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Abstract:This report is the result of a three phase research program in which cements and aggregates from various supplier were studied in an effort to evaluate and improve various constitutents in concrete mixes. The major emphasis of this study has been on the classification of cements when used in concrete mixes, and finally, the potential reactivity of aggregates used in concrete supplied to the Louisiana Department of Highways.
The experience gained from this study indicated the following:
1) The method of classifying cements according to tricalcium silicate is inadequate since the tricalcium silicate values showed poor correlation with compressive strength of concrete.
2) There was no relationship between compressive strength and modulus of elasticity for the cement mixes studied.
3) There is a poor relationship between the Chemical Method (ASTM C-289) and the Mortar Bar Expansion Method (ASTM C-227) for determining the potential reactivity of aggregates; and, the Chemical Method is incomplete without the supplemental data of the Mortar Bar Expansion Method.
4) All deleterious aggregate specimens, except one, molded and tested according to ASTM C-227, "Alkali Reactivity of Cement Aggregate Combination," showed less than a .05% increase in overall expansion at the end of a 3 month test period and all aggregate specimens showed less than 0.1% at the end of the 6 month test.
5) There was no significant difference chemically in the cements studied that affected the physical properties of the concrete mixes.
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