Abstract
The dry–wet cycle and high temperature exposure are important factors affecting the normal use and durability of concrete structures. The objective of this work is to investigate the mechanical properties of cement mortar specimens after combinations of dry–wet cycles and high temperature exposures, uniaxial compressive tests on cement mortar specimens were carried out under the following two sets of conditions: (1) high temperature treatment followed by a dry–wet cycle and (2) a dry–wet cycle followed by high temperature treatment. The results show that the compressive strength of specimens increases with the number of dry–wet cycles. After a dry–wet cycle and then a high temperature treatment procedure, the compressive strength of a specimen will first decrease and then increase with the number of dry–wet cycles. The strain at the peak stress of cement mortar decreases as the number of dry–wet cycles increases. At present, there are few research results about the mechanical properties of concrete first after combinations of dry–wet cycles and high temperature exposures. The work in this paper can enrich the results in this area.
Highlights
IntroductionThe dry–wet cycle and high temperature exposure are important factors affecting the normal use and durability of concrete structures
The dry–wet cycle and high temperature exposure are important factors affecting the normal use and durability of concrete structures. Hydraulic structures, such as piers, in splash zone environments will be affected by the dry–wet cycle caused by water level changes, and the concrete structure comprising such a pier may be exposed to fire or high temperatures
The compressive strength of the specimens that underwent the dry–wet cycles at room temperature increased with the number of dry–wet cycles, mainly because the clinker mineral hydrates in the cement increase with the length of the time spent in sufficient water
Summary
The dry–wet cycle and high temperature exposure are important factors affecting the normal use and durability of concrete structures. Hydraulic structures, such as piers, in splash zone environments will be affected by the dry–wet cycle caused by water level changes, and the concrete structure comprising such a pier may be exposed to fire or high temperatures. Wei et al [2] investigated the effect of chloride wet/dry exposure on bonding behavior of BFRP-strengthened concrete beams. Ma et al [6] investigated the properties of concrete, including ordinary Portland concrete and high-performance concrete (HPC), subjected to dry-wet cycles in a variety of salt lake brines.
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