Influence of Potassium-Based Alkaline Electrolyzed Water on Performance of Fly Ash Concrete

Abstract

Abstract: Alkaline electrolyzed water has the advantages of high activity, strong alkalinity, ionicity and adsorption. Alkaline electrolyzed water was used as mixing water of concrete to prepare fly ash concrete with different replacement ratios. The influence of alkaline electrolyzed water on the workability, mechanical properties and anti-chloride ion permeability performance was studied systemically. Combined with X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and differential thermal analysis experiments (TG/DTA), the hydration products and microstructure morphology of alkaline electrolyzed water fly ash concrete were analyzed. The results show that alkaline electrolyzed water promotes the early hydration reaction of cement in concrete and improves the workability of concrete. In addition to more C-S-H gels, Ca(OH)₂ and other hydration products, the potassium feldspars are also observed, which reduce porosity and improve the compactness of the structure, enhancing the mechanical properties and anti-permeability of concrete. Meanwhile, alkaline electrolyzed water stimulates the pozzolanic effect of fly ash at the early age to a certain extent, which accelerates the fracture of the glass network structure of fly ash in concrete. A large amount of SiO₂ and Al₂O₃ in fly ash dissolve and react with Ca(OH)₂ in concrete to produce more cementitious products such as calcium silicate and calcium aluminate. Compared with ordinary tap water concrete, when the replacement ratio of fly ash is 20% and 30% (mass fraction), the 56 d compressive strength of alkaline electrolyzed water concrete increase by 8.7% and 3.5%, respectively.

Key words: alkaline electrolyzed water, fly ash concrete, hydration reaction, mechanical property, anti-chloride ion permeability performance, microscopic morphology

CLC Number:

TU528

XIE Zixi, LIU Guibin, ZHANG Tianyu, LI Qiuyi, WANG Liang. Influence of Potassium-Based Alkaline Electrolyzed Water on Performance of Fly Ash Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 943-950.

References

[1] 苏彩丽,邢晓飞.粉煤灰对再生混凝土力学性能影响的试验研究[J].散装水泥,2020(5):99-100.
SU C L, XING X F. Experimental study on the influence of fly ash on the mechanical properties of recycled concrete[J]. Bulk Cement, 2020(5): 99-100 (in Chinese).
[2] 刘宝举,谢友均,李建.蒸养超细粉煤灰混凝土早期强度影响因素研究[J].混凝土,2003(1):13-15.
LIU B J, XIE Y J, LI J. Some factors affecting early comprssive strength of steam-curing concrete with ultra-fine fly ash[J]. Concrete, 2003(1): 13-15 (in Chinese).
[3] 穆大鹏,阎培渝.高钙粉煤灰混凝土的强度和干缩性能[J].混凝土,2004(11):31-34.
MU D P, YAN P Y. Strength and drying shrinkage of concrete containing high calcium fly ash[J]. Concrete, 2004(11): 31-34 (in Chinese).
[4] 丁鹏,杨健辉,李燕飞,等.硅灰粉煤灰混凝土早期强度试验研究[J].粉煤灰综合利用,2012,25(6):7-9.
DING P, YANG J H, LI Y F, et al. Experimental study on silica fume fly ash concrete early strength[J]. Fly Ash Comprehensive Utilization, 2012, 25(6): 7-9 (in Chinese).
[5] 成胜权,王琛,丁琳.饱和粉煤灰混凝土早期强度与含水率关系的试验研究[J].黑龙江大学工程学报,2012,3(2):17-21.
CHENG S Q, WANG C, DING L. Experimental study on saturated fly ash concrete early strength with water content[J]. Journal of Engineering of Heilongjiang University, 2012, 3(2): 17-21 (in Chinese).
[6] 汤青青,张丽娟,孙国文,等.三乙醇胺-氢氧化钙对大掺量粉煤灰水泥胶凝体系早期活性激发[J].硅酸盐通报,2018,37(9):2737-2742.
TANG Q Q, ZHANG L J, SUN G W, et al. Early activity of triethanolamine-calcium hydroxide activates to high volume fly ash in cement-gel system[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(9): 2737-2742 (in Chinese).
[7] 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).
[8] CAI J W, YAN S J, WEI G L, et al. Effects of fly ash and granular blast-furnace slag on development rate of strength of concrete[J]. Key Engineering Materials, 2014, 629/630: 371-375.
[9] 程智清,刘宝举,杨元霞,等.低温养护条件下粉煤灰混凝土早期强度研究[J].粉煤灰,2006,18(5):7-10.
CHENG Z Q, LIU B J, YANG Y X, et al. Study of early strength of fly ash concrete under condition of low-temperature curing[J]. Coal Ash China, 2006, 18(5): 7-10 (in Chinese).
[10] 孙炳全,王立久.碱性氧化还原电位水拌和混凝土性能初探[J].建筑材料学报,2009,12(1):112-115+126.
SUN B Q, WANG L J. Study on the properties of concrete mixed with alkaline redox potential water[J]. Journal of Building Materials, 2009, 12(1): 112-115+126 (in Chinese).
[11] 孙炳全,俸永格,林尤全,等.碱性氧化还原电位水理化性能及其应用[J].实验室研究与探索,2009,28(6):30-33.
SUN B Q, FENG Y G, LIN Y Q, et al. Physicochemical properties and applications of alkaline redox potential water[J]. Research and Exploration in Laboratory, 2009, 28(6): 30-33 (in Chinese).
[12] KOVTUN M, ZIOLKOWSKI M, SHEKHOVTSOVA J, et al. Direct electric curing of alkali-activated fly ash concretes: a tool for wider utilization of fly ashes[J]. Journal of Cleaner Production, 2016, 133: 220-227.
[13] MANDAL R, CHAKRABORTY S, CHAKRABORTY P, et al. Development of the electrolyzed water based set accelerated greener cement paste[J]. Materials Letters, 2019, 243: 46-49.
[14] CHAKRABORTY S, MANDAL R, CHATTOPADHYAY S, et al. Investigation on the effectiveness of electrolyzed water in controlling the early age properties of cement mortar[J]. Construction and Building Materials, 2019, 211: 1-11.
[15] WANG L, QUAN H Z. Effects of single and compound electrolyte electrolyzed cathode waters on mechanical property and hydration reaction of concrete[J]. Science of Advanced Materials, 2020, 12(3): 366-375.