Repair mortar for concrete slab and preparation method

Abstract

The invention provides repair mortar for a concrete slab and a preparation method. The mortar is prepared from the following components: sulphate aluminium cement, quartz sand, heavy calcium powder, paste attapulgite, kaolin, polyacrylamide, polyvinyl alcohol, graphene, lignosulfonate, glass fiber, a defoaming agent and an early strength agent. The preparation method comprises the steps of firstly performing modification reaction on the polyacrylamide, the polyvinyl alcohol and the graphene, and then uniformly mixing a reaction product with the rest components in batches, thus obtaining the mortar. When the repair mortar provided by the invention is applied to the field of buildings, better compatibility to building concrete is realized, and mechanical properties of higher bonding strength and the like are also realized; furthermore, the repair mortar has the characteristics of construction easiness and good effect, and has better application value.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a repair mortar for concrete slabs and a preparation method thereof. Background technique [0002] Concrete and reinforced concrete are widely used in various fields as the main building materials. During the long-term use of concrete structures, they are affected by factors such as heavy loads, freeze-thaw cycles, chloride ion penetration, surface abrasion, and erosion of corrosive media. Many concrete structures have cracked, peeled, and hollowed out, which greatly affects the service life of the project. my country is one of the countries with frequent earthquakes. The earthquake has a very large damage to the existing concrete buildings, including civil buildings, concrete pavements, bridge decks, and concrete in industrial plants. The damage to mortar and concrete is naturally very serious. . For the concrete structures damaged in the earthquake, if the repair o...

AI Technical Summary

Problems solved by technology

Among them, polymer repair materials use various polymers as cementing materials, which have outstanding advantages such as high bonding strength, short curing time, and good durability, but have poor compatibility with cement substrates and high cost; polymer modification Repairing materials use polymers to modify cement-based materials. Although the compatibility between repairing materials and cement-based materials is improved to a certain extent, the cost is too high, which affects the application of this repairing material; the current inorganic repairing materials are generally Portland cement repair mortar has the advantages of high strength and good compatibility, but has the problems of high viscosity, poor workability, low bonding strength and poor aesthetics