Effects of Temperature and Activator Concentration on Rheological Properties of Alkali Activated Slag Paste

Abstract

Abstract: In order to obtain the effects of temperature and activator concentration on the rheological properties of alkali activated slag paste, NaOH was used as the activator and S95 granulated blast furnace slag was used as the activated component. The variation characteristics of yield stress and apparent viscosity of slag paste during setting and hardening were discussed at different activator concentrations (1 mol/L, 2 mol/L and 3 mol/L) and temperatures (20 ℃, 30 ℃ and 40 ℃). The results show that the slag paste with NaOH as the activator shows non-Newtonian characteristy, and the yield stress development conforms to the Bingham fluid model. The higher the concentration and temperature of the activator, the faster the alkali activated slag paste yield stress develops, but the duration of the yield stress stability period and growth period are shortened with the increase of the concentration and temperature of the activator. The time-varying model of apparent viscosity can be represented by η=η₀+e-btⁿ, and the initial apparent viscosity η₀, b and n values all increase with the increase of temperature and the concentration of activator.

Key words: alkali activated slag, temperature, activator concentration, rheological property, yield stress, time varying model

CLC Number:

TU528

TAO Jun, TANG Jianhui, LI Ping, BAI Yin, LIU Jian, WEN Donghui. Effects of Temperature and Activator Concentration on Rheological Properties of Alkali Activated Slag Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3442-3449.

References

[1] 刘潮,水中和,高旭,等.碱激发煤矸石-高炉矿渣复合材料性能评价[J].硅酸盐通报,2020,39(9):2877-2884.
LIU C, SHUI Z H, GAO X, et al. Performance evaluation of alkali-activated coal gangue-blast furnace slag composite[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(9): 2877-2884 (in Chinese).
[2] 伍勇华,胡宇博,南峰,等.粉煤灰对碱激发矿渣胶凝材料耐盐酸腐蚀性能的影响[J].硅酸盐通报,2019,38(4):1166-1170+1176.
WU Y H, HU Y B, NAN F, et al. Effect of fly ash on hydrochloric acid corrosion resistance of alkali-activated slag cementitious materials[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(4): 1166-1170+1176 (in Chinese).
[3] ZHU H J, LIANG G W, LI H X, et al. Insights to the sulfate resistance and microstructures of alkali-activated metakaolin/slag pastes[J]. Applied Clay Science, 2021, 202: 105968.
[4] 李爽,刘和鑫,杨永,等.碱激发矿渣/偏高岭土复合胶凝材料干燥收缩机理研究[J].材料导报,2021,35(4):4088-4091.
LI S, LIU H X, YANG Y, et al. Mechanisms of drying shrinkage for alkali-activated slag/metakaolin composite materials[J]. Materials Reports, 2021, 35(4): 4088-4091 (in Chinese).
[5] 吴俊,征西遥,杨爱武,等.矿渣-粉煤灰基地质聚合物固化淤泥质黏土的抗压强度试验研究[J].岩土力学,2021,42(3):647-655.
WU J, ZHENG X Y, YANG A W, et al. Experimental study on the compressive strength of muddy clay solidified by the one-part slag-fly ash based geopolymer[J]. Rock and Soil Mechanics, 2021, 42(3): 647-655 (in Chinese).
[6] 张发文.矿渣胶凝材料胶结矿山尾砂充填性能及机理研究[D].武汉:武汉大学,2009.
ZHANG F W. Investigations on solidified charactertics and mechanism of slag cementitious materials in mine filling[D]. Wuhan: Wuhan University, 2009 (in Chinese).
[7] PUERTAS F, VARGA C, ALONSO M M. Rheology of alkali-activated slag pastes. Effect of the nature and concentration of the activating solution[J]. Cement and Concrete Composites, 2014, 53: 279-288.
[8] YANG T, ZHU H J, ZHANG Z H, et al. Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes[J]. Cement and Concrete Research, 2018, 109: 198-207.
[9] 杨长辉,黄南菊,谢欢,等.氧化石墨烯对碱矿渣胶结材浆体流变性能的影响[J].建筑材料学报,2018,21(6):855-863.
YANG C H, HUANG N J, XIE H, et al. Effect of graphene oxide on the rheological properties of alkali-activated slag paste[J]. Journal of Building Materials, 2018, 21(6): 855-863 (in Chinese).
[10] 相继春,邓笑波,李林鸿,等.石灰石粉对碱激发胶凝体系流变性能的影响[J].广西大学学报(自然科学版),2018,43(6):2347-2354.
XIANG J C, DENG X B, LI L H, et al. Effect of limestone powder on rheological properties of alkali-activated cementitious system[J]. Journal of Guangxi University (Natural Science Edition), 2018, 43(6): 2347-2354 (in Chinese).
[11] 殷素红,管海宇,胡捷,等.碱激发粉煤灰-矿渣灌浆材料的流变性与流动性[J].华南理工大学学报(自然科学版),2019,47(8):120-128+135.
YIN S H, GUAN H Y, HU J, et al. Rheological properties and fluidity of alkali-activated fly ash-slag grouting material[J]. Journal of South China University of Technology (Natural Science Edition), 2019, 47(8): 120-128+135 (in Chinese).
[12] 邵鸿飞,刘元俊,任万杰,等.非牛顿流体黏度测试方法及标准物质研究进展[J].宇航计测技术,2019,39(s1):1-5.
SHAO H F, LIU Y J, REN W J, et al. Research progress of viscosity measurement methods and reference materials for non-Newtonian fluids[J]. Journal of Astronautic Metrology and Measurement, 2019, 39(s1): 1-5 (in Chinese).
[13] JIANG H Q, FALL M, LIANG C. Yield stress of cemented paste backfill in sub-zero environments: experimental results[J]. Minerals Engineering, 2016, 92: 141-150.
[14] WU D, FALL M, CAI S J. Coupling temperature, cement hydration and rheological behaviour of fresh cemented paste backfill[J]. Minerals Engineering, 2013, 42: 76-87.
[15] LI P, TANG J H, BAI Y, et al. Experimental study on the pH for activating ground granulated blast-furnace slag activity at different temperatures[J]. Sadhana-Academy Proceedings in Engineering Sciences, 2019, 44(10): 1-12.