结构自诊断沥青路面材料特性及其工程应用
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摘要
沥青混凝：土已被广泛应用于道路和桥梁的表而铺装。截止2012年底,我国高速公路总里程已经突破9万公里,位居世界第二位。随着我国公路事业发展日趋成熟,其工作重心已从单纯的建设逐步向建、管、养并举的发展模式转型,公路的预养护与养护工作已开始引起广泛的关注。结构自诊断沥青路面可以在路面结构出现早期病害时,通过电阻数据的采集与分析,科学的指导沥青路面的预养护与养护,使沥青路面在永久破坏之前采取相应的措施,恢复其正常服役的路用性能,从而延长服役寿命,减少养护成本,避免废旧沥青混凝土造成的生态环境影响,具有十分重要的经济效益和社会效益。
1.本文在结构自诊断沥青混凝上路面级配设计过程中,借鉴Superpave体积指标设计方法与贝雷参数法,并用马歇尔设计方法进行设计和验证,制备出了结构自诊断沥青混凝土。研究发现,结合试验中结构自诊断沥青混凝土的电阻值,AC-20结构自诊断沥青混凝土的贝雷参数范围CA值为0.5-0.65；FAc为0.35～0.45；FAf为0.35～0.4；确定了石墨掺量为3%,最佳沥青用量为4.8%。结构自诊断沥青混凝上的导电现象存在渗流现象,其导电相材料石墨掺量存在渗流阈值；其导电机理是导电颗粒内部接触效应和渗流效应的共同作用
2.本文以唐山曹妃甸工业区建设为契机铺筑了结构自诊断沥青路面试验段,借助施工单位设备,对结构自诊断沥青混合料的拌和、摊铺、电极植入、碾压进行了研究。研究表明,导电材料石墨的投放是从废粉二级回收装置中抽入到废粉仓内,再加入到拌和锅中。最佳拌合工艺为热骨料先干拌5秒,然后同时加入石墨和沥青,再拌和35秒。摊铺速度宜控制为1～3m/min,采用非接触式平衡梁控制摊铺厚度,摊铺松铺系数确定为1.2。电极植入采用下层电极预先固定,上层电极施工时埋设方式进行。碾压时,宜采用轮胎压路机初压,然后钢轮压路机与轮胎压路机交替复压,且宜在15min中内完成碾压。
3.本文在结构自诊断沥青路面试验段铺筑后,分别于建设初期、夏热期、冬冷期、春融期进行了为期一年的服役行为研究。从体积性能、高温稳定性、水稳定性、抗低温开裂性,抗疲劳性能的试验出发评价了其路用性能：综合曹妃甸地区气温、地质条件分析了多因素作用下其电学性能的变化。研究表明,建设初期,在合理有序的施工条件下,结构自诊断沥青路面具有良好的路用性能；经过夏热期、冬冷期、春融期一年的服役,其路用性能出现不同程度的下降。在多因素条件作用下,其电阻值有一定的增加,内部结构可能出现微裂纹,此外金属电极也遭受了不同程度的腐蚀。
4.本文在结构自诊断沥青路面试验段的基础上,对路面破损数据指标DR,路面结构承载力指标SSI,路面车辙深度指标RD,以及关键的路面电阻指标RI进行了数据采集和处理,建立了养护决策模型。研究表明,通过试验段数据的采集与分析,养护决策模型可以及时有效的对沥青路面进行综合评价。
The asphalt concrete has been widely applied in the road and bridge pavement By the end of2012, the highway mileage has reached90000kilometers in china which ranked the second in the world. With the development China's highway industry, the focus of work has been gradually turned a sample construction into a development pattern which includes build, manage and maintenance. And the pre-maintenance and maintenance has been aroused widely concern. Through the collecting and analyzing the resistance data, the self-monitoring asphalt concrete can be scientific guidance the pre-maintenance and maintenance of asphalt pavement in the early damage which occurred in the pavement structure. In order to avoid the permanent destroys, it's necessary to take corresponding measure to recover its normal pavement performance. It is of great importance to economic and social benefits that extend service life, reduce maintenance cost, and terrible environment which caused by waste asphalt concrete.
