Compressive Strength of Basic Magnesium Sulfate Cement Coral Aggregate Concrete (MCAC) on Non-Destructive Testing

Abstract

Basic magnesium sulfate cement coral aggregate concrete (MCAC) is a new type of concrete consisting of basic magnesium sulfate cement, coarse coral aggregate, coral reef sand and seawater. The rebound hammer (RH), the ultrasonic pulse velocity (UPV) and the compressive strength (f _cu) tests of 14 sets of cube specimens of the MCAC after 28 d of aging were conducted. The impact of the content and length of sisal fiber on the relationship between the fcu - RH and the fcu - UPV was determined. A mathematical model was established to predict the strength of the MCAC using the UPV, RH, and comprehensive UPV/RH methods and to obtain the curves of test strength. The applicability of the test strength curves of ordinary portland concrete (OPC), light-weight aggregate concrete (LAC), and coral aggregate concrete (CAC) to MCAC was assessed. The results showed that the test strength curves of OPC, LAC and CAC were inappropriate to determine the strength of MCAC using non-destructive method. The relative standard error of the curves of test strength of the RH method and the comprehensive method met the specifications, whereas that of the UPV method did not.

Keywords

non-destructive testing / basic magnesium sulfate cement coral aggregate concrete / ultrasonic pulse velocity / rebound hammer / specific test strength curves

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