ABSTRACT
In this study, new ECC mixture designs have been developed using a type of low-cost PVA fiber without oil-coating. High fly ash content, fly ash cenosphere and crumb rubber were incorporated into the mixture design to compensate for the micromechanical change associated with using the low-cost PVA fiber. Compressive and tensile test were conducted to characterize the performance of the newly developed ECC mixtures. ECC with tensile strength of 5.6 MPa and tensile strain capacity of 1.9% has been successfully developed using such fiber. For applications requiring higher tensile ductility, by increasing fly ash content and incorporating FAC or crumb rubber, the tensile ductility of the new ECCs can be further enhanced with moderate decrease in compressive and tensile strength. By incorporating low-cost PVA fiber, the cost-effectiveness of ECC has been greatly improved, which is expected to greatly promote the application of ECC in pavement engineering field in China.
