橡胶沥青评价指标和温拌橡胶沥青SMA混合料技术研究
发布时间：2018-08-02 11:44
【摘要】：废旧轮胎是一种资源,含有许多有益于改善沥青性能的成分,利用废旧轮胎胶粉改善沥青的性能,不论对提高沥青路面的使用性能、降低造价还是在节约社会资源和环境保护方面都有着巨大的经济价值和社会意义。然而,橡胶沥青技术对于我国公路界来说还是一项新技术,由于缺乏经验和规范性的要求,在橡胶沥青结合料和混合料的组成设计、生产工艺、评价指标、试验标准、施工技术与质量控制等方面还存在不少问题。本文对橡胶沥青的评价指标、温拌橡胶沥青及其SMA混合料技术、橡胶沥青的生产质量控制技术进行了研究。本文首先通过对25℃针入度和锥入度两个指标在评价橡胶沥青稠度(或软硬程度)方面的相关性、试验数据的离散性和指标对橡胶沥青力学作用原理的差异等方面的综合研究,揭示了锥入度作为橡胶沥青这种固-液两相材料的评价指标更具有科学适用性,提出采用25℃锥入度代替目前的针入度作为橡胶沥青的技术评价指标。此外,通过进一步对橡胶沥青锥入抗剪强度的规律特点、作为橡胶沥青评价指标的可行性及其指标的允许变化范围的研究,首次提出了可以采用锥入抗剪强度(25℃)作为橡胶沥青的技术评价指标。对25℃弹性恢复和回弹恢复两个指标在评价橡胶沥青弹性性能方面的异同、指标试验原理、影响两种弹性试验结果的机理等多方面进行了研究。结果表明,回弹恢复试验中橡胶沥青的受力状态和在实际路面中的受力状态更为接近,且检测结果不受胶粉颗粒周围应力集中的影响,对橡胶沥青弹性特性的表征更科学合理,因此提出用25℃回弹恢复替代我国目前采用的弹性恢复作为橡胶沥青弹性性能的评价指标。我国现有的橡胶沥青技术评价体系主要是沿袭的SBS等聚合物改性沥青的评价体系,本文对我国现有的橡胶沥青技术评价体系进行了修正,提出了更适宜于橡胶沥青这种固-液两相胶结材料的技术评价体系以及相应的试验仪器、试验方法。在施工控制方面,针对橡胶沥青生产过程中胶粉掺量偏差控制薄弱的现状,研究了胶粉掺量偏差对橡胶沥青性能指标的影响,提出了橡胶沥青的施工控制指标。通过有机降黏型Sasobit温拌剂和表面活性类温拌剂对橡胶沥青性能影响的研究,得出了不同温拌剂对橡胶沥青的影响特性,给出了橡胶沥青胶结料温拌剂选择的建议。通过对橡胶沥青和温拌橡胶沥青的黏度稳定性进行研究得出,Sasobit不但对橡胶沥青有显著降黏作用,而且能使橡胶沥青的黏度稳定性更好,有利于保证橡胶沥青性能和施工工艺的稳定。对橡胶沥青SMA混合料的温拌剂类型与掺量选择、拌和与压实施工温度确定、温拌工艺对混合料温拌降温效果的影响等问题进行了研究。研究表明,对于橡胶沥青SMA混合料的温拌施工,按照变温击实马歇尔试验法,采用Sasobit温拌剂并按湿法工艺掺入橡胶沥青质量的2%以上时可以达到比相应热拌施工温度降低20~30℃的施工要求,橡胶沥青混合料可按150~160℃的拌和温度进行生产。最后验证了Sasobit温拌橡胶沥青SMA混合料的路用性能及评价指标。对橡胶沥青预混搅拌技术、生产工艺和质量控制技术进行了研究,通过对搅拌流体的理论分析和动力学仿真,优化了橡胶沥青预混搅拌设备和工艺参数,应用PID串级温度控制系统对橡胶沥青的反应温度进行控制,提高了温度控制精度水平。通过铺筑试验路段检验,温拌橡胶沥青混合料的路用性能和工后检测均达到了项目对相应热拌混合料施工的技术要求,节能减排效果明显,表明所采用的温拌施工工艺是可行的。
[Abstract]:Waste tire is a kind of resource, which contains many ingredients beneficial to improving asphalt performance. Using waste tire rubber powder to improve asphalt performance is of great economic value and social significance in improving asphalt pavement performance, reducing cost or saving social resources and environmental protection. It is still a new technology for China's highway industry. Due to lack of experience and standardization, there are still many problems in the design of rubber bitumen binder and mixture, production process, evaluation index, test standard, construction technology and quality control. SMA mixture technology, the production quality control technology of rubber bitumen is studied. Firstly, the correlation of the consistency of rubber bitumen (or soft and hard), the discreteness of the test data and the difference of the principle of the force of rubber bitumen are studied by the two indexes of 25 degrees centigrade and cone penetration. The evaluation index of the solid liquid two phase material as the rubber bitumen is more scientific and applicable. It is proposed that the penetration of 25 centigrade is used instead of the current needle penetration as the technical evaluation index of rubber bitumen. In addition, it is feasible to be used as the evaluation index of rubber bitumen by further analyzing the regularity of the shear strength of the rubber bitumen. In the study of the allowable range of the property and its indexes, the technical evaluation index of the taper shear strength (25 degrees C) as rubber bitumen is proposed for the first time. The differences and similarities of the elastic properties of rubber bitumen, the principle of the index test and the mechanism of affecting the results of the two kinds of elastic tests, are the two indexes of elastic recovery and resilience recovery at 25 degrees C. The results show that the stress state of rubber bitumen in the rebound recovery test is closer to the stress state in the actual pavement, and the test results are not affected by the stress concentration around the rubber particles, and the elastic characteristic of rubber bitumen is more scientific and reasonable. Therefore, it is proposed to replace the current recovery in China by 25 C springback. The elastic recovery is used as the evaluation index of the elastic properties of rubber bitumen. The existing evaluation system of rubber asphalt technology in China is mainly the evaluation system of SBS and other polymer modified bitumen. In this paper, the existing technical evaluation system of rubber asphalt in China is revised, and it is more suitable for rubber bitumen as a solid liquid two phase cementation. The technical evaluation system