Rice husk ash is the primary supplementary cementitious material,with rubber particles injected as artificial flaws.Rice husk ash and crumb rubbers engineered cementitious composites(CR-RHA/ECC)are low carbon,ecologically friendly cementitious composites with good ductility.The effects of rubber content(0,10%,20%,30%)on the ductility and cracking characteristics of CR-RHA/ECC at each curing ages(7 days and 28 days)were explored employing macroscopic mechanical properties and microscopic investigations.The results show that:With the increase of age,there is a great difference in the ductility of CR-RHA/ECC.The replacement of 10%river sand by CR weakens the ductility of CR-RHA/ECC at 7 days by 54%and increases the ductility of CR-RHA/ECC at 28 days by 67%.With the increase of age(28 days),When CR replaces 30%river sand,the ductility of CR-RHA/ECC can reach 6%,and the tensile fracture width of CR-RHA/ECC decreases by 52.79%compared with that of CR-RHA/ECC without CR replacement.
high ductility cementitious compositesrice husk ashcrumb rubberductilitycrack wide
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