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| Quantitative Analysis Investigation of the Water Stability of Asphalt Mixtures with Crushed Gravel Based on the Theory of Surface Free Energy |
| DENG Chong1,2, LUO Rong2, ZHANG De-run2 |
1. China Highway Engineering Consultants Corporation, Beijing 100089, China;
2. School of Transportation, Wuhan University of Technology, Wuhan Hubei 430063, China |
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Abstract To quantitatively analyze and study the water stability of crushed gravel asphalt mixture by using surface energy theory, the surface energy parameters of crushed gravel samples at 20℃ are tested by using the gas sorption method, and the surface energy parameters of four anti-stripping agent asphalts with different dosages (0%, 0.2%, 0.4%, 0.6%) at 20℃ are tested by using the Wilhelmy plate method. Then, the binding energy of crushed gravel and anti-stripping agent asphalts with different dosages and the surface energy evaluation index of water stability are calculated. On this basis, quantitative analysis and sequencing of water stability of crushed gravel asphalt mixture were carried out. The microscopic mechanism of the anti-stripping agent's improvement on adhesion between crushed gravel and asphalt was analyzed from the angle of surface energy. Marshall test (immersion Marshall test, vacuum saturation Marshall test, freeze-thaw splitting test) with anti-stripping agent contents of 0%, 0.2%, 0.4%, and 0.6% was conducted through strict control of crushed gravel material, gradation, and oil-stone ratio. Results show that (1) the surface energy parameters of crushed gravel are dominated by polar alkali component; (2) the addition of anti-stripping agent will reduce the surface energy of asphalt, thus increasing the wettability of asphalt to aggregate; (3) the improvement of the adhesion between crushed gravel and asphalt by adding anti-stripping agent is mainly reflected in two aspects:reducing the cohesive energy of asphalt itself to increase its wettability to aggregate and increasing the surface energy acid component of asphalt to increase its adhesion binding energy to aggregate; and (4) the order of microscopic surface energy evaluation index of water stability of crushed gravel asphalt mixture is the same as that of macroscopic performance test index, thus demonstrating the accuracy of the surface energy system for quantitative analysis of the water stability of the crushed gravel asphalt mixture.
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Received: 19 February 2019
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| Fund:Supported by the Ministry of Transport Construction Science and Technology Plan Project(No.2014318J22120) |
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Corresponding Authors:
DENG Chong
E-mail: 1175789306@qq.com
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[1] LI Jian. Research on Road Performance of Crushed Gravel[D]. Xi'an:Chang'an University, 2011. (in Chinese)
[2] ZHANG Wei. Application of Broken Pebbles in Asphalt Pavement[D]. Wuhan:Wuhan University of Technology, 2012. (in Chinese)
[3] GUO Nai-sheng, WANG Xue-yuan, ZHAO Ying-hua. Mix Design of Granite Stone Mastic Asphalt (SMA) Mixture[J]. Journal of Building Materials, 2009, 12(2):197-200. (in Chinese)
[4] GUO Rong-chang, LIU Ling-qing. Effect of Anti-stripping Agent and Cement on Performance of Granite Asphalt Mixture[J]. Journal of China & Foreign Highway, 2013, 33(6):280-283. (in Chinese)
[5] XU Yun. Study on Properties of Different Anti-stripping Agents in Asphalt Mixture[J]. Journal of China & Foreign Highway, 2009, 29(5):246-249. (in Chinese)
[6] HE Lian-ming, ZHAO Zhe. Application of Crushed Gravel in Asphalt Pavement of Xinjiang Ka Yi Road[J]. Modern Transportation Technology, 2015, 12(2):17-19. (in Chinese)
[7] SONG Yan-ru, ZHANG Yu-zhen. The Evaluating Methods' Summary of Asphalt Adhesion[J]. Petroleum Asphalt, 2005, 19(3):1-6. (in Chinese)
[8] DENG Min, GAN Lin-kun. Comparison of Evaluating Methods for Adhesion between Asphalt and Aggregate[J]. Technology of Highway and Transport, 2008(3):45-47. (in Chinese)
[9] ZHAO Yong-li, WU Zhen, HUANG Xiao-ming, et al. Tests of Moisture Susceptibility for Asphalt Paving Mixtures[J]. Journal of Southeast University:Natural Science Edition, 2001, 31(3):99-102. (in Chinese)
[10] ZENG Jun, XIAO Gao-xia, LUO Zhi-gang, et al. Overview of Evaluation Methods for Test of Water Stability of Asphalt Mixtures[J]. Highway Traffic Technology, 2011(1):40-46. (in Chinese)
[11] VAN OSS C J, GIESE R F. Surface Modification of Clays and Related Materials[J]. Journal of Dispersion Science and Technology, 2003, 24(3/4):363-376.
[12] VAN OSS C J. Interfacial Forces in Aqueous Media[M]. 2nd ed. New York:CRC Press, 2006.
[13] BHASIN A, LITTLE D N. Characterization of Aggregate Surface Energy Using the Universal Sorption Device[J]. Journal of Materials in Civil Engineering, 2007, 19(8):634-641.
[14] CHENG D, LITTLE D N, LYTTON R L, et al. Surface Energy Measurement of Asphalt and Its Application to Predicting Fatigue and Healing in Asphalt Mixtures[J]. Transportation Research Record, 2002, 1810:44-53.
[15] LITTLE D N, BHASIN A. Using Surface Energy Measurements to Select Materials for Asphalt Pavement[R]. Washington, D.C.:Transportation Research Board, 2006.
[16] BHASIN A. Development of Methods to Quantify Bitumen-aggregate Adhesion and Loss of Adhesion due to Water[D]. College Station:Texas A&M University, 2006.
[17] GHABCHI R, SINGH D, ZAMAN M. Evaluation of Moisture Susceptibility of Asphalt Mixes Containing RAP And different Types of Aggregates and ASPHALT binders Using the Surface Free Energy Method[J]. Construction & Building Materials, 2014, 73:479-489.
[18] MASAD E A, BHASIN A, BRANCO V C, et al. System for the Evaluation of Moisture Damage Using Fundamental Material Properties[R]. College Station:Texas Transportation Institute, 2007.
[19] HOWSON J E, BHASIN A, MASAD E A, et al. Development of a Database for Surface Energy of Aggregates and Asphalt Binders[R]. College Station:Texas Transportation Institute, 2009. |
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2020, Vol. 14 
