| 摘要: | 目前國際間將電弧爐碴運用於水泥基質材料中，並無膨脹量檢測方法及之判斷標準，而業界於再利用電弧爐碴時，需經安定化處理，現常用熱壓試驗檢測爐碴之穩定性。而實驗室在評估電弧爐碴之體積穩定性的方法上，則希望利用低耗能且安全性佳之檢測方法以進行試驗。因此本研究主要探討含電弧爐碴砂漿之檢測方法、電弧爐碴安定化技術及其作為水泥基質材料之粒料使用之工程性質。研究內容以2種電弧爐氧化碴及1種電弧爐還原碴部分取代細天然粒料，分析取代比例及不同環境對含電弧爐碴的水泥砂漿之劣化影響。環境將以室溫、熱壓、80℃浸水、乾溼循環、80℃高鹼及硫酸鹽侵蝕對不同取代比例之砂漿試體進行劣化，並以膨脹量及抗壓強度試驗結果對其安全性進行評估。由膨脹行為及試驗結果發展對含電弧爐碴的水泥砂漿之工程性質預測方法，以能評估電弧爐碴用於水泥基材料時對工程性質之長期影響。
結果顯示，電弧爐碴於室溫環境下一年可以觀察到三個階段之膨脹行為；在80℃浸水環境時，三階段的膨脹行為發展可縮短於28天內完成；對於電弧爐碴安定性處理方法，以熱水浸泡之方式，具有簡單、安全及縮短時間之效果，而經熱水浸泡法處理之電弧爐碴亦有性質佳及穩定性佳之成效。試驗顯示，未安定之電弧爐碴於熱壓、80℃浸水及80℃高鹼環境中均會產生水化膨脹現象，故劣化較嚴重，在硫酸鹽環境時則對電弧爐碴之影響較小。已經安定化處理之電弧爐碴，即使完全取代天然粒料，對於所製成的水泥基質材料之工程性質無明顯影響，且由80℃浸水環境之線性回歸方程式，也能發現可以模擬出不同爐碴取代天然粒料比例時，其對應之84天浸泡齡期內的膨脹量。
;At present, there is no international expansion detection method and the judgment standard of electric arc furnace slag (EAF slag) application in cementitious materials, and the industry in the reuse of EAF slag, need to be stabilized, now commonly used to test the stability of EAF slag hot pressure test. Therefore, this study focuses on the testing method of mortar containing EAF slag, the stabilization technology of EAF slag, and the engineering properties of the use of granules as cementitious materials. Two kinds of EAF oxidation slag and one kind of EAF reduction slag are used to partially replace the natural fine aggregate, and the degradation effects of different environments on the cement mortar containing EAF slag are analyzed in terms of replacement ratio and different environments. The environment will be room temperature, hot pressure, water immersion at 80°C, drying-wetting cycles, high alkali at 80°C and sulfate erosion on the mortar specimens with different substitution ratios for deterioration, and its safety will be evaluated by the results of expansion and compressive strength tests. The swelling behavior and test results were used to develop a method for predicting the engineering properties of cement mortars containing EAF slag in order to evaluate the long-term effects of EAF slag on engineering properties when used as cementitious materials.
The results show that the EAF slag can be observed three stages of expansion behavior in the room temperature environment for one year; in the 80℃ water immersion environment, the three stages of expansion behavior development can be shortened to 28 days to complete; for EAF slag stability treatment method, the hot water immersion method, has simple, safe and save time effect, and by the hot water immersion method of treatment of EAF slag also has good quality and stability of the effectiveness. Test shows that the unstabilized EAF slag in the hot pressure, 80℃ water immersion and 80℃ high alkaline environment will produce hydration expansion phenomenon, lead to more serious deterioration, in the sulfate environment is less impact on the EAF slag. EAF slag has been stabilized and treated, even if it completely replaces the natural fine aggregate, there is no significant effect on the engineering properties of the resulting cementitious materials, and also found that the linear regression equation from the 80°C immersion environment can be found to simulate the expansion of the corresponding 84 days immersion age when the proportion of natural fine aggregate replaced by different EAF slag. |
