Shear Capacity Analysis of High-Strength Reinforced Concrete Beams using Geopolymer Flyash and Palm Oil Blast Fμmace Slag as Additives and Aggregate Substitution

摘要

High-strength concrete made with a lot of cement,aggregates and super plasticizer leading to expensive cost.On the contrary,manufacturing of cement is un-environmental friendly because it needs high fuel consumption and releases the CO2 emission to the atmosphere.Moreover,the availability of aggregates coming from river and natural rock decreases over time.This research aims to analyze shear capacity of high-strength reinforced concrete(HSRC)beams added with geopolymer flyash i.e.,15% coal flyash(CFA),10% pozzolanic flyash(PFA)and 15% palm oil blast fμmace slag ash(POSFA)from cement weight as additives;10% palm oil blast fμmace slag(POSS)and 20% pozzolanic sand(PSS)as fine aggregate substitution;and 40% palm oil blast fμmace slag as coarse aggregate substitution(POSCA).One plain beam without flyash and aggregate substitution(PBHSC)was tested as comparison.Shear capacity of beams was tested by giving a concentrated load which divided then into two point load(third point loading).Result of shear test showed that all beams experienced shear failure as planned,obtained by applying the actual capacity ratio of flexure to shear 2.29.Aggregate substitution from palm oil blast fμmace slag both as fine and coarse aggregates could enhance shear capacity of HSRC beam compared with plain beam.The hardness of palm oil blast fμmace slag contributed to this increase,which has wearing value not much different than split,i.e.,4.7% compared with 6.7%.Utilization of flyash did not contribute to the increase of shear capacity as well,although its compressive strength enhanced when compared to PBHSC.