Paper Title:

Experimental Study on Fracture Properties of Cementitious Materials

Periodical Key Engineering Materials (Volumes 348 - 349)
Main Theme Advances in Fracture and Damage Mechanics VI
Edited by J. Alfaiate, M.H. Aliabadi, M. Guagliano and L. Susmel
Pages 157-160
DOI 10.4028/www.scientific.net/KEM.348-349.157
Citation Yu Zhu et al., 2007, Key Engineering Materials, 348-349, 157
Online since September, 2007
Authors Yu Zhu, Shi Lang Xu
Keywords Cementitious Material, Fracture, Micro-Mechanics, Three-Point Bending Beam
Price US$ 28,-
Article Preview
View full size
Abstract

For micro-fiber reinforced strain-hardening cementitious materials, in addition to the basic characteristics and mechanical properties of fiber and interfacial properties between fiber and matrix, mechanical properties of matrix such as strength and crack resistance are essential parameters for material design, too. Therefore, the fracture properties of cement paste and mortar which are two most basal cementitious materials were studied, using three-point bending beams of which strength and depth are varied. Complete load versus crack mouth opening displacement (P-CMOD) curve directly obtained, and double-K fracture parameters ini Ic K and un Ic K were subsequently determined. The initial cracking load Pini was determined using resistant strain gauges. The results show that an apparent stable crack propagation before unstable failure was observed both in cement paste and in mortar. For cement paste, due to the influence of shrinkage crack, the divergence of the unstable fracture toughness un Ic K is more evident than initial fracture toughness ini Ic K .