混燒飛灰搭配再生粒料用於控制性低強度回填材之研究

Abstract

我國能源對於化石燃料的依賴甚深，其中煤炭佔整體能源供應相當大的比例，而燃煤鍋爐系統也已被廣泛運用在工業上，但目前國內燃煤鍋爐廢棄物掩埋場址容量有限，且飽和後場址無法有效再使用，因此實有必要針對燃煤鍋爐所產出的事業廢棄物進行資源再利用的推動，增加工業廢棄物的附加價值與再利用性，以達到環保減碳永續發展之目標，減少自然生態環境上之衝擊。 本實驗嘗試將C公司純燃煤飛灰、C公司25%混燒飛灰、Y公司底碴(YBA)、廢棄混凝土塊，四種再生材料依不同比例搭配並用於控制性低強度回填材(CLSM)中。將再生粒料取代部分天然之粗細粒料；而膠結材部分則是使用水泥分別與台塑F級飛灰、C公司純燃煤飛灰與25%混燒飛灰四種互相組合搭配。本研究試驗共設計22組不同之CLSM配比，其水膠比均為1.02，養護環境分為相對濕度100%與80%兩種，測試各組配比在不同養護環境下是否符合CLSM之施工綱要規範要求並觀察其耐久性。 規劃研究試驗項目有：坍流度試驗、落沉試驗、氯離子含量試驗、各齡期之抗壓強度(7、14、28、56、90天)、各齡期之劈裂抗張強度(7、14、28、56、90天)以及各齡期(1~7、14、28、56、90天)收縮膨脹試驗。藉此觀察各組配比與基準組之差別及各組配比之間互相的差異，並測試各組配比是否符合施工綱要規範對於CLSM之規定。進而透過本研究來觀察再生材料於CLSM上之可行性，以達到回收再利用，永續發展之目標。 關鍵字：控制性低強度回填材、廢棄混凝土塊、再生粒料、養護環境

Our country’s energy depend on fossil fuels deeply, where coal accounts for overall energy supply for a large proportion, and coal-fired boilers are also widely used in industry; however, currently, the capacity of the waste landfill for the coal-fired boilers is limited in Taiwan, and the site can not be effectively reused when it saturated, so it is necessary to advocate the coal-fired boiler industry to practice the recycling use of the by-products not only to increase the value and the recyclability of the industrial waste, but to reach the goal of coal reduction, environmental protection and sustainable development, which can lessen the impact on the natural environment. This experiment explores the Fly Ash by Company C , the 25% Co-Firing Fly Ash by Company C , the Bottom Ash by Company Y and recycled coarse aggregate concrete by using these four recycled materials with different ratio into the Controlled Low-Strength Material (CLSM). Additionally, the experiment shows the process of using the recycled aggregates to partially replace the natural coarse and fine aggregates; as for the binder, cement, the fly ash of class F by Formosa Plastic Group, the fly ash by Company C and the 25% co-firing fly ash by Company C are used with compatible ratio to combine with each other. The tests of the research involve 22 different CLSM ratios. The water and binder ratios are 1.02 and the relative humidity of the curing conditions are 100% and 80%. The results are to test whether each ratio under different curing conditions fits the condition of CLSM’s Construction Specifications of Public Works and also to observe the durability. Tests performed for each proportion are: Slump flow test, Ball Drop test, Method of test for the water soluble chloride ion content of fresh concrete, the compressive strength of each age (7, 14, 28, 56, 90 days), the splitting tensile strength of each age (7, 14, 28, 56, 90 days) and strain test of each age (1 to 7, 14, 28, 56, 90 days). Take these results to observe the difference between each CLSM ratios and reference groups. And test whether each ratio fits the condition of CLSM’s Construction Specifications of Public Works. Furthermore through this research to observe the feasibility of recycled materials on CLSM . In order to achieve recycling objectives of sustainable development. Keywords：CLSM, recycled coarse aggregate concrete, recycled aggregates,curing condition