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Problem statement: High Strength Concrete (HSC) normally content high cementitous&#13; amount and low water binder ratio. However, these would cause substantial volume changes to the&#13; concrete and therefore affected the strength development. In addition, the brittleness of HSC was&#13; increased when silica fume used as partial cement replacement to achieve high strength. Approach:&#13; This study discussed the effects of incorporated short discrete Coconut Fibers (CF), Barchip Fibers&#13; (BF) and Glass Fibers (GF) into HSC to enhance the performance of concrete while kept the binder&#13; content at moderate level. Additional specialty to this HSC was casted with very coarse sand with&#13; fineness modulus of 3.98. A total of thirteen mixes were casted and tested for slump, density,&#13; compressive strength, flexural strength and ultrasonic pulse velocity in accordance with British&#13; Standards. Results: The slump was slightly reduced by the short discrete fibers. All of the fibrous&#13; specimens had lower density than control. However, the compressive strength of the HSC had&#13; increased from 71.8-79.0 MPa using 1.8% of BF, while flexural strength had increased from 5.21-6.50&#13; MPa. All specimens showed that ultrasonic velocity higher than 4.28 km sec-1.&#13; Conclusion/Recommendations: In short, combination of incorporated short discrete fibers and&#13; applied very coarse sand to produce HSC showed very satisfying results and improvements. Further&#13; assessment on durability and impact resistivity will be verified in the coming research

Influences of Short Discrete Fibers in High Strength Concrete with Very Coarse Sand