自充填自養護混凝土

Abstract

自充填混凝土(SCC)為未來營建材料主流之ㄧ，自1991年起，世界先進國家及台灣本島相繼都有研發及應用實例，且莫不積極發展。由於SCC其粉體量高於一般混凝土，且掺有爐石粉、飛灰及強塑劑等，養護至為重要。養護對混凝土之耐久性、強度、水密性、體積穩定性等皆有很大的影響，關係著水化反應是否完全。

本研究係探討自養護材料對於SCC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之養護。自養護材料A、B、C為兩種具有涵養水分及吸收空氣中水氣特性的材料，以1:1方式混合而成；材料D則為強力的吸水材料。四種材料皆於混凝土拌合時添加。藉由量測水分重量損失、體積收縮及力學性質等來探討自充填混凝土之自養護行為。

Self-compacting concrete had been studied since 1991 by many countries, such as Japan and Europe. Taiwan started the development and application since year 2000 and is gaining the momentum rapidly. Due to the high powder content, the curing is very important for the development of the mechanical properties of the concrete, such as durability, strength, water-tightness, volume stability, etc.

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, and C can absorb water from the air and release to concrete.The material D is a highly water absorbing material.These four materials were added into concrete during mixing.The water loss, volume change, and mechanical properties were studied.