人工粒料作為路基材料及CLSM對RC構件和金屬腐蝕之影響研究

artificial aggregates used as foundation materials and as aggregates in CLSM cause corrosion of metal materials and reinforced concrete.

呂劭君(Shao-gin Lu)

指導教授 ： 李釗

國立中央大學/工學院/土木工程學系/碩士(2011年)

摘要

本研究探討人工粒料作為路基材料，及作為CLSM粒料時，對金屬材料及混凝土內鋼筋腐蝕的影響，研究內容分為歐盟管柱溶出試驗、鹽水浸漬試驗、NIST程式分析混凝土擴散係數及現地模擬實作。
研究成果顯示：(1)針對人工粒料進行歐盟管柱溶出試驗，分析6種重金屬溶出量，皆低於荷蘭標準及國內環保署土壤重金屬污染標準。(2) NIST程式分析與90天鹽水浸漬試驗對混凝土210及280 kgf/cm2 配比結果比較，顯示NIST程式對於210配比擴散係數的預測較為接近，而對於280配比則有低估的情形。(3)人工粒料級配內之各種防蝕處理碳鋼棒，經埋置五個月後，以熱浸鍍鋅及環氧鋅漆碳鋼棒之重量損失，小於天然級配內相同處理之碳鋼棒，其重量損失肇因於防蝕處理之重量差，為實驗誤差。(4)埋於現地不同路基材料及CLSM溝渠內模擬RC構件，經五個月後並無氯離子滲入混凝土內部且無失去鹼性保護環境，鑿取後之鋼筋與製作RC試體前之鋼筋，其降伏強度、抗拉強度及鋼筋伸長率無太大落差，且皆符合CNS 560規範要求。

關鍵字

重金屬溶出 ； 鹽水浸漬試驗 ； 腐蝕

並列摘要

In this study, artificial aggregates used as foundation materials, and as aggregates in CLSM, cause corrosion of metal materials and reinforced concrete. The study includes the EU column leaching test, ponding test, calculating the diffusion coefficient of concrete with the NIST program, simulation practice in situ.
The results: (1) Artificial aggregates for column leaching test, analysis of six leaching of heavy metals, are lower than the Dutch standard and heavy metal pollution of EPA standards. (2) The results of concrete design mixture 210 and 280 kgf/cm2 with NIST program and 90 days of ponding test, NIST program shows the prediction for the diffusion coefficient of 210 kgf/cm2 design mixture is close, but for the 280 kgf/cm2 design mixture is underestimated. (3) A variety of corrosion prevention of carbon steel in artificial aggregate gradation, after five months the weight loss of the hot-dip galvanized and epoxy zinc painted carbon steels, less than the same treatment in the natural gradation, because the weight difference dealing with corrosion, resulting in weight loss for the experimental error. (4) RC components in the different foundation materials and CLSM after five months, no chloride ions penetrate the internal and not lose the basic protection of the environment, the reinforced after cutting and before making RC components, their yield strength, tensile strength and elongation were similar, and they all consistent with CNS 560.

並列關鍵字

ponding test ； leaching of heavy metals ； corrosion.

參考文獻

7. J. N. Enevoldsen, C. M. Hansson, and B.B. Hope, “Binding of chloride in mortar containing admixed or penetrated chlorides,”Cement and Concrete Research, Vol. 24, Issue 8, pp. 1525-1533, 1994.

8. C. Arya, N. R. Buenfeld, and J. B. Newman, “Factors Influencing Chloride-Binding in Concrete,”Cement and Concrete Research, Vol. 20, Issue 2, pp. 291-300, 1990.

9. X. Wu, L. Xu, Q. Yang, and S. Huang, “The diffusion equation of chloride ions in cement mortar,”Trans Shanghai Building Materials Collection, vol. 4, pp. 364-372, 1991.

10. B. F. Johannesson, “Diffusion of a mixture of cations and anions dissolved in water,”Cement and Concrete Research, Vol. 29, Issue 8, pp. 1261-1270, 1999.

12. R. Kumar, and B. Bhattacharjee, “Porosity, pore size distribution and in situ strength of concrete,”Cement and Concrete Research, Vol. 33, Issue 1, pp. 155-164, 2003.