EFFECT OF EAF CARBON STEEL SLAG GRAIN SIZE ON THE PROPERTIES OF ASPHALT CONCRETE

In this study, EAF carbon steel slag was divided into four range of grain sizes (25 ~ 12.5 mm, 12.5 ~ 4.75 mm, 4.75 ~ 0.6 mm, and 0.6 ~ 0.075 mm), and the replacement amount of EAF carbon steel slag was fixed at 24%. Asphalt concrete specimens with different grain sizes of EAF carbon steel slag were prepared, and the effects of different grain sizes of EAF carbon steel slag on the engineering properties of asphalt concrete were investigated by resilience modulus, static creep, indirect tensile strength, residual strength of water immersion, Cantabro test, boiling, thermal image analysis, and thermal conductivity tests. The results of the study show that different grain sizes of EAF carbon steel slag have a significant effect on the mechanical properties of asphalt concrete, the best resilience modulus can be achieved by replacing the grain size with 25 ~ 12.5 mm or 12.5 ~ 4.75 mm EAF carbon steel slag. The replacement of 0.6 ~ 0.075 mm and 4.75 ~ 0.6 mm EAF carbon steel slag has better effect on the indirect tensile strength and stripping resistance of asphalt concrete than 25 ~ 12.5 mm and 12.5 ~ 4.75 mm, with 0.6 ~ 0.075 mm being the best. From the thermal image analysis results, it was found that different grain sizes of EAF carbon steel slag had no significant effect on the temperature uniformity of asphalt concrete, but replacing EAF carbon steel slag with grain sizes of 0.6 ~ 0.07 mm significantly improves the thermal diffusivity rate of asphalt concrete.

關鍵字

grain size ； asphalt concrete ； EAF carbon steel slag ； Marshall mix design

並列摘要

本研究將碳鋼氧化碴依粒徑範圍分成四組（25～12.5mm、12.5～4.75mm、4.75～0.6mm及0.6～0.075mm），並將碳鋼氧化碴取代量固定為24%，進行不同粒徑碳鋼氧化碴瀝青混凝土試體製作，藉由回彈模數、潛變、間接張力強度、浸水殘餘強度、肯塔堡飛散、煮沸、熱影像以及熱傳導試驗來探討不同粒徑碳鋼氧化碴對瀝青混凝土工程性質之影響。研究結果顯示，不同粒徑碳鋼氧化碴對瀝青混凝土力學性質有顯著影響，取代粒料粒徑為25～12.5mm或12.5～4.75mm之碳鋼氧化碴於瀝青混凝土可得到最佳回彈模數；取代粒料粒徑為0.6～0.075mm與4.75～0.6mm之碳鋼氧化碴對瀝青混凝土間接張力強度、抗剝脫能力之提升效果優於25～12.5mm與12.5～4.75mm，並以0.6～0.075mm為最佳；從熱影像試驗結果得知，不同粒徑之碳鋼氧化碴對瀝青混凝土之溫度均勻性並無顯著影響，但取代粒徑為0.6～0.075mm之碳鋼氧化碴則明顯提升瀝青混凝土熱擴散率。

並列關鍵字

粒徑；瀝青混凝土；碳鋼氧化碴；馬歇爾配比設計

參考文獻

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