高性能混凝土之自養護行為

Abstract

良好的養護，必須避免水分由混凝土中過度蒸散，以達到充分的 水化反應，將對於混凝土之耐久性、強度、體積穩定性等各項性能均 有相當程度的提昇，由於自充填混凝土(SCC) 其粉體量高於一般混凝 土，因掺有卜作嵐材料，故更突顯出養護的重要性。 本研究目標為混凝土不僅能減少水分損失且能於大氣中吸收水 分，以提供水化反應之所需之水分，以達自養護效能，試驗中擬採用 三種液態自養護藥劑A、B、C，進行製作自充填混凝土試體，且試 體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。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高性 能混凝土之自養護行為。

A good curing to avoid the evaporation of water to achieve sufficient hydration is very helpful for the durability, strength, volume stability.Self-compacting concrete uses more powders and pozzolans than ordinary concrete, a good curing is even more important.This study is to develop a self-curing concrete not only to reduce the water loss but also can absorb the moisture from the air for curing. Three types of self-curing agents A, B, C were developed and tested. The concrete specimens mixed with self-curing agents were left in air after they were casted. Water loss, compressive strength, and volume stability were studied for the self-cured concrete and very satisfactory results were found. For all the cases, the compressive strengths of self-cured concrete show a higher value than the strengths of ordinary concrete. If the relative humidity is higher than 80%, the compressive strengths of self-cured concrete demonstrate a even higher value than the specimens under standard curing.