本土化中強度高性能混凝土(TAICON)高溫蒸氣養護效能研究

Abstract

本研究之目的是採用飛灰取代部份水泥，並添加適量強塑劑，研究在高溫蒸汽養護下之混凝土行為，以找出高溫蒸汽養護之最佳模式，希望藉由試驗結果，產製適合國內工程界使用之本土化中強度高性能混凝土(Taiwan Concrete ,TAICON)。 研究結果顯示：高溫蒸汽養護會造成晚期強度成長緩慢或不成長，尤其是180℃催化時間16小時，其初期強度和91天強度幾乎一樣。高溫蒸汽養護會減少乾縮量及重量變化，並且彈性模數偏低。在溫度方面，養護溫度以180℃強度最好，其次是150℃，而120℃最差，養護時間對強度的影響以催化16小時強度最佳，依次是16hr>8hr>4hr>2hr。 最佳養護模式為養護溫度180℃，預置期8小時，催化時間16小時，其初期強度約為標準養護28天強度之180%左右(約9500psi)，初期強度至91天強度幾乎是維持不變。

The objective of this study is to substitute a portion of cement with fly ash, add appropriate amounts of superplasticizer, and then to study how the resultant concrete reacts under high-temperature steam curing to determine the best high-temperature steam curing model in hopes of using the results of the experiment to produce medium strength, high performance Taiwan concrete (Taicon) suitable for use by the local construction industry. The results of this study show that high-temperature steam curing produces a slowing down of growth or no growth at all in later-age strengths, especially after undergoing 16 hours of catalytic time at temperatures of 180°C. High-temperature steam curing also reduces dry shrinkage and weight change. Early age strength and 91st day strength are virtually the same. High-temperature steam curing has lower Ec than that of standard curing. Curing temperatures of 180°C are best, while 150°C is second best, and 120°C is least ideal. Curing for 16 hours has the best effect-16 hours of catalytic time is superior to 8 hours, which is superior to 4 hours, which is superior to 2. The best curing model is as follows: Curing temperatures of 180°C、8 hours of presetting time and 16 hours of catalytic time. Early-age strength is about 180% of that of the first 28 days of standard curing methods. Early-age strength is virtually identical to 91st day strength.