• Title/Summary/Keyword: 무수축 모르타르 그라우팅

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Development of Non-Shrink Mortar Grouting Type Splice Sleeve (무수축 모르타르 충진형 슬리브 개발)

  • Lee, Young-Ho;Song, Jae-Joon;Cho, Jae-Young;Kim, Do-Hak
    • Journal of the Korean Society of Hazard Mitigation
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    • v.11 no.2
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    • pp.67-73
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    • 2011
  • This study aims to develop an economical precast hollow concrete column with high constructability which consists of only splice sleeve and general reinforcing bar without using PC tendons in order to reduce the construction period and cost. With this purpose, this study performed the finite element analysis and tension test by using some variables such as length of sleeve, diameter of rebar and curing method for suggesting a grouting type splice sleeve which is a new type joint rebar and developing an optimized splice sleeve. As a result, the analysis on the tension performance of splice sleeve did not show any destruction caused by pull-out in reinforcing bar but it only occurred destruction of tension bar or bolt shear rupture from the mechanical defect of sleeve. Therefore, the experiment showed high performance in tension of the suggested splice sleeve and verified the application of precast hollow concrete column.

Development of Precast Hollow Concrete Columns with Non-Shrink Mortar Grouting Type Splice Sleeve (무수축 모르타르 충진형 슬리브를 사용한 중공 프리캐스트 교각 개발)

  • Cho, Jae-Young;Lee, Young-Ho;Kim, Do-Hak;Park, Jong-Heon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.3A
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    • pp.215-225
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    • 2011
  • In general, the precast columns can obtain its homogeneous quality as they are produced in a factory with a hollow concrete block type by using high strength concrete, so that they can generate the reduction of dead load. Such a method of precast hollow concrete columns is already implemented in USA and Japan and used for connecting between blocks which use PC tendons. However, it is inevitable to have uneconomical construction with excessive cost in early stage when PC tendons are used. This study aims to develop an economical precast column with high quality and constructability which consists of only splice sleeve and general reinforcing bar without using PC tendons in order to reduce the construction period and cost. To achieve this goal, this study tested the performance of total 5 minimized models in the experiment with the variables such as hollowness, diameter of main reinforcement bar and cross-sectional size for the cross section of precast column by using grouting type splice sleeve which is a new type joint rebar. And it also verified the performance of column in the experiment for a large-sized model in order to overview its applicability by excluding large scale effect.