چکیده مقاله
Calcium aluminate cement is a special type of cement that does not have some of the mostimportant disadvantages of Portland cement Calcium aluminate cement has some uniqueadvantages including high early strength, high resistance in acidic and chloride environments andhigh heat resistance However, due to its long term strength loss calcium aluminate cement is notwidely used in construction sector The strength loss occurs due to the conversion phenomenon,which is thermodynamically unavoidable in calcium aluminate cement This study aims at investigating the effect of pumice as a supplementary cementitious material onthe durability characteristics of calcium aluminate cement mortar Despite many studies on binaryand ternary Portland cement, binary and ternary calcium aluminate cement has rarely been studied In particular, the effect of pumice on the durability of this type of cement has not been studied,which can be considered an innovation of this study and even its results can be effective indeveloping standards for calcium aluminate cement In this study, pumice was used in substitution level of 5%, 15%, 25%, 40% and 60% of calciumaluminate cement and its effect on the durability of mixtures was investigated The results showthat the plain mixture has high compressive strength 33 MPa at one day; nonetheless byincreasing the ages up to 90 days it shows a decreasing trend due to the occurrence of theconversion phenomenon The Analyses indicate that Pumice has a very significant effect on thestrength by controlling the conversion phenomenon, and, more importantly, improves thedurability properties of the mixtures For instance, in the optimal pumice replacement level 40% , the chloride and electrical resistance improves 360% and 400% respectively in compare to plain mixture
کلیدواژهها
نویسندگان
A.R Rasekhisahneh
Ph D Student of the Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
M.A Dasti Rahmatabadi
Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran Department of Civil Engineering, Graduate University of Advanced Technology, Kerman, Iran
S.H Madani
Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
S. H Dehghan Manshadi
Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
شیوه ارجاع
Rasekhisahneh, A.R and Dasti Rahmatabadi, M.A and Madani, S.H and Dehghan Manshadi, S. H,1399,Investigating the effect of pumice as a supplementary cementitious material on the durability characteristic of calcium aluminate cement,Twelfth National Concrete Conference,Tehran
ارائهشده در
مجموعه مقالات دوازدهمین کنفرانس ملی بتن15 مهر 1399 · تهران