Abstract
Alkaline electrolyzed water, a kind of clean green water with excellent characteristics such as high activity, strong alkalinity, high ion penetrating ability, electrical charge, and good molecule adsorption, was significant to the resource utilization of industrial fly ash waste. This paper studies highly active potassium-based alkaline electrolyzed water’s impact, compared with ordinary water, on the cement hydration process using microstructural methods such as a hydration heat test, differential thermal analysis, X-ray diffraction (XRD) pattern, and Scanning electron microscope (SEM) image analysis. Fly ash cement-based materials were first prepared with alkaline electrolyzed water as the mixing water. The alkaline electrolyzed water’s influence on fly ash paste workability and the mechanical properties of fly ash mortar for varying fly ash proportions were ratified. Then alkaline electrolyzed water with the best pH value was selected to prepare fly ash concrete, and its durability was studied. The test results showed that it is feasible to increase the utilization rate of fly ash by using alkaline electrolyzed water. Furthermore, it promoted the process of cement hydration, increased the rate of the hydration reaction, and the promotion effect increased with the increase in pH value of the alkaline electrolyzed water, and also promoted the effective decomposition of the vitreous shell of fly ash to stimulate its early activity. Concurrent tests with ordinary water paste showed that the water requirement for normal consistency and setting time with alkaline electrolyzed water paste were significantly less. Alkaline electrolyzed water also solved the problem related to the low early strength of fly ash mortar. Furthermore, using alkaline electrolyzed water with an optimum pH value of 11.5 to prepare fly ash concrete effectively reduced concrete’s carbonation depth and carbonation rate and lessened the chloride ion migration coefficient.
Highlights
With the rapid development of the energy and electric power industries, the total fly ash (FA) emitted by coal-fired thermal power plants has increased yearly
Ordinary water (OW) pH = 7.6 refers to ordinary water with a pH value of 7.6, Alkaline electrolytic water (AEW) pH = 9.5 refers to alkaline electrolytic water with a pH value of 9.5, AEW pH = 10.5 refers to alkaline electrolytic water with a pH value of 10.5, and AEW pH = 11.5 refers to alkaline electrolytic water with a pH value of 11.5
The influence of alkaline electrolysis water on the cement hydration process was analyzed through hydration heat and differential thermal testing
Summary
With the rapid development of the energy and electric power industries, the total fly ash (FA) emitted by coal-fired thermal power plants has increased yearly. As FA is the leading industrial solid waste, its efficient resource reuse is in line with the technical and economic policy of turning waste into treasure and meeting global sustainable development requirements [4,5,6,7,8]. The preparation of high-performance concrete with FA as an active mineral admixture is the leading research direction for the high-efficiency worldwide utilization of FA. The metastable vitreous structure in FA has high chemical stability that requires a long time to excite its activity. This characteristic causes the slow exertion of the activity effect and the low early strength of concrete prepared by it, significantly limiting the development of fly ash concrete (FAC)
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