PRELIMINARY EXPERIMENTAL ASSESSMENT OF A LOCAL SAND FOR POSSIBLE APPLICATION AS A STANDARD SAND IN CEMENT COMPREHENSIVE STRENGTH TEST

M. Y. S. Aminu Bayawa, A. Adigun, H. U. Shinkafi, A Musa

Abstract


Simplex Centroid Mixture Design was used to investigate the proportion of three fractions of local sand for possible application as standard sand in Comprehensive Strength (CS) test. The results show that the CS is largely dependent on the particle size of the sand. In general, increase in proportion of the fraction with relatively large fractions gives cement mortar with high CS while increase in fraction with finer particles decreases the CS of the mortar. Optimization analysis gave four different formulations of the local sand predicted to give cement mortars with compressive strengths that are largely the same as that of the standard sand. The composite sands have optimal proportion of the three bulk fractions of the local sand varying within 77.9 – 88.0 %, 9.3 – 12.7 % and 2.8 – 3.7 %, respectively. Validation results confirmed the predictions.

Keywords: Standard Sand, Cement, Comprehensive Strength Test


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