| Title |
Flexural Performance of Plain Concrete Prisms with a Layer of Expansive Strain-hardening Cement-based Composite(SHCC) Prepared with Hybrid Polyethylene(PE) and Steel Fiber |
| Authors |
Yang, Hae-Jun ; Lee, Young-Oh ; Park, Sang-Hyuk ; Yun, Hyun-Do |
| Keywords |
Flexural Strengthening ; Expansive Admixture(EXA) ; Strain-hardening Cement-based Composite(SHCC) ; Multiple Cracks ; Stress Redistribution |
| Abstract |
This paper provides the flexural test results of concrete prisms with a layer of expansive strain hardening cement-based composite(SHCC) in the tension zone. The objective of this study is to evaluate the effect of the layer thickness(30 and 40㎜), SHCC strengths(30, 70 and 100MPa) and SHCC types(conventional and expansive SHCC) on the flexural performance and cracking behavior of SHCC-layered concrete prisms. Both conventional and expansive SHCC materials were reinforced with hybrid 0.75% polyethylene(PE) and 0.75% steel fibers in volume fraction. In expansive SHCC, 10% of cement amount were replaced with calcium sulfo aluminate(CSA) expansive admixture(EXA). The concrete beams were loaded in static four-point bending using a universal testing machine with 0.75 mm/min of strain rate. Test results of SHCC materials indicate that the replacement of EXA leads to significant improvement for the compressive and flexural strength of 30 and 70MPa SHCC materials. From test results of SHCC-layered beams, It is found that concrete beams with a layer of 30 and 70MPa expansive SHCC showed higher flexural strength than concrete beams with a conventional SHCC layer. |