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A platform for research: civil engineering, architecture and urbanism
Preparation of calcium sulphoaluminate cement-Portland cement-gypsum based sleeve grouting material: Performance optimization and tensile properties of sleeve connector
Abstract The grouting material plays a crucial role in the connection system of prefabricated constructions. However, at the present stage, traditional cement-based grouting materials still face challenges in balancing workability with early strength and high strength. In this study, the grouting material is prepared using a ternary composite system of calcium sulfoaluminate cement (CSA) -Portland cement (PC) -gypsum. Through a combined approach of macroscopic experiments and microscopic analysis, the factors influencing the performance of the grouting material are analyzed. A method for the grouting material with both excellent workability and high strength is proposed. And the performance of the prepared grouting material in the connection system is examined through tensile testing. The study indicates that the optimal mixing proportion of the grouting material is as follows: water-binder ratio of 0.2, CSA:PC ratio of 1:9, 45% content of composite admixing, FA:GMP ratio of 3:1, binder-sand ratio of 1.1, and dosages of 2% for SP and 0.1% for defoamer. The grouting material exhibites an initial fluidity of 350 mm, a 30-minute retention value of 305 mm, a strength of 60.1 MPa at 1 day, and a strength of 115.1 MPa at 28 days. These results demonstrate characteristics such as good fluidity, early strength, and high strength. Microscopic analysis reveals that the AFt crystal skeleton, Ca(OH)2 crystals, and C-S-H gel formed during the hydration of the grouting material are tightly bound and interlock with each other, creating a dense network structure. This imparts the grouting material with high early and late-stage strength. The yield strength of the grouting sleeve connector at long age is greater than 420 MPa, and the tensile strength is greater than 600 MPa, which indicates that the grouting material prepared in this study shows outstanding mechanical properties.
Highlights A ternary composite system of calcium sulfoaluminate cement (CSA) -Portland cement (PC) -gypsum. Analyze the factors that affect the performance of grouting materials. The grouting materials with construction properties and strength. The tensile test examines the performance of prefabricated grouting materials.
Preparation of calcium sulphoaluminate cement-Portland cement-gypsum based sleeve grouting material: Performance optimization and tensile properties of sleeve connector
Abstract The grouting material plays a crucial role in the connection system of prefabricated constructions. However, at the present stage, traditional cement-based grouting materials still face challenges in balancing workability with early strength and high strength. In this study, the grouting material is prepared using a ternary composite system of calcium sulfoaluminate cement (CSA) -Portland cement (PC) -gypsum. Through a combined approach of macroscopic experiments and microscopic analysis, the factors influencing the performance of the grouting material are analyzed. A method for the grouting material with both excellent workability and high strength is proposed. And the performance of the prepared grouting material in the connection system is examined through tensile testing. The study indicates that the optimal mixing proportion of the grouting material is as follows: water-binder ratio of 0.2, CSA:PC ratio of 1:9, 45% content of composite admixing, FA:GMP ratio of 3:1, binder-sand ratio of 1.1, and dosages of 2% for SP and 0.1% for defoamer. The grouting material exhibites an initial fluidity of 350 mm, a 30-minute retention value of 305 mm, a strength of 60.1 MPa at 1 day, and a strength of 115.1 MPa at 28 days. These results demonstrate characteristics such as good fluidity, early strength, and high strength. Microscopic analysis reveals that the AFt crystal skeleton, Ca(OH)2 crystals, and C-S-H gel formed during the hydration of the grouting material are tightly bound and interlock with each other, creating a dense network structure. This imparts the grouting material with high early and late-stage strength. The yield strength of the grouting sleeve connector at long age is greater than 420 MPa, and the tensile strength is greater than 600 MPa, which indicates that the grouting material prepared in this study shows outstanding mechanical properties.
Highlights A ternary composite system of calcium sulfoaluminate cement (CSA) -Portland cement (PC) -gypsum. Analyze the factors that affect the performance of grouting materials. The grouting materials with construction properties and strength. The tensile test examines the performance of prefabricated grouting materials.
Preparation of calcium sulphoaluminate cement-Portland cement-gypsum based sleeve grouting material: Performance optimization and tensile properties of sleeve connector
Pan, Huimin (author) / Wu, Ximeng (author) / Song, Kun (author) / Zhang, Yan (author) / Zhao, Qingxin (author)
2024-02-04
Article (Journal)
Electronic Resource
English
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