High-early-strength-type alkali-free liquid accelerator and preparation method and application thereof

An early-strength, quick-setting agent technology, applied in the field of building material admixtures, can solve the problems of shortening the initial and final setting time of cement, reducing shotcrete, endangering construction safety, etc. , the effect of easy operation

Active Publication Date: 2019-08-09
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of fluoride can significantly shorten the initial and final setting time of cement, and reduce the rebound of shotcrete. However, the biggest problem faced by this type of accelerator is that the early strength is low, and the compressive strength of some products in one day is even only 2~ 3MPa, seriously endangering construction safety

Method used

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  • High-early-strength-type alkali-free liquid accelerator and preparation method and application thereof
  • High-early-strength-type alkali-free liquid accelerator and preparation method and application thereof
  • High-early-strength-type alkali-free liquid accelerator and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-early-strength non-alkali liquid quick-setting agent is composed of the following raw materials in weight percentage.

[0035] Polyaluminum sulfate: 40%,

[0036] Metakaolin: 10%,

[0037] Nano silica sol: 15%,

[0038] N,N-Dimethylethanolamine: 6%,

[0039] Organic acids: 4%,

[0040] Thickener: 0.05%,

[0041] Dispersant: 0.05%,

[0042] Water: 24.9%

[0043] The above-mentioned raw materials are prepared according to the above-mentioned preparation method to obtain a high-early-strength type alkali-free liquid accelerator.

Embodiment 2

[0045] A high-early-strength non-alkali liquid quick-setting agent is composed of the following raw materials in weight percentage.

[0046] Polyaluminum Sulfate: 55%,

[0047] Metakaolin: 5%,

[0048] Nano silica sol: 5%,

[0049] Diethylene glycol amine: 4%,

[0050] Organic acids: 3%,

[0051] Thickener: 0.01%,

[0052] Dispersant: 0.01%,

[0053] Water: 27.98%.

[0054] The above-mentioned raw materials are prepared according to the above-mentioned preparation method to obtain a high-early-strength type alkali-free liquid accelerator.

Embodiment 3

[0056] A high-early-strength non-alkali liquid quick-setting agent is composed of the following raw materials in weight percentage. Polyaluminum sulfate: 50%,

[0057] Metakaolin: 8%,

[0058] Nano silica sol: 10%,

[0059] N-Methyldiethanolamine: 3%,

[0060] Organic acid: 1%,

[0061] Thickener: 0.03%,

[0062] Dispersant: 0.02%,

[0063] Water: 27.95%.

[0064] The above-mentioned raw materials are prepared according to the above-mentioned preparation method to obtain a high-early-strength type alkali-free liquid accelerator.

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Abstract

The invention relates to a high-early-strength-type alkali-free liquid accelerator and a preparation method and application thereof, and belongs to the technical field of additives of building materials. The accelerator is prepared from, by weight, 40-50% of polyaluminium sulfate, 5-10% of metakaolin, 5-15% of nanometer colloidal silica, 3-6% of alcohol amine, 1-4% of organic acid, 0.01-0.05% of athickening agent, 0.01-0.05% of a dispersion agent and the balance water. On the basis of meeting the national standard of <accelerators used for shotcrete> (GB/T35159-2017), the accelerator can effectively improve the compressive strength of cement mortar after one day, the compressive strength reaches 20 MPa or above, and the compressive strength of partial cement mortar can even reach 25 MPa or above after one day.

Description

technical field [0001] The invention relates to the technical field of building material admixtures, in particular to a high-early-strength alkali-free liquid accelerator and its preparation method and application. Background technique [0002] Accelerator, as an indispensable admixture in shotcrete construction, plays an important role in accelerating the setting and hardening of cement and reducing the rebound of shotcrete. It is widely used in tunnel construction and rapid repair of mortar. With the continuous advancement of infrastructure construction at home and abroad, the amount of accelerators is increasing. However, there are various types of accelerators currently used in engineering. Powder accelerators are the earliest accelerators put into use. Although they are cheap and have good coagulation-accelerating effects, they are seriously polluted by dust and poor in environmental protection during construction. Promote apps. [0003] With the emergence of the wet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/00C04B22/06C04B24/122C04B24/04C04B24/383C04B2103/302
Inventor 顾本庆陈小龙钟开红孙申美熊旭锋
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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