Effect of Potassium Hydroxide-Sodium Water Glass Activator on Properties of Alkali-Activated Slag Cementitious Materials

Abstract

Abstract: Potassium hydroxide was used to adjust the modulus of sodium water glass to prepare compound alkali activator. Taking sodium water glass modulus and alkali content as variables,the effect of potassium hydroxide on sodium water glass activated slag cementitious material performance was analyzed, and the change law of fluidity, setting time and compressive strength of potassium hydroxide-sodium water glass activated slag cementitious material was studied. The results show that the stimulating effects of potassium hydroxide-sodium water glass compound alkali activator are better than those of single sodium water glass activator. When the sodium water glass modulus is 1.2 and the alkali content is 8% (mass fraction), the fluidity of potassium hydroxide-sodium water glass activated slag cementitious materials reaches up to 240 mm, and the compressive strength of 7 d and 28 d reaches up to 98.88 MPa and 104.59 MPa, which is 16.7% and 22.9% higher than that of the sodium water glass activated slag cementitious materials under the same conditions.

Key words: potassium hydroxide, sodium water glass, compound alkali activator, alkali-activated slag cementitious material, fluidity, setting time, compressive strength

CLC Number:

TU528

WANG Lingling, SI Chenyu, LI Chang, SUN Xiaowei, ZHOU Honghong, GUO Shimeng. Effect of Potassium Hydroxide-Sodium Water Glass Activator on Properties of Alkali-Activated Slag Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2654-2662.

References

[1] 李相国,许金生,姜东兵,等.SAP内养护对碱激发矿渣胶凝材料性能的影响[J].硅酸盐通报,2021,40(10):3435-3441.
LI X G, XU J S, JIANG D B, et al. Effect of internal curing of SAP on properties of alkali-activated slag cementitious materials[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(10): 3435-3441 (in Chinese).
[2] 郑文忠,邹梦娜,王英.碱激发胶凝材料研究进展[J].建筑结构学报,2019,40(1):28-39.
ZHENG W Z, ZOU M N, WANG Y. Literature review of alkali-activated cementitious materials[J]. Journal of Building Structures, 2019, 40(1): 28-39 (in Chinese).
[3] JIN Y, FENG W P, ZHENG D P, et al. Study on the interaction mechanism between slags and alkali silicate activators: a hydration kinetics approach[J]. Construction and Building Materials, 2020, 250: 118900.
[4] LI C, SUN H H, LI L T. Reply to the discussion by John Provis of the review paper “A review: the comparison between alkali-activated slag (Si+Ca) and metakaolin (Si+Al) cements”[J]. Cement and Concrete Research, 2010, 40(12): 1768.
[5] 张耀君,杨梦阳,康乐,等.一类新型碱激发胶凝材料催化剂的研究进展[J].无机材料学报,2016,31(3):225-233.
ZHANG Y J, YANG M Y, KANG L, et al. Research progresses of new type alkali-activated cementitious material catalyst[J]. Journal of Inorganic Materials, 2016, 31(3): 225-233 (in Chinese).
[6] SAMANTASINGHAR S, SINGH S. Effects of curing environment on strength and microstructure of alkali-activated fly ash-slag binder[J]. Construction and Building Materials, 2020, 235: 117481.
[7] 王亚超.碱激发粉煤灰基地质聚合物强化增韧及耐久性能研究[D].西安:西安建筑科技大学,2014.
WANG Y C. Investigations on reinforcing, toughening and durability of alkali-activated fly ash-based geopolymer[D]. Xi'an: Xi'an University of Architecture and Technology, 2014 (in Chinese).[8] SAJEDI F, RAZAK H A. The effect of chemical activators on early strength of ordinary Portland cement-slag mortars[J]. Construction and Building Materials, 2010, 24(10): 1944-1951.
[9] AMER I, KOHAIL M, EL-FEKY M S, et al. A review on alkali-activated slag concrete[J]. Ain Shams Engineering Journal, 2021, 12(2): 1475-1499.
[10] 迟凤霞,韩博,程沁灵,等.激发剂内部参数对碱激发注浆材料性能的影响[J].硅酸盐通报,2021,40(5):1751-1759.
CHI F X, HAN B, CHENG Q L, et al. Effect of internal parameters of activator on performance of alkali-activated grouting material[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(5): 1751-1759 (in Chinese).
[11] 陈柯宇,吴大志,胡俊涛.基于组分的地聚合物胶凝材料反应机理及其制备参数的研究进展[J].硅酸盐通报,2020,39(7):2033-2041.
CHEN K Y, WU D Z, HU J T. Advances in the reaction mechanism and preparation parameters of geopolymer binder material based on components[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(7): 2033-2041 (in Chinese).
[12] 刘泽,周瑜,孔凡龙,等.碱激发矿渣基地质聚合物微观结构与性能研究[J].硅酸盐通报,2017,36(6):1830-1834.
LIU Z, ZHOU Y, KONG F L, et al. Microstructure and properties of alkali-activated blast furnace slag based geopolymer[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(6): 1830-1834 (in Chinese).
[13] 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).
[14] CAO R L, ZHANG S Q, BANTHIA N, et al. Interpreting the early-age reaction process of alkali-activated slag by using combined embedded ultrasonic measurement, thermal analysis, XRD, FTIR and SEM[J]. Composites Part B: Engineering, 2020, 186: 107840.
[15] 焦贞贞.碱激发矿渣胶凝材料砌块砌体基本力学性能研究[D].哈尔滨:哈尔滨工业大学,2019.
JIAO Z Z. Study on basic mechanical properties of alkali-activated slag cementitious material block masonry[D]. Harbin: Harbin Institute of Technology, 2019 (in Chinese).