Application of viscosity-reducing polycarboxylate water reducer in preparation of tailings sand concrete

A viscous polycarboxylic acid and concrete technology, which is used in the preparation of tailings sand concrete and viscosity-reducing polycarboxylate water reducer, can solve the problems of poor fluidity, poor continuity, uneven unevenness, and achieve good water reduction rate and collapse. The drop retention ability, the water reduction rate are not affected, and the viscosity reduction effect is excellent.

Active Publication Date: 2021-07-13
河北红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Large porosity, sharp edges and corners, rough and uneven surface, high water absorption, concentrated particle gradation distribution, and poor continuity, resulting in poor cohesion, poor water retention, poor fluidity, and easy segregation and bleeding of concrete produced with iron tailings

Method used

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  • Application of viscosity-reducing polycarboxylate water reducer in preparation of tailings sand concrete
  • Application of viscosity-reducing polycarboxylate water reducer in preparation of tailings sand concrete
  • Application of viscosity-reducing polycarboxylate water reducer in preparation of tailings sand concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0064] (1) Synthesis of viscosity-reducing active macromonomer D:

[0065] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and drop 30 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0066] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0067] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under normal tempe...

Embodiment 2

[0071] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0072] (1) Synthesis of viscosity-reducing active macromonomer D:

[0073] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol and 2 g of sodium hydride, stir under nitrogen protection, and add 30 mol dropwise at a constant speed at 90 ° C. , Ethyl 3-epoxy 3-phenylpropionate was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0074] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0075] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing a...

Embodiment 3

[0079] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0080] (1) Synthesis of viscosity-reducing active macromonomer D:

[0081] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 15 mol of ring Oxyalkane and 15mol ethyl 2,3 epoxy 3-phenylpropionate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0082] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0083] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent ...

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Abstract

The invention provides a kind of concrete, and the invention also provides the application of the viscosity-reducing polycarboxylate water reducer of formula (I) in the preparation of tailings sand concrete. The invention adopts tailings sand and machine-made sand mixed sand, and formula ( Ⅰ) The viscosity-reducing polycarboxylate superplasticizer is used together to overcome the technical defects of iron tailings sand concrete. Through the combined use of tailings sand and machine-made sand, the gradation and fineness modulus of the sand can be adjusted. The sticky admixture adjusts the cohesion and fluidity of concrete, improves the workability of concrete, especially the cohesion and water retention of concrete, reduces segregation and bleeding, and can produce tailings sand concrete that meets construction requirements. The utilization rate of iron tailings was promoted.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to the use of a viscosity-reducing polycarboxylate water reducer in preparing tailings sand concrete. Background technique [0002] my country's mines have a large amount of solid waste discharge, with an average utilization rate of about 43%, while the tailings utilization rate is only about 8%. With the vigorous development of the mining and dressing industry, the reserves of tailings will continue to increase. This is a secondary resource that has not been fully tapped and has great potential. If the tailings can be fully utilized, it will produce huge economic and environmental benefits. [0003] Facing the dilemma that natural sand resources are almost exhausted, developing machine-made sand and vigorously promoting the application of industrial waste is the most effective way to solve the problem, and it is also in line with the national policy of establishing a ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B28/00C04B103/30
CPCC04B24/32C04B28/00C04B2103/302C04B2201/50C04B18/08C04B18/141C04B14/02C04B14/06
Inventor 张小富白淑英
Owner 河北红墙新材料有限公司
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