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研究了碳化时间、粉煤灰掺量和水胶比对粉煤灰高性能混凝土抗碳化反应能力的影响,运用显微分析方法研究了碳化反应改变水泥浆体及界面过渡区特性的规律。结果表明,用粉煤灰取代高性能混凝土中的水泥导致混凝土早期抗碳化能力下降,而后期抗碳化能力有一定程度的提升;粉煤灰高性能混凝土的抗碳化性能随水胶比的减小而提高;碳化反应可以提高水泥浆体及混凝土界面过渡区的显微硬度和密实程度。当粉煤灰掺量较小时,碳化反应可以减小混凝土界面过渡区的宽度。
The effects of carbonation time, fly ash content and water cement ratio on the carbonation resistance of fly ash high performance concrete were studied. The microscopic analysis was used to study the regularity of carbonation reaction changing the properties of cement paste and interface transition zone. The results show that the replacement of cement in high performance concrete with fly ash results in the decrease of early carbonation resistance of concrete and the increase of carbonization resistance in later stage. The carbonation resistance of fly ash high performance concrete decreases with the decrease of water cement ratio And improve; carbonation reaction can increase the cement slurry and concrete interface transition zone of microhardness and density. When the content of fly ash is small, the carbonization reaction can reduce the width of the transition zone of concrete interface.