EXPERIMENTAL STUDY ON COMPRESSIVE BEHAVIOR AND FLEXURAL BEHAVIOR OF DUCTILE FIBER REINFORCED CONCRETE

Sixteen groups of ductile fiber reinforced concrete specimens were designed by orthogonal test method． According the 28 － day，56 － day and 90 － day cube compressive test and 56 － day bending test，the effects of factors such as fiber volume fraction，water cement ratio，sand binder ratio and content of fly ash on mechanical properties were studied． The test results indicate: 1) the compressive toughness and ductility of the concrete is improved significantly by fiber bridging effect; 2) the impact of the content of fly ash and water cement ratio on the compressive strength is very significant，while the effects of the fiber volume fraction and the sand binder ratio are little; and 3) the impact of fiber fraction on the flexural strength is very significant，while amount of fly ash，water cement ratio and sand binder ratio are less，which have some effects on the ductility of the specimen． The optimal mixing ratio of ductile fiber reinforced concrete with certain strength and higher ductility are determined based on orthogonal experiment results and analysis of the mix design parameters．