A Study on Basic Properties of Grouting Motars for polymer-Modified preplaced Aggregate Concrete

프리팩트 폴리머 시멘트 콘크리트용 주입 폴리머 시멘트 모르터의 성질에 관한 연구

  • 이철웅 (전북대학교 산업기술대학원 건축공학과) ;
  • 김완기 (전북대학교 건축공학과) ;
  • 조영국 (충남산업대학교 건축공학과) ;
  • 소양섭 (전북대학교 건축공학과)
  • Published : 1998.10.01

Abstract

Preplaced aggregate concrete in the building fields has recently been used in the partial repair works for damaged reinforced concrete structures, and polymer-modified mortars have been employed as grouting mortars for the preplaced aggregate concrete. The objective of this study is to clear the properties of polymer-modified grouting mortars. Polymer-modified mortars using a polystyrene acrylic(St/Ac) emulsion as grouting mortars for preplaced aggregate concrete are prepared with various mix proportions, and tested for flexural and compressive strengths, adhesion in tension. The flexural strength of emulsion-modified grouting mortars does not give much variation with increasing fly ash replacement for cement and sand-binder ratio. With increasing polymer-binder ratio, the flexural strength and adhesion in tension of St/Ac emulsion-modified grouting mortars increases, become nearly constant or reaches a maximum at a polymer-binder ratio of 5%. From the test results, St/Ac emulsion-modified grouting mortar with a polymer-binder ratio of 5%, a fly ash replacement of 10% for cement and sand-binder ratio of 1.0 is recommended as a grouting mortar for preplaced aggregate concrete.

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