【摘要】 煤基固废资源化利用是当前研究热点，以煤基固废制作混凝土是解决煤基固废大量积存的重要方向，并且可以有效缓解混凝土天然原材料的大量消耗。研究使用破碎的连续级配煤矸石替换同体积天然碎石，并采用大量粉煤灰作为胶凝材料制备煤基固废混凝土。优化了实际施工过程中煤基固废混凝土的制作方法，探究了材料在标准养护和自然养护条件下的性能，使用SEM进行了分析。结果表明：随着煤矸石替代量的增加，材料自然养护28 d,强度减小明显，浆体坍落度减小明显；标准养护条件下，煤矸石体积率约为35%时，材料强度损失大幅增加；材料自然养护条件下，强度增长率迅速，0～3 d材料强度增长率最高为6.93 MPa/d,为同龄期标准养护条件下的1.8倍。28 d自然养护强度最高为45.5 MPa,为同龄期标准养护条件下的1.6倍。SEM分析发现，自然养护条件下，28 d水化产物较标准养护明显增多，且发现大量二次水化产物。更多还原

【Abstract】 The resource utilization of coal-based solid waste is a hot topic in current research.Making concrete from coal-based solid waste is not only an important direction to solve the massive accumulation of coal based solid waste, but also can effectively reduce the massive consumption of natural raw material for concrete.In this study, the same volume of natural gravel was replaced by broken continuously graded coal gangue, and a large amount of fly ash was used as cementing material to prepare coal-based solid waste concrete.This paper optimizes the production method of coal-based solid waste concrete in the actual construction process and explores the performance of concrete material under standard curing and natural curing conditions, and analyzes it with SEM.The results showed that the strength and slurry collapse of natural curing for 28d decreased obviously with the increase of coal gangue replacement amount.Under standard curing conditions, the loss of material strength increased greatly when the volume percentage of gangue was about 35%.The growth rate of strength rapidly under natural curing conditions, and the highest growth rate of 0-3d material strength is 6.93 MPa/d, which is 1.8 times of that under standard curing conditions at the same age.The highest natural curing strength for 28 d was 45.5 MPa, which was 1.6 times of that under standard curing conditions at the same age.SEM analysis showed that under natural curing conditions, hydration products of 28 d weresignificantly increased compared with standard curing, and a large number of secondary hydration products were found.更多还原