Hydration Mechanism of Silicomanganese Slag-Circulating Fluidized Bed Combustion Ash Composite Supplementary Cementitious Materials

Abstract

Abstract: Lower early hydration activity is one of the important factors limiting the application of higher content smelting slag in the cementitious materials system. In this study, silicomanganese slag (SM) was activated by sulfate in circulating fluidized bed combustion ash (CFBA), and the hydration process and activity development of SM-CFBA composite supplementary cementitious materials were studied. Results show that the fluidity of mortars prepared by using SM-CFBA composite supplementary cementitious materials decreases significantly with the increase of CFBA. However, early and later activity of SM-CFBA composite supplementary cementitious materials are effectively improved with the increase of CFBA. When the content of CFBA is 10% (mass fraction) in SM-CFBA composite supplementary cementitious materials, 3 d, 7 d, and 28 d strength activity indexes of them reach 61%, 71%, and 95%, respectively, which is higher than those of SM (3 d, 7 d, and 28 d strength activity indexes are 50%, 53%, and 81%, respectively). The incorporation of CFBA stimulates the early hydration of cement and supplementary cementitious materials, and delays the transformation of ettringite into monosulfur-type hydrated calcium sulfoaluminate (AFm) during the hydration process, which allows early hydration of the cementitious materials to form more ettringite.

Key words: silicomanganese slag, circulating fluidized bed combustion ash, composite supplementary cementitious material, activity index, hydration, fluidity

CLC Number:

TQ172

LIU Qiang, ZHOU Fei, ZHANG Junjin, LU Zhongyuan, HU Jun, LI Xiaoying, HOU Li, CHEN Xuemei, ZHONG Wen, LI Jun. Hydration Mechanism of Silicomanganese Slag-Circulating Fluidized Bed Combustion Ash Composite Supplementary Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1715-1723.

