Application of viscosity reducing type polycarboxylate superplasticizer in preparation of tailing sand concrete

A technology of viscous polycarboxylate and concrete, which is applied in the field of preparation of tailings sand concrete and viscosity-reducing polycarboxylate superplasticizer, which can solve the problems of large void ratio, poor water retention, rough surface, etc.

CN109455975AActive Publication Date: 2019-03-12河北红墙新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-12

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Abstract

The invention provides concrete and also provides application of a viscosity reducing type polycarboxylate superplasticizer as shown in a formula (I) in preparation of tailing sand concrete. The mixedsand of tailing sand and machine-made sand is adopted and is matched with the viscosity reducing type polycarboxylate superplasticizer as shown in the formula (I) so as to overcome the technical defects of iron tailing sand concrete; the tailing sand and the machine-made sand are matched so as to adjust the sand grading and the fineness modulus; and the viscosity reducing type admixture is adopted so as to adjust the cohesiveness and flowability of the concrete, improve the workability of the concrete, especially the cohesiveness and water-retaining property of the concrete, as well as reducesegregation and weeping, so that the tailing sand concrete meeting construction requirements can be produced, and the utilization ratio of the iron tailing sand is promoted.
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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...

Examples

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 ...