低放射性廢棄物盛裝容器混凝土品質檢測之研究

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題名:	低放射性廢棄物盛裝容器混凝土品質檢測之研究
作者:	廖文佑;Liao, Wen-Yu
貢獻者:	土木工程學系
關鍵詞:	氯離子擴散;使用年限;電阻率;鋼纖維分佈;chloride ions;service life;resistivity
日期:	2017-07-10
上傳時間:	2017-10-27 12:12:45 (UTC+8)
出版者:	國立中央大學
摘要:	本研究延續先前研究團隊所進行的氯離子長期浸泡試驗及ASTM C1556試驗，進行低放射性廢棄物盛裝容器混凝土服務年限的推估。長期浸泡試驗已針對試體氯離子濃度剖面蒐集6年數據，發現盛裝容器混凝土擴散係數下降趨勢已極緩，顯示盛裝容器混凝土因所使用的水膠比甚低，而可能已接近水化終止時間，致使其氯離子擴散係數趨於穩定，如採用ACI研發的Life-365程式進行混凝土服務年限的推估，可能因程式所預測25年水化終止其過長而低估氯離子入侵濃度，進而使混凝土服務年限的預估結果過於樂觀不保守，固修正氯離子擴散係數的計算方法並重新推估服務年限，發現水化提前終止混凝土仍能提供足夠的服務年限；而ASTM C1556試驗蒐集了2年數據，因此仍要持續蒐集數據才能更精準得推估其服務年限。為了加速混凝土水化速度，減少早期受損的機會及提升混凝土品質，於本研究使用不同養護溫度60℃(1、2、4天)及80℃(3天、4天、3天+200℃烘箱12小時)，觀察其提升混凝土耐久性及提高品質之效果。透過進行抗壓強度試驗、孔隙率試驗、孔隙結構分佈、乾縮試驗與電阻率試驗，發現以80℃養護3天的成效最佳。所使用最終處置盛裝容器之混凝土配比，因為在配比中加入鋼纖維增強混凝土之抗拉能力，因此對混凝土中鋼纖維分佈以3種剖面方式進行檢定，結果分佈差異性皆不顯著，表示盛裝容器混凝土內的鋼纖維為均勻分佈。為了快速檢測盛裝容器之混凝土品質進行混凝土電阻率的檢測，發現電阻率與孔隙率、抗壓強度、擴散係數有顯著的關係，顯示以電阻率檢測結果來評估混凝土之品質具有可行性。 ;The barriers of facilities which dispose wastes with low radioactivity are mainly composed of concrete. But unlike the normal purpose of concrete, the barrier concrete is expected to be used for more than several hundred years.This study measures long-period experimental data to get better estimated results based on previous studies by using mixes HIC-C and HIC-M, and mixes C and M. Mixes HIC-C and HIC-M were prepared and revised from AASHTO T260 test method in 2010. So far, the experiments have been ongoing and data collected for six years. On the other hand, in 2014, mixes C and M were made according to ASTM C1556 test method. Finally, the study will make comparisons of long-period immersion method and ASTM method based on experimental procedures and test results. Based on above data and results, this study expects to seek for new methods to extend and increase concrete′s durability. In this study, under different curing conditions at high temperatures of 60℃ (1、2、4 days) and 80℃ (3 days、4 days、3 days + 200℃ oven-dry 12 hours), to observe whether the concrete quality and durability will be improved. There are some tests used for this study to evaluate the effects of maintenance methods and maintenance period, including compressive strength test, porosity test, pore size distribution and resistivity test. Fibre distribution characteristics were evaluated to investigate their effect on the quality. For this purpose, an image processing technique developed in this study was employed. From the test results, the aging concrete will get higher hydration degree, and caused the chloride ions hard to penetrate into concrete body. Therefore, under the effectiveness of chloride ions penetrations, ASTM C1556 test method is recommended for concrete service life calcuations.
顯示於類別:	[土木工程研究所] 博碩士論文

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