Magnesium high-performance anti-cracking agent for concrete as well as preparation method and application thereof

A concrete and high-performance technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of limited use conditions, complex preparation methods of anti-cracking agents, etc., to increase the rate of hydration reaction, The effect of enhancing mechanical properties and increasing compactness

Active Publication Date: 2021-10-29
武汉三源特种建材有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this anti-cracking agent is complicated, and it is necessary to use a fluidized bed to atomize the paraffin liquid into micro-droplets; and this anti-cracking agent is only suitable for mold entry temperature above 25°C, temperature rise above 20°C, C50 and above Concrete structure of strength level, the use conditions have limitations

Method used

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  • Magnesium high-performance anti-cracking agent for concrete as well as preparation method and application thereof
  • Magnesium high-performance anti-cracking agent for concrete as well as preparation method and application thereof
  • Magnesium high-performance anti-cracking agent for concrete as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The magnesia high-performance anti-cracking agent for concrete provided in this embodiment, its raw materials include lightly burned MgO clinker 54wt%, phosphorus slag 31wt%, cinder 10wt%, quartz sand 2wt%, calcium chloride 2wt%, new heat of hydration Absorbent 1wt%;

[0038] The preparation method of the novel heat-of-hydration absorbent is:

[0039] S1. the maleic anhydride and sodium thiocyanate that the molar ratio is 7:1 are mixed, add the water of 1.5 times of the total mass of maleic anhydride and sodium thiocyanate to be mixed with solution;

[0040] S2. under the atmosphere of nitrogen, be that the sodium benzenesulfonate solution of 32% is added dropwise in the solution of S1 gained by mass percent concentration, stir while heating while dropping, the quality of the sodium benzenesulfonate that is added dropwise is 0.5% of the total mass of the reaction solution; the temperature is raised to 60° C., the reaction is kept for 2 hours, and the novel hydration he...

Embodiment 2

[0044] The magnesia high-performance anti-cracking agent for concrete provided in this embodiment differs from Example 1 in that its raw materials include 51wt% of lightly burned MgO clinker, 34wt% of phosphorus slag, 10wt% of cinder, 1.7wt% of quartz sand, chlorine Calcium 2wt%, new hydration heat absorber 1.3wt%.

Embodiment 3

[0046] The magnesia high-performance anti-cracking agent for concrete provided in this embodiment differs from that of Example 1 in that its raw materials include lightly burned MgO clinker 63wt%, phosphorus slag 29.5wt%, cinder 5wt%, quartz sand 1wt%, chlorine Calcium 1wt%, new hydration heat absorber 0.5wt%.

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Abstract

The invention discloses a magnesium high-performance anti-cracking agent for concrete as well as a preparation method and application thereof. The magnesium high-performance anti-cracking agent is prepared from the following raw materials of: 50 to 63 weight percent of light calcined magnesia clinker, 21 to 34 weight percent of phosphorus slag, 5 to 10 weight percent of coal slag, 1 to 3 weight percent of quartz sand, 1 to 2 weight percent of early strength agent and 0.5 to 1.3 weight percent of novel hydration heat absorbent. The light calcined magnesia clinker is formed by calcining magnesite, an iron material and bauxite at high temperature. The preparation method of the novel hydration heat absorbent comprises the following steps of: mixing maleic anhydride and sodium thiocyanate in a molar ratio of (7-9): 1; adding water to form a solution; dropwise adding a sodium benzenesulfonate solution in a nitrogen atmosphere; heating to 55-65 DEG C, carrying out heat preservation reaction for 2 hours; and cooling and drying to obtain the novel hydration heat absorbent. The anti-cracking agent disclosed by the invention has the functions of compensating concrete shrinkage, enhancing the mechanical property of concrete and absorbing cement hydration heat, and fundamentally improves the anti-cracking performance of the concrete material.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a magnesium high-performance anti-cracking agent for concrete, a preparation method and application thereof. Background technique [0002] Concrete cracks have always been a problem in the field of construction engineering. Because it reduces the durability of concrete and endangers engineering structures, it has always troubled the design, construction and material research and development personnel. How to effectively solve concrete cracks, we must first understand the types and causes of concrete cracks. Cracks caused by temperature changes and shrinkage cracks are two major types of cracks related to concrete performance. Shrinkage cracks can be divided into plastic shrinkage cracks, drying shrinkage cracks, autogenous shrinkage cracks, carbonization shrinkage cracks, etc. Cracks caused by temperature changes are cement shrinkage cracks. When the cementitious ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B28/04C07C331/04
CPCC04B40/0039C04B24/16C04B28/04C07C331/04C04B2201/50C04B22/066C04B22/0006C04B14/06C04B2103/10C04B18/08C04B14/02C04B2103/302Y02W30/91
Inventor 纪宪坤涂博王海龙苑立东
Owner 武汉三源特种建材有限责任公司
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