EXPERIMENTAL INVESTIGATION ON PROPERTIES OF HIGH STRENGTH CONCRETE USING POZZOLANIC MATERIALS AND MANUFACTURED SAND

In this paper, high strength concretes (HSC) containing manufactured sand (or maybe called crushed sand) as fine aggregate in the presence of fly ash (FA), silica fume (SF) were made. The HSC mixtures were designed to achieve 28-day compressive strength beyond 55 MPa. Compressive strength, drying shrinkage, watertightness and sulfate attack tests were conducted to evaluate the feasibility on the production of HSC having crushed sand, FA and SF. The test results indicated that the compressive strength of all HSC mixtures exceeded 55 MPa at 28 days. There was an improvement in the compressive strength following the addition of SF in HSC. Introducing crushed sand to HSC as fine aggregate led to a reduction in compressive strength. The usage of crushed sand most effectively decreased the length change of HSC, compared with HSC containing natural sand. HSC mixtures can be classified into > B12 water-tightness class. Furthermore, weight loss of HSC was in a range of 0.040.29%.