The performance influence of flexible latex powder on concrete structure and repair mortar(RDP&VAE)

Whether it is the functional failure caused by the structural damage of the old concrete structure project, or the structure of the new concrete project due to various reasons caused by honeycomb, hemp surface and other defects, will affect the safety and use of the building, and affect people’s production and life.Therefore, it is very important to repair the damaged part of the coagulation ten structures, and the development of the concrete structure repair mortar is also imperative.Polymer cement mortar is a composite material, which combines the advantages of organic materials and inorganic materials, and has become the research hotspot of concrete structure repair mortar in recent years.

There are many types of polymer added components in the concrete structure repair mortar.Redispersed latex powder is one of the most important polymer components and is the largest organic component in the repair mortar composite system.

With the increase of glue powder mixing amount, the apparent density of mortar gradually decreases, the consistency value first increases sharply and then is maintained smoothly, the water retention rate increases linearly, and the condensation time gradually becomes longer.The increase of water retention rate is conducive to the repair of repair mortar in dry environment, even without wet maintenance; the extension of setting time helps to extend the operating time of repair mortar.

Rubber powder in low amount will make the compressive strength of mortar, then with the increase of the compressive strength gradually reduced, mortar folding strength and tensile bonding strength increases with the increase of glue powder increase after the trend, the influence of mortar strength> tensile bonding strength> compressive strength.

When the glue powder is low, the consistency value is large and the mortar viscosity is greatly improved; the compressive strength increases significantly and the tensile strength and tensile bonding strength are also improved to different degrees, and the mechanical properties are excellent.

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