Hence research on ready mixed mortar with good workability, good ability of keeping workability, good durability, analyzing the problem in producing and quality control have important meaning on application and extension.

Additive was one of the key components for ready mixed mortar,it mainly affected improvement on water reduction,thickening and water retention,keeping consistency constant.

The result of study shows that variety and amount of polymer powder have influence on the bulk density,consistence and air content of fresh mortar in different degree.

Mechanism of modifying properties of dry-mixed mortar caused by calcined palygorskite clay;

Study on new thickening powder for dry-mixed mortar