本研究係針對環境場溫濕度變化下，利用音聲技術（Acoustic Emission ,AE）探求混凝土微裂縫初始發生時機點與內部損傷程度，目的在作為整體影響性評估之用。研究參考ACI與富勒緻密配比法兩種方式進行配比設計，結果顯示水膠比越低，且添加卜作嵐摻料與高粒料用量時，混凝土的抗壓強度、長度變化量、電阻、超音波、氯離子滲透等硬固性質與耐久性皆越佳。利用AE技術偵測混凝土受到環境場影響下之結果顯示，當環境溫度60℃，水膠比越高，發生AE訊號的時機點會越早出現，亦指出塑性裂縫生成機率上升，而高品質的漿體，水膠比越低，可以延緩裂縫生成。環境濕度的越低，發生AE訊號多半會在初凝前，亦即相對濕度的改變將影響混凝土裂縫的型態。經由表面裂縫顯影法之輔助可觀察，混凝土在環境場作用下，裂縫發生型式與平整度會有所差異。本研究顯現AE技術可以有效偵測裂縫產生的時機點，未來可以用來進行即時性的混凝土品質偵測，以提供設計者和相關工程安全性及耐久性之參考，維持混凝土長期性品質和確保其安全性。

The purpose of this study is to apply Acoustic Emission Technique (AE) to explore the occurrence of micro-cracks formation and internal injury during hydration stage of concrete under the temperature and humidity change in the environment field, and to future use for overall structure assessment. The concrete mixtures are designed by ACI and Fuller's densified mixture design algorithm, the results show that the lower the water-to-binder ratio and the addition of pozzolanic material and more aggregate, the better performance the compressive strength, the length change, the electrical resistancy, the ultrasonic pulse velocity, the chloride-ion penetration and other hardened property and durability. The results show that under the temperature 60℃, the higher the water-to-binder ratio the early the occurrence of AE event that refers to the higher possibility of the occurrence of plastic shrinkage. Also, the higher the quality of paste the later the crack formation. Under low relative humidity the occurrence time of AE signal will be before the initial setting time, and it indicates the change in relative humidity will alter the crack formation pattern. By aids of image technology to inspect the surface crack under the environment field, it is useful to view the crack pattern and the surface roughness. This study reveals the AE technology is an effective tool to can detect early crack formation time and in the future can be used for real-time detection of concrete quality to provide designer and structure engineering enough safety and durability information to guarantee the quality and to ensure long-term quality and safety.

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