Study on test standard of asphalt mixture dynamic modulus

XU Zhi-rong; CHANG Yan-ting; CHEN Zhong-da; SUN Jian; LIU Yun

doi:10.19818/j.cnki.1671-1637.2015.03.001

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XU Zhi-rong, CHANG Yan-ting, CHEN Zhong-da, SUN Jian, LIU Yun. Study on test standard of asphalt mixture dynamic modulus[J]. Journal of Traffic and Transportation Engineering, 2015, 15(3): 1-8. doi: 10.19818/j.cnki.1671-1637.2015.03.001

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XU Zhi-rong, CHANG Yan-ting, CHEN Zhong-da, SUN Jian, LIU Yun. Study on test standard of asphalt mixture dynamic modulus[J]. Journal of Traffic and Transportation Engineering, 2015, 15(3): 1-8. doi: 10.19818/j.cnki.1671-1637.2015.03.001

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Study on test standard of asphalt mixture dynamic modulus

doi: 10.19818/j.cnki.1671-1637.2015.03.001

1.
Key Laboratory of Highway Engineering for Special Region of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Yan'an New City Investment and Development Construction Co., Ltd., Yan'an 716000, Shaanxi, China
3.
Shaanxi Highway Bureau, Xi'an 710068, Shaanxi, China

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Author Bio:
XU Zhi-rong(1976-), male, senior engineer, doctoral student, +86-29-82335657, xzhr1976@163.com

CHEN Zhong-da(1956-), male, professor, PhD, +86-29-82335657, 0292335657@163.com
Received Date: 2015-01-17
Publish Date: 2015-06-20

Abstract

Abstract

Based on the foreign research achievements and experience, the dynamic modulus of asphalt mixture was measured by using unconfined compressive strength test method. The uneven distributions of static pressing specimens were verified, the making method of specimens was improved, and the cutting static pressing specimens were obtained. The porosities of 2 kinds of specimens were compared. According to Vander Poel formulas, load frequency was determined. The clearance loading mode was used, and the load cycle was determined based on the principle of specimens reaching steady vibration state. Dynamic modulus was calculated according to the average peak strains of last 5 load cycles. The load levels and strain measurement methods were determined, and the test data at stable phase were selected as the final test results. The dynamic moduli of cutting static pressing specimens were tested, and the mean value, mean square deviation and variation coefficient of dynamic moduli were calculated. Analysis result indicates that the average porosity of cutting static pressing specimens is 4.2%, and is far less than the average porosity of static pressing specimens, which is 6.5%. The discrete of cutting static pressing specimens is small, and the void distribution is uniform. Compared with static pressing specimens, the porosities of cutting specimens are closer to Marshall specimens, and the cutting specimens are easier to reach steady vibration state under loading. Haversine wave, load frequency of 10 Hz, load clearance time of 0.9 s and load level of 0.7 MPa are closer to the roles of traffic loads. The top surface method is used to measure the deformation of specimens. The specimens have reached steady vibration state when the load cycles is 200 times, so the load cycles is determined as 200 times. For a single specimen, the test data of 3-5 load cycles are selected to calculate dynamic modulus. When the difference between the dynamic modulus of 3 and 5 load cycles is no less than 200 MPa, the specimens should be discarded. The dynamic moduli of the 3 kinds of asphalt mixtures are 1 650-2 970 MPa, and the discrete is small. The mean square deviations of dynamic moduli are 100-230 MPa, the variation coefficients of dynamic moduli are 5%-9%, so the method is feasible.
- pavement,
- asphalt mixture,
- dynamic modulus,
- test standard,
- load,
- strain

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References(20)

References

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Study on test standard of asphalt mixture dynamic modulus

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