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A modified coal gangue aggregate concrete

A technology of coal gangue and concrete, which is applied in the field of building materials, can solve the problems of poor concrete drying shrinkage performance and frost resistance performance, and achieve the effects of improving freeze resistance and drying shrinkage performance, fast reaction speed and high activity

Active Publication Date: 2020-04-24
江西新纪元混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is: Aiming at the problem of poor drying shrinkage performance and frost resistance performance of traditional concrete, a modified coal gangue aggregate concrete is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025]Add coal gangue aggregate and hydrochloric acid with a mass fraction of 10% into a single-necked flask at a mass ratio of 1:100, stir and mix for 2 hours at a speed of 500r / min to obtain a reaction solution, and then place the reaction solution in a refrigerator , freeze at -20°C for 2 hours, then dissolve at room temperature for 2 days, and freeze-thaw cycles 10 times to obtain a reaction solution, and then filter the reaction solution to obtain a treated coal gangue wet material and Acid leaching the filtrate, then washing the wet material of the primary treatment coal gangue with deionized water 5 times, and then placing the wet material of the primary treatment coal gangue after washing in a vacuum freeze-drying box to dry for 50 minutes to obtain the primary treatment coal gangue; In total, 30 parts of once-treated coal gangue, 10 parts of nano-iron powder and 100 parts of saturated sodium fluoride solution were added to a beaker, and the beaker was moved to an ultra...

example 2

[0027] In parts by weight, 100 parts of modified gangue crushed material, 40 parts of cement, 20 parts of fly ash, 20 parts of silica fume, 20 parts of slag, 60 parts of water, 30 parts of silane coupling agent, 10 parts of water reducing Add the agent into the mixer, and stir at a high speed of 1300r / min for 50min to obtain the modified gangue aggregate concrete. The cement is Portland cement. The slag is blast furnace slag. The model of the silane coupling agent is silane coupling agent KH-550. The water reducer is calcium lignosulfonate water reducer. The gangue crushed material is mixed with the following raw materials in parts by weight: 40 parts of coal gangue with a particle size of 0.08 mm, 50 parts of coal gangue with a particle size of 0.5 mm, and 40 parts of coal gangue with a particle size of 0.9 mm. The saturated sodium fluoride solution is a saturated sodium fluoride solution at a temperature of 22°C.

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Abstract

The invention discloses modified coal gangue aggregate concrete and belongs to the technical field of building materials. The modified coal gangue aggregate concrete is prepared by the following steps: taking coal gangue aggregate and hydrochloric acid to react; filtering, washing and drying to obtain first-time treated coal gangue and acid leaching filtrate; ultrasonically dispersing the pre-treated coal gangue, nano iron powder and a saturated sodium fluoride solution; filtering, washing and drying to obtain second-time treated coal gangue; carrying out high-temperature reaction on the second-time treated coal gangue and cooling to obtain third-time treated coal gangue; mixing the third-time treated coal gangue and the acid leaching filtrate and stirring and mixing; then dropwise addingammonia water and filtering and washing to obtain fourth-time treated coal gangue; adding the fourth-time treated coal gangue into a tubular furnace and carrying out high-temperature reaction; coolingto obtain modified coal gangue crushed aggregates; stirring and mixing the modified coal gangue crushed aggregates, cement, fly ash, silicon ash, slag, water, a silane coupling agent and a water reducing agent to obtain the modified coal gangue aggregate concrete. The modified coal gangue aggregate concrete provided by the invention has excellent anti-freezing and dry shrinkage performance.

Description

technical field [0001] The invention discloses a modified coal gangue aggregate concrete, which belongs to the technical field of building materials. Background technique [0002] Concrete, referred to as "concrete" for short: refers to the collective name of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, the term concrete refers to the cement concrete obtained by using cement as the cementitious material, sand and stone as the aggregate; mixed with water (may contain admixtures and admixtures) in a certain proportion, and stirred. Concrete, which is widely used in civil engineering. [0003] The ability of concrete to resist various destructive factors during use. The durability of concrete determines the life of concrete projects. It is an important performance of concrete, so it has been highly valued by people for a long time. In general, concrete has good durability. However, in cold area...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02C04B18/02
CPCC04B18/027C04B20/023C04B28/04C04B18/08C04B18/146C04B22/002C04B24/42C04B24/18C04B18/141C04B18/12C04B14/34C04B22/126
Inventor 邵俊英殷小祥张琳
Owner 江西新纪元混凝土有限公司
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