Huang Yuyan, Marsh Alastair T M, Yue Zengliang, Krishnan Sreejith, Adu-Amankwah Samuel, Bernal Susan A
School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
Department of Civil and Infrastructure Engineering, Indian Institute of Technology Jodhpur, Jodhpur 342011, India.
ACS Omega. 2024 Aug 9;9(33):35888-35905. doi: 10.1021/acsomega.4c04857. eCollection 2024 Aug 20.
Hybrid organic-inorganic binders based on blast furnace slag were produced using sodium (NaAc) or potassium (KAc) acetate as the sole activator, and their properties were compared with those of sodium- or potassium hydroxide-activated slag pastes. The acetate-activated binders showed significantly lower cumulative heat release and extended setting time (∼230 h) than the hydroxide-activated binders. The main reaction products forming in all binders were calcium aluminosilicate hydrate-type gels and a hydrotalcite-like phase, independently of the activator type used. Compressive strengths of the acetate-activated pastes (∼40 MPa at 180 days) were lower than those of the hydroxide-activated binders (∼80 MPa at 180 days). However, the acetate-based binders exhibited superior impermeability and reduced wettability at 28 days, likely due to hydrophobic acetate groups. It is hypothesized that acetates dissociate in water, forming calcium acetate and alkali silicates via a reaction with species dissolving from the slag. This study demonstrates alkali acetates are effective activators for creating hybrid slag-based binders with reduced permeability.
基于高炉矿渣的有机-无机混合粘结剂是以醋酸钠（NaAc）或醋酸钾（KAc）作为唯一活化剂制备的，并将其性能与氢氧化钠或氢氧化钾活化的矿渣浆体进行了比较。与氢氧化物活化的粘结剂相比，醋酸盐活化的粘结剂的累积热释放显著更低，凝结时间延长（约230小时）。所有粘结剂中形成的主要反应产物都是水化硅酸钙凝胶和类水滑石相，与所使用的活化剂类型无关。醋酸盐活化浆体的抗压强度（180天时约为40MPa）低于氢氧化物活化的粘结剂（180天时约为80MPa）。然而，基于醋酸盐的粘结剂在28天时表现出优异的抗渗性和降低的润湿性，这可能归因于疏水性的醋酸基团。据推测，醋酸盐在水中解离，通过与从矿渣中溶解出来的物质反应形成醋酸钙和碱金属硅酸盐。本研究表明，碱金属醋酸盐是制备具有降低渗透性的混合矿渣基粘结剂的有效活化剂。
