Mixing power measurement at different mixing velocities and mixing rheological model of bituminous mixture
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摘要: 为了定量评价沥青混合料的和易性与深化认识其强度构成的演变机理, 基于沥青混合料的常规拌和设备, 自行开发了一种变速拌和功率测试装置V-P-Mixer, 进行了沥青混合料的拌和流变特性试验。针对不同沥青用量(0~8%)的AC-13C型沥青混合料, 在不同拌和温度(130℃~170℃)和不同拌和速率(20~50 r·min-1)下进行了拌和功率测试, 绘制了功率-速率流变图, 建立了黏塑性拌和流变模型, 并以拌和黏度的倒数定义了和易性指数。分析结果表明: 拌和消耗的电流、电压和有功功率的波动误差分别为2.25%、0.11%和5%, 重复再现误差为0.25%, 测试数据稳定、可靠, 可用来表征沥青混合料的拌和功率; 拌和流变模型服从线性的Bingham黏塑性模型, 流变直线的斜率可以表征沥青混合料的拌和黏度, 定义斜率的倒数为和易性指数; 拌和温度每升高10℃可降低拌和黏度和提高和易性指数10%~20%;沥青用量的增加会增大拌和的黏度和阻力, 每增加1%降低和易性指数5%~25%;从强度构成的演变机理来看, 碎石决定了内在塑性极限, 沥青决定了黏性强度。Abstract: In order to quantitatively evaluate the mixing workability and to deeply know the evolution mechanism of the strength of bituminous mixture, an experimental device of mixing power measurement at different velocities named V-P-Mixer was developed in laboratory based on the conventional mixing devices, and an experiment was carried out for the mixing rheological behavior of bituminous mixture.Based on AC-13C bituminous mixtures with different bitumen contents(0-8%), the mixing powers were measured at different mixing temperatures(130 ℃-170 ℃)and mixing velocities(20-50 r·min-1), the power-velocity diagrams were analyzed, a visco-plastic mixing rheological model was presented, and the workability index was defined as the reciprocal of mixing viscosity.Analysis result shows that the alternating errors of electric current, voltage and power consumed during mixing are respectively 2.25%, 0.11% and 5%, and the repeatability error is 0.25%, so the measurement is stable and reliable to characterize themixing power of bituminous mixture; the mixing rheological property obeys the linear Bingham model, in which the straight slope represents the general viscosity of bituminous mixture, and the reciprocal of the viscosity is defined as the workability index; when the temperature increases by 10 ℃, the mixture's viscosity decreases and the workability index increases by 10%-20%, so it is easier to mix; the mixing power and resistance increase with the increase of bitumen content, and the workability index decreases by 5%-25% when the bitumen content increases by 1%;aggregate plays plastic role, and bitumen plays viscous role in the strength mechanism of bituminous mixture.
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Key words:
- pavement material /
- bituminous mixture /
- mixing velocity /
- mixing power /
- rheological model /
- workability index
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图 5 沥青用量为5%的混合料拌和流变特性
Figure 5. Mixing rheological property of bituminous mixture with bitumen content 5%
图 7 内在塑限随沥青用量的变化规律
Figure 7. Changing rules of intrinsic plastic limit with bitumen content
图 8 和易性指数随沥青用量的变化规律
Figure 8. Changing rules of workability index with bitumen content
图 9 和易性指数随拌和温度的变化规律
Figure 9. Changing rules of workability index with mixing temperature
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[1] 王超, 田波, 孙涛, 等. 建立新拌水泥混凝土流变模型的试验方法[J]. 公路, 2014(1): 210-214. doi: 10.3969/j.issn.1671-2668.2014.01.055WANG Chao, TIAN Bo, SUN Tao, et al. Test method to build mixing rheological model of new concrete[J]. Highway, 2014(1): 210-214. (in Chinese). doi: 10.3969/j.issn.1671-2668.2014.01.055 [2] GUDIMETTLA J M, COOLEY L A, BROWN E R. Workability of hot-mix asphalt[J]. Transportation Research Record, 2004(1891): 229-237. [3] 侯曙光. 热拌与温拌沥青混合料和易性试验[J]. 南京工业大学学报: 自然科学版, 2011, 33(5): 36-39. doi: 10.3969/j.issn.1671-7627.2011.05.007HOU Shu-guang. Workability experiment of hot asphalt mixture and warm asphalt mixture[J]. Journal of Nanjing University of Technology: Natural Science Edition, 2011, 33(5): 36-39. (in Chinese). doi: 10.3969/j.issn.1671-7627.2011.05.007 [4] 王启洪, 徐绍东. 关于混凝土流变模型的研究[J]. 武汉建材学院学报, 1980(2): 53-57. https://www.cnki.com.cn/Article/CJFDTOTAL-WHGY198002006.htmWANG Qi-hong, XU Shao-dong. Study on the rheological model of cement concrete[J]. Journal of Wuhan Building Materials Institute, 1980(2): 53-57. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-WHGY198002006.htm [5] 刘国柱. 沥青混合料拌和流变特性研究[D]. 西安: 长安大学, 2011.LIU Guo-zhu. Asphalt mixture mixing rheological properties research[D]. Xi'an: Chang'an University, 2011. (in Chinese). [6] 叶群山. 纤维改性沥青胶浆与混合料流变特性研究[D]. 武汉: 武汉理工大学, 2007.YE Qun-shan. Research on the rheological characteristics of fiber modified asphalt binder and mixtures[D]. Wuhan: Wuhan University of Technology, 2007. (in Chinese). [7] 黄刚, 何兆益, 黄涛. 