Cryogenic Bond Stress-Slip Relationship

摘要

The classical bond-slip theory used to determine the most important parameters which affect crack width and spacing. The theory assumes that, when the tensile capacity of the concrete is reached, the concrete cracks. At room temperature it is common practice to assume a linear relation between the bond stress and the compressive strength. To verify this relationship at low temperatures, the compressive strength of concrete is also investigated. Thus the aim of the research program is to determine at least the bond stress-slip relationship, the tensile (splitting) strength, the compressive strength and the thermal behavior of the concrete at various temperatures. The classical bond-slip theory is also expected to be valid at low temperatures, which fact should be proven analytically and experimentally. Furthermore, much attention is paid to the modelling of the splitting failure mechanism as a function of temperature. In practice this failure mode should be prevented because failure takes place in a brittle way.