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Macroporous concrete containing low grade recycled aggregates and preparation method of concrete

A technology of macroporous concrete and recycled aggregate, which is applied in the field of macroporous concrete, macroporous concrete and its preparation, which can solve the problems of discarding aggregates and being unable to be used as macroporous concrete, etc., to reduce pH value and inhibit hydration Speed, strong retarding effect

Active Publication Date: 2014-10-01
北京东方建宇混凝土科学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem in the prior art that low-quality recycled aggregates cannot be discarded as aggregates of macroporous concrete, a macroporous concrete containing low-quality recycled aggregates is provided

Method used

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  • Macroporous concrete containing low grade recycled aggregates and preparation method of concrete

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Embodiment 1

[0029] In this example, the raw material composition of macroporous concrete containing low-quality recycled aggregate includes, P.O42.5 cement 288kg / m 3 , water 89kg / m 3 , additional water 64kg / m 3 , low-quality recycled aggregate 656kg / m 3 , carboxymethyl starch 0.86kg / m 3 , Glucose 0.29kg / m 3 , wherein the particle size of the low-quality recycled aggregate is 5-16mm, and the bulk density is 700kg / m 3 .

Embodiment 2

[0031] In this example, the raw material composition of macroporous concrete containing low-quality recycled aggregate includes, P.O42.5 cement 310kg / m 3 , water 90kg / m 3 , additional water 66kg / m 3 , low-quality recycled aggregate 681kg / m 3 , starch sulfate 3.1kg / m 3 , sucrose 0.22kg / m 3 , wherein the particle size of the low-quality recycled aggregate is 5-16mm, and the bulk density is 700kg / m 3 .

Embodiment 3

[0033] In this example, the raw material composition of macroporous concrete containing low-quality recycled aggregate includes, P.O42.5 cement 340kg / m 3 , water 92kg / m 3 , additional water 69kg / m 3 , low-quality recycled aggregate 709kg / m 3 , a mixture of carboxymethyl starch and starch thioester (mass ratio 1:1) 2.72kg / m 3 , calcium sugar 1.36kg / m 3 , wherein the particle size of the low-quality recycled aggregate is 5-16mm, and the bulk density is 800kg / m3 .

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Abstract

The invention discloses macroporous concrete containing low grade recycled aggregates. The macroporous concrete containing low grade recycled aggregates is prepared from the following raw materials: cement, water, low grade recycled aggregates, modified starch and a sugar retarder, wherein the grain size of the low grade recycled aggregates is 5-16mm, and the bulk density is 700-900kg / m<3>. The macroporous concrete containing low grade recycled aggregates is further prepared from additional water, the use level of which is calculated according to the follow formula: delta W=mgr*wgr, wherein delta W is the use level of the additional water of the macroporous concrete containing low grade recycled aggregates; mgr is the use level of the low grade recycled aggregates and wgr is 1h water absorption of the low grade recycled aggregates. According to the invention, the grade recycled aggregates are applied to preparation of the macroporous concrete, so that the mixture state satisfies the using demand under the condition that an additive in an extra amount is not added by virtue of adjusting the raw materials and matching with the sugar retarder and modified starch.

Description

technical field [0001] The invention relates to a macroporous concrete, in particular to a macroporous concrete containing low-quality recycled aggregate and a preparation method thereof, belonging to the technical field of building material preparation. Background technique [0002] Macroporous concrete is a kind of light concrete made of coarse aggregate and cement. According to the type of aggregate used, it can be divided into ordinary macroporous concrete and light aggregate macroporous concrete. The former is made of ordinary crushed stones, pebbles or hard slag, and is mainly used for load-bearing and thermal insulation external walls; the latter is made of light aggregates such as ceramsite, pumice, broken bricks, etc., and is usually used for non-load-bearing and load-bearing thermal insulation exterior walls. In recent years, with the continuous development of the construction industry, the demand for concrete has continued to increase, making the above-mentioned ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/00C04B24/38C04B24/10C04B18/16
CPCY02W30/91
Inventor 段遵莉武俊宇王安岭赵玉芳邢书瑄张京涛
Owner 北京东方建宇混凝土科学技术研究院有限公司
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