Effects of Slag Types on Hydration and Hardening of New Gypsum Slag Sulphoaluminate Cement

Abstract

Abstract: The difference of physical and chemical properties of slag has a great effect on the performance of new gypsum slag sulphoaluminate cement (SAC-GS). Therefore, three typical slags for production were selected to try to construct the relationship between the composition, structure of slag and the macroscopic properties of SAC-GS in multiple dimensions. The mineral composition, element composition and the existence state of each slag were compared and analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The hydration process of each hardened cement paste sample was analyzed by Scanning electron microscope (SEM), XRD and other methods, and the compressive and flexural strength of each sample at different hydration ages were tested, and the early hydration heat release evolution and pore size distribution were compared. The results show that the slag with higher aluminum content and higher reactivity has faster strength development, higher hydration degree and denser pore structure of cement sample. Slag with high aluminum content should be selected for the preparation of SAC-GS.

Key words: slag, physical and chemical properties, hydration heat, hydration products, micromorphology, pore structure, gypsum slag sulphoaluminate cement

CLC Number:

TQ172.4⁺4

WU Yanan, WANG Huangqi, WANG Dongmin, SUN Rui, LYU Nan. Effects of Slag Types on Hydration and Hardening of New Gypsum Slag Sulphoaluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1352-1361.

