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A kind of concrete accelerator and preparation method thereof

A technology of quick-setting agent and concrete, applied in the field of concrete, can solve the problems of poor comprehensive performance, few product types, high price, etc., and achieve the effects of improving compressive strength, improving grinding efficiency and improving cement performance.

Active Publication Date: 2021-07-30
海南佳益混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-alkali (low-alkali) liquid accelerator developed in my country is still in its infancy, and there are problems such as few types of products, high prices, poor comprehensive performance, and chloride ions, which need further research

Method used

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  • A kind of concrete accelerator and preparation method thereof
  • A kind of concrete accelerator and preparation method thereof
  • A kind of concrete accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0035] Preparation Example 1 Preparation of Modified Alcoholamine Polymer Grinding Aid

[0036] Composition of raw materials (parts by weight): 12 parts of 2-methacrylic anhydride, 1 part of halloysite nanotube, 20 parts of triethanolamine, 0.5 part of sodium p-toluenesulfonate, 1 part of silane coupling agent, 5 parts of methacrylic acid, 0.1 parts of ammonium persulfate. The silane coupling agent is the compound of KH570 and KH560 according to the mass ratio of 1:1.

[0037] Preparation:

[0038] Put 2-methacrylic anhydride, halloysite nanotubes and triethanolamine into the reactor, add catalyst sodium p-toluenesulfonate and silane coupling agent, react at 100°C for 1 hour, add an equal volume of ethanol, filter to obtain Angstrom Triethanolamine acrylate is modified by rockite nanotubes, and an aqueous solution with a concentration of 30% is prepared, then an aqueous solution containing 15wt% methacrylic acid is added, after stirring and mixing evenly, the initiator ammon...

preparation example 2

[0039] Preparation Example 2 Preparation of Modified Alcoholamine Polymer Grinding Aid

[0040] Composition of raw materials (parts by weight): 35 parts of 2-methacrylic anhydride, 3 parts of halloysite nanotubes, 40 parts of triethanolamine, 1.5 parts of sodium p-toluenesulfonate, 3 parts of silane coupling agent, 10 parts of methacrylic acid, 0.5 parts of ammonium persulfate. The silane coupling agent is a compound of KH570 and bis(2-hydroxyethyl)-3-aminopropyltriethoxysilane in a mass ratio of 1:3.

[0041] Preparation:

[0042] Put 2-methacrylic anhydride, halloysite nanotubes and triethanolamine into the reactor, add catalyst sodium p-toluenesulfonate and silane coupling agent, react at 120°C for 2 hours, add an equal volume of ethanol, filter to obtain Angstrom Triethanolamine acrylate is modified by rockite nanotubes, and an aqueous solution with a concentration of 50% is prepared, then an aqueous solution containing 25wt% methacrylic acid is added, after stirring and...

preparation example 3

[0043] The preparation of preparation example 3 tackifier

[0044] Prepared by:

[0045] S1. Grinding the asbestos finely and performing ultrafine pulverization to obtain asbestos fine powder below 1000 mesh;

[0046] S2. Evenly disperse 5 g of the asbestos fine powder obtained in step S1 in 100 g of an ethanol solution containing 15 wt % sodium ethylate, heat to 40° C. and stir for 30 minutes, then filter with suction to obtain surface-treated asbestos fine powder;

[0047] S3. Add 15g of asbestos fine powder surface-treated in step S2 to 30g of ethanol containing 0.5wt% silane coupling agent KH550, heat to 50°C, and react for 1h, add 10g of sodium carboxymethylcellulose, and react while stirring After 30 minutes, filter with suction and dry to remove ethanol to obtain a thickener.

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Abstract

The invention proposes a concrete quick-setting agent, which is prepared from the following raw materials: aluminum sulfate, aluminum nitrate, phosphoric acid, ammonia water, halloysite nanotube modified alkanolamine polymer grinding aid, stabilizer, magnesium fluorosilicate , tackifier, water. The invention combines various coagulation-accelerating components, which can further shorten the setting time of shotcrete and improve the comprehensive performance of cement. It has a good coagulation-accelerating effect on ready-mixed concrete that has already undergone initial hydration, and can significantly shorten the coagulation of concrete. Time, improve the early strength, but also significantly improve the stability, durability and safety of concrete, and the cost is low. It is especially suitable for spraying construction of ready-mixed concrete for long-term and long-distance transportation.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a concrete quick-setting agent and a preparation method thereof. Background technique [0002] In the process of shotcrete construction, in order to improve the early strength, cohesive force, antifreeze and impermeability of concrete and reduce the amount of rebound, a variety of admixtures and admixtures are generally added, and the accelerator is one of them. Less admixtures. Advanced wet spraying technology is usually selected for the construction of large-scale shotcrete projects, and shotcrete constructed with wet spraying technology generally needs to be mixed with a certain amount of liquid accelerator. [0003] Admixtures that can promote the rapid setting and hardening of cement or concrete when mixed into concrete are called accelerators, and are widely used in anchoring and shotcreting support, plugging and emergency repair projects in wells, tunnels and other proje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B24/12C04B24/08C08F292/00C08F220/06C04B103/52C04B103/44C04B103/12
CPCC04B24/425C04B40/0039C04B40/0046C04B2103/0068C04B2103/12C04B2103/44C04B2103/52C08F292/00C04B22/148C04B22/126C04B22/06C04B22/165C04B24/383C04B24/085C04B24/128C04B24/08C08F220/06
Inventor 韩兰涛
Owner 海南佳益混凝土有限公司
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