轉爐石作為基底層材料及其工程特性之研究

• Main Authors: 王金鐘, Wang, Chin-Chung
• Other Authors: 土木工程學系碩博士班, 李德河, Lee, Der-Her
• Format: Thesis
• Language: Chinese; English
• Published: 2005
• Subjects: Substitution Wet-binder Method; Ageing; Wet-binder Method; Alkalinity; Activity; Alkali-Carbonate Reaction; Basic Oxygen Furnance Slag (BOF); Swell; 濕裹法; 轉爐石; 取代濕裹並用法; 熟化; 回脹率; 鹼-碳酸鹽反應; 活性; 鹽基度; The ''Y''; Carbonic acid
• Online Access: http://ir.lib.ncku.edu.tw/handle/987654321/16976; http://ir.lib.ncku.edu.tw/bitstream/987654321/16976/1/

轉爐石為煉鋼過程中產生的副產品，其可作為土木材料使用，惟因本身具有回脹性，致使其用途受到限制，為改善此缺點，本研究第一部分建立轉爐石物性、化性及基本力學性質等材料特性及其影響因子，第二部分轉爐石穩定方法探討—濕裹、取代及濕裹並用法，建立波索蘭材料添加量與回脹、重金屬鉻溶出量關係，第三部分現地試舖參數量測與化性檢測。 由研究結果顯示，(1)由熱重分析(TGA)得知熟化前後轉爐石中氫氧化鈣明顯下降，碳酸鈣則不斷上升，證明轉爐石是在強鹼環境下一直發生鹼-碳酸鹽反應。(2)從養治方法上考量，採用JIS A5015法及Koide法養治溫度高(80±3℃)、細料多、自由回脹可產生合理的回脹量，採用ASTM D4792法養治溫度低(70±3℃)、細料較少、限制回脹，測得回脹率較低，CBR值則較高；經濟評估，濕裹法成本較低。 轉爐石穩定方法中濕裹法及取代濕裹並用法都是波索蘭材料添加法，兩者均具有抑制回脹效果，其回脹率均遠低於1 5%的要求，就CBR值而言濕裹法大於取代濕裹並用法。由波索蘭材料添加量與回脹率及重金屬溶出量回歸出關係式，其回脹率關係式為Y=5 35X-0 507 ；其重金屬溶出量關係式為Y=729 81X-0 494 式中 Y分別為回脹率及重金屬鉻溶出量，X為波索蘭材料添加量，只要添加18%以上的波索蘭材料達即可符合規範工程品質及環境品質要求，此回歸式為本研究最大貢獻。 就現場試舖而言，兩法滾壓次數達10次～14次即可達到100%以上壓實度；回脹率介於0 01%～0 06%之間；其地下水質方面酸鹼值介於6 8~7 25之間；就重金屬鎘、鉻、銅、鋅、鎳、鉛、汞、砷的濃度，遠低於第二類地下水監測基準及管制標準，因此不會對地下水質造成負面影響。 Basic Oxygen Furnace Slag (BOF) is a residual product of steel-making process which can be used as civil engineering material but because its swelling problem so it has a lot of limitation for being used To overcome this weakness in the first part this research establishes the physical and chemical properties of BOF its basic mechanical properties and also the other factors which are concerned etc The second part is to confer the BOF stabilization methods i e wet-binder method and substitution wet-binder method to establish the relationship of the amount of Pozzolan material added with the swelling amount and the heavy metal leaching amount of Cr The third part is measuring the parameters and examining the chemical properties on the test site The results of this research show that: (1) By Thermal Gravity Analysis (TGA) we find that the Ca(OH)2 amount in BOF before and after ageing decreases obviously and the CaCO3 amount increases continuously which proves that BOF under strong alkali conditions will has alkali-carbonic acid reactions continuously (2) Considering the raising periods when using JIS A5015 and Koide’s Method the raising temperature is high (80±3℃) it has a lot of fine grains and the free swelling amount is reasonable When using ASTM D4792 method the raising temperature is low (70±3℃) it has fewer fine grains and can restricts swelling which produces lower swelling amount and higher CBR value Considering economical way the wet-binder method needs lower cost The BOF stabilization method like wet-binder and substitution wet-binder method are methods of adding Pozzolan material which both of them can restrict swelling and the results are far below the 1 5% demand In CBR value the wet-binder method gives higher result than substitution wet-binder method From the regression of the relationship of the amount of Pozzolan material added with the swelling amount and the heavy metal leaching amount we have the swelling ratio formula as Y=5 35X-0 507; and the heavy metal leaching amount formula as Y=729 81X-0 494 The Y in the formula represents the swelling ratio and the heavy metal leaching amount when the X represents the amount of Pozzolan material added While the amount of Pozzolan material added surpasses 18% it can fit with the engineering quality standard and also the demand of environment quality This regression formula is the most important contribution of this research In the test site both method needs 10 to 14 cycle of rolling to reach more than 100% field compaction degree; swelling ratio is between 0 01% and 0 06%; the pH value of groundwater resources is between 6 8 and 7 25; the concentration of heavy metal Cd Cr Cu Zn Ni Pb Hg and As all far below the second category groundwater monitoring standard and the control criterion so it will not gives negative effects to groundwater quality