China Mechanism of Rdp in Mortar

RDP and other binders (such as cement, hydrated lime, gypsum, etc.) and various aggregates, fillers and other additives (such as starch tunnels, lignocellulose, water-increasing agents, etc.) are physically mixed to make the dry-mixed mortar added After stirring in water, RDP particles are dispersed into water under the action of hydrophilic protective colloid and mechanical shear, and the time required for normal redispersion is very short.
With the increase in the amount of RDP, the entire system is developing towards plastics. In the case of high RDP dosage:
1. After curing, the polymer phase in the mortar gradually exceeds the phase of the inorganic hydration product, and the mortar undergoes a qualitative change.
2. The cured mortar becomes an elastomer after the change, and the hydration product of cement becomes a "filler"
3. The film formed by dispersing the re-distributed RDP on the interface plays another key role, namely, enhancing the adhesion to the contacted material.
This pair of difficult-to-stick surfaces, such as extremely low or non-absorbent surfaces (such as smooth concrete and cement material surfaces, steel plates, homogeneous bricks, vitrified brick surfaces, etc.) and organic material surfaces (such as EPS boards, plastics, etc.) ), Which is especially important.