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2 2024

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Methods of improving the workability and mechanical properties of sulfoaluminate cement mortar

Liu Ping, Li Teng, Chen Pang, Cao Zhonglu, Jia Guanyuan

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 1

art. no. e12, 2024

The rapid setting rate restricts the application of sulfoaluminate cement (SAC), it is necessary to develop SAC mortar with a controlled setting time. Therefore, this paper tries to use sodium gluconate (SG) and mineral admixture to reduce its reaction speed and study the effects of SG and mineral admixture on the workability, mechanical properties and durability of SAC mortar. First, the optimal amount of SG doping was determined to be 0.4% under the comprehensive consideration of the working performance, mechanical performance, and durability of SAC. Again, based on the determination of SG dosing, the effects of four mineral admixtures, fly ash, silica fume, Ground Granulated Blast furnace Slag (GGBS), and limestone powder, on the mechanical properties and chloride ion penetration resistance of SAC were studied, and the optimal dosing of each mineral admixture was determined. Finally, a microscopic analysis of the specimen was conducted through a Scanning Electron Microscope (SEM) to reveal the reaction mechanism of SAC from a macroscopic perspective.

Influence of fiber on the shrinkage performance of alkali-activated slag recycled concrete

Li Yunhe, Chen Pang, Chen Zaixian, Liu Xinghao, Liu Zhaomeng, Liu Yinbo

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 3

art. no. e153, 2024

Alkali-activated slag recycled coarse aggregate concrete (AAS-RAC) is a novel type of green building material with significant growth potential, utilizing waste slag and construction waste effectively. However, its large shrinkage and poor toughness limit its further utilization. Adding fiber is the crucial way to limit its shrinkage. Therefore, the effects of fiber type and content on the shrinkage performance of AAS-RAC were systematically studied. The results show that the incorporation of recycled aggregate increases the shrinkage of AAS-RAC, and AAS-RAC of full recycled aggregate is 59% higher than that of undoped aggregate. The addition of steel fiber, polypropylene fiber and basalt fiber can effectively reduce the shrinkage of AAS-RAC. Among them, steel fiber has the best inhibition effect, and 0.6% steel fiber can reduce the shrinkage of AAS-RAC by 30.6%. The AAS-RAC shrinkage model considering the influence of fiber content and recycled aggregate is established. The research results provide an effective way to reduce the shrinkage of AAS-RAC.