Ceramics-Silikáty |
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INFLUENCE OF DIRECT CURRENT IN ALKALI-ACTIVATED FLY ASH PASTES
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Jiao Xiaodong 1,3,4, Li Hui 1,2, Xiong Jianping 3,4, Zheng Wukui 1,2, Zhang Yangpeng 3, 4, Lu Cuifang 3, 4
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1 College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2 Ecological Cement Engineering Research Center of Ministry of Education, Xi’an 710055, China
3 Guangxi Key Lad of Road Structure and Materials, Nanning 53007, China
4 Guangxi Transportation Science and Technology Group Co., Ltd, Nanning 53007, China
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Keywords: Alkali-activated fly ash, Electric current, Strength development, Hydroxy-sodalite
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As a low-carbon and environmentally friendly material, alkali-activated fly ash (AAFA) has attracted considerable research attention. However, its strength development at room temperature is often too slow, which limits its practical application. In this study, a direct current (DC) field was applied during the curing of AAFA pastes to improve their early performance. The effects on the curing temperature, resistivity, and compressive strength development were systematically investigated. After 1 h of electric curing, a mixture with 11.6% Na₂O and a water/binder ratio of 0.38 obtained a compressive strength of 13.8 MPa at 3 days. The strength continued to increase under ambient curing, reaching 24.8 MPa at 28 days. The XRD and SEM results revealed the formation of an aluminosilicate gel and hydroxy-sodalite (Na₆(AlSiO₄)₆·8H₂O) within a short period of direct electric curing, which contributes to the strength improvement of AAFA pastes. |
doi: 10.13168/cs.2026.0007
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