Flexural, tensile and interfacial bond test results for sisal fiber-reinforced RHAC mortar composites.pdf

The effects of fiber content on tensile, flexural and interfacial bond strength of sisal fiber-reinforced rice-husk ash cement (RHAC) mortar were studied. The composite fabrication process involved mixing, hand-laying of the fiber-reinforcement, compaction and curing. The specimens were subjected to flexural, and direct tensile test in varying fiber volume fractions and orientation. The results show that the flexural and tensile strength increases by 342.45% and 295.01% respectively for continuous parallel aligned sisal fiber-reinforced RHAC, and by 152.99% and 195.8% respectively for the 30mm discontinuous randomly distributed sisal fiber-reinforced RHAC compared to the unreinforced (standard control) specimens The fiber/matrix interfacial bond strength and the average crack spacing decreased with increasing fiber additions in both composites.

本研究探讨了纤维掺量对剑麻纤维增强稻壳灰水泥（RHAC）砂浆的抗拉强度、抗弯强度及界面粘结强度的影响。该复合材料的制备工艺包括混料、纤维增强体手工铺置、压实与养护。本研究针对不同纤维体积掺量与纤维取向的试样，开展了抗弯试验与直接抗拉试验。试验结果表明，与未增强的标准对照试样相比，连续平行排布剑麻纤维增强RHAC的抗弯强度与抗拉强度分别提升342.45%与295.01%；而30mm长不连续随机分布剑麻纤维增强RHAC的抗弯强度与抗拉强度分别提升152.99%与195.8%。两种复合材料的纤维-基体界面粘结强度与平均裂纹间距均随纤维掺量的增加而降低。