11Fly ash is used in concrete as a:AAdmixture to speed settingBSupplementary cementitious material (pozzolana)CCoarse aggregateDReinforcementView AnswerDiscussWorkspaceReportSaveEasy
12Which compound of cement contributes most to its ultimate (later) strength?AIron oxideBTricalcium aluminate (C₃A)CGypsumDDicalcium silicate (C₂S)View AnswerDiscussWorkspaceReportSaveEasy
13Fineness of cement is tested by:ASlump testBVicat apparatusCLe Chatelier apparatusDSieve analysis or Blaine's air permeability apparatusView AnswerDiscussWorkspaceReportSaveEasy
14Soundness of cement is tested with the:ALe Chatelier apparatusBProctor mouldCVicat apparatusDSlump coneView AnswerDiscussWorkspaceReportSaveEasy
15The final setting time of ordinary Portland cement should not exceed:A600 minutesB30 minutesC60 minutesD24 hoursView AnswerDiscussWorkspaceReportSaveEasy