Ma, Q.; Li, B. Performance of a New Grouting Material under the Coupling Effects of Freeze–Thaw and Sulfate Erosion. Materials2023, 16, 5448.
Ma, Q.; Li, B. Performance of a New Grouting Material under the Coupling Effects of Freeze–Thaw and Sulfate Erosion. Materials 2023, 16, 5448.
Ma, Q.; Li, B. Performance of a New Grouting Material under the Coupling Effects of Freeze–Thaw and Sulfate Erosion. Materials2023, 16, 5448.
Ma, Q.; Li, B. Performance of a New Grouting Material under the Coupling Effects of Freeze–Thaw and Sulfate Erosion. Materials 2023, 16, 5448.
Abstract
In order to study the performance of a new type of cement-based grouting material under the coupling effect of freezing-thawing cycle and sulfate attack, experiments were designed and carried out. The damage mechanism of the material under the coupling effect of freezing-thawing and Na2SO4 solution was analyzed by measuring the mass change, relative dynamic elastic modulus, compressive strength loss and microstructure of the new grouting material. With increasing freeze-thaw cycles, mass loss and compres-sive strength loss of the sample in 15% Na2SO4 solution gradually increase, and the relative dynamic elastic modulus gradually decreases. During a 30-cycle freeze-thaw cycle, the mass loss rate, compressive strength loss rate, and relative dynamic elastic modulus of the sample are 4.17%, 24.59%, and 84.3%, respectively, showing good corrosion resistance and frost resistance durability. Microscopic analysis showed that SO42- caused the decomposition of C-S-H gel in the sample and the formation of Gypsum, and the widening of crack width aggravated the internal deterioration, indicating that the material deterioration rate increased under the dual-factor coupling effect.
Keywords
grouting material; sulphate attack; freezing and thawing cycle; microstructure
Subject
Engineering, Chemical Engineering
Copyright:
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