蒸氣養護與微波加熱技術於新拌混凝土之研究

A Study on Applying Steam Curing and Microwave Heating Technology for Fresh Concrete

李明君(Ming-Gin Lee) ； 徐尉凱(Wei-Kai Hsu) ； 陳郁婷(Yu-Ting Chen) ； 蘇育民(Yu-Min Su) ； 李子榮(Jeremiah Lee)

《中國土木水利工程學刊》 26卷3期 (2014/09) Pp. 243-247

https://doi.org/10.6652/JoCICHE.201409_26(3).0009

摘要

本研究係由一般、爐石、飛灰或矽灰之水泥砂漿與混凝土來探討加速養生及其試驗法。加速養生的方式是試體經由遠紅外線蒸氣養護後，再藉由微波加熱技術，能夠迅速加熱且均勻之優點，於不同水化階段快速養生試體。依照不同養生時間對試體進行各項抗壓強度、吸附水能力、超音波試驗與氯離子電滲量試驗；其中，氯離子電滲量試驗為混凝土耐久性的指標之一。本研究之初步結果發現：無論是一般或添加礦物摻料之試樣，藉由加速養生法可在24小時之試驗程序內，高效率地提升強度，使其達到控制組水中7天養護強度，部分試樣甚至達到28天強度；混凝土的水化程度亦提高甚多，部分試體甚至超過室內無養護28天之水化程度。部分混凝土試體經過加速養護後，再放入水中28天，其電滲量值大幅下降且較控制組為低。此外，亦發現添加爐石能夠增加微觀結構的緻密性，有助於降低電滲量。

關鍵字

蒸氣養護 ； 微波加熱 ； 強度

並列摘要

In this study, cement sand paste and common concrete with or without slag, fly ash and silica fume were used to investigate some accelerated curing on the strength and permeability of concrete. In order to evaluate some rapid curing procedure that could run a series of tests within one day to attain an estimate of the 28-day strength of the concrete. Specimens with steam curing and microwave heat curing in different hydration stages were tested on compressive strength and chloride electrical permeability. The steam curing and microwave heating techniques provide the advantage of quick and uniform heating for curing. The results were found that the accelerated curing on fresh mortar samples which combines steam curing and microwave heat curing could increase strength successfully within short time. Some accelerated curing samples can reach 7-day compressive strength and the others can reach 28-day compressive strength. It was found that the 28-day chloride electrical permeability of the accelerated curing samples reduce greatly when curing them in water after the accelerated curing. The samples with slag make a contribution to the denseness of microstructure and reduce the chloride electrical permeability.

並列關鍵字

steam curing ； microwave heating ； strength