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Method for inhibiting alkali activity of artificial fine siliceous rock aggregate

A technology of siliceous rock and fine aggregate, which is applied in the field of building materials to achieve the effects of improving mechanical strength, economic benefits, and widening the scope of use

Pending Publication Date: 2022-05-10
广西壮族自治区水利科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of alkali activity reaction of siliceous rock, the present invention provides a method for inhibiting the alkali activity of artificial fine aggregate of siliceous rock

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for inhibiting alkali activity of siliceous rock artificial fine aggregate, the mortar used in the inhibition method is prepared from the following raw materials in parts by weight: 900 parts of siliceous rock sand, 36 parts of metakaolin, 36 parts of fly ash 48 parts, 48 ​​parts of slag, 280 parts of P.O42.5 ordinary Portland cement and 188 parts of water.

[0023] The siliceous rock sand is sieved into 5 grades, which are 5-2.5mm, 2.5-1.25mm, 1.25-0.63mm, 0.63-0.315mm, 0.315-0.16mm, and the aggregate mass percentages are 10%, 25 %, 25%, 25%, 15%.

Embodiment 2

[0025] A method for inhibiting alkali activity of siliceous rock artificial fine aggregate, the mortar used in the inhibition method is prepared from the following raw materials in parts by weight: 900 parts of siliceous rock sand, 36 parts of metakaolin, 36 parts of fly ash 48 parts, 48 ​​parts of slag, 280 parts of P.O42.5 cement and 188 parts of water.

[0026] The siliceous rock sand is sieved into 5 grades, which are 5-2.5mm, 2.5-1.25mm, 1.25-0.63mm, 0.63-0.315mm, 0.315-0.16mm, and the aggregate mass percentages are 10%, 25 %, 25%, 25%, 15%.

Embodiment 3

[0028] A method for inhibiting alkali activity of siliceous rock artificial fine aggregate, the mortar used in the inhibition method is prepared from the following raw materials in parts by weight: 900 parts of siliceous rock sand, 48 parts of metakaolin, 36 parts of fly ash 36 parts, 36 parts of slag, 280 parts of P.O42.5 cement and 188 parts of water.

[0029] The siliceous rock sand is sieved into 5 grades, which are 5-2.5mm, 2.5-1.25mm, 1.25-0.63mm, 0.63-0.315mm, 0.315-0.16mm, and the aggregate mass percentages are 10%, 25 %, 25%, 25%, 15%.

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Abstract

The invention discloses a method for inhibiting alkali activity of siliceous rock artificial fine aggregate. Mortar adopted in the inhibiting method is prepared from the following raw materials in parts by weight: 900 to 1000 parts of siliceous rock sand, 100 to 140 parts of a multi-element active material, 250 to 300 parts of cement and 170 to 200 parts of water, the multi-element active material is composed of metakaolin, fly ash and slag. According to the method disclosed by the invention, metakaolin, fly ash and slag are adopted as multi-element active materials to replace part of a cementing material to be mixed into the concrete, so that the obtained mortar can reduce the total alkali content in the concrete, improve the problems of cracking, expansion and the like caused by siliceous rock, effectively delay or inhibit the alkali active reaction of silicon-alkali active aggregate, and improve the performance of the concrete. The application range of the siliceous rock aggregate is widened, the mechanical strength of the mortar can be improved, the raw materials are sufficient, economical and practical and convenient to purchase, and the siliceous rock aggregate has a great positive effect on water conservancy projects when being widely applied to projects.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for inhibiting alkali activity of siliceous rock artificial fine aggregate. Background technique [0002] Silica rock refers to rocks with a SiO2 content of 70% to 80%, and does not include quartz sandstone and quartzite produced by mechanical deposition. Silica rock belongs to carbonate stone in sedimentary rock, is an alkali active mineral, and is less distributed in the world. Because siliceous rock is an aggregate with high alkali activity, it is prone to alkali-aggregate reaction (AAR) when it is mixed into concrete. AAR can be divided into two categories according to the reaction mechanism: alkali-silicate reaction (ASR) and alkali-carbonate reaction (ACR), and siliceous rocks belong to carbonate rocks, SiO 2 The content of siliceous rock is very high, so the choice of siliceous rock as the fine aggregate of concrete will mainly cause ASR in the dam. ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/068C04B14/106C04B18/08C04B18/141
Inventor 陈建国顾业莲陈春刘鲁强黄卓杰黄小兵甘福朱芳坛陈美琴张协成杜念陈耿
Owner 广西壮族自治区水利科学研究院