摘要To explore the size effect of asphalt mixture, asphalt mastic asphalt mixture was taken as the research object, and the uniaxial compressive strength was used as the evaluation index. The applicability of the three size effect theories of Bazant, Carpinteri, and Weibull were evaluated, and the corresponding size effect law parameters were calculated. The critical dimensions and critical strength of the asphalt mixture were determined, and the effects of coarse aggregate properties, maximum nominal particle size, and loading rate on the size effect of asphalt mixture were analyzed. Results show that the asphalt mixture has an obvious size effect phenomenon, and the uniaxial compressive stress-strain curves of asphalt samples with different sizes have the characteristics of compaction stage, elastic stage, and transition from plastic deformation to failure stage. The uniaxial compressive strength of the asphalt mixture is negatively correlated with the sample size, and as the sample size increases, the strength reduction decreases gradually. With the increase in the elastic modulus of the coarse aggregate, the critical strength value increases continuously, and the critical dimension decreases. As the maximum nominal particle size increases, the critical dimension and critical strength increase gradually. With the increase in the loading rate, the critical strength continues to increase, and the critical dimension gradually decreases. The Bazant and Carpinteri size effect laws are more suitable for the analysis of the size effect of asphalt mixture, while the Weibull size effect law has a large error. When SMA is used as the pavement structural layer, the ratio S of the structural layer thickness to the maximum nominal particle size calculated by the Bazant size effect law is 2.6 to 3.5, and the S range calculated by the Carpinteri size effect law is 2.6 to 4.0.
Abstract：To explore the size effect of asphalt mixture, asphalt mastic asphalt mixture was taken as the research object, and the uniaxial compressive strength was used as the evaluation index. The applicability of the three size effect theories of Bazant, Carpinteri, and Weibull were evaluated, and the corresponding size effect law parameters were calculated. The critical dimensions and critical strength of the asphalt mixture were determined, and the effects of coarse aggregate properties, maximum nominal particle size, and loading rate on the size effect of asphalt mixture were analyzed. Results show that the asphalt mixture has an obvious size effect phenomenon, and the uniaxial compressive stress-strain curves of asphalt samples with different sizes have the characteristics of compaction stage, elastic stage, and transition from plastic deformation to failure stage. The uniaxial compressive strength of the asphalt mixture is negatively correlated with the sample size, and as the sample size increases, the strength reduction decreases gradually. With the increase in the elastic modulus of the coarse aggregate, the critical strength value increases continuously, and the critical dimension decreases. As the maximum nominal particle size increases, the critical dimension and critical strength increase gradually. With the increase in the loading rate, the critical strength continues to increase, and the critical dimension gradually decreases. The Bazant and Carpinteri size effect laws are more suitable for the analysis of the size effect of asphalt mixture, while the Weibull size effect law has a large error. When SMA is used as the pavement structural layer, the ratio S of the structural layer thickness to the maximum nominal particle size calculated by the Bazant size effect law is 2.6 to 3.5, and the S range calculated by the Carpinteri size effect law is 2.6 to 4.0.
基金资助:Supported by the National Natural Science Foundation Project(No.51774163)
通讯作者:
GE Li-na
E-mail: gln8223@163.com
引用本文:
葛丽娜, 易富, 赵琪琪. Size Effect and Influence Factors of Asphalt Mixture Based on Particle Discrete Element[J]. Journal of Highway and Transportation Research and Development, 2020, 14(3): 1-11.
GE Li-na, YI Fu, ZHAO Qi-qi. Size Effect and Influence Factors of Asphalt Mixture Based on Particle Discrete Element. Journal of Highway and Transportation Research and Development, 2020, 14(3): 1-11.
