixture provided by the invention; the admixture can substitute 15%-50% of cement in concrete and mortar, with equal or excessive amount, and realizes a better effect than an admixture mixed with single volcano ash or mountain flour; and the admixture can be prepared by using local raw materials, or waste stone slag and mountain flour. Therefore, the admixture has good application prospect and promotion value in places lack of conventional admixture.

Description

technical field [0001] The invention relates to a preparation method and application technology of a composite mineral admixture containing microsilica (commonly known as silica fume or silica fume, the same below), which can be widely used in various types of concrete and mortar. Background technique [0002] Mineral admixture is an essential modified material for concrete (mortar). As an important part of ordinary concrete and high-performance concrete, it can improve the working performance and mechanical properties of concrete, reduce the heat of hydration of concrete, and improve the stability of concrete volume. Performance and service life, and can reduce the cost of concrete production, it has become an important choice for various types of concrete engineering applications. With the improvement of concrete construction technology, the preparation methods and application technologies of concrete admixtures have also been continuously expanded, and the types of admixt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B14/14C04B14/06
Inventor 张仲王自忠
Owner 张仲
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