Coal gangue, which is the solid waste produced during the coal processing, causes serious environmental problems. Lightweight concrete by making use of the coal-gangue ceramsite as the aggregate has many advantages as the construction material. However, the high brittleness of lightweight aggregate concrete is one of the problems for its application in building infrastructure. In this paper, the variation regularity, influencing factors and reinforcing/toughening method were studied as the reference data for future practical applications of coal-gangue ceramsite lightweight aggregate concrete (CGCLWAC). The results show that the brittleness of CGCLWAC increases with age, but the rate of the increase of brittleness keeps decreasing, and the brittleness is basically stable when the age beyond 28 days. When the sand ratio is above 0.38, the brittleness of CGCLWAC increases with the sand ratio; when the water cement ratio is above 0.32, the brittleness increases with the decrease of the water-cement ratio. Experiments show that when the content of steel fibers is less than 1.5%, the brittleness decreases with the increase of steel fiber content; when the content of steel fibers exceeds a critical value, the toughening effect decreases. From the macro-destructive morphology of the specimens, it is concluded that the incorporation of steel fibers can significantly change the brittleness of CGCLWAC. This study can serve to provide reference data for making use of the solid waste of the coal gangue and optimizing the infrastructure application scheme of CGCLWAC.

煤石是煤炭加工过程中产生的固体废物，会引起严重的环境问题。以煤-石陶粒为骨料的轻质混凝土作为建筑材料具有许多优点。然而，轻质骨料混凝土的高脆性是其在建筑基础设施中的应用的问题之一。本文研究了煤regular石陶粒轻质骨料混凝土（CGCLWAC）的变化规律，影响因素及补强方法，为今后的实际应用提供参考资料。结果表明，CGCLWAC的脆性随年龄的增加而增加，但脆性的增加率持续下降，超过28天时脆性基本稳定。当砂比大于0.38时，CGCLWAC的脆性随砂比的增加而增加。当水灰比大于0.32时，脆性随水灰比的降低而增加。实验表明，钢纤维含量小于1.5％时，脆性随钢纤维含量的增加而降低；当钢纤维的含量超过临界值时，增韧效果降低。从试样的宏观破坏形态可以得出结论，钢纤维的掺入可以显着改变CGCLWAC的脆性。该研究可为利用煤gang石固体废物，优化CGCLWAC基础设施应用方案提供参考数据。脆性随水灰比的降低而增加。实验表明，钢纤维含量小于1.5％时，脆性随钢纤维含量的增加而降低；当钢纤维的含量超过临界值时，增韧效果降低。从试样的宏观破坏形态可以得出结论，钢纤维的掺入可以显着改变CGCLWAC的脆性。该研究可为利用煤gang石固体废物，优化CGCLWAC基础设施应用方案提供参考数据。脆性随水灰比的降低而增加。实验表明，钢纤维含量小于1.5％时，脆性随钢纤维含量的增加而降低；当钢纤维的含量超过临界值时，增韧效果降低。从试样的宏观破坏形态可以得出结论，钢纤维的掺入可以显着改变CGCLWAC的脆性。该研究可为利用煤gang石固体废物，优化CGCLWAC基础设施应用方案提供参考数据。当钢纤维的含量超过临界值时，增韧效果降低。从试样的宏观破坏形态可以得出结论，钢纤维的掺入可以显着改变CGCLWAC的脆性。该研究可为利用煤gang石固体废物，优化CGCLWAC基础设施应用方案提供参考数据。当钢纤维的含量超过临界值时，增韧效果降低。从试样的宏观破坏形态可以得出结论，钢纤维的掺入可以显着改变CGCLWAC的脆性。该研究可为利用煤gang石固体废物，优化CGCLWAC基础设施应用方案提供参考数据。