Experimental investigation and multiscale modeling of reactive powder cement pastes subject to triaxial compressive stresses
| Autor: | Yun-Hui Fan, Tao Ni, Kun Zhang, Jie Shen, Lun-Yang Zhao, Qi-Zhi Zhu |
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| Rok vydání: | 2019 |
| Předmět: |
Dilatant
Materials science Constitutive equation 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction Strain hardening exponent Overburden pressure Multiscale modeling Homogenization (chemistry) 0201 civil engineering 021105 building & construction General Materials Science Composite material Porosity Softening Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 224:242-254 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2019.07.049 |
| Popis: | This paper presents experimental and numerical studies on the triaxial mechanical behaviors of reactive powder cement (RPC) pastes prepared with an alcohol-based shrink-reducing admixture (ASRA) and ice-replaced mixing procedure. Standard cylindrical samples were cored from three kinds of high strength RPC pastes. For each kind of RPC pastes, a series of triaxial compression tests were performed under different confining pressures. It is shown that the RPC pastes under consideration present a typical quasi-brittle behaviours, including nonlinearity of stress-strain curves, strain hardening/softening, pressure sensitivity, volumetric dilatancy, triaxial strength nonlinearity, etc.For completeness, triaxial cyclic tests with two different confining pressure were conducted to analyse the mechanical damage characteristics of RPC pastes. Based on the experimental investigations and considering the mircostructure evolution of RPC pastes, a two-step homogenization-based multiscale constitutive model was developed. The model allows to take into account the influence of porosity on elastic constants, material damage induced by mesocracking as well as plastic deformation caused by frictional sliding. There is a good agreement between numerical simulations and experimental data. |
| Databáze: | OpenAIRE |
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