Assessment of Statistical Variations in Experimental Impact Resistance and Energy Absorption of High Strength Concrete

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Faculty of Engineering, Lorestan University, Khorramabad, Iran

2 Department of Earthquake and Geotechnical Engineering, Faculty of Civil Engineering and Surveying, Kerman University of Technology, Kerman, Iran

Abstract

Silica fume as new supplementary cement material has several effects on initial mechanical strength and long term improvement in durability. In this paper, the impact resistance and mechanical properties of concrete mixed with silica fume are statistically investigated by preparing 288 specimens in three mix designs. The silica fume replaced 0, 7 and 14% of Portland cement by weight in mixed designs. Samples were made in different shapes including twenty cube, twenty cylindrical, and thirty-six 150×64-mm discs, casting from each batch for different test purposes. Cubic and cylindrical samples were used to determine the compressive strength and prismatic specimens were tested to obtain rupturing tensile. Also, cylindrical cutting specimens were subjected to the drop-weight test following the ACI committee 544 to determine impact strength of mixed concretes. Experimental data on the mechanical properties of different mixes indicate that silica fume improves mechanical properties and impact resistance while statistical analysis done based on these experimental tests showed the reduction of coefficient of variation values. In other words, adding silica fume improves statistical dispersion of data.

Keywords

Experimental Research in Civil Engineering
Volume 2, Issue 4 - Serial Number 4
October 2015
Pages 133-141

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