The resistance of alkaline‐activated silico‐manganese fume (SMF) and blast furnace slag (BSF)‐based mortar, prepared by varying BFS and NaOH_aq composition, during 20 weeks of exposure to 5% sulfuric acid (H₂SO_4aq) of initial pH = 0.24 and pure water (controlled) was studied. The deterioration was monitored by visual, alkalinity, mass, compressive strength and microstructural tests. The set of specimens synthesized included: (a) BFS‐free high alkaline, (b) SMF‐BFS blended high alkaline, and (c) SMF‐BFS blended mild alkaline system. Their residual strengths after 20 weeks of acid exposure were 20.1, 18.6, and 16%, respectively. BFS‐free specimens exhibited high resistance to acid attack due to the dearth of Ca in SMF. BFS‐admixed mild alkali system resulted formation of more gypsum and dealumination attributed to incomplete dissolution of Ca grains leading to severe spalling. BFS‐admixed high alkaline system underwent moderate resistance due to dense microstructure formed by additional C‐S‐H, K‐A‐S‐H, and C‐Mn‐H gel which enhanced retention of the polymerized framework.

中文翻译：

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碱/矿渣活化的硅锰气雾基砂浆的耐硫酸性

在5％硫酸（H ₂ SO _4aq）中暴露20周后，通过改变BFS和NaOH_水溶液成分制备的碱活化硅锰烟雾（SMF）和高炉矿渣（BSF）基砂浆的_抗性），初始pH值= 0.24，并研究了纯水（受控）。通过视觉，碱度，质量，抗压强度和微观结构测试监测劣化。合成的样品包括：（a）无BFS的高碱性，（b）SMF-BFS混合的高碱性和（c）SMF-BFS混合的弱碱性系统。酸暴露20周后，它们的残余强度分别为20.1％，18.6％和16％。由于SMF中Ca的缺乏，不含BFS的样品对酸侵蚀表现出很高的抵抗力。BFS混合的弱碱系统导致更多的石膏形成和脱铝，这归因于Ca颗粒的不完全溶解导致严重的剥落。由于由额外的C‐H‐H，KA‐A‐H，