Development of Oil Leakage Stability Evaluation for Composite Aterproofing Methods using Asphalt Mastic and Modified Asphalt Sheet in Concrete Structure

콘크리트 구조물에 사용되는 개량아스팔트 시트와 아스팔트 매스틱을 복합화한 방수공법의 누유안정성 평가방법 개발

Abstract

In this study, a revised oil leakage evaluation method for assessing oil leakage stability of asphalt mastics used in upper slabs of below-grade residential parking lots was developed and presented. In order to verify the reliability and reproducibility of leakage results, the parameters the revised evaluation was carried out for three products with actual leakage history, and it was confirmed the leaks could be reproduced whereas the existing methods could not. To quantitatively verify the reproducibility, the filler content of the leaked samples was derived and the maximum filler content was 64% lower than that of the normal sample. The same results was found with the samples from the actual leakage site, thus verifying the reliability of the revised evaluation method.

본 연구에서는 공동주택 지하주차장 상부슬래브 등 주로 수평부에 적용되는 아스팔트 매스틱 도막재의 누유하자 원인을 바탕으로 제품의 누유안정성 확보 여부를 평가할 수 있는 평가방법을 개발 및 제시하였다. 본 연구에서 제시한 평가방법의 신뢰성을 검증하기 위하여 실제 현장에서 누유 발생 이력이 있는 3개 제품을 대상으로 누유안정성 평가를 진행하였으며, 진행 결과, 실제 발생하는 누유하자의 재연이 가능한 것으로 확인되었다. 재연성에 대한 정량적 검증을 위해 평가 중에 발생한 누유 시료를 채취하여 회분(Filler)함량을 측정한 결과, 정상시료 대비 최대 약 64%가 저하된 것을 확인하였는데, 이는 선행연구에서 규명한 누유원인과 일치하는 결과로 확인하여, 평가방법의 신뢰성이 검증되었다 할 수 있다.

Figure 1. Oil leakage mechanism prediction modeling

Figure 2. Oil leakage status by year

Figure 3. Oil substance leakage through crack

Figure 4. Specimen assembly and evaluation condition

Figure 5. Research flow

Figure 6. Leakage induction area reduced via linear crack use

Figure 7. Below-grade parking lot structure

Figure 8. New specimen base shape determination

Figure 9. New Specimen base sections assembly method

Figure 10. Test storage and evaluation conditions applied

Figure 11. Checking for leakage stability

Figure 12. New leakage stability specimen assembly

Figure 13. Leaked sample collection and filler content evaluation

Figure 14. Leak and normal sample filler content comparison

Table 1. Material segregation test results of sample A, B, C(change in filler content)

Table 2. LH construction issued specification for performance standard of asphalt mastic (before and after revision)

Table 3. Existing oil leakage stability evaluation method

Table 4. Evaluated product specimen properties

Table 5. Evaluation condition

Table 6. Comparison with existing evaluation method

Table 7. New specimen assembly method outline

Table 8. Revised evaluation results after temperature condition

Table 9. Evaluated product specimen properties