卜作嵐材料對混凝土微觀特性與耐久性影響之研究

Effect of Fly Ash and Slag on the Microstructure Characteristics and Durability of Concrete

飛灰與爐石分別為火力發電廠燃煤及在煉鐵過程中伴隨產生之工業副產品，為了有效利用原本為廢棄物的飛灰及爐石與提昇混凝土品質，本研究利用不同的混凝土配比包含變化飛灰取代水泥量及變化爐石與飛灰之混合比例，並配合各齡期進行抗壓強度試驗、吸水率試驗、快速氯離子滲透試驗、氯離子浸泡試驗及電阻率試驗等，來探討添加卜作嵐材料對混凝土的微觀特性與耐久性影響。研究結果顯示卜作嵐材料取代水泥之混凝土耐久性優於一般混凝土；而在相同卜作嵐材料取代水泥量下，飛灰與爐石以不同混合比例取代水泥之混凝土優於飛灰取代水泥之混凝土。

The object of this study is to investigate the effect of fly ash and slag on the microstructure characteristics and durability of concrete. Seven groups of concrete specimens with fly ash/slag were cast and tested. In this study, compressive strength test, absorption rate test, rapid chloride penetration test (RCPT), chloride ponding test, and resistivity test were performed. Test results show that the application of pozzolanic materials can reduce the permeability and improve the mechanical properties of concrete. The amount of charge passed and diffusion coefficient of concrete decreases and resistivity increases with an increasing fly ash replacement of cement, and concretes with a combination of fly ash and slag are more beneficial than those only with fly ash for a given water/binder ratio.