Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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A Study on the Improvement of Adhesion in Tension and Flexure of Polymer Cement Mortar Depending on Various Test Methods

시험방법에 따른 폴리머 시멘트 모르타르의 인장 및 휨접착강도 개선에 관한 연구

  • Jo, Young-Kug (Department of Architectural Engineering, Chungwoon University)
  • Received : 2018.10.20
  • Accepted : 2018.12.17
  • Published : 2019.02.20
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Abstract

The purpose of this study is to evaluate the improvement effect of adhesion in tension and flexure of polymer cement mortars that have widely used as a repair-reinforcement material in construction field according to adding of polymer dispersions depending on different three types test methods. From the test results, the adhesion performance is improved with a raise in polymer-cement ratio irrespective of the type of polymer. The maximums of A type adhesion in tension, B type adhesion in tension and adhesion in flexure show 1.90 times, 2.17 times and 1.83 times, respectively that of plain cement mortar. The relative strength ratios, B type adhesion in tension and adhesion in flexure of polymer cement mortars to tensile and flexural strengths of plain mortar respectively are in ranges of 50.1% to 101.7% and 73.8% to 132.9% compared to 46.9% of plain mortar. It is apparent that polymer cement mortars with EVA and polymer cement ratios of 10% to 15% are recommended considering its adhesion performance and cost as a repair-reinforcement material in construction field.

폴리머 종류에 상관없이 폴리머 시멘트비의 증가에 따라 접착성능은 크게 개선되었으며, A타입 인장접착강도는 1.90배, B 타입 인장(접착)강도는 2.17배, 휨(접착)강도는 1.83배 보통 시멘트 모르타르 보다 높게 나타났으며, 보통 시멘트 모르타르의 B 타입 인장(접착)강도에 대한 인장강도비와 휨(접착)강도에 대한 휨강도비인 상대강도비가 각각 46.9%, 72.6%를 나타냈으며, 폴리머 시멘트 모르타르의 경우에는 각각 50.1%~101.7%, 73.8%~132.9% 범위를 나타내, 폴리머 시멘트 모르타르가 높은 강도회복율을 보였다. 폴리머 종류에 따라서는 EVA를 사용하고, 폴리머 시멘트비로서는 접착성능과 경제성을 고려하면, P/C 10%~15% 범위를 제안할 수 있다.

Keywords

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Figure 1. Specimen for adhesion in tension and flexure

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Figure 2. Water-cement ratio of PCM for target flow of170±5mm

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Figure 3. Air-content of PCM with and without antifoamer

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Figure 4. A-type adhesion in tension of PCM according to polymer-cement ratio

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Figure 5. A-type adhesion in tension of PCM according to type of polymer

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Figure 6. A-type relative adhesion in tension ratio of PCM to plain mortar

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Figure 7. Tensile strength of PCM according to polymer-cement ratio

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Figure 8. B-type adhesion in tension of PCM according to polymer-cement ratio

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Figure 9. B-type adhesion in tension of PCM according to type of polymer

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Figure 10. B-type relative adhesion in tension ratio of PCM to plain mortar

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Figure 11. B-type relative adhesion in tension ratio to tensile strength of PCM

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Figure 12. Flexural strength of PCM according to polymer-cement ratio

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Figure 13. Adhesion in flexure of PCM according to polymer-cement ratio

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Figure 14. Adhesion in flexure of PCM according to type of polymer

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Figure 15. Relative adhesion in flexure ratio of PCM to plain mortar

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Figure 16. Relative adhesion in flexure ratio to flexural strength of PCM

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Figure 17. Distribution of adhesion in tension and flexure of PCM

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Figure 18. Micro-structures of PCM(x, 300 or 1,000)

Table 1. Various factors for experiment

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Table 2. Properties of polymer dispersions

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Table 3. Mix proportions of PCM

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