中文摘要

本研究利用加速中性化設備使試體快速中性化，並藉由抗壓強度試驗、抗彎強度試驗、抗拉強度試驗、劈裂強度試驗、吸水速率試驗、吸水率試驗、電流滲透量試驗、電阻值量測試驗、超音波量測試驗、汞壓測孔分析試驗及酚試液測定法等試驗結果做分析，探討輸氣混凝土在不同水灰比與養護條件加速中性化後力學性質、物理性質、電學性質及微觀結構的改變。
研究結果顯示，混凝土中性化後發生抗壓強度、抗彎強度、抗拉強度及劈裂強度皆提高，吸水速率及吸水率明顯下降，電滲量降低、電阻值及超音波速增加，平均孔隙直徑變小等現象。分析各項試驗變數，發現混凝土試體在添加輸氣劑、高水灰比及曝露於自然環境中不養護中性化程度最顯著。

Abstract

In this study, accelerated carbonation equipment was used to increase the concrete specimen carbonation. The changes of air-entraining concrete inmechanics, physical character, electrical character, and microstructure were explored after carbonation accelerated under different water-cement ratio and curing conditions.These were determined through the tests of compression strength, bending strength, splitting strength, sorpvitity, water absorption, electric infiltration capacity, resistivity, ultrasonic wave propagation velocity measurement, MIP and phenolphthalein indicator measurement etc..

The results of investigation indicate the concrete compression strength, bending strength, tensile strength and splitting strength were raised. The water absorption in company with sorpvitity were decreased obviously. The resistivity and ultrasonic wave propagation velocity were increased due to electric infiltration capacity debased; and the average pore diameter was reduced relatively. According to the analysis of test variations, it revealed that concrete carbonation degree was apparent when the air-entraining admixture was applied, the specimen was under high water-cement ratio and exposed to ambient condition without curing.

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