經高溫燒結之含矽質再生材料，如廢磁磚、廢衞浴設備、廢玻璃、燒結之輕質粒料、和各種爐渣等，若作為水泥混凝土的粒料，可能造成混凝土產生膨脹現象，其原因可分為兩部份：(1) 高溫燒結後降溫過快，致使材料中產生結晶不完全的矽–氧結構，成為反應活性粒料，在混凝土中發生鹼質與粒料反應造成膨脹。(2) 材料中含有硬燒的氧化鈣或氧化鎂，遇水緩慢的轉變成氫氧化鈣或氫氧化鎂造成體積膨脹。本計畫擬分為兩大部份：第一部份擬先利用 ASTM C289、C1260、C227 等方法篩選出具反應活性的矽質再生材料後，探討其在混凝土中因其含量、粒徑變化造成pessimum 現象的膨脹行為，再進一步利用低鹼水泥、使用飛灰或水淬爐石粉等方法，研究其抑制反應膨脹的成效。第二部份則以各種爐碴為主，先將爐碴破碎至不同粒徑後，分別在有水的環境下進行安定化處理後，適時製作水泥砂漿棒試體，再分別經150℃高壓蒸鍋、100℃蒸櫃、和水煮的方式，檢驗爐碴的安定化成效，期望建立爐碴粒徑、溫度和時間對安定化成效的影響關係。期望本計畫的研究成果，在將來使用高溫燒結含矽質再生粒料時，採用適當的抑制鹼質與粒料反應膨脹的方法和注意事項，或選擇合理的加速安定化和檢驗方法，以避免在使用再生粒料後造成混凝土發生膨脹現象，造成節能減碳不成反浪費的窘事。This two-year project plans to study the expansive behavior of recycled materials contained sintered silica, such as waste glass, waste tile, sintered light aggregate, and slag, used as the aggregate in concrete. The expansion of this kind recycled material may result from the alkali-aggregate reaction due to the amorphous silica contained in the material act as reactive aggregate, or from the slow hydration of hard burned calcium oxide or magnesium oxide. In the first year, this research plans to investigate the reactivity of the recycled materials according to ASTM C289, C227 and C1260, exam the pessimum effect of content and particle size of the identified reactive materials, and study the strategy for preventing expansion. In the second year, the slow hydration of CaO and MgO contained in the slag will try to be accelerated by breaking to the range of sand and cured in the moist environment. A mortar bar expansion test will be developed to identify the stability of slag on expansion. The expansive behavior of mortar bar samples will test in the conditions of 150℃ autoclave chamber, 100℃ steamed case and boiling water. The relationship among the slag particle size, temperature and curing time will be established in the process of slag stabilization. 研究期間：10008 ~ 10107
