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C30 tailing sand concrete and preparation method thereof

A technology of tailings sand and concrete, which is applied in the field of building materials, can solve the problems of large concrete slump loss, inability to meet underwater construction, and easy dispersion of concrete, so as to achieve difficult dispersion, increase hydrophobic effect, improve workability and resistance The effect of compressive strength

Inactive Publication Date: 2019-08-16
青岛中建富兴商砼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A large amount of iron tailings are mixed into the existing concrete, because the water absorption rate of iron tailings is relatively high, the surface is rough, and the porosity is large, so when the amount is large, the iron tailings are easy to absorb more water in the concrete. Free water causes greater slump loss and poor workability of concrete. At the same time, this large-volume iron tailings concrete cannot meet the requirements of underwater construction. During underwater construction, the concrete is easily dispersed and its strength is reduced. Therefore, it is a problem to be solved to develop a kind of C30 tailings sand concrete with good workability, low slump loss, and not easy to disperse in underwater construction.

Method used

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  • C30 tailing sand concrete and preparation method thereof
  • C30 tailing sand concrete and preparation method thereof
  • C30 tailing sand concrete and preparation method thereof

Examples

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Effect test

preparation example 1-3

[0042] The coal gangue powder in the preparation example 1-3 is selected from the coal gangue of Wangfenggang Coal Preparation Plant in Huainan City, Anhui Province. The main components (wt%) are 56.35% silicon dioxide, 32.79% aluminum oxide, 5.85% iron sesquioxide, and 3.11% calcium oxide. Magnesium oxide 1.18, the silane coupling agent is selected from the silane coupling agent of model KH-550 sold by Henan Weichen Chemical Products Co., Ltd.

preparation example 1

[0043] Preparation Example 1: Select coal gangue to remove impurities, soak it in water for 2 hours, dry and pulverize it until the average particle size is 3.0 μm; dissolve 1 kg of silane coupling agent with 8 kg of water, add 20 kg of coal gangue powder, and stir at 80 ° C for reaction. Washing, suction filtration, and drying at 110°C to obtain modified gangue powder.

preparation example 2

[0044] Preparation Example 2: Select coal gangue to remove impurities, soak it in water for 2.5 hours, dry and crush it to an average particle size of 3.3 μm; dissolve 1.3 kg of silane coupling agent with 9 kg of water, add 23 kg of coal gangue powder, and stir at 85°C for reaction , washed, suction filtered, and dried at 115°C to obtain modified gangue powder.

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Abstract

The invention discloses a C30 tailing sand concrete and a preparation method thereof. The C30 tailing sand concrete includes cement, sands, tailings sands, broken stones, water, fly ash, slag powder and an admixture; the tailing sands have a fineness modulus of 2.1-2.3 and a mud content of below 5%; the admixture is prepared by mixing a water reducer, a flocculant, a reinforcing component and modified bentonite according to a mass ratio of 1:(0.8-1.2):(4.5-5.5):(0.04-0.06); and the reinforcing component is prepared by mixing triethanolamine, polydimethylsiloxane and modified coal gangue powderaccording to a mass ratio of 1:(0.4-0.6):(1.2-1.5). The C30 tailing sand concrete of the invention has the advantages of good workability, small slump loss, and low dispersibility during underwater construction.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a C30 tailings sand concrete and a preparation method thereof. Background technique [0002] With the continuous heating up of the real estate industry and the extensive use of concrete in the construction industry, the demand for river sand resources is increasing, resulting in a large reduction in my country's sand resources, resulting in a substantial increase in the current concrete production cost, resulting in Unfair competition has brought difficulty to the quality control of the construction industry. Tailings are the waste after mineral processing and are the main component of industrial solid waste. A large amount of tailings sand not only occupies land, but also pollutes the environment with dust. At present, the comprehensive utilization rate of tailings in my country is only 7%. Therefore, tailings The comprehensive recycling of mines has been widely concer...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/06C04B18/12C04B18/08C04B18/141C04B24/24C04B24/2652C04B24/122C04B24/42C04B2103/302C04B24/2641C04B24/18C04B24/12
Inventor 董京峰
Owner 青岛中建富兴商砼有限公司
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