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6. Comparison of stearic acid and oleic acid for shrinkage-mitigating of alkali-activated slag composites.

Author

Huo, Yanlin, Huang, Jinguang, Xu, Ning, Lu, Dong, Han, Xiaoyu, Sun, Huayang, Hu, Sile, Liu, Tianan, Wang, Jianghong, Zhou, Jingya, and Yang, Yingzi

Abstract

The large drying shrinkage is one of the most serious factors limiting the practical application of alkali-activated slag concrete (AASC). In this study, based on the successful shrinkage reduction of waste cooking oil for alkali-activated slag paste (AASP), the influence of stearic acid (saturated fatty acids) and oleic acid (unsaturated fatty acids) on fresh properties (setting time and fluidity), physical characteristics (density and water absorption), mechanical strengths (flexural strength and compressive strength), and durability (drying shrinkage, self-shrinkage, and carbonation resistance) are systematically compared. The experimental results reveal that admixing stearic acid and oleic acid can effectively inhibit the drying shrinkage and self-shrinkage of the AASP. Specifically, adding 1 wt% stearic acid (oleic acid) can reduce the drying shrinkage of the AASP by 20% (25%) and self-shrinkage by 32% (55%), respectively. Remarkably, the combined usage of the two additives can maximize the performance of the AASP, such as obtaining satisfactory mechanical strengths, extending the initial setting time, and improving the carbonation resistance. The developed AASP can be regarded as a low-cost and environmentally-friendly product, which can promote practical applications of AASC. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Understanding the roles of Li2CO3in a sulphoaluminate cement system at negative temperatures

Author

Huo, Yanlin, Hu, Sile, Lu, Dong, Han, Xiaoyu, Sun, Huayang, Ma, Xiaobing, Liu, Tianan, Zhang, Chen, Chen, Zhitao, Huang, Jinguang, and Yang, Yingzi

Abstract

To overcome the slow development of mechanical strengths of sulphoaluminate cement (CSA) in winter construction, this paper investigates the effects of different amounts of admixing Li2CO3on the setting time, compressive strength, and cooling curve of CSA paste in negative temperatures (−5 °C, −10 °C, and −20 °C). The influence of admixing Li2CO3on the hydration process and microstructure of CSA paste in a negative temperature environment is also studied using X-ray diffraction (XRD)-Rietveld quantitative analysis, Thermogravimetry (TG) analysis, and Scanning electron microscopy (SEM) observation. The results show that adding Li2CO3into CSA can significantly improve the mechanical properties at an early age, shorten the curing time, and reduce the freezing point under negative temperatures. The XRD-Rietveld and TG analysis indicates that adding Li2CO3can increase the consumption of C4A3S̅ and promote the generation of AFt at negative temperatures. It is recommended that the optimum dosage of Li2CO3should be 0.16 wt% when used as an admixture for CSA systems in negative temperatures.

Published
2023
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