焚化飛灰混凝土應用在工程上可行性之研究

Abstract

本研究係將焚化飛灰，取代細骨材添加於混凝土之中，以探討各種養護條件下之物性。由試驗結果顯示，加入焚化飛灰會促進混凝土早凝、早強並提高強度。其最佳添加量為水泥重量之15% ~25%。將MTCLP溶出試驗重金屬溶出濃度，加起來合計之總濃度，仍低於現行規範TCLP溶出試驗之限定值，而且，抗壓強度也遠超過規範之要求，所以，焚化飛灰之再利用可行的。

The study is to evaluate the physical properties of concrete under different curing conditions when some of the sands in the concrete are replaced by incinerator fly ash. The result indicated that when the incinerator fly ash was added to concrete, it would make concrete set earlier, increase early strength, and increase strength. The optimal amount of additive is between 15 % ~ 25 % of the weight of cement. The MTCLP was used in evaluation of leaching of heavy metals. According to 10 independently performed MTCLP, the total amounts of heavy metal bleached were below the regulatory thresholds measured by TCLP. As for the compressive strength of all the concretes exceeded the regulatory thresholds requirement. Accordingly, incinerator fly ash reused is feasible.