[1] WANG Qing-yuan, ZHU Wan-cheng, LIU Hong-lei, et al. Size Effect of Long-term Strength of Sandstone under Uniaxial Compression[J]. Rock and Soil Mechanics, 2016, 37(4):981-990. (in Chinese) [2] SU Jie, FANG Zhi. Scale Effect on Cubic Compressive Strength of Ordinary Concrete and High-strength Concrete[J]. Journal of Building Materials, 2013, 16(6):1078-1086. (in Chinese) [3] LIU Jian-you, ZHAO Yong, LI Peng-fei. Study of Size Effect of Deformation of Rockmass Surrounding Tunnel[J]. Rock and Soil Mechanics, 2013, 34(8):2165-2173. (in Chinese) [4] LIANG Zheng-zhao, ZHANG Yong-bin, TANG Shi-bin, et al. Size Effect of Rock Masses and Associated Representative Element Properties[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(6):1157-1166. (in Chinese) [5] LI Dong, JIN Liu, DU Xiu-li. Mesoscopic Simulation of the Mechanical Properties and the Size Effect of Reinforced Concrete Column Subjected to Axial Compressive Loading[J]. Journal of Hydraulic Engineering, 2016, 47(2):209-218. (in Chinese) [6] SYROKA-KOROL E, TEJCHMAN J. Experimental Investigations of Size Effect in Reinforced Concrete Beams Failing by Shear[J]. Engineering Structures, 2014, 58(7):63-78. [7] CHENG Zhi-cheng, XU Qing, XU Yi. Size Effect Study of Splitting Tensile Strength of Cement Mortar Cubic Specimen[J]. Engineering Journal of Wuhan University, 2018, 51(9):772-777. (in Chinese) [8] QU Yan-ling, YANG Qian, ZHANG Xiang-long. Numerical Study of Split-tensile Strength and Size Effect of Rolled Compacted Concrete on Meso-level[J]. Journal of Highway and Transportation Research and Development, 2008, 25(12):80-83. (in Chinese) [9] WANG Y, CHEN P, LIU C, et al. Size Effect of Circular Concrete-filled Steel Tubular Short Columns Subjected to Axial Compression[J]. Thin-Walled Structures, 2017, 120:397-407. [10] LI D, JIN L, DU X, et al. Size Effect Tests of Normal-strength and High-strength RC Columns Subjected to Axial Compressive Loading[J]. Engineering Structures, 2016, 109:43-60. [11] BARBHUIYA S, CHOUDHURY A M. A Study on the Size Effect of RC Beam-column Connections under Cyclic Loading[J]. Engineering Structures, 2015, 95:1-7. [12] REDDY D V, SOBHAN K, LIU L, et al. Size Effect on Fire Resistance of Structural Concrete[J]. Engineering Structures, 2015, 99:468-478. [13] LUO Dai-song, TIAN Chun-lin, GUO Meng, et al. Mix Design and Performance Verification of Modified Recycled Asphalt Mixture[J]. Journal of Highway and Transportation Research and Development, 2018, 35(12):7-13. (in Chinese) [14] GUO Jin-xing, ZHANG Shu-hua. Influence of Asphalt Types on SMA-13 Gradation[J]. Journal of Highway and Transportation Research and Development, 2018, 35(9):9-14. (in Chinese) [15] WANG Xiao-ming, ZHENG Yin-he. Review of Advances in Investigation of Representative Elementary Volume and Scale Effect of Fractured Rock Masses[J]. Rock and Soil Mechanics, 2015, 36(12):3456-3464. (in Chinese) [16] LI Kun-meng, LI Yuan-hui, XU Shuai, et al. Method to Determine Microscopic Parameters of PFC2D Numerical Model[J]. Journal of Northeastern University:Natural Science Edition, 2016, 37(4):563-567. (in Chinese) [17] LI Ming, PENG Wei, WANG Yan-wei. Microscopic Analysis for Uniaxial Compression Test of Asphalt Mixtures[J]. Journal of Shandong Jiaotong University, 2016, 24(1):64-69. (in Chinese) [18] YANG Jun, JIAO Li-ya, WANG Ke-li, et al. Three Dimensional Simulation of Virtual Triaxial Shear Test for Asphalt Mixture Based on Discrete Element Method[J]. Journal of Southeast University:Natural Science Edition, 2014, 44(5):1057-1061. (in Chinese) [19] WEIBULL W. A Statistical Distribution Function of Wide Applicability[J]. Journal of Applied Mechanics, 1951, 18(2):293-297. [20] LI Yong, ZHENG Jian-jun, JIN Xian-yu. Analysis and Application of Bazant's Size Effect Laws[J]. Concrete, 2003, 41(2):33-34, 41. (in Chinese) [21] BAŽANT Z P. Size Effect in Blunt Fracture:Concrete, Rock, Metal[J]. Journal of Engineering Mechanics, 1984, 110(4):518-535. [22] CARPINTERI A. Fractal Nature of Material Microstructure and Size Effects on Apparent Mechanical Properties[J]. Mechanics of Materials, 1994, 18(2):89-101.
2020, Vol. 14 
