沙漠砂自密实混凝土-既有混凝土宏微观粘结特性研究
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1.宁夏农垦建设有限公司;2.宁夏银川市西夏区贺兰山西路539号宁夏大学文萃校区土木与水利工程学院;3.宁夏大学 土木与水利工程学院

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TU528

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国家自然科学基金(52168034),宁夏自然科学基金 (2023AAC03039)


Research on the macro-micro bonding characteristics between desert sand self-compacting concrete and existing Concrete
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1.Ningxia Agricultural Reclamation Construction Co,Ltd,Ningxia University;2.College of Civil and Hydraulic Engineering,Ningxia University

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    摘要:

    与既有混凝土粘结是自密实混凝土重要使用场景之一。为了探究沙漠砂自密实混凝土(DSSC)与既有混凝土粘结特性,通过粘结填充、劈裂抗拉强度试验与灌砂法确定粘结破坏模式,分析混凝土类型和界面处理方式对新老混凝土粘结性能影响。利用扫描电子显微镜测定粘结界面微观形貌特征,分析粘结界面间隙宽度分布。研究表明:线型切槽界面与受力方向一致时粘结性能更强;钻孔界面比线型切槽界面效率更高、粘结强度更强、稳定性更好;低水胶比缩小粘结界面间隙,沙漠砂对粘结界面间隙缩减效果在低水胶比下更显著。

    Abstract:

    Bonding with existing concrete is one of the important application situations of self-compacting concrete. With the aim of investigating the bonding characteristics between desert sand self-compacting concrete (DSSC) and other existing concrete, the bond-casting test, bonding interface splitting tensile strength and sand-filling method was used to determinate the failure mode and analyze the influence of concrete type and interface treatment method on the bonding characteristics between old and new concrete. Scanning electron microscope was used to photograph the micro-morphological characteristics of the bonding interface and determinate the distribution of gap width. The result showed that the bonding performance was stronger when the linear grooving was consistent with the load direction. Compared with linear groove cutting, the drilling interface was more efficient in interface efficiency and bonding strength. Low water-to-cement ratio reduced the gap at the bond interface. The effect of desert sand on the reduction of the gap at the bond interface was more significant with low water-to-cement ratio.

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关超,宋锐,韩瑾瑶,等. 沙漠砂自密实混凝土-既有混凝土宏微观粘结特性研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-27
  • 最后修改日期:2024-06-07
  • 录用日期:2024-07-09
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