References

[1] SCHNEIDER M, ROMER M, TSCHUDIN M, et al. Sustainable cement production: present and future[J]. Cement and Concrete Research, 2011, 41(7): 642-650.
[2] 黄弘,唐明亮,沈晓冬,等.工业废渣资源化及其可持续发展(Ⅱ):与水泥混凝土工业相结合走可持续发展之路[J].材料导报,2006,20(s1):455-458.
HUANG H, TANG M L, SHEN X D, et al. The resourcing of industrial waste and its sustainable development (Ⅱ): combine tightly with cement and concrete industry for sustainable development[J]. Materials Review, 2006, 20(s1): 455-458 (in Chinese).
[3] 冯春花,冯爱虎,李东旭.辅助性胶凝材料反应程度与水泥力学性能关系研究[J].硅酸盐通报,2013,32(12):2410-2416.
FENG C H, FENG A H, LI D X. Study on relationship between reaction degree of supplementary cementitious materials and mechanical performances of cement[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(12): 2410-2416 (in Chinese).
[4] 马悦.常用矿物掺合料对水泥基材料的性能影响研究[D].合肥:安徽建筑大学,2015.
MA Y. The influence of common mineral admixtures on the performance of cement-based materials[D]. Hefei: Anhui Jianzhu University, 2015 (in Chinese).
[5] 王帅.高钛矿渣-钢渣-硅灰复合矿物掺合料在混凝土中的应用研究[D].绵阳:西南科技大学,2021.
WANG S. Application of high titanium slag-steel slag-silica fume composite mineral admixture in concrete[D]. Mianyang: Southwest University of Science and Technology, 2021 (in Chinese).
[6] KUMAR S, GARCÍA-TRIÑANES P, TEIXEIRA-PINTO A, et al. Development of alkali activated cement from mechanically activated silico-manganese (SiMn) slag[J]. Cement and Concrete Composites, 2013, 40: 7-13.
[7] CHOI H B, KIM J M. Properties of silicon manganese slag as an aggregate for concrete depending on cooling conditions[J]. Journal of Material Cycles and Waste Management, 2020, 22(4): 1067-1080.
[8] 周祥,赵华堂,李亮,等.Si-Mn矿粉粒度对复合胶凝体系水化机理和力学性能的影响[J].材料导报,2021,35(s1):279-283.
ZHOU X, ZHAO H T, LI L, et al. Effect of particle size of Si-Mn slag on hydraulic mechanism and mechanical property in composite cementitious system[J]. Materials Reports, 2021, 35(s1): 279-283 (in Chinese).
[9] 赵艳荣,陈平,侯国龙,等.利用拜耳法赤泥激发锰渣活性的研究[J].非金属矿,2014,37(6):19-21.
ZHAO Y R, CHEN P, HOU G L, et al. Study on activation of manganese slag activity using bayer red mud[J]. Non-Metallic Mines, 2014, 37(6): 19-21 (in Chinese).
[10] 刘立柱,王勇,万军,等.水淬锰渣活性激发及其用于混凝土的试验研究[J].建材发展导向,2017,15(24):75-77.
LIU L Z, WANG Y, WAN J, et al. Experimental study on activation of water-quenched manganese slag and its use in concrete[J]. Development Guide to Building Materials, 2017, 15(24): 75-77 (in Chinese).
[11] 高燕.固硫灰复合矿物掺合料的制备及应用研究[D].绵阳:西南科技大学,2014.
GAO Y. Research on the preparation and application of CFBC fly ash compound mineral admixture[D]. Mianyang: Southwest University of Science and Technology, 2014 (in Chinese).
[12] 焦雷,卢忠远,江晓君.CFBC固硫灰和粉煤灰复掺作水泥混合材的研究[J].环境工程学报,2011,5(2):431-435.
JIAO L, LU Z Y, JIANG X J. Study on CFBC ash and fly ash compound as cement admixture material[J]. Chinese Journal of Environmental Engineering, 2011, 5(2): 431-435 (in Chinese).
[13] ZHANG S Q, SHI T Y, NI W, et al. The mechanism of hydrating and solidifying green mine fill materials using circulating fluidized bed fly ash-slag-based agent[J]. Journal of Hazardous Materials, 2021, 415: 125625.
[14] RICHARDSON I G, WILDING C R, DICKSON M J. The hydration of blastfurnace slag cements[J]. Advances in Cement Research, 1989, 2(8): 147-157.
[15] ZHOU J. Hydration of Portland cement blended with blast furnace slag at early stage[C]//2nd International RILEM Symposium on Advances in Concrete through Science and Engineering. Canada: RILEM Publications, 2006: 1-9.
[16] GRUYAERT E, ROBEYST N, DE BELIE N. Study of the hydration of Portland cement blended with blast-furnace slag by calorimetry and thermogravimetry[J]. Journal of Thermal Analysis and Calorimetry, 2010, 102(3): 941-951.
[17] ESCALANTE-GARCIA J I, SHARP J H. The effect of temperature on the early hydration of Portland cement and blended cements[J]. Advances in Cement Research, 2000, 12(3): 121-130.
[18] 钱觉时,余金城,孙化强,等.钙矾石的形成与作用[J].硅酸盐学报,2017,45(11):1569-1581.
QIAN J S, YU J C, SUN H Q, et al. Formation and function of ettringite in cement hydrates[J]. Journal of the Chinese Ceramic Society, 2017, 45(11): 1569-1581 (in Chinese).
[19] ZHANG T S, TIAN W L, GUO Y Q, et al. The volumetric stability, chloride binding capacity and stability of the Portland cement-GBFS pastes: an approach from the viewpoint of hydration products[J]. Construction and Building Materials, 2019, 205: 357-367.
[20] FRIAS M, SÁNCHEZ DE ROJAS M I, SANTAMARÍA J, et al. Recycling of silicomanganese slag as pozzolanic material in Portland cements: basic and engineering properties[J]. Cement and Concrete Research, 2006, 36(3): 487-491.
[21] 范志.钛矿渣-固硫灰辅助性胶凝材料的性能研究[D].绵阳:西南科技大学,2015.
FAN Z. Research on the properties of titanium slag-CFBC ash supplementary cementing material[D]. Mianyang: Southwest University of Science and Technology, 2015 (in Chinese).
[22] 杨惠芬.锰矿渣粉的活性效应研究[J].科技信息(学术研究),2008(18):92-93+95.
YANG H F. Study on activity effect of manganese slag powder[J]. Science & Technology Information (Academic Research), 2008(18): 92-93+95 (in Chinese).