Portland cement-sulphate aluminum cement-gypsum-polymer composite waterproof mortar and preparation method thereof

Abstract

The invention discloses portland cement-sulphate aluminum cement-gypsum-polymer composite waterproof mortar and a preparation method thereof. The method comprises the following steps: weighing the following raw materials in parts by weight: 35-50 parts of portland cement, 12-21 parts of sulphate aluminum cement, 5-12 parts of gypsum, 7-18 parts of redispersible polymer powder, 13.5-19 parts of filler and 1-3 parts of additive, and then stirring until the powder is fully and evenly mixed, so as to prepare the powder of waterproof mortar; in construction, pouring the powder into an agitator, adding water according to a mass ratio of the powder to water being 1:(0.4-0.6), and agitating until uniform mucilage free of aggregation is generated, so as to obtain the waterproof mortar. The mortar disclosed by the invention has excellent waterproof plugging effect. In addition, the mortar also has the advantages of good anti-permeability, high bonding strength, low shrinkage rate and the like, is applicable to special engineering in cold winter or relatively cold weather, and meets the requirements of engineering on properties such as early strength performance and water resistance.

Description

technical field [0001] The invention relates to the field of preparation of construction engineering waterproof mortar materials, in particular to Portland cement-sulfoaluminate cement-gypsum-polymer composite waterproof mortar and a preparation method thereof. Background technique [0002] It has always been a difficult problem in construction technology to effectively solve the leakage of building structures and prolong the life of buildings. The existence and migration of water is often an important cause of damage to the performance of concrete and masonry structures, such as carbonation of concrete and mortar, corrosion of steel bars, freeze-thaw damage, and moldy walls are all related to the existence and migration of water. In addition to achieving waterproof and anti-seepage through a dense structure, the use of waterproof materials has become an indispensable means of waterproofing. Traditional waterproof materials include water-based and solvent-based asphalt-base...

AI Technical Summary

Problems solved by technology

[0004] However, the existing polymer cement waterproof mortar is mostly a two-component product of a single inorganic gel system, and the hydration reaction is incomplete in a low temperature environment, the early compressive strength of the product is low, the impermeability is poor, and the waterproof effect is not good. Its application is limited

Chinese invention patent application CN102503300 uses 5%-10% of butadiene-styrene copolymer redispersible latex powder with a glass transition temperature of 16°C to modify the cement-based waterproof material, but the construction performance at low temperature is not good, and the final Long setting time; U.S. Patent US8076396 uses sulfoaluminate cement as the inorganic gelling system and polyacrylate as the dispersant to achieve rapid hardening of the coating, which improves the fluidity of cement at low temperatures to a certain extent, but it is not very good Solve other performance problems at low temperature, such as adhesion performance, bending resistance, etc.

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