共查询到19条相似文献,搜索用时 109 毫秒
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就控制施工缝的留置位置进行分析,得出按照施工规范与要求留置和处理施工缝,施工缝处的混凝土强度不会低于设计强度要求,施工缝的质量也能得到较好的控制和保证。 相似文献
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对混凝土原材料、配合比、混凝土的生产、浇筑工艺、养护、后期收缩缝的控制等进行了探讨,并结合已有的资料和工作经验,对高标混凝土施工收缩缝产生的原因进行了分析,对裂缝的控制提出一些浅见。 相似文献
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结合昆石高速公路粉喷桩对软土地基进行处理的工程实例,介绍了粉喷桩在设计和施工中易出现的问题、原因及处理措施。 相似文献
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施工缝是钢筋混凝土浇筑工程不可避免的施工危害,作者除提出加强按规范细则进行管理外还提出从四个方面采取措施即可大大的改善施工缝的质量问题。 相似文献
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本文根据《高规》的定性规定,研究高层建筑框架梁柱节点区混凝土如何浇注才能满足承栽力要求的问题,并经定量验算而总结出一种节点区简易的处理方法。 相似文献
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1缺陷因素1 1基层因素常见的基层因素有基层强度不足、污染、脱膜剂、碱度、含水率、渗水、表面不平裂缝和孔穴等因素 ;对需更新饰面涂料的基层有旧涂膜的粉化、涂料剥落后残留旧涂膜的憎水性以及清除旧涂膜用的剥离剂残留在基层上的因素 ;表面太光滑或有油污、尘土、隔离剂未 相似文献
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高等级公路的路基填土一般较高,在软土地基上修筑高填土路堤必然会引起地基的较大沉降,而在遇到桥涵、通道等构造物时将产生较大的不均匀沉降,形成“错台”等病害,因此,就需要采取有效处理方法消除或减少不均匀沉降的发生。本文针对当前高等级公路修建中常采用的几种方法加以评述,并认为多种方法并用的综合处理能得到较满意的效果。 相似文献
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文章着重的论述了高低跨建筑出现沉降差的诸多因素及防治措施,并指出了“后浇带”的特点和可行性。 相似文献
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从理论分析入手,结合室内实验和工程实践,对二灰碎石的强度、收缩性、疲劳变形与混合料配合比、骨料级配等方面的相互关系,提出几点设计中应考虑的问题。 相似文献
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Stress relaxation of water-saturated wood was examined at various temperatures and during the processes of elevation and lowering of temperature. The difference between relaxation at a lower temperature and that at a higher temperature was almost same as the increase in relaxation during temperature elevation. Similar results were obtained regardless of the elevating speed of the temperature and regardless of preheating the samples. On the other hand, relaxation behavior during temperature lowering was quite different from that during temperature elevation. The relaxation moduli during the process of lowering the temperature scarcely changed, although those at various constant temperatures decreased with increases in temperature. Marked sets occurred after relaxation measurements under temperature lowering, whereas only slight sets occurred during the process of elevating the temperature or at a constant temperature of 80°C. Furthermore, it was found that the sets that occurred during the process of temperature reduction were almost recovered when the samples were heated again in water. The mechanism of the relaxation behaviors observed in the present study under nonequilibrium temperature is discussed in relation to the occurrence of set after relaxation measurements.Part of this report was presented at the 48th annual meeting of the Japan Wood Research Society, Shizuoka, April 1998 相似文献
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机制砂混凝土强度与变形试验研究 总被引:1,自引:0,他引:1
通过室内试验,对比分析了河砂和机制砂混凝土强度,机制砂混凝土的强度与河砂混凝土强度基本相同,从而得出机制砂可代替河砂作为混凝土的主骨科的结论.研究了不同石粉含量对机制砂混凝土的强度及变形性能的影响.为了消除机制砂混凝土的不利因素,采用掺加高效减水剂和粉煤灰来提高混凝土的性能,并与天然砂混凝土进行比较.大量试验表明,机制砂混凝土的各种性能优良,完全可以满足施工要求,可用于预拌混凝土的生产. 相似文献
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