沥青混合料动态蠕变黏弹性特性分析[J]. 东南大学学报: 自然科学版, 2012, 42(6): 1211-1216. https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX201206033.htmHUANG Gang, HE Zhao-yi, HUANG Tao. Analysis of viscoelastic characteristics of asphalt mixtures in dynamic creep test[J]. Journal of Southeast University: Natural Science Edition, 2012, 42(6): 1211-1216. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX201206033.htm [8] 延西利, 梁春雨, 艾涛, 等. 基于沥青与石料界面剪切的黏塑性流变模型研究[J]. 土木工程学报, 2014, 47(2): 136-144. https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201402018.htmYAN Xi-li, LIANG Chun-yu, AI Tao, et al. Study on the visco-plastic model of the interfacial shear between bitumen and stone[J]. China Civil Engineering Journal, 2014, 47(2): 136-144. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201402018.htm [9] 金晓晴. LB(冷拌冷铺)沥青及其路面修补技术研究[D]. 西安: 长安大学, 2005.JIN Xiao-qing. Research on the maintenance technology by applying LB bitumen(cold mixture)[D]. Xi'an: Chang'an University, 2005. (in Chinese). [10] 杨超. ACMP改性沥青的温拌特性研究[D]. 西安: 长安大学, 2014.YANG Chao. Research on the warm mix characteristics of ACMP modified asphalt[D]. Xi'an: Chang'an University, 2014. (in Chinese). [11] 杜鹏. ACMP温拌沥青混合料的路用性能研究[D]. 西安: 长安大学, 2014.DU Peng. The study of the performance of ACMP warm mix asphalt[D]. Xi'an: Chang'an University, 2014. (in Chinese). [12] 薛淏文. 温拌沥青的技术评价方法及路用性能研究[D]. 西安: 长安大学, 2015.XUE Hao-wen. Study on technical evaluation method and road performance of warm mix asphalt[D]. Xi'an: Chang'an University, 2015. (in Chinese). [13] 田辉黎. 沥青混合料变速拌和的试验特性研究[D]. 西安: 长安大学, 2015.TIAN Hui-li. Experimental characteristics at varied mixing speed of bituminous mixture[D]. Xi'an: Chang'an University, 2015. (in Chinese). [14] 延西利, 雍黎明, 延梦璐, 等. ACMP沥青温拌性能的粘温曲线分析[J]. 中国公路学报, 2015, 28(8): 1-8. doi: 10.3969/j.issn.1001-7372.2015.08.001YAN Xi-li, YONG Li-ming, YAN Meng-lu, et al. Analysis of viscosity-temperature curve about warm mix property of ACMP bitumen[J]. China Journal of Highway and Transport, 2015, 28(8): 1-8. (in Chinese). doi: 10.3969/j.issn.1001-7372.2015.08.001 [15] DI BENEDETTO H, YAN Xi-li. Comportement mécanique des enrobés bitumineux et modélisation de la contrainte maximale[J]. Materials and Structures, 1994, 27: 539-547. doi: 10.1007/BF02473215 [16] 《中国公路学报》编辑部. 中国道路工程学术研究综述[J]. 中国公路学报, 2013, 26(3): 1-36. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201303003.htmEditorial Department of China Journal of Highway and Transport. Review on China's road engineering research: 2013[J]. China Journal of Highway and Transport, 2013, 26(3): 1-36. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201303003.htm [17] 郭平, 段凌云. Sasobit温拌沥青混合料和易性研究[J]. 山东农业大学学报: 自然科学版, 2012, 43(1): 119-123. doi: 10.3969/j.issn.1000-2324.2012.01.023GUO Ping, DUAN Ling-yun. Research on the workability of Sasobit warm mix asphalt[J]. Journal of Shandong Agricultural University: Natural Science, 2012, 43(1): 119-123. (in Chinese). doi: 10.3969/j.issn.1000-2324.2012.01.023 [18] 王彩芹. 从流变学理论分析混凝土和易性的测定方法[J]. 南水北调与水利科技, 2005, 3(增): 57-58. https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD2005S1022.htmWANG Cai-qin. Approach to meature concrete remoulding effort by fluid rheology[J]. South-to-North Water Transfers and Water Science and Technology, 2005, 3(S): 57-58. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD2005S1022.htm [19] 张琛, 汪海年, 尤占平, 等. 橡胶沥青混合料和易性与压实特性的相关性[J]. 东南大学学报: 自然科学版, 2016, 46(1): 202-208. https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX201601033.htmZHANG Chen, WANG Hai-nian, YOU Zhan-ping, et al. Correlation between workability and compaction property of rubber asphalt mixture[J]. Journal of Southeast University: Natural Science Edition, 2016, 46(1): 202-208. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX201601033.htm [20] KUMAR S A, SARVANAN U, KRISHNAN J M, et al. Rheological characterisation of modified binders at mixing and compaction temperature[J]. International Journal of Pavement Engineering, 2014, 15(9): 767-785. doi: 10.1080/10298436.2013.851792 [21] LIU Cong-hui, WU Shao-peng, LIU Quan-tao, et al. Rheological characteristics of aged asphalt binder[J]. Journal of Central South University of Technology, 2008, 15(1): 298-301. [22] KÖK B V, YILMAZ M, AKPOLAT M. Evaluation of the conventional and rheological properties of SBS + Sasobit modified binder[J]. Construction and Building Materials, 2014, 63: 174-179. doi: 10.1016/j.conbuildmat.2014.04.015 -
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