Alkali silicate activated slag and class F fly ash‐based binders are ambient curing, structural materials that are feasible replacements for ordinary Portland cement (OPC). They exhibit advantageous mechanical properties and less environmental impact than OPC. In this work, five sodium silicate activated slag‐fly ash binder mixtures were developed and their compressive and flexural strengths were studied as a function of curing temperature and time. It was found that the strongest mixture sets at ambient temperature and had a Weibull average flexural strength of 5.7 ± 1.5 MPa and Weibull average compressive strength of 60 ± 8 MPa at 28 days. While increasing the slag/fly ash ratio accelerated the strength development, the cure time was decreased due to the formation of calcium silicate hydrate (C–S–H), calcium aluminum silicate hydrate (C–A–S–H), and (Ca,Na) based geopolymer. The density, microstructure, and phase evolution of ambient‐cured, heat‐cured, and heat‐treated binders were studied using pycnometry, scanning electron microscopy, energy dispersive X‐ray spectroscopy (SEM‐EDS), and X‐ray diffraction (XRD). Heat‐cured binders were more dense than ambient‐cured binder. No new crystalline phases evolved through 28 days in ambient‐ or heat‐cured binders.

中文翻译：

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硅酸钠活化的粉煤灰粘结剂：第一部分–加工，微观结构和机械性能

碱金属硅酸盐活性矿渣和F级粉煤灰基粘结剂是常温固化的结构材料，是普通波特兰水泥（OPC）的可行替代品。与OPC相比，它们具有优越的机械性能和对环境的影响小。在这项工作中，开发了五种硅酸钠活化的矿渣-粉煤灰粘结剂混合物，并研究了它们的抗压强度和抗弯强度与固化温度和时间的关系。发现最强的混合物在环境温度下凝固，在28天时的威布尔平均抗弯强度为5.7±1.5 MPa，威布尔平均抗压强度为60±8 MPa。在提高炉渣/粉煤灰比的同时，加速了强度的发展，但由于形成了水合硅酸钙（C–S–H），水合硅酸铝钙（C–A–S–H）而缩短了固化时间，和（钙，钠）基地质聚合物。使用比重瓶，扫描电子显微镜，能量色散X射线能谱（SEM-EDS）和X射线衍射（XRD）研究了环境固化，热固化和热处理的粘合剂的密度，微观结构和相演化）。热固化的粘合剂比环境固化的粘合剂致密。在环境固化或热固化的粘合剂中，经过28天没有新的结晶相析出。