- 學位論文
剛性鋪面面層添加瀝青鋪面刨除料之工程性質研究
Properties of Reclaimed Asphalt Pavement-Filled Concrete of Rigid Pavements
摘要
國內每年產生瀝青鋪面刨除料（RAP）數量龐大，若能粒料化作為混凝土粒料再生利用，可協助解決砂石料短缺與廢棄物處置之問題。剛性鋪面（即水泥混凝土鋪面）之強度與耐久性優於柔性鋪面，惟韌性較差（近似脆性材料），若將RAP添加於剛性鋪面面層中，可增加剛性鋪面材料之韌性，改善其脆性破壞之趨勢。 本研究選用粒徑分佈ASTM No. 4篩∼No. 200篩之瀝青鋪面刨除料，以重量比0%、30%、60%比例取代天然粒料添加於水泥混凝土中，矽灰取代量則為水泥重量之0%及15%，製作水泥混凝土試體，進行含刨除料之水泥混凝土相關工程性質與績效試驗，並針對剛性鋪面面層之水泥混凝土版塊施加輪軸荷重與溫度翹曲，代入有限元素法分析程式進行力學模擬分析，以探討含刨除料之剛性鋪面面層之疲勞壽命特性。根據本研究試驗結果與剛性鋪面力學分析結果，獲得主要結論如下： 1.新拌混凝土性質方面，刨除料取代粒料用量增加時，因刨除料吸水率較天然粒料低，混凝土坍度略為增加。刨除料含有瀝青，比重比天然粒料略低，因此添加刨除料之混凝土單位重略微降低。 2.硬固混凝土力學性質方面，含有刨除料混凝土之抗壓強度、劈裂強度、抗彎強度皆隨刨除料含量增加而降低，其中混凝土抗彎強度隨刨除料降低之比率較抗壓強度低。 3.混凝土績效方面，含有刨除料混凝土破壞時之允許變形量增加，延展性提升，降低脆性破壞且韌性提升。添加刨除料混凝土試體之Cantabira磨耗百分比皆未超過之35%建議值，顯示刨除料混凝土具有抵抗粒料顆粒脫落飛散之能力。 4.剛性鋪面力學分析方面，由於各組彈性模數值較接近（邊緣荷重應力值也較接近），添加刨除料組別之抗彎強度卻較未添加刨除料組別低，因此添加刨除料組別之應力比較高，可能降低疲勞壽命。
並列摘要
Large quantity of reclaimed asphalt pavement (RAP) is produced each year from roadway maintenance work. In addition to current being recycled in HMA, the RAP might be used as aggregates for rigid pavements, and therefore help to alleviate the problems of natural aggregate shortage and waste disposal. Portland cement concrete (PCC) as rigid pavement surface is a brittle material, e.g., low in ductility. The addition of RAP to the PCC in rigid pavements might improve the toughness of concrete. This study was to investigate the properties of concrete with the inclusion of RAP. RAP (4.75mm~0.075mm in size) were used to replace portions of fine aggregate in concrete. RAP replacement rates of 0%, 30%, and 60% by weight of aggregate and silica fume replacement rates of 0%, and 15% by weight of cement were also arranged. Laboratory tests were performed on mortar, fresh and hardened concrete specimens, and stress analysis was executed for the RAP included concrete pavement. Based on the results of laboratory tests and stress analysis, major conclusions were summarized as follows: 1.The unit weight of of the RAP included concrete generally decreased with increasing RAP content because of the lower specific gravity of RAP. 2.The compressive, splitting, and flexural strengths of the RAP included concrete generally decreased with increasing RAP content. The reduction rate of the flexural strength was lower than that of the compressive strength in our study. 3.The measured deformations at failure of the RAP containing concrete were generally higher than that of the concrete without RAP. This was the indication of the improvement of ductility and toughness of the RAP containing concrete. 4.The results of the stress analysis showed that the stress ratios of the RAP containing concrete were generally higher than that of the concrete without RAP. The fatigue life of the RAP containing concrete might be shorter due to its higher stress ratio.