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28 days air content annular specimens ASTM autoclave Building Science Series Bureau of Standards C4AF Calculated contribution calculated ranges Cement and Concrete cement to graded cements with respect coef./s.d. ratios less coefficients commonly determined variables compressive strength values compressive-strength computed dd dd dd door effect enamels expansion values exposure fire floor Frequency distribution graded Ottawa sand gypsum heat of hydration highly significant increase indicated investigation Kure Beach laboratory load loss on ignition measurements ments mortar mortar cubes NAE cements National Bureau Number of cements oo oo oo oxides plotted portland cement presented in table relationship resistance roofing S.D. values silica slump smoke specifications standard deviation steel Structures Report sulfate temperature test methods thermal thermal conductivity thermocouples tion trace elements turbidimeter types of cement various independent variables WAGN water requirements water-cement ratio water-stored