1 resultado para critical point drying method
em Research Open Access Repository of the University of East London.
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Resumo:
This paper presents a scientific development to address the current absence of a convenient technique to identify the ductile to brittle transition of bentonite clay mats. The instrumented indentation and 3-point bending tests were performed on different liquid polymer hydrated bentonite clay mats at varying moisture content. Properties measured include modified Brinell Hardness Number (BHN) and elastic structural stiffness (EI). The dependence of flexural stiffness on moisture content is demonstrated to conform to a best power function variation. The ductile to brittle transition of clay mat is affected primarily by the change in the moisture content and for the clay mat to remain flexible, critical moisture content of 1.7 times of its plastic limit is required. Results also indicate that a strong correlation between indentation hardness and the structural stiffness. The subsequent outcome in the development of a portable quality control device to monitor the acceptable moisture content level to ensure flexibility of the clay mats was also described in this paper.