Redispersible polymer powder RDP/VAE is thick layer of plaster base self-leveling mortar performance is an important additive, through test Redispersible polymer powder RDP/VAE on thick layer of the influence of the physical and mechanical properties of gypsum base self-leveling mortar, and through microscopic analysis revealed Redispersible polymer powder RDP/VAE to improve mechanical properties of gypsum base self-leveling mortar action principle, explain Redispersible polymer powder RDP/VAE in the role of gypsum based self-leveling huge.
Redispersible polymer powder RDP/VAE is a widely used organic binder which can improve the properties of gypsum based building materials. The experimental results show that the initial fluidity of self-leveling mortar of thick gypsum base increases first and then decreases with the increase of the mixing amount of glue powder. The reason is that the glue powder has a certain viscosity in dissolved water. When the mixing amount is low, the increase of the viscosity of slurry improves the suspension ability of slurry to filler, which is beneficial to the flow of slurry. When the content of rubber powder continues to increase, the increase of slurry viscosity leads to the increase of slurry viscosity and the decrease of fluidity. The amount of glue powder has little effect on the 20min fluidity of mortar.
Redispersible polymer powder RDP/VAE as a kind of organic binder, the intensity of development depends on the slurry water evaporation, bond strength, film forming oven dry conditions moisture evaporation, gypsum based self-leveling mortar powder can form a continuous film, have a good bond and oven dry strength of gypsum based self-leveling mortar with powder content increases.
Without adding Redispersible polymer powder RDP/VAE have a lot of gypsum based self-leveling mortar bar, columnar dihydrate gypsum crystals and irregular packing Between dihydrate gypsum crystals and dihydrate gypsum crystals and crisscross overlap between packing together, through irregular tightly packed together make gypsum based self-leveling mortar strength, added Redispersible polymer powder RDP/VAE gypsum based self-leveling mortar, Redispersible polymer powder RDP/VAE on the formation of gypsum based self-leveling mortar filamentous connection, the dihydrate gypsum crystals and packing, organic bridge formed between crystals and crystal, organic film is formed on the dihydrate gypsum crystals, the overlapping parts between dihydrate gypsum crystals packages and connection, to increase the cohesion of gypsum based self-leveling mortar and cohesive force, Improve the strength of gypsum based self-leveling mortar Redispersible polymer powder RDP/VAE in a mortar with a membranous, can improve the cohesion of dry mortar and bond strength, powder between dihydrate gypsum crystals and packing film forming matter of dihydrate gypsum crystals and effective bond is formed between filler and improve the cohesion between the dihydrate gypsum crystals and packing, Thus, the bond strength of gypsum base self-leveling mortar is improved macroscopically.