none
| Autor: | Yun-Ya Liu, 劉雲亞 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|