l.In this paper, during the design process of self-monitoring asphalt concrete grading, take examples by Superpave volume indicator design method and Bailey parametric method, then designing and proving with the use of Marshall design approach, and preparation the self-monitoring asphalt concrete. The research found that refer to the resistivity of self-monitoring asphalt concrete in the test, the bailey parametric of the AC-20self-monitoring asphalt CA is0.5～0.65, FAc is0.35～0.45, FAf is0.35～0.4; and it also determined the graphite content is3%and the best asphalt dosage is4.8%.There is transfusion phenomenon which exists in the electric conduction phenomenon of self-monitoring asphalt concrete, percolation threshold existence in graphite content, and its conductive mechanism is as a result of conductive particles inside contact effect and transfusion effect combined action
2. This paper based on the industrial construction of Caofeidian, Tangshan, paved a self-monitoring asphalt concrete test section, with the help of construction organization equipment, studied the mixing, paving, electrode embedding and compacting of self-monitoring asphalt mixture. The study showed that the addition of graphite is extract from second powder recycle device, and add to the mixing pot. The optimum batch process is hot aggregate dry mixing5seconds, and adds graphite and asphalt at the same time, then mixing35seconds. Paving speed should be controlled in1～3m/min, using non-contact balance beam control paving thickness, identify the paving thickness coefficient is1.2. Electrode embedded needs two steps as follows: lower electrode fixed first, then embedded upper electrode in construction. During compacting, should be used tyre roller pressure first, and then used steel roller and tyre roller alternate pressure within15minutes.
3. In this paper, after the self-monitoring asphalt pavement test section construction, chosen four periods which are the early construction stage, summer period, winter period and the spring melt period as study object for one year service. Evaluate its pavement performance through several tests such as volume performance, high temperature stability, water stability, low temperature cracking resistance and fatigue resistance performance. And analyzed the variation of electrical performance under multiple factors and taken the temperature of Caofeidan and geological conditions into consideration. The research found that at the beginning of the construction, with the orderly execution conditions, the self-monitoring asphalt pavement has a good performance. After one year service of summer period, winter period and spring melt period, the pavement performance has been different degree decline. Under multi-factor conditions, its resistance value increased, micro cracks may occur in the internal structure, and in addition, metal electrodes also suffered inordinately corrosion.
4. In this paper, on the basis of the self-monitoring asphalt pavement test section, established a maintenance-decision model after data acquisition and processing which include the pavement damage date index DR, the pavement structure capacity index SSI, the pavement track depth index RD and the key pavement resistivity index RI. The study showed the through the test section data collection and analysis, the maintenance-decision model can be timely and effectively make a comprehensive assessment to the asphalt pavement.
1.本文在结构自诊断沥青混凝上路面级配设计过程中,借鉴Superpave体积指标设计方法与贝雷参数法,并用马歇尔设计方法进行设计和验证,制备出了结构自诊断沥青混凝土。研究发现,结合试验中结构自诊断沥青混凝土的电阻值,AC-20结构自诊断沥青混凝土的贝雷参数范围CA值为0.5-0.65；FAc为0.35～0.45；FAf为0.35～0.4；确定了石墨掺量为3%,最佳沥青用量为4.8%。结构自诊断沥青混凝上的导电现象存在渗流现象,其导电相材料石墨掺量存在渗流阈值；其导电机理是导电颗粒内部接触效应和渗流效应的共同作用
2.本文以唐山曹妃甸工业区建设为契机铺筑了结构自诊断沥青路面试验段,借助施工单位设备,对结构自诊断沥青混合料的拌和、摊铺、电极植入、碾压进行了研究。研究表明,导电材料石墨的投放是从废粉二级回收装置中抽入到废粉仓内,再加入到拌和锅中。最佳拌合工艺为热骨料先干拌5秒,然后同时加入石墨和沥青,再拌和35秒。摊铺速度宜控制为1～3m/min,采用非接触式平衡梁控制摊铺厚度,摊铺松铺系数确定为1.2。电极植入采用下层电极预先固定,上层电极施工时埋设方式进行。碾压时,宜采用轮胎压路机初压,然后钢轮压路机与轮胎压路机交替复压,且宜在15min中内完成碾压。
3.本文在结构自诊断沥青路面试验段铺筑后,分别于建设初期、夏热期、冬冷期、春融期进行了为期一年的服役行为研究。从体积性能、高温稳定性、水稳定性、抗低温开裂性,抗疲劳性能的试验出发评价了其路用性能：综合曹妃甸地区气温、地质条件分析了多因素作用下其电学性能的变化。研究表明,建设初期,在合理有序的施工条件下,结构自诊断沥青路面具有良好的路用性能；经过夏热期、冬冷期、春融期一年的服役,其路用性能出现不同程度的下降。在多因素条件作用下,其电阻值有一定的增加,内部结构可能出现微裂纹,此外金属电极也遭受了不同程度的腐蚀。
4.本文在结构自诊断沥青路面试验段的基础上,对路面破损数据指标DR,路面结构承载力指标SSI,路面车辙深度指标RD,以及关键的路面电阻指标RI进行了数据采集和处理,建立了养护决策模型。研究表明,通过试验段数据的采集与分析,养护决策模型可以及时有效的对沥青路面进行综合评价。
