実大コンクリート壁における各種の透気性試験に関する共通試験

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タイトル別名
  • ROUND ROBIN TEST ON VARIOUS AIR-PERMEABILITY TESTS OF REAL-SIZE CONCRETE WALL
  • ジツダイ コンクリートヘキ ニ オケル カクシュ ノ トウキショウ シケン ニ カンスル キョウツウ シケン

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 Various air-permeability tests have been studied as a method for evaluating quality of cover concrete using non/ minor destructive methods. In particular, the double-chamber method is often applied to evaluate the quality of cover concrete for civil-engineering structures. Regarding the double-chamber method, although evaluation is currently performed based on the Swiss standard, evaluation criteria which is suitable to Japanese construction site is not well developed.<br> Hence, as a first step towards the final purpose described above, this paper deals with round-robin test study in order to reasonably evaluate the quality of cover concrete by the air permeability test. The round-robin tests were carried out using eight double chamber method(DC(TPT)) machines, two types of single chamber method(SCM) and three types of drill hall method(FIM).<br> From experimental results, authors investigated coefficient of variation of the air permeability indexes due to the difference in the testing machine and the difference in the quality of the cover concrete. In addition, authors investigated the correlation between each test results and the results of RILEM CEMBUREAU method which is benchmark test of air permeability test.<br> The following conclusions were obtained through the round robin test for various air permeability tests.<br> 1. The permeability coefficient K by the RILEM method accurately evaluated the quality of concrete of the actual wall for each nominal strength. The DC (TPT) method and the FIM method were highly correlated with the RILEM method which was a benchmark test, and the FIM method had a very high correlation with the DC (TPT) method.<br> 2. The variation coefficient of the kT in the DC (TPT) machine was 25% due to only the difference of the test machine, and the variation coefficient when averaging the measured values of 6 points on the concrete wall was 65%. As a result, the variation coefficient of the kT due to the difference in the quality of the cover concrete was about 40%, which value was close to the coefficient of variation of the neutralization depth of existing RC structures.<br> 3. The variation coefficient of the P.V. in the FIM method was about 35%, which roughly agreed with the coefficient of variation due to the difference in the quality of the cover concrete by the DC (TPT) method.<br> 4. The average value of the kT measured at 6 points from the same concrete wall by the DC (TPT) method had high correlation with compressive strength. In addition, the FIM method had an extremely high correlation with the compressive strength compared with the SCM method, and the change in the P.V. due to the change in compressive strength were larger than that of the A.P.I..

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