Study on Physical Properties of Cement Pastes Modified with HPMC and EVA
Cellulose ethers and redispersible polymer powders are common admixtures in dry-mixed mortars. The researches on mechanical properties of hydroxypropylmethyl cellulose (HPMC) and ethylene-vinyl acetate redispersible polymer powder (EVA) in cement pastes are still needed. Different from early researches that the mixing amount of HPMC in mortars being about 0.5％, properties of mortars with mixing amount of HPMC from 0 to 5‰ at constant of EVA were studied. It is shown that when the W/C increases at constant of the HPMC/C and the EVA/C, the setting time and fluidity increase while the compressive strength decreases. When the EVA/C increases by keeping the W/C and the HPMC/C constant, the compressive strength decreases while the fluidity and setting time increase. Keep the W/C and the EVA/C constant, the fluidity and the compressive strength decreases while initial setting time and final setting time increase when the HPMC/C increases. Linear positive correlation is found between the setting time of cement pastes and the HPMC/C, while logarithmical correlation is found between the fluidity of cement pastes and the HPMC/C. When the HPMC/C is less than 1.2 ‰, the setting time increases slowly, the fluidity decreases quickly, while the compressive strength decreases slowly. When the HPMC/C is higher than 1.2 ‰, the setting time increases quickly, the fluidity decreases slowly, while the compressive strength decreases quickly.
HPMC EVA setting time fluidity compressive strength
Jinmei Li Shiyun Zhong
School of Material Science and Engineering, Tongji University Shanghai 200092, China School of Material Science and ngineering, Tongji University Shanghai 200092, China
国际会议
6th Asian Symposium on Polymers in Concrete(第六届亚洲聚合物混凝土国际会议)
上海
英文
440-446
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）