Abstract
Strain Hardening Cementitious Composites (SHCC) are materials exhibiting high tensile ductility with the formation of multiple cracks. Since the mechanical properties of SHCC members are governed by the interfacial characteristics between fibers and matrix, understanding the mechanism of single fiber pullout behavior is crucial for SHCC material design. Existing model was set up based on Polyvinyl Alcohol (PVA) fibers, making it inapplicable to other kinds of synthetic fibers those exhibit divergent pullout behaviors. As a result, the simulated curves cannot agree well with the tested results of SHCC made with other fibers or hybrid fibers. In this study, a unified single fiber pullout model was proposed to take divergent kinds of fiber pullout behavior into account. Five parameters were defined to describe the single fiber pullout behavior, where the frictional strength during the pullout stage and the blocking length of fiber under pulley force were for the first time introduced. For verification purpose, fiber-pullout samples with Polyethylene terephthalate (PET) and PVA fibers were tested and the results agree well with the simulated curves from proposed model. The stochasticity of each parameters were then analyzed and described by normal distribution, through which fibers with various random pullout behaviors can be incorporated into a larger scale modelling. Therefore, the fiber-bridging constitutive law for a single crack was calculated and compared with the single crack test results, which confirmed again the validity of the proposed model.
Highlights
Due to the quasi-brittle nature, traditional cementitious materials are vulnerable to cracking (Li et al, 2003; Jun et al, 2006; Zhigang, 2020a)
This paper aims at establishing a unified fiber bridging model of Strain Hardening Cementitious Composites (SHCC), applying to different kinds of fibers which may show different surface bonding properties
A unified model for single fiber pullout was successfully developed with introduced parameters, which is suitable for fibers with different interfacial properties, including Polyethylene terephthalate (PET) and Polyvinyl Alcohol (PVA) fibers investigated in this paper
Summary
Due to the quasi-brittle nature, traditional cementitious materials are vulnerable to cracking (Li et al, 2003; Jun et al, 2006; Zhigang, 2020a). Fibers are added to control the cracks and improve toughness (Graybeal, 2006). With moderate fiber content added, Strain Hardening Cementitious Composites (SHCC) was developed in the 1990s (Li and Leung, 1992; Li and Wu, 1992; Victor and Forii, 1993; Leung, 1996; Li et al, 2001; Li, 2011; Victor and Li, 2012; Zhigang, 2021), which exhibits strain hardening behavior accompanied by the formation of multiple cracks and ensures the high ductility and durability of the structure. In order to explain the strain hardening behavior in SHCC, the design criterion for SHCC including fiber, matrix and interface parameters have been proposed by Li first (Victor and Li, 2012).
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