Abstract
ABSTRACT The objective of this study is to identify and quantify the effect of microsand content (MS) or silica fume (SF), water-cement-ratio (w/c) and curing time (t) on the compressive and tensile strengths of concrete at different strength ranges varied from 4 MPa to 55 MPa. In this study, over 1000 data were used to characterise the compressive and tensile strength behaviour. The range of w/c for modified concrete with different percentages of microsand up to 40% (by dry weight of cement) was in the range of 0.17% to 0.80%, compressive and tensile strengths were in the range of 4–55 MPa, and 1–7 MPa, respectively. Vipulanandan model correlated the relationship between mechanical properties of concrete modified with MS with a varied range of w/c and curing time, and the results were compared with the Hoek-Brown correlation model used in the literature. Based on the NLM parameters, the effect of MS was less than w/c and curing time on the compressive strength of modified concrete with MS in different strength range up to 55 MPa.
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