of materials and the corresponding test instruments and test methods. In the field of construction control, in view of the weakness of rubber pitch deviation control in the production process of rubber bitumen, the influence of the offset of rubber powder on the performance index of rubber bitumen is studied, and the construction control index of rubber asphalt is put forward. Through the organic viscosity reduction Sasobit The influence of warm mixing agent and surface active agent on the performance of rubber bitumen was studied. The influence characteristics of different warm mixing agents on rubber bitumen were obtained. The selection of warm mixing agent for rubber asphalt cementing material was given. Through the study of the viscosity stability of rubber bitumen and warm mixed rubber asphalt, Sasobit not only had significant effect on rubber bitumen. The viscosity stability of rubber bitumen is better and it can ensure the stability of rubber bitumen performance and construction technology. The research on the influence of the temperature mixing process on the temperature mixing effect of the mixture of rubber asphalt SMA mixture, the selection of the type and content of the mixing and the mixing and compaction, the influence of the warm mixing process on the temperature and temperature of the mixture and so on. According to the warm mixing of rubber bitumen SMA mixture, according to the temperature variable compaction Marshall test method, the construction requirements of 20~30 C can be reduced to 20~30 C than the corresponding hot mix construction temperature when the Sasobit warm mixing agent is added to the quality of rubber asphalt according to the wet process. The rubber asphalt mixture can be produced at the mixing temperature of 150~160 C. Finally, the road performance and evaluation index of Sasobit warm mixed rubber asphalt SMA mixture are verified. The premixed mixing technology of rubber bitumen, production technology and quality control technology are studied. Through the theoretical analysis and dynamic simulation of the mixing fluid, the pre mixing and mixing equipment and process parameters of rubber asphalt are optimized, and the cascade temperature of PID is applied. The degree control system controls the reaction temperature of rubber bitumen and improves the level of temperature control precision. Through the test of the pavement test section, the road performance and post test of the warm mixed rubber asphalt mixture have reached the technical requirements for the construction of the corresponding hot mix mixture, and the effect of the joint energy reduction is obvious, indicating the warm mixing construction adopted. The process is feasible.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：U414
，
本文编号：2159319
[Abstract]:Waste tire is a kind of resource, which contains many ingredients beneficial to improving asphalt performance. Using waste tire rubber powder to improve asphalt performance is of great economic value and social significance in improving asphalt pavement performance, reducing cost or saving social resources and environmental protection. It is still a new technology for China's highway industry. Due to lack of experience and standardization, there are still many problems in the design of rubber bitumen binder and mixture, production process, evaluation index, test standard, construction technology and quality control. SMA mixture technology, the production quality control technology of rubber bitumen is studied. Firstly, the correlation of the consistency of rubber bitumen (or soft and hard), the discreteness of the test data and the difference of the principle of the force of rubber bitumen are studied by the two indexes of 25 degrees centigrade and cone penetration. The evaluation index of the solid liquid two phase material as the rubber bitumen is more scientific and applicable. It is proposed that the penetration of 25 centigrade is used instead of the current needle penetration as the technical evaluation index of rubber bitumen. In addition, it is feasible to be used as the evaluation index of rubber bitumen by further analyzing the regularity of the shear strength