The asphalt concrete has been widely applied in the road and bridge pavement By the end of2012, the highway mileage has reached90000kilometers in china which ranked the second in the world. With the development China's highway industry, the focus of work has been gradually turned a sample construction into a development pattern which includes build, manage and maintenance. And the pre-maintenance and maintenance has been aroused widely concern. Through the collecting and analyzing the resistance data, the self-monitoring asphalt concrete can be scientific guidance the pre-maintenance and maintenance of asphalt pavement in the early damage which occurred in the pavement structure. In order to avoid the permanent destroys, it's necessary to take corresponding measure to recover its normal pavement performance. It is of great importance to economic and social benefits that extend service life, reduce maintenance cost, and terrible environment which caused by waste asphalt concrete.
l.In this paper, during the design process of self-monitoring asphalt concrete grading, take examples by Superpave volume indicator design method and Bailey parametric method, then designing and proving with the use of Marshall design approach, and preparation the self-monitoring asphalt concrete. The research found that refer to the resistivity of self-monitoring asphalt concrete in the test, the bailey parametric of the AC-20self-monitoring asphalt CA is0.5～0.65, FAc is0.35～0.45, FAf is0.35～0.4; and it also determined the graphite content is3%and the best asphalt dosage is4.8%.There is transfusion phenomenon which exists in the electric conduction phenomenon of self-monitoring asphalt concrete, percolation threshold existence in graphite content, and its conductive mechanism is as a result of conductive particles inside contact effect and transfusion effect combined action
2. This paper based on the industrial construction of Caofeidian, Tangshan, paved a self-monitoring asphalt concrete test section, with the help of construction organization equipment, studied the mixing, paving, electrode embedding and compacting of self-monitoring asphalt mixture. The study showed that the addition of graphite is extract from second powder recycle device, and add to the mixing pot. The optimum batch process is hot aggregate dry mixing5seconds, and adds graphite and asphalt at the same time, then mixing35seconds. Paving speed should be controlled in1～3m/min, using non-contact balance beam control paving thickness, identify the paving thickness coefficient is1.2. Electrode embedded needs two steps as follows: lower electrode fixed first, then embedded upper electrode in construction. During compacting, should be used tyre roller pressure first, and then used steel roller and tyre roller alternate pressure within15minutes.
3. In this paper, after the self-monitoring asphalt pavement test section construction, chosen four periods which are the early construction stage, summer period, winter period and the spring melt period as study object for one year service. Evaluate its pavement performance through several tests such as volume performance, high temperature stability, water stability, low temperature cracking resistance and fatigue resistance performance. And analyzed the variation of electrical performance under multiple factors and taken the temperature of Caofeidan and geological conditions into consideration. The research found that at the beginning of the construction, with the orderly execution conditions, the self-monitoring asphalt pavement has a good performance. After one year service of summer period, winter period and spring melt period, the pavement performance has been different degree decline. Under multi-factor conditions, its resistance value increased, micro cracks may occur in the internal structure, and in addition, metal electrodes also suffered inordinately corrosion.
4. In this paper, on the basis of the self-monitoring asphalt pavement test section, established a maintenance-decision model after data acquisition and processing which include the pavement damage date index DR, the pavement structure capacity index SSI, the pavement track depth index RD and the key pavement resistivity index RI. The study showed the through the test section data collection and analysis, the maintenance-decision model can be timely and effectively make a comprehensive assessment to the asphalt pavement.
引文
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