Micromechanical performance of interfacial transition zone in fiber-reinforced cement matrix

FIBRE CONCRETE 2017

Zacharda, V.^1 ; Nmeek, J.^1 ; Štemberk, P.^1

Czech Technical University, Thákurova 7, Prague 6

166 29, Czech Republic^1

关键词: Chemical compositions;    Elastic homogenizations;    Elastic properties;    Fiber reinforced cement;    Interfacial transition zone;    Measured properties;    Micro-mechanical;    Micromechanical behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/246/1/012018/pdf
DOI  :  10.1088/1757-899X/246/1/012018

来源: IOP

【 摘 要 】

The paper investigates microstructure, chemical composition and micromechanical behavior of an interfacial transition zone (ITZ) in steel fiber reinforced cement matrix. For this goal, a combination of scanning electron microscopy (SEM), nanoindentation and elastic homogenization theory are used. The investigated sample of cement paste with dispersed reinforcement consists of cement CEM I 42,5R and a steel fiber TriTreg 50 mm. The microscopy revealed smaller portion of clinkers and larger porosity in the ITZ. Nanoindentation delivered decreased elastic modulus in comparison with cement bulk (67%) and the width of ITZ (∼ 40 μm). The measured properties served as input parameters for a simple two-scale model for elastic properties of the composite. Although, no major influence of ITZ properties on the composite elastic behavior was found, the findings about the ITZ reduced properties and its size can serve as input to other microstructural fracture based models.