Adopting crushed coal gangue as aggregates for new concrete production could be a sustainable alternative to natural aggregates and could reduce landfill space. For the structural applications of innovative concrete, the elastic modulus is a key parameter influencing its serviceability limit state. Prediction models are presented herein for the elastic modulus of concrete prepared with coarse coal gangue aggregates (CGAs), including spontaneous-combustion coal gangue aggregate (SCGAs) and rock coal gangue aggregate (RCGAs). Experimental data from our previous studies and other literature were first collected to quantify the effects of the replacement ratio of CGAs, as well as the density and compressive strength of CGA concrete on the elastic modulus of the resulting concrete. Based on our previous experimental data, empirical models were proposed and validated against 150 groups of tested data. The obtained results indicated that the replacement ratio of CGAs is the major factor, and there were up to 57% and 41% reductions in the elastic modulus of the resulting concrete prepared with 100% SCGAs and RCGAs, respectively; by considering the replacement ratio, compressive strength and density of concrete, the newly proposed models in this study estimated the elastic modulus of both SCGA and RCGA concrete accurately.

采用压碎的煤石作为新混凝土生产的骨料可以替代天然骨料，并且可以减少填埋场的面积。对于创新混凝土的结构应用，弹性模量是影响其使用寿命极限状态的关键参数。本文介绍了用粗煤石骨料（CGA）（包括自燃煤石骨料（SCGA）和岩煤coal石骨料（RCGA））制备的混凝土的弹性模量的预测模型。首先收集来自我们先前研究和其他文献的实验数据，以量化CGA的置换率以及CGA混凝土的密度和抗压强度对所得混凝土弹性模量的影响。根据我们之前的实验数据，提出了经验模型，并针对150组测试数据进行了验证。所得结果表明，CGA的置换率是主要因素，用100％SCGA和RCGA制备的混凝土的弹性模量分别降低了57％和41％。通过考虑混凝土的置换率，抗压强度和密度，本研究中新提出的模型可以准确地估计SCGA和RCGA混凝土的弹性模量。