多孔性瀝青混凝土(PAC)具較高粗粒料含量所構築的高孔隙率，因此有高透水性能與減噪等優點，但較高的孔隙率也意味著更容易受到空氣與水等進入鋪面內部而造成PAC的老化與水侵害。老化後的PAC試體經由各項工程性質試驗，可以得知老化過程會使其短暫提高強度，但TSR值的下降與Cantabro磨損值的增加，顯示會對其黏結力及凝聚力造成影響；國道六號現地鑽心試體所萃取的瀝青黏度有顯著提昇，然而使用黏度較高的改質瀝青可以延緩老化趨勢。PAC試體含水率可以經由介電量測來評估內部含水量，可作為未來了解鋪面情況的非破壞檢測方式。
本研究結果顯示，PAC試體老化後的間接張力、穩定值、回彈模數等工程性質強度都呈現增加趨勢，其中以高黏度改質瀝青最佳，改質III型瀝青次之，AR80直餾瀝青最低；粒料間凝聚力則隨著瀝青老化而下降，但也與瀝青的黏度呈現相關性，在TSR殘餘強度試驗中以AR80下降最多，Cantabro磨損試驗也以AR80損失比率最大。不同最大標稱粒徑(NMAS)試體則以較小的12.5mm試體強度較佳，但抗車轍能力則以粒徑較大的19mm試體表現較好。國道六號現地鑽心試體的60℃黏度老化指數高於實驗室4天老化的結果，但呈現出相近趨勢，顯示現地PAC鋪面老化情形明顯，且使用黏度較高的改質瀝青不但有助於強度提升，更可以減緩其老化速度。對含水的PAC試體進行介電量測，藉由電磁波傳遞與反射，推估含水率與介電常數的相關性，並建立PAC的含水率預測模型，往後可以進一步作為現地鋪面含水率量測上的參考。

Porous asphalt concrete (PAC) has high content of coarse aggregates to build a high porosity, and therefore results in the properties of high permeability and noise reduction. However the higher porosity means that air and water can penetrate into the pavement, causing aging and moisture damage more easily. The engineering properties of the aged PAC were evaluated by various laboratory tests, and the results showed that the aging process increases the strength. However, the fact that the value of TSR was declined and the Cantabro abrasion loss was increasing due to the aging effect on the adhesive as well as cohesive properties. The viscosity values of bitumen extracted from the PAC cores on National No.6 Freeway had significantly raised. The results showed that the higher viscous asphalt could delay the aging trend according to aging index. In addition, the moisture content could be measured by the dielectric measurement to estimate the internal water content within PAC. It is suggested that the pavement conditions can be assessed by means of this non-destructive testing method in the future.
The result showed the increases in indirect tensile strength, Marshall stability and resilient modulus for aged PAC. In terms of the comparison of the three asphalt binders, the high-viscosity modified asphalt showed the best performance, and the type III modified asphalt and AR80 straight-run asphalt were followed. The adhesive property between aggregates and asphalt decreased along with aging process, but showed well correlation with the viscosity of the asphalt. An significant decrease and a considerable increase on TSR and on Cantabro abrasion loss on the PAC with AR80 asphalt. The PAC with nominal maximum aggregate size (NMAS) 12.5mm had higher strength, but the NMAS 19mm PAC showed the better resistance to rutting. The 60℃ viscosity aging index of bitumen extracted from the PAC cores on National No.6 Freeway was higher than the result of the laboratory specimens after aging 4 days, but presenting a similar trend. It showed that the PAC pavement was aged significantly, and the use of high viscosity modified asphalt not only improved strength, but also slowed down the aging rate. The moisture PAC specimens were carried out using the dielectric measurement by transmission and reflection of electromagnetic waves, to estimate the correlation between moisture content and dielectric constant. The establishment of PAC moisture content prediction model can be further as a reference for measuring pavement moisture content in the field.

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