8867

8228

كارشناسي ارشد

سازه هاي هيدروليكي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1392

سيزده،91ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

كياچهربهفرنيا

27/2/93

محمدرضا افتخار، حسين تاجمير رياحي

مهندسي عمران

ID8228

92 A study on application of alkali activated slag concrete in hydraulic structures Reza Mohebi r mohebi@cv iut ac ir January 22 2014 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr Kiachehr Behfarnia kia@cc iut ac ir Email address Abstract Dams and the related hydraulic structures are known as long servicing life structures Theirmaintenance costs are high so their durability is an important issue Concrete abrasion is one of themost important factors in threatening the durability of hydraulic structures Because of the highconception of concrete and highly requirement of cement production concentration onenvironmental damaging effects seems to be essential Due to environmental issues revisions inconcrete production and research in relation to the utilization of new technologies for themanufacture of concrete are obvious One of the strategies to reduce cement consumption andnegative impacts associated with its production is partial replacement of cement in concrete withpozzolanic materials such as metakaolinite fly ash granulated blast furnace slag and etc Alkali activated slag concrete is produced through the activation of blast furnace slag with alkalinesolution which is compatible with the environment In this study we focus on application of alkali activated slag concrete in hydraulic structures Alkali activated slag concrete is a mixture of activated slag by alkaline solution containing sodiumhydroxide sodium silicate and conventional aggregates gaining strength quickly and has highlyultimate strength Optimum concrete mixture design achieving maximum strength and minimumhydraulic abrasion is obtained by using Taguchi experimental method Effective tests on duriabiltyof concrete used in hydraulic structures such as wear resistance permeability and water absorptionwere carried out on specimens made of alkali activated slag concrete The most convenient methodof curing and optimal percent of zeolites addition to improve the mechanical properties of alkali activated slag concrete has also been proposed Based on the results heat curing accelerates theprocedure of obtaing ultimate strength of concrete At the early age using the plastic cover on theheat treated leads to increase compressive strength reduce permeability and water absorption Inaddition water curing casued the most ultimate compressive and abrasion strength As a result suitable percentages of zeolite replacement to achieve maximum compressive and abrasionresistance are 25 and 15 respectively Key Words Hydraulic structures Alkali activated slag Zeolite Compressive strength Abrasion resistance andPermeability

كياچهربهفرنيا

محمدرضا افتخار، حسين تاجمير رياحي