Dispersible mechanism of reparable powder in mortar

Abstract: Shandong chuangyao Biotechnology Co., Ltd. analyzed the mechanism of polymer redispersible latex powder in repair mortar through proportioning test and electron microscope test.

In recent years, cement concrete buildings in most areas of China are seriously damaged. Because of the huge cost of reconstruction of these damaged buildings, and the shutdown of buildings will cause huge economic losses in the living and production areas. Therefore, it is very important to repair the damaged cement concrete buildings. Polymer cement-based repair mortar is often used in repairing damaged buildings. Shandong chuangyao biotechnology, through the experimental study on the performance of different composite cementitious systems, formulated the benchmark ratio of cementitious materials, selected chuangyao brand dry powder mortar admixture to prepare polymer modified cement-based repair mortar.

Shandong chuangyao biotechnology has defined the mix proportion of cementitious materials in repair mortar. The results show that when the proportion of aluminate in the cement system is 10%, the comprehensive performance of the cement system is the best. The test results of silicate sulphoaluminate anhydrite composite system show that the comprehensive performance is the best when the proportion of ordinary portland cement is 10% in the sulfur rich aluminate cement system, and the comprehensive performance is the best when the proportion of sulphoaluminate cement clinker is 9%.

When different mineral admixtures are added, different comonomer redispersible latex powder is used to modify repair mortar. The results show that the basic properties of the repair mortar mixed with ground mineral powder are better than those of fly ash and reference mortar; the bond strength and flexibility of the repair mortar increase with the increase of the content of redispersible latex powder. At the same level, it is found that the influence of different redispersible latex powder on the bond strength of repair mortar is b > a > C > D. Then add superplasticizer and defoamer into the repair mortar, change the sand cement ratio of the repair mortar, and test the basic performance of the repair mortar. The results show that: the addition of defoamer and superplasticizer can significantly improve the flexural strength and compressive strength of repair mortar; with the increase of lime sand ratio, the flexural strength, compressive strength and bond strength of repair mortar gradually increase.

The microstructure of redispersible latex powder in repair mortar is analyzed by SEM. The addition of redispersible latex powder makes the structure of repair mortar compact, and exists in the repair mortar in the form of polymer film and chemical bond, which improves the bonding strength, flexural strength and bond strength of repair mortar, so as to greatly enhance the durability of mortar, thus increasing the durability of mortar The service life of the building.

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