Influence of Chemical Treatment on the Tensile Property of Ultra-High Performance Concrete (UHPC)

Author(s): Lihui Zhang, Jianzhong Liu, Qianqian Zhang, Fangyu Han
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 304-318
Total Pages: 15
Language: English

Abstract: This paper aimed to study the tensile properties of ultra-high performance concrete with and without zinc phosphate (ZnPh) conversion on fibers of different shapes, namely straight and hook-end shape. Results showed that the ultra-high performance concrete (UHPC) mixture with ZnPh coating on hook-end fiber behaved a poorest workability and highest compressive
strength. ZnPh treatment was not only beneficial in improving the fiber/matrix interface bond, especially when mechanical interlocking was absent (straight fibers), but also led to a significant increase in first cracking strength, post cracking strength, as well as energy absorption capacity for UHPC with treated fibers under tensile test. Besides, various hybridization designs of the fibers can provide different tensile properties for UHPC. The optimal post cracking strength of UHPC mixture with 2% fiber volume fraction can be obtained
by blending treated fibers with the weight ratio of straight steel fiber to the hook-end steel fiber was 1.5 and the post cracking strength was up to 10.14 MPa, which was increased by 15.23% compared to that with un-treated straight steel fibers. Tensile properties of UHPC can be successfully tailored by hybrid fiber system and increasing the fiber-matrix interface bond through use of deformed and ZnPh treated fibers.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00