|Abstract: ||多孔隙瀝青混凝土(Porous Asphalt Concrete, or PAC)具有高孔隙排水性，其優點包括環保、雨天車輛抗滑、利於排水、減少光反射、降低鋪面行車噪音等。本研究主要探討多孔隙瀝青混凝土添加兩種不同製程之爐石材料，在三種不同取代粗粒料的比例下，對鋪面成效及熱學性質造成的影響。兩種爐石包括轉爐石及滾筒碴，取代粗粒料比例為0%、30%及50%。成效試驗包含回彈模數、車轍試驗、抗滑試驗、及水份侵害試驗；混合料的熱學性質則評估熱傳遞、熱容量、以及熱傳導係數等性質。試驗結果顯示，兩種爐石材料較一般傳統粒料皆有較高的比重及吸水率，但健性及粒料磨損率則相對較低；從混合料各項試驗結果與統計分析可以發現，轉爐石取代粗粒料30%的多孔隙瀝青混凝土，在本研究中具有最佳的成效表現，熱傳導及熱擴散係數的結果亦為所有試驗組中的最高值。本研究結果認為轉爐石及滾筒碴皆能夠做為在設計多孔隙瀝青混凝土中取代粗粒料之材料;Porous asphalt concrete (PAC) is one alternative solution to the problem of stormwater drainage from parking and other low traffic density areas. The overall benefits of porous asphalt concrete may include both environmental and safety benefits including improved stormwater management, improved skid resistance, reduction of spray to drivers and pedestrians, reduction in light reflection and headlight glare, as well as a potential for noise reduction. However, there are disadvantages of this pavement type such as has lower service life than dense mixes. Steel slag is the material generated from purifying metal, their casting and alloying. It is steel slag that can be used as an aggregate substitution. The objective of this study was to evaluate the performance and thermal properties of porous asphalt concrete containing steel slag. |
Two types of steel slag were used to subtitute coarse aggregate, including Basic Oxygen Furnace (BOF) and Baoshan Slag Short Flow (BSSF). Three different percentages of steel slag, namely 0%, 30%, and 50%, were mixed. Two main aspects are investigated in this study. One is mixture performance, including resilient modulus, rutting potential, skid resistance, and moisture susceptibility test. The other is thermal properties characteristic, including thermal conductivity, thermal heat capacity, and thermal diffusivity. Statistical were utilized to determine which treatment has the best performance result.
The test results show that steel slag has higher specific gravity, high absorption, but lower L.A. abrasion, and soundness compared with natural aggregate. PAC containing steel slag may enhance the resilient modulus, skid resistance, rutting potential, and moisture susceptibility. However the application of high percentage of steel slag may decrease the performance of PAC, such as decrease skid resistance, rutting potential, and moisture susceptibility. The statistical analysis results show that PAC containing 30% of BOF slag has the best performance results, however this kind of pavement had the highest thermal conductivity and thermal diffusivity compared with others. The conclusions indicate that both BOF and BSSF slag are suitable to used as coarse aggregate substitution in PAC.