16382

14606

كارشناسي ارشد

شيمي كاربردي

اصفهان : دانشگاه صنعتي اصفهان

1399

سيزده، 112ص.: مصور، جدول، نمودار

محمد ديناري، حسن حدادزاده

علي اله وردي

علي حسين كيانفر، محمد محسن مؤمني

1399/12/26

كتابنامه

شيمي

شيمي

1399/12/26

2681997

550 Composite cement interaction between blast furnace slag of Isfahan Steel Company natural pozzolan of Rafsanjan in Portland cement Mohammad Reza Rouhollahi mr roohallahi@gmail com 2 March 2021 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors M Dinari Assoc Prof dinari@iut ac ir H Hadadzadeh Prof hadad@iut ac ir AbstractComposite cements have several technical environmental and economic advantages so in this study wediscuss the properties of cement composed of two raw materials of granulated blast furnace slag from IsfahanSteel Company GGBFS and Rafsanjan mine pozzolan These two mineral additives were mixed withPortland cement type 2 of the Sepahan Cement Company and limestone which are the main components ofthis composite cement To study the interaction of two main additives in the composite cement severalchemical and physical tests were performed on these materials based on the international standards At first their chemical properties activity and physical properties of the samples were determined Eight cementmixtures were then prepared from these materials and the physical and mechanical properties of the preparedcements were measured According to the results of compressive strength during 1 to 90 days mortar and dueto the fluidity and setting of the fresh mortar the proposed composition typical mix including 20 slagpowder 10 pozzolan powder and 2 5 limestone powder was selected for additional studies The cementpaste of this mixture and the control cement slag cement 30 slag and pozzolanic 30 pozzolanic werecuring for 120 days After the hardening step the samples were prepared and the SEM XRD TGAcharacterizations were performed on them The obtained results revealed that the composite cementcontaining slag and pozzolan have a positive effect on each other along with proper resistance of the slagand pozzolan against the chemical attack The slag improves the ultimate and long term compressivestrength of the composite cement gives a better flow to the mortar and possesses a less permeability whilepozzolan performs better in the initial strength setting time and grind ability The microscopic studies andTGA test also revealed that the pozzolan additive reduces the amount of Portlandite composite cement paste cement vulnerability to chemical attacks The study of crystals by XRD indicated that the slag possessesfew crystals whereas in the XRD patterns numerous pozzolanic crystals were observed which reduce thecompressive strength in the composite cement The SEM images and EDAX elemental decomposition alsodisplayed that the pozzolanic crystals in the composite cement did not react with water after 120 days withoutany residual change The experimental results revealed that two used materials possess positive effects on theproperties of composite cement and improve the capabilities of cement Key wordsPortland cement Composite Cement Slag GGBFS Natural Pozzolan SEM TGA

محمد ديناري، حسن حدادزاده

علي اله وردي

علي حسين كيانفر، محمد محسن مؤمني