再生陶瓷混凝土抗压强度及弹性模量试验研究
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华东交通大学轨道交通基础设施性能监测与保障国家重点实验室

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国家自然科学基金项目(51868020);江西省研究生创新资金项目(YC2021-B142);江西省自然科学基金重点项目(20192ACBL21002);江西省教育厅科学技术研究重点项目(GJJ210649)


Experimental study on compressive strength and elastic modulus of recycled ceramic concrete
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    摘要:

    为研究不同再生陶瓷骨料类型和取代率对混凝土抗压强度和弹性模量的影响,利用再生陶瓷细骨料以0%、10%、20%、30%、40%、50%、60%、70%、80%、90%和100%取代率等质量替换天然河砂制作再生陶瓷细骨料混凝土(CRFC)。在再生陶瓷细骨料全取代(100%)天然细骨料的基础上,采用再生陶瓷粗骨料以0%、10%、20%、30%、40%、50%、60%、70%、80%、90%和100%取代率等质量替换天然碎石制作再生陶瓷粗细骨料混凝土(CRC),研究CRFC和CRC的物理性能和力学性能,分析废弃墙地砖陶瓷作为混凝土再生骨料的可行性。研究表明:1)本文采用的再生陶瓷粗、细骨料可以达到《普通混凝土用砂、石质量及检验方法标准》(JGJ 52-2006)要求;2)再生陶瓷混凝土较普通混凝土质量更轻,加入附加水后可以达到普通混凝土的和易性要求;3)再生陶瓷粗骨料与再生陶瓷细骨料相比,前者对混凝土的抗压强度和弹性模量的降低有显著影响;4)CRFC的断裂破坏发生在天然粗骨料和水泥砂浆界面过渡区,而CRC主要发生在再生陶瓷粗骨料内部;5)对于取代率大于50%的CRC,再生陶瓷粗骨料本身的压碎指标是再生陶瓷混凝土抗压强度的决定性因素。

    Abstract:

    In order to study the effect of recycled ceramic aggregate different types and replacement rates on the compressive strength and elastic modulus of concrete, recycled ceramic fine aggregate was used to replace natural river sand with the quality of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% replacement rate to produce recycled ceramic fine aggregate concrete (CRFC). On the basis of completely replacing (100%) natural fine aggregate with recycled ceramic fine aggregate, recycled ceramic coarse aggregate is used to replace natural gravel with quality of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% replacement rate to produce recycled ceramic coarse and fine aggregate concrete (CRC). The physical and mechanical properties of CRFC and CRC were studied, and the feasibility of waste tile ceramics as recycled concrete aggregate was analyzed. The results show that: 1) Recycled ceramic coarse and fine aggregate adopted in this paper are in line with the designed standards; 2) Recycled ceramic concrete is lighter than ordinary concrete, and its workability reaches ordinary concrete after adding additional water; 3) Recycled ceramic coarse aggregate has a significant effect on the reduction of compressive strength and elastic modulus of concrete compared with recycled ceramic fine aggregate; 4) The fracture failure of CRFC occurred in transition zone between natural coarse aggregate and cement mortar, while CRC mainly occurred in the interior of recycled ceramic coarse aggregate. 5) When replacement rate of CRC is greater than 50%, the crushing index of recycled ceramic coarse aggregate is the decisive factor for compressive strength.

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  • 收稿日期:2023-03-09
  • 最后修改日期:2023-04-13
  • 录用日期:2023-04-14
  • 在线发布日期: 2023-06-21
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