高性能自養護混凝土

Abstract

良好的養護，對於混凝土的耐久性、強度、水密性、體積穩定性等各項性能均有相當程度的幫助。混凝土工程中，養護工作被認為是相當重要的一環，充分的水化反應將減少混凝土內部的孔隙及裂縫而使強度有效提升。由於自充填混凝土(SCC)以卜作嵐材料取代部分粉體量，而卜作嵐材料其特性為水化反應時間較水泥晚，故更突顯出養護的重要性。 本研究係探討自養護材料對於SCC於不同環境及條件下之養護效果及影響，試驗中擬採用四種自養護材料A、B、C、D使得混凝土在澆置後不需額外的水分或任何外部的養護便能達到理想的養護。自養護材料A為兩種具有保水效果及吸收空氣中水氣特性的材料，以1:1方式混合而成；而材料B、C則為三種具有保水效果及吸收空氣中水氣特性的材料，以1:1:1方式混合而成，以上A、B、C三種材料皆為液態，而材料D則為粉體狀之吸水材料。試驗中藉由量測水分重量損失、試體強度與體積收縮來探討自充填自養護混凝土的行為。

Good cure, have is the key to concrete performance, such as durability, strength, water-tightness, volume stability, etc. High hydrateion of Portland cement will reduce voids pores and crack of inner concrete and make the strength higher. The mineral admixtures for SCC(Pozzolanic materials) hydrate in later stage. If there is not enough water, then pozzolanic reaction will not be activated, and the characteristics will not be improved. This study investigates the effectiveness of the self-curing material. There are four self-curing materials, namely A, B, C, and D. There is no need to cure the concrete after pouring. The material A, B, C and D can absorb water from the air and then release to concrete. The material A, B, C are in liquid state, and material D is powder. The water loss, volume change, and mechanical properties were studied.