Effects of Antifreeze and Early-Strength Agent on Hydration of Sulphoaluminate Cement under Sub-Zero Temperature

Abstract

Abstract: The effects of different antifreeze and early-strength agent on strength, microstructure and hydration products of sulphoaluminate cement (SAC) mortar curing at -20 ℃ for 7 d and 28 d without pre-curing were investigated. Mechanical property test, ultrasonic wave velocity test, mercury intrusion porosimetry (MIP) test, thermogravimetric (TG) analysis, X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) analysis were used. The results show that, the combination of inorganic antifreeze calcium nitrate with early-strength agents aluminum sulfate and triethanolamine promote the SAC hydration and microstructure development, which improve the mortar strength. The combination of organic antifreeze urea and calcium nitrate delays the SAC hydration and microstructure development, which reduce the mortar strength. Mortar with lower water-cement ratio show denser microstructure and higher strength. Ultrasonic wave velocity can characterize the microstructure development of mortar during heating process, which has a certain correlation with mortar strength.

Key words: sulphoaluminate cement, antifreeze, early-strength agent, sub-zero temperature, hydration

CLC Number:

TU528.31

LIU Yunpeng, LI Junhao, YANG Chao, LIU Zhichao. Effects of Antifreeze and Early-Strength Agent on Hydration of Sulphoaluminate Cement under Sub-Zero Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 359-367.

