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Fracture behavior of masonry bond.

机译：砌体粘结的断裂行为。

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摘要

In this study, three different mechanical tests and video microscopy experiments were preformed to characterize the fracture behavior of masonry bond.; Mortars were fabricated under two different conditions: Mortars cast in plexiglass molds and; Mortars exposed to the interactions with dry masonry units. The mechanical properties of the mortar were significantly modified when the mortars experienced mortar/unit interactions. Also, different surface textures for the masonry units altered the strength of embedded mortar when identical mortars were used. It is strongly recommended that the in-situ mortar strength should be used rather than the cast mortar strength because dependence upon laboratory test results for determination of structural performance invites significant error.; For masonry bond fracture, a test method was developed and used successfully to measure load-CMOD behavior until complete failure maintaining stable crack growth. It was found that the strength of in-situ mortar was an important indication of bond strength. Admixtures that had similar purposes for the bulk materials were dramatically different in bond strength. The bond strength was also significantly altered with different surface textures for the masonry.; A new technique was performed to investigate the details of the fracture surface using video microscopy. Degree of bond was defined as an area fraction of the net bonded area. The bond strength was a strictly linear function of the degree of bond and when the bond strength was normalized with degree of bond.; The applied fracture mechanics model, when both elastic and inelastic deformations were considered, always over-estimated the post-peak behavior. However, the post-peak behavior was successfully predicted when the model was modified to consider only elastic deformation. The analysis indicated that little toughening action took place during the fracture process and the fracture process zone at the crack tip was small relative to plain concrete and mortar. This was due to the highly brittle fracture nature associated with pre-determined weak crack path and relatively smooth crack surfaces. Using the relationship between degree of bond and bond strength, and the established fracture model, it was possible to describe the fracture behavior for an ideal perfect bond. As the degree of bond approaches 100%, bond strength increases but the work of fracture does not improve as a simple function of increase in the degree of bond.
机译：在这项研究中，进行了三种不同的力学测试和视频显微镜实验以表征砌体粘结的断裂行为。砂浆是在两种不同条件下制造的：将砂浆浇铸在有机玻璃模具中；以及砂浆暴露于与干燥砌体单元的相互作用。当砂浆经历砂浆/单元相互作用时，砂浆的机械性能会显着改变。同样，当使用相同的砂浆时，砌体单元的不同表面纹理会改变嵌入式砂浆的强度。强烈建议使用现场砂浆强度而不是浇铸砂浆强度，因为依赖于实验室测试结果来确定结构性能会产生很大的误差。对于砌体粘结断裂，开发了一种测试方法，并成功地用于测量载荷CMOD行为，直到完全破坏并保持稳定的裂纹扩展。发现原位砂浆的强度是粘结强度的重要指标。具有类似目的的块状混合物的粘结强度差异很大。随着砖石表面纹理的变化，粘结强度也发生了显着变化。使用视频显微镜进行了一项新技术来研究骨折表面的细节。结合度定义为净结合面积的面积分数。粘结强度是粘结度的严格线性函数，当粘结强度用粘结度归一化时。当同时考虑弹性变形和非弹性变形时，所应用的断裂力学模型总是高估了峰后行为。但是，当修改模型以仅考虑弹性变形时，可以成功预测峰后行为。分析表明，在断裂过程中几乎没有发生增韧作用，并且裂纹尖端的断裂过程区域相对于普通混凝土和砂浆而言较小。这是由于与预定的弱裂纹路径和相对光滑的裂纹表面相关的高度脆性断裂性质。利用粘结程度和粘结强度之间的关系，以及建立的断裂模型，可以描述理想完美粘结的断裂行为。当粘合程度接近100％时，粘合强度会增加，但断裂功不会因为粘合程度的增加而得到改善。

著录项

  • 作者

    Park, Cheolwoo.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Civil.; Engineering Mechanical.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;机械、仪表工业;工程材料学;
  • 关键词

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