Concrete will deteriorate and damage under sulfate attack.In order to study the degradation characteristics of HDC under sulfate attack, the mechanical properties of high-ductility concrete (HDC) were investigated using the uniaxial compressive strength test of HDC specimens soaked in different concentrations of sulfate solution and subjected to different times of dry–wet cycles. The variations in the compressive strength, loss rate of compressive strength, and the max compressive strength under the action of sulfate attack and dry–wet cycles were analyzed. The analytical expressions of damage variables were given. SEM was used to observe the microstructure of the sample, and the microdamage mechanism of the HDC was explored. The deterioration of the HDC was found to be the result of the combined action of sulfate attack and dry–wet cycles and was caused by physical attack and chemical attack. PVA prevented the rapid development of deterioration. On the basis of the change of compressive strength, the damage variable was established to quantitatively describe the degree of damage to HDC. The experimental results showed that with the increase in the number of dry–wet cycles, the compressive strength of HDC generally increased first and then decreased. As the concentration of the sulfate solution increased, the loss rate of the compressive strength of HDC generally increased and the max compressive strength gradually decreased. With the increase inthe number of dry–wet cycles, HDC first showed self-compacting characteristics and then gradually became destroyed. Compared with ordinary concrete (OC), HDC is superior to OC in sulfate resistance and dry–wet cycles. This study provided a test basis for the engineering application of HDC in sulfate attack and dry–wet cycles environment.
This study aimed to determine the uniaxial compression and splitting tensile properties of high ductile concrete under environments of different temperatures. Uniaxial compression strength and splitting tensile strength of high ductile concrete under standard curing (temperature 20±2 °C, humidity ≥95%), water curing (temperature 15±2 °C, 100% humidity), and −20 °C curing (-20±2 °C, 75%–85% humidity) were investigated. The variation laws of stress–strain response, elastic modulus and peak stress, etc. of high ductile concrete under uniaxial compression at different temperatures and the evolution laws of splitting tensile strength and energy were analyzed. Results revealed the strength variation mechanism of high ductile concrete under different curing conditions. According to the test data, the relationship between the uniaxial compressive strength and splitting tensile strength of high ductile concrete and the curing temperature and the relationship between the splitting tensile energy and the curing temperature were fitted. A constitutive model of the uniaxial compression of high ductile concrete under environments of different temperatures was established. With increasing curing temperature, the compressive strength, splitting tensile strength, elastic modulus, and energy of high ductile concrete specimens increased gradually, while the peak strain decreased gradually. The effect of curing temperature on compressive strength was significantly higher than that on splitting tensile strength.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.