Degradation Characteristics and Service Life Prediction of Desert Sand Concrete Under Load and Freeze–Thaw Conditions
Zhengyang Xia, Yongjun Qin, Ling Luo
TL;DR
This study examines how desert sand concrete resists freeze-thaw damage under sustained loads in cold regions of China.
Contribution
The research introduces a Weibull model to predict the service life of desert sand concrete under combined freeze-thaw and load conditions.
Findings
Concrete with 0.3 and 0.5 stress levels retained 89.36% and 77.92% of their compressive strength after freeze-thaw cycles.
Sustained loading improved pore structure and compactness, reducing freeze-thaw damage.
Mesoscale damage mechanisms were identified using scanning electron microscopy and CT scanning.
Abstract
Concrete structures in western China often endure severe freeze–thaw cycles under sustained loading. However, the combined effects of desert sand admixtures and long-term stress on freeze–thaw durability are insufficiently investigated. The existing research has focused on the material modification of desert sand concrete (DSC) or on the mechanical-environment coupling of ordinary concrete. This leaves a knowledge gap about how sustained compressive stress influences the macro- and mesoscale freeze–thaw behaviour of DSC. This study systematically investigated the freeze–thaw resistance of DSC under varying sustained compressive stresses. Testing methods and conditions were tailored to the climatic characteristics of China’s high-altitude cold regions. Freeze–thaw degradation was assessed using mass loss, relative dynamic modulus of elasticity, and compressive strength. Controlled…
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Taxonomy
TopicsConcrete and Cement Materials Research · Climate change and permafrost · Innovative concrete reinforcement materials