Efficient retarding and water reducing agent for cement concrete and preparation method of efficient retarding and water reducing agent

A retarding water reducer and cement concrete technology, applied in the field of water reducer, can solve the problems of accelerated concrete loss, reduced concrete strength, prolonged setting time, etc., to improve workability and fluidity, improve concrete structure, increase The effect of retarding effect

Inactive Publication Date: 2022-03-25
陈襄雨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in engineering applications, it is found that the commonly used carboxylic acid water reducer is not very compatible with cement concrete, which affects its excellent dispersion to a certain extent, and the dispersion retention is also affected.
In addition, high-strength concrete uses high-strength cement, high-gel materials, and silica fume. The hydration rate is fast, which intensifies the digestion of water, resulting in accelerated loss of concrete and increased viscosity, which causes concrete mixing, transportation, and pumping. There are a series of construction problems
Existing water reducers cannot meet the construction needs very well, and it is often necessary to combine water reducers with air-entraining agents, slump-retaining agents, and slow-release agents to achieve the desired effect, which will lead to complex construction procedures, prolonged coagulation time, and increased costs. Higher problems, more likely to reduce the strength of the concrete

Method used

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  • Efficient retarding and water reducing agent for cement concrete and preparation method of efficient retarding and water reducing agent
  • Efficient retarding and water reducing agent for cement concrete and preparation method of efficient retarding and water reducing agent
  • Efficient retarding and water reducing agent for cement concrete and preparation method of efficient retarding and water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-efficiency retarding water reducer for cement concrete, comprising the following raw materials in parts by mass: 80 parts of polyethylene glycol methyl ether methacrylate, 20 parts of methacrylic acid, 40 parts of 2-hydroxyphosphonoacetic acid, 10 parts of acid anhydride, 10 parts of phosphoric acid slow release agent, 2 parts of initiator, 3 parts of chain transfer agent, 150 parts of deionized water;

[0037] The preparation method of the water reducing agent comprises the following steps:

[0038] Step 1: Use 30ml / min of high-purity nitrogen to evacuate the air in the reactor, take mass parts of maleic anhydride and 2-hydroxyphosphonoacetic acid into the reactor, and use 30ml / min of high-purity nitrogen to ventilate again into the reaction kettle for 20 minutes; then the temperature was heated to 60°C, while stirring at a speed of 300r / min, the reaction was carried out for 1 hour, the stirring was stopped, and then naturally cooled to room temperature to obtai...

Embodiment 2

[0042] A high-efficiency retarding water reducer for cement concrete, comprising the following raw materials in parts by mass: 100 parts of polyethylene glycol methyl ether methacrylate, 30 parts of methacrylic acid, 70 parts of 2-hydroxyphosphonoacetic acid, Malay 20 parts of acid anhydride, 30 parts of phosphoric acid slow release agent, 3 parts of initiator, 5 parts of chain transfer agent, 300 parts of deionized water;

[0043]The preparation method of the water reducing agent comprises the following steps:

[0044] Step 1: Use 50ml / min of high-purity nitrogen to evacuate the air in the reactor, take mass parts of maleic anhydride and 2-hydroxyphosphonoacetic acid into the reactor, and use 50ml / min of high-purity nitrogen to ventilate again into the reaction kettle for 30 minutes; then the temperature was heated to 80°C, while stirring at a speed of 500r / min, the reaction was carried out for 2 hours, the stirring was stopped, and then naturally cooled to room temperature t...

Embodiment 3

[0048] A high-efficiency retarding water reducer for cement concrete, comprising the following raw materials in parts by mass: 90 parts of polyethylene glycol methyl ether methacrylate, 25 parts of methacrylic acid, 55 parts of 2-hydroxyphosphonoacetic acid, 15 parts of acid anhydride, 20 parts of phosphoric acid slow release agent, 2 parts of initiator, 4 parts of chain transfer agent, 200 parts of deionized water;

[0049] The preparation method of the water reducing agent comprises the following steps:

[0050] Step 1: Use 40ml / min of high-purity nitrogen to evacuate the air in the reactor, take mass parts of maleic anhydride and 2-hydroxyphosphonoacetic acid into the reactor, and use 40ml / min of high-purity nitrogen to ventilate again into the reaction kettle for 25 minutes; then the temperature was heated to 70°C while stirring at a speed of 400r / min for 1.5 hours, the stirring was stopped, and then naturally cooled to room temperature to obtain a phosphate ester modified...

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Abstract

The invention relates to the technical field of water reducing agents, in particular to an efficient retarding water reducing agent for cement concrete and a preparation method of the efficient retarding water reducing agent. Comprising the following raw materials in parts by mass: 80-100 parts of polyethylene glycol methyl ether methacrylate, 20-30 parts of methacrylic acid, 40-70 parts of 2-hydroxyphosphonoacetic acid, 10-20 parts of maleic anhydride, 10-30 parts of a phosphoric acid sustained release agent, 2-3 parts of an initiator, 3-5 parts of a chain transfer agent and 150-300 parts of deionized water. The water reducer disclosed by the invention has a good function of reducing the mixing water consumption, the complexing capability on calcium ions in cement is improved, meanwhile, the adsorption capability of the polycarboxylic acid water reducer and cement concrete can be improved, the dispersing capability of the water reducer on the concrete is improved, and the water reducer has a good delayed coagulation effect and can be used for preparing cement concrete. The workability and flowability of cement concrete are effectively improved, the concrete structure is improved, and the strength is improved.

Description

technical field [0001] The invention relates to the technical field of water reducing agents, in particular to a high-efficiency retarding water reducing agent for cement concrete and a preparation method thereof. Background technique [0002] With the development of national infrastructure construction, the demand and requirements for long-span, high-rise and high-strength concrete are getting higher and higher. The relatively low water-ash in high-strength concrete causes high viscosity and slow flow rate, which is not conducive to the spraying construction of concrete. Adding a suitable water reducing agent can effectively reduce the amount of water in concrete without causing the problem of high viscosity of concrete. In addition, the use of water reducing agent can improve the dispersion ability and dispersion retention ability of concrete to a certain extent. The invention of water reducing agent facilitates the construction of concrete and enhances the performance of...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08F290/06C08F220/06C08F230/02C08F2/38C04B24/24C04B103/30
CPCC08F290/062C08F2/38C04B24/246C04B2103/302C08F220/06C08F230/02
Inventor陈襄雨
Owner陈襄雨