 Wysłany: Nie 12:06, 03 Kwi 2011 Temat postu: Road asphalt _3220 dynamic mechanical thermal anal |
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| Asphalt roads Dynamic mechanical analysis
Characterize the low temperature performance of asphalt . more fl 3 High build , etc.: road asphalt dynamic mechanical thermal analysis of 35 more high- temperature performance that is not satisfactory, the temperature susceptibility of asphalt is the degree of the improved needle of people characterized by a temperature index PI , that is 25. I5.30cc ( or 5cc) when the degree of needle were obtained by pressing the regression coefficient of d-# (P20-n porphyrin ■ brittle point t Ⅲ, penetration index value where PI , P for the needles were degrees ; A semi- logarithmic slope of the line ; K for the semi- logarithmic linear intercept. and then pin one index is calculated as follows : PI = ( 20-50oA (Ⅲ)) / (1 +50 AfPOl ¨) where , A i) for the pin on the number of people half- degree temperature, the slope of a straight line , PI says that the greater the temperature the better the performance of asphalt . is measured over asphalt Equivalent sample point and the needles were brittle index shown in Table 3, Table 3 shows , Zhenhai, 70 were older than 90 , 100 compared with 140 Karamay crack resistance and temperature stability of low temperature difference ; Karamay 9O than 110, Jiangyin 7O low temperature resistance than 9o Better crack resistance and temperature stability ; Yumen low temperature cracking resistance after aging and temperature stability worse. Dynamic mechanical analysis of the results obtained with this exactly the same , so the technical nature of the road asphalt DMA analysis can help Analysis in particular,tory burch, low temperature performance of asphalt within the temperature and low temperature sensitivity, avoid grading of the needle caused by human error selection. |
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