Performances Study and Accelerating Mechanism Analysis of New-Type Alkali-Free Efficient Liquid Setting Accelerator

This paper introduces a new-type alkali-free and chlorine-free high performance liquid accelerated admixture. The accelerated agent is mainly composed of the following components: fluoride magnesium aluminum silicate is main accelerator, alcohol amine polymer is activator, and amide polymer is stabilizer. When dosage of the admixture is greater than 4%, the cement initial setting time is less than 5 min, the final setting time is less than 10 min, and the 28 day compressive strength ratio of mortar is more than 100%. The mechanism is the accelerating of agent on hydration of C 3 A and C 3 S. There are large hydration calcium flu silicate (11CaO·4SiO 2 ·CaF 2 ) and hydration calcium aluminates at the later stage of hydration.