Deformation behavior of high performance fiber reinforced cementitious composite prepared with asphalt emulsion

HE Rui(何锐)^{1, 2, 3}, CHEN Shuan-fa(陈拴发)^{1, 3}, SUN Wen-juan(孙文娟)⁴, GONG Rui(弓锐)⁵

(1. Engineering Research Center for Transportation Materials of Ministry of Education
(Chang’an University), Xi’an 710061, China;
2. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China;
3. Guangxi Transportation Research Institute, Nanning 530007, China;
4. Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and
State University, Blacksburg 24061, USA;
5. Xi’an Highway Research Institute, Xi’an 710054, China)

Abstract:A novel engineered cementitious composite (ECC) was prepared with the complex binder of Portland cement and asphalt emulsion. By adjusting the amount of asphalt emulsion, different mixture proportions were adopted in experiments, including four-point bending test, compressive test, and scanning electric microscopy (SEM). The SEM observation was conducted to evaluate the contribution of polyvinyl alcohol (PVA) fiber and asphalt emulsion to the composite toughening mechanism. The tests results show that the most remarkable deflection-hardening behavior and saturated multiple cracking are achieved when the content of asphalt emulsion is 10%. However, excessive content of asphalt emulsion causes severe damages on the deformation behavior as well as loss in compressive strength of the mixture. SEM observation indicates that the influence of asphalt emulsion on the fiber/matrix interfacial property changes the dominant fiber failure type from rupture into pull-out mode, and thus causes beneficial effects for strain-hardening behavior.

Key words:toughness; deformation behavior; engineered cementitious composite; asphalt emulsion