Properties and microstructures of 3D printable sulphoaluminate cement concrete containing industrial by-products and nano clay

Sun, Guangcheng; Yu, Cheng; Qian, Xiaoqian; Chen, Ruohong; Zhou, Xiangming; Weng, Yiwei; Song, Yufeng; Ruan, Shaoqin

doi:10.1016/j.jobe.2023.106839

Cited by 1 publication

(1 citation statement)

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“…Sulfoaluminate cement (SAC) is distinguished by exceptional properties including early strength, high strength, frost resistance, impermeability, corrosion resistance, and low alkalinity [ 8 , 9 , 10 ]. This type of cement also exhibits a very promising future due to its quick setting time rate [ 11 , 12 , 13 , 14 ]. The C 4 A 3 minerals in SAC and the C 3 S minerals in PC have a mutually encouraging impact on the common hydration process when sulfoaluminate cement and silicate cement are combined, hastening the hydration and setting of the combined cement [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar

Ding

Shen

Chen³

et al. 2023

Materials

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Despite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including hemihydrate gypsum, anhydrite, and dihydrate gypsum, affected SCRM’s workability, hydration process, and microstructure. The outcomes demonstrated that adding hemihydrate gypsum sped up SCRM’s early hydration rate and boosted its expansion rate. For a cement with 8% hemihydrate gypsum, 6 h after adding the water, the flexural strength and compressive strength increased by 39.02% and 34.08%, respectively. The hydration rate of SCRM can be efficiently delayed by dihydrate gypsum, although the result is subpar. The material exhibited the lowest fluidity loss in 20 min, the setting time was extended, and the 28-day flexural and compressive strengths were raised by 26.56% and 28.08%, respectively, after adding 8 percent anhydrite.

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