References

[1] NEWLANDS K C, FOSS M, MATCHEI T, et al. Early stage dissolution characteristics of aluminosilicate glasses with blast furnace slag- and fly-ash-like compositions[J]. Journal of the American Ceramic Society, 2017, 100(5): 1941-1955.
[2] SKIBSTED J, SNELLINGS R. Reactivity of supplementary cementitious materials (SCMs) in cement blends[J]. Cement and Concrete Research, 2019, 124: 105799.
[3] YANG L Y, JIA Z J, ZHANG Y M, et al. Effects of nano-TiO₂ on strength, shrinkage and microstructure of alkali activated slag pastes[J]. Cement and Concrete Composites, 2015, 57: 1-7.
[4] BONDAR D, LYNSDALE C J, MILESTONE N B, et al. Effect of type, form, and dosage of activators on strength of alkali-activated natural pozzolans[J]. Cement and Concrete Composites, 2011, 33(2): 251-260.
[5] MEHROTRA V P, SAI A S R, KAPUR P C. Plaster of Paris activated supersulfated slag cement[J]. Cement and Concrete Research, 1982, 12(4): 463-473.
[6] KÜHL H. Verfahren zur herstellung von zement aus hochofenschlacke: German, 237777[P]. 1908-12-23.
[7] MIDGLEY H G, PETTIFER K. The micro structure of hydrated super sulphated cement[J]. Cement and Concrete Research, 1971, 1(1): 101-104.
[8] GRUSKOVNJAK A, LOTHENBACH B, WINNEFELD F, et al. Hydration mechanisms of super sulphated slag cement[J]. Cement and Concrete Research, 2008, 38(7): 983-992.
[9] 孙正宁,周健,慕儒,等.新型超硫酸盐水泥水化硬化机理[J].硅酸盐通报,2019,38(8):2362-2368.
SUN Z N, ZHOU J, MU R, et al. Hydration and hardening mechanisms of newly developed supersulfated cement[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2362-2368 (in Chinese).
[10] 芮雅峰.掺硅钙渣复合胶凝材料新拌浆体的工作性及水化硬化研究[D].北京:中国矿业大学(北京),2019.
RUI Y F. Study on workability and hydration hardening of fresh slurry of silica calcium slag conforming to cementitious material[D].Beijing: China University of Mining and Technology (Beijing), 2019 (in Chinese).
[11] 浙江大学.石灰矿渣水泥[M].北京:建筑工程出版社,1958.
Zhejiang University. Lime slag cement[M]. Beijing: Architectural Engineering Press, 1958 (in Chinese).
[12] SHIMODA K, TOBU Y, KANEHASHI K, et al. Total understanding of the local structures of an amorphous slag: perspective from multi-nuclear (²⁹Si, ²⁷Al, ¹⁷O, ²⁵Mg, and ⁴³Ca) solid-state NMR[J]. Journal of Non-Crystalline Solids, 2008, 354(10/11): 1036-1043.
[13] NAGATAKI S, GOMI H. Expansive admixtures (mainly ettringite)[J]. Cement and Concrete Composites, 1998, 20(2/3): 163-170.
[14] 李化建,孙恒虎,铁旭初,等.热处理煤矸石活性评价方法的研究[J].煤炭学报,2006,31(5):654-658.
LI H J, SUN H H, TIE X C, et al. Study on activity evaluation of thermal treated gangue[J]. Journal of China Coal Society, 2006, 31(5): 654-658 (in Chinese).
[15] 袁润章,朱颉安,章丽云.粉煤灰火山灰活性与结构的关系及提高其活性的途径[J].武汉建材学院学报,1982,4(3):261-271.
YUAN R Z, ZHU J A, ZHANG L Y. The relation between the structure and the pozzolanic reactivity of fly ash, and the way for increasing its reactivity[J]. Journal of Wuhan Institute of Building Materials, 1982, 4(3): 261-271 (in Chinese).
[16] BLACK L, GARBEV K, STEMMERMANN P, et al. Characterisation of crystalline C-S-H phases by X-ray photoelectron spectroscopy[J]. Cement and Concrete Research, 2003, 33(6): 899-911.
[17] 杨长辉,刘本万,向晓斌,等.碱矿渣水泥石抗碳硫硅钙石型硫酸盐腐蚀性能[J].建筑材料学报,2015,18(1):44-48.
YANG C H, LIU B W, XIANG X B, et al. Resistance of alkali-activated slag cement to thaumasite sulfate attack[J]. Journal of Building Materials, 2015, 18(1): 44-48 (in Chinese).
[18] 刘数华,王露,余保英.超硫酸盐水泥的水化机理及工程应用综述[J].混凝土世界,2018(10):46-51.
LIU S H, WANG L, YU B Y. The hydration mechanism of super-sulphate cement and its application[J]. China Concrete, 2018(10): 46-51 (in Chinese).
[19] JUENGER M C G, WINNEFELD F, PROVIS J L, et al. Advances in alternative cementitious binders[J]. Cement and Concrete Research, 2011, 41(12): 1232-1243.
[20] 成希弼,缪纪生.石膏矿渣水泥强度发展的研究[J].硅酸盐学报,1962(4):175-189.
CHENG X B, MIAO J S. Study on the strength development of gypsum slag cement[J]. Journal of the Chinese Ceramic Society, 1962(4): 175-189 (in Chinese).
[21] LERCH W. The influence of gypsum on the hydration and properties of Portland cement pastes[J]. Proceedings of the American Society for Testing Materials, 1946, 46: 1252.
[22] TAYLOR H F W. Cement chemistry[M]. London: Thomas Telford Publishing, 1997.
[23] 国家质量监督检验检疫总局,中国国家标准化管理委员会.中热硅酸盐水泥、低热硅酸盐水泥:GB/T 200—2017[S].北京:中国标准出版社,2017.
General Administration of Quality Supervision, Inspection and Quarantine, Standardization Administration of China. Medium heat Portland cement, low heat Portland cement: GB/T 200—2017[S]. Beijing: China Standards Press, 2017 (in Chinese).
[24] 邱贤荣,汪澜齐,砚勇.石膏矿渣水泥早期水化机理的研究[C]//第九届全国石膏技术交流大会暨展览会论文集,2014,6:18-20.
QIU X R, WANG L Q, YAN Y. Study on early hydration mechanism of gypsum slag cement[C]//Proceedings of the 9th National Gypsum Technology Exchange Conference and Exhibition, 2014, 6: 18-20 (in Chinese).
[25] GROUNDS T, NOWELL D V, WILBURN F W. Resistance of supersulfated cement to strong sulfate solutions[J]. Journal of Thermal Analysis and Calorimetry, 2003, 72(1): 181-190.
[26] OSBORNE G J. Durability of Portland blast-furnace slag cement concrete[J]. Cement and Concrete Composites, 1999, 21(1): 11-21.
[27] 陈智丰,张振秋,周健.高抗折超硫酸盐水泥及其制备方法:CN107827379A[P].2018-03-23.
CHEN Z F, ZHSNG Z Q, ZHOU J. High flexural supersulfate cement and its preparation method: CN107827379A[P]. 2018-03-23 (in Chinese).
[28] OGAWA K, ROY D M. C₄A₃S hydration, ettringite formation, and its expansion mechanism: ii. microstructural observation of expansion[J]. Cement and Concrete Research, 1982, 12(1): 101-109.
[29] 韩建国,阎培渝,侯维红.C₄A₃S-CaSO₄-CaO体系在硅酸盐水泥浆体中的膨胀能力[J].硅酸盐学报,2016,44(8):1120-1125.
HAN J G, YAN P Y, HOU W H. Expansion character of C₄A₃S-CaSO₄-CaO system in Portland cement paste[J]. Journal of the Chinese Ceramic Society, 2016, 44(8): 1120-1125 (in Chinese).
[30] 吴中伟.绿色高性能混凝土与科技创新[J].建筑材料学报,1998,1(1):1-7.
WU Z W. Green high performance concrete and innovation[J]. Journal of Building Materials, 1998, 1(1): 1-7 (in Chinese).