References

[1] 张思佳,纪国晋,陈建国,等.-10 ℃即时受冻条件下外加剂和掺和料对负温混凝土性能影响[J].建筑材料学报,2018,21(4):649-655.
ZHANG S J, JI G J, CHEN J G, et al. Effects of chemical and mineral admixtures on negative temperature concrete in the instant freezing condition of -10 ℃[J]. Journal of Building Materials, 2018, 21(4): 649-655 (in Chinese).
[2] 王稷良,孙小彬,杨志峰.防冻组分对水泥混凝土性能的影响研究[J].硅酸盐通报,2014,33(12):3331-3337.
WANG J L, SUN X B, YANG Z F. Influence of anti-freezing components on the properties of cement concrete[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(12): 3331-3337 (in Chinese).
[3] 巴恒静,何忠茂.负温混凝土早期结构的形成与水化[J].低温建筑技术,1991,13(2):44-46.
BA H J, HE Z M. Early structures formation and hydration of sub-zero temperature concrete[J]. Low Temperature Architecture Technology, 1991, 13(2): 44-46 (in Chinese).
[4] KARAGOL F, DEMIRBOGA R, KHUSHEFATI W H. Behavior of fresh and hardened concretes with antifreeze admixtures in deep-freeze low temperatures and exterior winter conditions[J]. Construction and Building Materials, 2015, 76: 388-395.
[5] 董淑慧,陶成云,江守恒,等.负温水泥基灌浆料的抗压强度研究[J].混凝土,2019(11):171-173.
DONG S H, TAO C Y, JIANG S H, et al. Research on the compressive strength of cement-based grout under sub-zero temperature[J]. Concrete, 2019(11): 171-173 (in Chinese).
[6] WANG P M, LI N, XU L L. Hydration evolution and compressive strength of calcium sulphoaluminate cement constantly cured over the temperature range of 0 to 80 ℃[J]. Cement and Concrete Research, 2017, 100: 203-213.
[7] HU C L, HOU D S, LI Z J. Micro-mechanical properties of calcium sulfoaluminate cement and the correlation with microstructures[J]. Cement and Concrete Composites, 2017, 80: 10-16.
[8] 邓君安,李德栋,李启棣,等.硫铝酸盐早强水泥负温下的水化硬化[J].硅酸盐学报,1983,11(1):85-94.
DENG J A, LI D D, LI Q D, et al. The hydration and hardening of high early strength sulfoaluminate cement under subzero performance[J]. Journal of the Chinese Ceramic Society, 1983, 11(1): 85-94 (in Chinese).
[9] 于海洋.受冻混凝土的早期变形及冻害机理分析[D].哈尔滨:哈尔滨工业大学,2016.
YU H Y. The early-age deformation and frost damage of concrete under sub-zero temperature[D]. Harbin: Harbin Institute of Technology, 2016 (in Chinese).
[10] 杨英姿,巴恒静.负温防冻剂混凝土的界面显微结构与性能[J].硅酸盐学报,2007,35(8):1125-1130.
YANG Y Z, BA H J. Interface microstructure and mechanical properties of concrete with antifreezing admixture at subzero temperatures[J]. Journal of the Chinese Ceramic Society, 2007, 35(8): 1125-1130 (in Chinese).
[11] 李沛然.硅酸盐—硫铝酸盐复合胶凝材料的低温水化与微观特征[D].哈尔滨:哈尔滨工业大学,2016.
LI P R. Hydration and micro performance of ordinary Portland cement blending with calcium sulfoaluminate cement at low temperature[D]. Harbin: Harbin Institute of Technology, 2016 (in Chinese).
[12] 张金喜,金珊珊.水泥混凝土微观孔隙结构及其作用[M].北京:科学出版社,2014:3-14.
ZHANG J X, JIN S S. Micro pore structure of cement concrete and its function[M]. Beijing: Science Press, 2014: 3-14 (in Chinese).
[13] 鲍俊玲,李悦,谢冰,等.水泥混凝土孔结构研究进展[J].商品混凝土,2009(10):18-20+58.
BAO J L, LI Y, XIE B, et al. Research development of cement concrete pore[J]. Ready-Mixed Concrete, 2009(10): 18-20+58 (in Chinese).
[14] JAMBOR J. Pore structure and strength development of cement composites[J]. Cement and Concrete Research, 1990, 20(6): 948-954.
[15] 王培铭,李楠,徐玲琳,等.低温养护下硫铝酸盐水泥的水化进程及强度发展[J].硅酸盐学报,2017,45(2):242-248.
WANG P M, LI N, XU L L, et al. Hydration characteristics and strength development of sulphoaluminate cement cured at low temperature[J]. Journal of the Chinese Ceramic Society, 2017, 45(2): 242-248 (in Chinese).
[16] 阮承祥.混凝土外加剂及其工程应用[M].南昌:江西科学技术出版社,2008:291-311.
RUAN C X. Concrete admixtures and their engineering applications[M]. Nanchang: Jiangxi Science and Technology Press, 2008: 291-311.
[17] 赵苏,郭兴华,田静,等.三乙醇胺在水泥-水界面的吸附现象及其促凝作用[J].混凝土,2010(4):66-70.
ZHAO S, GUO X H, TIAN J, et al. Adsorption phenomenon of triethanolmine on the cement-water interface and accelerating effect[J]. Concrete, 2010(4): 66-70 (in Chinese).
[18] 叶正茂,芦令超,常钧,等.硫铝酸盐水泥基防渗堵漏材料凝结时间调控机制的研究[J].硅酸盐通报,2005,24(4):58-61+65.
YE Z M, LU L C, CHANG J, et al. Study on the control mechanism of setting time for the sulphoaluminate cement- based waterproof material[J]. Bulletin of the Chinese Ceramic Society, 2005, 24(4): 58-61+65 (in Chinese).
[19] 杨克锐,张彩文,郭永辉,等.延缓硫铝酸盐水泥凝结的研究[J].硅酸盐学报,2002,30(2):155-160.
YANG K R, ZHANG C W, GUO Y H, et al. Study on retarding the set of sulphoaluminate cement[J]. Journal of the Chinese Ceramic Society, 2002, 30(2): 155-160 (in Chinese).
[20] BIZZOZERO J, SCRIVENER K L. Limestone reaction in calcium aluminate cement-calcium sulfate systems[J]. Cement and Concrete Research, 2015, 76: 159-169.
[21] WINNEFELD F, LOTHENBACH B. Hydration of calcium sulfoaluminate cements—Experimental findings and thermodynamic modelling[J]. Cement and Concrete Research, 2010, 40(8): 1239-1247.
[22] SCRIVENER K, SNELLINGS R, LOTHENBACH B. A practical guide to microstructural analysis of cementitious materials[M]. Boca Raton: CRC Press, 2018.