SUSTAINABLE STRUCTURAL LIGHTWEIGHT CONCRETE DESIGN AND THE INVESTIGATION OF THE MECHANICAL PROPERTIES

Abstract

This paper reports an experimental investigation and statistical analysis carried out to evaluate sustainable structural lightweight concrete (SSLWC) design and the mechanical properties of SSLWC. CEM I 42,5 N cement was partially replaced with silica fume (SF) 10% and fly ash (FA) 30% by weight, respectively. The tests of compressive, split tensile strength and ultrasonic pulse velocity were performed on the specimens prepared with admixtures at ages of 3, 28 and 90 days. From the results it was seen that specimens prepared with SF showed better strength properties than others. While control concrete specimens showed similar strength properties to concrete specimens with SF admixture at early age, those of concrete specimens with FA admixture did not increase at the same age.  Furthermore, FA concrete series gave very close results to control concrete at advanced age. In this study, analysis of variance (ANOVA) and F-test were performed to see the effects of the experimental parameters on results.

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