of the rubber bitumen. In the study of the allowable range of the property and its indexes, the technical evaluation index of the taper shear strength (25 degrees C) as rubber bitumen is proposed for the first time. The differences and similarities of the elastic properties of rubber bitumen, the principle of the index test and the mechanism of affecting the results of the two kinds of elastic tests, are the two indexes of elastic recovery and resilience recovery at 25 degrees C. The results show that the stress state of rubber bitumen in the rebound recovery test is closer to the stress state in the actual pavement, and the test results are not affected by the stress concentration around the rubber particles, and the elastic characteristic of rubber bitumen is more scientific and reasonable. Therefore, it is proposed to replace the current recovery in China by 25 C springback. The elastic recovery is used as the evaluation index of the elastic properties of rubber bitumen. The existing evaluation system of rubber asphalt technology in China is mainly the evaluation system of SBS and other polymer modified bitumen. In this paper, the existing technical evaluation system of rubber asphalt in China is revised, and it is more suitable for rubber bitumen as a solid liquid two phase cementation. The technical evaluation system of materials and the corresponding test instruments and test methods. In the field of construction control, in view of the weakness of rubber pitch deviation control in the production process of rubber bitumen, the influence of the offset of rubber powder on the performance index of rubber bitumen is studied, and the construction control index of rubber asphalt is put forward. Through the organic viscosity reduction Sasobit The influence of warm mixing agent and surface active agent on the performance of rubber bitumen was studied. The influence characteristics of different warm mixing agents on rubber bitumen were obtained. The selection of warm mixing agent for rubber asphalt cementing material was given. Through the study of the viscosity stability of rubber bitumen and warm mixed rubber asphalt, Sasobit not only had significant effect on rubber bitumen. The viscosity stability of rubber bitumen is better and it can ensure the stability of rubber bitumen performance and construction technology. The research on the influence of the temperature mixing process on the temperature mixing effect of the mixture of rubber asphalt SMA mixture, the selection of the type and content of the mixing and the mixing and compaction, the influence of the warm mixing process on the temperature and temperature of the mixture and so on. According to the warm mixing of rubber bitumen SMA mixture, according to the temperature variable compaction Marshall test method, the construction requirements of 20~30 C can be reduced to 20~30 C than the corresponding hot mix construction temperature when the Sasobit warm mixing agent is added to the quality of rubber asphalt according to the wet process. The rubber asphalt mixture can be produced at the mixing temperature of 150~160 C. Finally, the road performance and evaluation index of Sasobit warm mixed rubber asphalt SMA mixture are verified. The premixed mixing technology of rubber bitumen, production technology and quality control technology are studied. Through the theoretical analysis and dynamic simulation of the mixing fluid, the pre mixing and mixing equipment and process parameters of rubber asphalt are optimized, and the cascade temperature of PID is applied. The degree control system controls the reaction temperature of rubber bitumen and improves the level of temperature control precision. Through the test of the pavement test section, the road performance and post test of the warm mixed rubber asphalt mixture have reached the technical requirements for the construction of the corresponding hot mix mixture, and the effect of the joint energy reduction is obvious, indicating the warm mixing construction adopted. The process is feasible.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：U414
，
本文编号：2159319
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