Durability of concrete containing fly ash and silica fume against 1 combined freezing-thawing and sulfate attack 2 Dezhi Wang a,b* , Xiangming Zhou a , Yunfang Meng b , and Zhen Chen c 3 a College of Civil & Water Conservancy Engineering, Ningxia University, Yinchuan 4 750021,China 5 b Department of Mechanical, Aerospace and Civil Engineering, Brunel University 6 London, Uxbridge, Middlesex UB8 3PH, United Kingdom 7 c Department of Water Conservancy, Wuqing District, Tianjin 301700, China 8 9 Abstract: 10 Durability of concrete containing fly ash (FA) and silica fume (SF) against combined 11 freezing-thawing and sulfate attack was studied in this paper. Concretes with w/b of 12 0.38 and 0.33 containing FA (i.e. of 10%, 15% and 25% by weight) and SF (i.e. of 5%, 13 8% and 11% also by weight) as partial replacement of Portland cement (PC) were 14 exposed to 5% and 10% sodium sulfate solution under freezing–thawing cycles. The 15 performance, including deterioration resistant coefficient of compressive strength, 16 relative dynamic elastic modulus (RDEM) and microstructure, of concretes were 17 evaluated after being subjected to certain freezing-thawing cycles in sodium sulfate 18 solution. It was found that when exposed to 5% sodium sulfate solution, both FA and 19 SF can improve concrete’s resistance to sulfate attack and in comparison SF 20 performed better than FA. Concrete deterioration was attributed to the interaction 21 * Corresponding author at: College of Civil & Water Conservancy Engineering, Ningxia University, Yinchuan 750021,China. E-mail address: [email protected] (Dezhi Wang).
Durability of concrete containing fly ash and silica fume against combined freezing-thawing and sulfate attack
Apr 25, 2023
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