摘要 公路總局目前所使用之瀝青混凝土規格為粗級配C-3 及密級配 D-3，係沿用交通部49 年版「公路工程施工規範」，為符合交通部90 年版規範，實有重新修訂之必要。公路總局材料試驗所建議分別採用 交通部現行90 年版施工規範之「表3-21 第一類型密級配」及「表 3-23 第二類型底層粗級配」修正公路總局目前所使用規範，並藉由 試驗道路試鋪到長期成效追蹤檢討，來評估所選用之新規格瀝青混凝 土的成效，並進一步檢討新規格是否符合公路總局目前道路工程之需 求。經過本試驗之評估，以台灣地區粒料可符合生產新規格瀝青混凝 土的標準，承攬公路工程之相關廠商亦有能力生產新規格瀝青混凝 土，為避免在台灣高溫地區道路產生冒油情形，瀝青混凝土含油量的 管控很重要，在較佳含油量方面，應為一個區域而非一個點，在台灣 南部地區因平均氣溫較高，亦可參考選用黏滯度較高之瀝青作拌和材 料。在施工方面，仍可參照公路總局86 年版施工說明書中之瀝青混 凝土篇相關規定辦理，唯在生產品質方面應注意的是新規格瀝青混凝 土25mm 粗級配及25mm 密級配，瀝青廠常可能因25mm 篩網未能嚴格 管控，和市場25mm 粒料使用較不普遍情形等因素影響，而使得拌合 廠之混合料產生偏細現象，而影響混合粒料之品質。試驗道路成效評 估結果大致良好，與原有瀝青混凝土比較差異不大，本次僅作一年之 成效評估，建議繼續追蹤該試驗道路之成效，才可更準確評估其長期 產生之效益，綜合上面幾點，新規格瀝青混凝土應可在公路總局轄區 道路廣泛使用，對提升道路工程之品質、道路之服務性均有很大之助 益。 Abstract Directorate General of Highway continues using the 1958 edition of ”Highway Construction Technical Provision” published by Ministry of Transportation and Communication （MOTC）as a guide of pavement construction now and before. In this technical provision C-3 grade coarse aggregate and D-3 grade dense aggregate are served as the applied specifications of aggregate used in Asphalt Concrete mixture. It is necessary for Directorate General of Highway to amend its paving material specification in order that all the correlated quality of paving material should conform to the 2001 edition of ”Highway Construction Technical Provision” revised by MOTC. Therefore, the Material Testing Laboratory Office of Directorate General of Highway advise that adopting Table 3-21 （Type-I Dense Grade Aggregate）and Table 3-23 （Type-II coarse grade aggregate utilized in base course） specified in this 2001 edition technical provision to amend specification of aggregate used in Asphalt Concrete mixture, and by means of Test Road Review to trace its long-term performance and to evaluate performance of these new grade asphalt concrete，so as to get a step further to review whether this new Technical provision fit in with the requirement of Directorate General of Highway in its working out highway pavement construction. Through an evaluation of test road, the collected data have verified that aggregate produced from Taiwan area can fit in with these new grade asphalt concrete, and the correlated contractors who take charge of highway pavement construction are capable of producing asphalt concrete mixture conforming to this new standards. For avoiding bleeding defect of asphalt concrete pavement occurred in high temperature area, the quality control factor of asphalt content is much more important, and better asphalt content is not so much existing at a point as distributing in an area. Also some high viscosity grade asphalt can be selected to serve as binding material of asphalt concrete mixture. While manipulating construction in practice, the correlated regulation specified in asphalt concrete part of 1997 edition “Technical specification of highway construction” revised by Directorate General of Highway can still be consulted to. But in the phase of production quality, we should pay attention to 25mm coarse grade aggregate and 25mm Dense Grade Aggregate stated in this new standard. Mix plants are likely to ignore the quality control of 25mm sieve Aggregate in use, and tending to produce a fine grade deviating phenomenon in asphalt concrete mixture, because 25mm grade aggregate is not prevailing in Taiwan asphalt concrete market so as to result in an influence of quality referring to asphalt concrete mixture. The result of Test Road performance evaluation is good in substance, but there is no apparent difference while comparing with the original standard of asphalt concrete in their initial performance owing to the evaluation last only one year. Therefore, it is suggested that the performance tracing should be continued so as to build up long term performance data and find out its benefit more accurately from Test Road. To sum up then, this new standard asphalt concrete can widely be put to use in the area under management of Directorate General of Highway; and it is very helpful for Directorate General of Highway to acquire favorable public impressions and raise highway construction quality up to pavement serviceability.
