Stress-crack opening relationship of engineered cementitious composites and application

Title: Stress-crack opening relationship of engineered cementitious composites and application
Author(s): Jun Zhang, Xianchun Ju
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 835 - 844
Total Pages: 10
Nb references: 20
Language: English

Abstract: The stress-crack opening relationship of engineered cementitious composites was determined from an inverse method. Two cement matrixes with water to cement ratio of 0.45, 0.35 and fiber contents of 0, 0.5%, 1.0% in volume were selected to form different series of composites. The results show that the σ−w relationship of cement matrix behaves significant tensile softening starting from cracking strength. After adding polyvinyl alcohol fibers, the stress-crack opening relationship of the composites changes to a double peak mode behaving as the crack bridging first decreases from cracking strength, then increases to the second peak.
After that the tensile softening is displayed again with increase of crack opening. The cracking strength is governed by cement matrix and the second peak stress is controlled by fibers and fiber/matrix interface. The second peak is greatly increased with increase of fiber content. The second peak stress lager than the cracking strength means strain-hardening and multiple cracking performances can be expected under tension.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00