A Study on the Dispersion Effects and Slump for Elapsed Time of Cement Admixed with Naphthalene Sulfonated Condensate and Maleic Anhydride Copolymer

나프탈렌술폰산축합물과 무수말레인산계 공중합체를 첨가한 시멘트의 분산효과 및 경시변화에 관한 연구

Naphthalene sulfonated condensatd(NSF) has been widely using for the superplasticizing of ement and concrete. But NSF has a very large mobility loss with elapsed tiom. To retain mobility of NSF during a certain time, maleic anhydride and acrylic acid copolymer(MA) was polymerized and mixed with NSF in order to perpare admixture holding mobility-retention property of cement. By applying this admixture for ement paste, we examined the fluidity and mobility retention property as a function to elapsed time and measured the compressive strength of mortar with curing time. As a result, NSF containing 20wt% of MA showed very excellent fluidity and mobility-retention property. These properties were affected by the added amount of admixture and the ratio of water to cement.