Non-fluidity rapid-hardening strong-cohesive-force phosphate cement repairing material and preparation method thereof

Abstract

The invention belongs to the technical field of the composite material, and particularly relates to a non-fluidity rapid-hardening strong-cohesive-force phosphate cement repairing material and a preparation method thereof. The non-fluidity rapid-hardening strong-cohesive-force phosphate cement repairing material comprises the following raw materials by weight percentage: 20%-40% of sand, 5%-12% of ammonium dihydrogen phosphate, 10%-25% of magnesium oxide, 2%-8% of coal ash, 30%-60% of rubber powder, 6%-10% of silica fume, 0.35%-0.6% of a polycarboxylate superplasticizer, 1%-5% of sodium silicate, 1.5%-2% of polypropylene fiber, 0.5%-2% of a retarder, and 8%-10% of water. The method is used as the repairing material for the special positions of the baseboard of a bridge or the standing face of buildings which is damaged, and the repairing effect is remarkable.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a non-fluidity quick-setting strong cohesion phosphate cement repair material and a preparation method thereof. Background technique [0002] In recent years, a large number of reinforced concrete structures have sprung up, and various durability diseases of concrete structures have appeared. When the diseases appear on the bridge floor or the building facade, they need to be repaired in time. Due to the particularity of the repaired parts, As the difficulty of repair increases, the repair material must have the characteristics of no fluidity, strong cohesive force, quick setting, no shrinkage, crack resistance, and high early strength. [0003] Many researchers have researched and developed magnesium phosphate cement-based materials. For example, Yang Nan systematically studied water-cement ratio, curing conditions, interface humidity, interface treatment methods, ...

AI Technical Summary

Problems solved by technology

The above-mentioned repair materials all have the characteristics of short setting time, high early strength, dry shrinkage (good volume stability), good performance matching with old concrete, and high bonding strength; however, special for bridge floor or building facade After the location is damaged, the repair material needs to overcome its own gravity and bond well with the original repair surface, have good crack resistance, no fluidity, no shrinkage, fast setting and rapid hardening, etc. So far, there is no repair material The fundamental reason for the repair of this special position is that there is no repair material with ideal performance and reasonable technology to deal with the problems of bridge floor or building facade disease.

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