Yang Hyun-Min, Kwon Seung-Jun, Myung Nosang Vincent, Singh Jitendra Kumar, Lee Han-Seung, Mandal Soumen
Innovative Durable Building and Infrastructure Research Center, Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangnok-gu, Ansan 15588, Korea.
Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA.
Materials (Basel). 2020 Jan 17;13(2):442. doi: 10.3390/ma13020442.
Ground granulated blast furnace slag (GGBFS) conventionally has been incorporated with ordinary Portland cement (OPC) owing to reduce the environmental load and enhance the engineering performance. Concrete with GGBFS shows different strength development of normal concrete, but sensitive, to exterior condition. Thus, a precise strength evaluation technique based on a quantitative model like full maturity model is required. Many studies have been performed on strength development of the concrete using equivalent age which is based on the apparent activation energy. In this process, it considers the effect of time and temperature simultaneously. However, the previous models on the apparent activation energy of concrete with mineral admixtures have limitation, and they have not considered the effect of temperature on strength development. In this paper, the apparent activation energy with GGBFS replacement ratio was calculated through several experiments and used to predict the compressive strength of GGBFS concrete. Concrete and mortar specimens with 0.6 water/binder ratio, and 0 to 60% GGBFS replacement were prepared. The apparent activation energy () was experimentally derived considering three different curing temperatures. Thermodynamic reactivity of GGBFS mixed concrete at different curing temperature was applied to evaluate the compressive strength model, and the experimental results were in good agreement with the model. The results show that when GGBFS replacement ratio was increased, there was a delay in compressive strength.
磨细粒化高炉矿渣（GGBFS）传统上一直与普通硅酸盐水泥（OPC）混合使用，以降低环境负荷并提高工程性能。含有GGBFS的混凝土表现出与普通混凝土不同的强度发展情况，且对外部条件敏感。因此，需要一种基于定量模型（如完全成熟度模型）的精确强度评估技术。许多研究针对基于表观活化能的等效龄期对混凝土强度发展进行了研究。在此过程中，它同时考虑了时间和温度的影响。然而，先前关于含有矿物掺合料的混凝土表观活化能的模型存在局限性，且未考虑温度对强度发展的影响。本文通过若干实验计算了不同GGBFS取代率下的表观活化能，并用于预测GGBFS混凝土的抗压强度。制备了水胶比为0.6、GGBFS取代率为0至60%的混凝土和砂浆试件。考虑三种不同养护温度，通过实验得出表观活化能（）。将不同养护温度下GGBFS混合混凝土的热力学反应性应用于抗压强度模型评估，实验结果与模型吻合良好。结果表明，随着GGBFS取代率的增加，抗压强度出现延迟。
