The Behavior of Cement-Treated Crushed Rock Material Under the Cyclic-Loading Test with Multiple Amplitude of Applied Strain: Fid-Bau Portal

The Behavior of Cement-Treated Crushed Rock Material Under the Cyclic-Loading Test with Multiple Amplitude of Applied Strain

Jitsangiam, Peerapong / Nusit, Korakod / Chummuneerat, Suphat / Nikraz, Hamid

Abstract

This paper presents the characteristics of cement-treated crushed rock material which was subjected to the multi-strain amplitudes of cyclic loads. The cyclic behaviors of cement-treated crushed rock specimens were examined by the four-point bending test adopted from the standard test for asphalt concrete. The test specimens were prepared by adding 3 and 5% cement by weight to the typical crushed rock base. The four-point bending tests were then carried out under strain-controlled mode with the strain amplitudes of 50, 100, 150, and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ 200\,\upmu \upvarepsilon $$\end{document}. Two different forms of strain-controlled tests were conducted in this research, which are constant-strain and multi-strain amplitude tests. For the constant-strain amplitude test, all specimens were loaded for one million cycles. The results revealed that the specimens tested with the strain amplitude of lower than \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ 200\,\upmu \upvarepsilon $$\end{document} were secured from fatigue failure. The multi-strain amplitude test was then employed to examine the degradation characteristics of the specimen stiffness. In this research, the multi-strain amplitude tests were conducted by employing various strain amplitudes on the individual specimen. Therefore, the test protocol with the minimum testing time and the optimum number of test specimens can be developed. More importantly, the results from multi-strain amplitude test also explored the modern knowledge on the behaviors of cement-treated crushed rock material after it is failed by the fatigue damages.