MA混合料模拟制备装置设计与应用研究

发布时间：2018-04-08 20:13

本文选题：MA混合料　切入点：模拟设备　出处：《华南理工大学》2014年博士论文

【摘要】：钢桥面铺装层受复杂多变的自然环境影响以及繁重的交通负荷作用，工作条件十分复杂，一直受到国内外学术界与工程界的高度重视与关注。现阶段，国内外钢桥面铺装方案主要有双层SMA类、浇注式类（分Mastic Asphalt及GussAsphalt二种，分别简称MA、GA）、环氧类和ERS类。与其他铺装方案相比，MA（Mastic Asphalt）具有密水、耐老化、抗疲劳和随从变形能力好等优点，其生产工艺是将原材料在Cooker车连续拌和，拌和时间较长（4～6小时），施工效率较低，不能很好满足项目工程量大、施工期紧的要求。而GA（Guss Asphalt）采用沥青拌和楼对所有原材料进行集中拌和生产，连续施工，施工效率较高，但GA混合料的稳定性略逊于MA混合料。因此，为了充分发挥MA混合料的性能稳定优势和GA工艺的工效优势，本文提出利用沥青拌和楼拌和MA混合料的方法有助于解决上述问题。但作为一种全新的工艺，其中可能存在的问题包括：（1）目前试验室内采用的常规沥青混合料拌和设备不能满足要求，有必要研制室内小型相似拌和设备。（2）为了确保利用模拟设备生产MA混合料具有优良的使用性能，确定合理的拌和工艺参数，，发挥各自优势有必要进行研究。（3）利用模拟设备生产MA的混合料的实际性能路用如何，有必要采用加速加载试验，验证利用足尺设备生产的MA、与利用模拟设备生产MA混合料的性能进行对比。基于此，本文开展了MA混合料的试验设备研制与利用模拟设备生产MA混合料的应用研究，为该工艺的推广以及全面运用于实体工程生产提供理论依据和技术支持。本文开展的主要研究工作及所得结论如下：（1）提出了既能充分发挥MA级配的性能稳定优势，又能发挥GA工艺的工效优势的沥青拌和楼拌和MA工艺，介绍了本文拟用的MA混合料评价方法与技术指标，用试验结果说明研制室内试验设备的必要性。。（2）针对目前室内搅拌设备无法准确模拟拌和MA混合料的工况，MA混合料的室内试验研究结果有很多局限性，为满足MA混合料的试验要求，设计并试制了MA混合料室内小型搅拌设备。叶片安装角为30°时，混合料的宏观和微观均匀度最好；拌缸温度控制在220°时搅拌效果更优于其他温度；长宽比小于1的宽短形搅拌缸比长宽比大于1的窄长形搅拌缸搅拌效果更好。（3）Cooker拌和工艺对浇注式混凝土的性能影响很大。而目标配合比设计以及大量的室内研究单次需要混合料的数量很少，如采用常规Cooker运输车来生产将造成极大的浪费。通过对常规保温搅拌运输车Cooker的结构、机理进行分析，通过相似理论设计方法，研制出室内模拟Cooker设备供试验室进行MA混合料室内试验使用。（4）利用小型搅拌设备与模拟Cooker组合对MA混合料进行了室内试验研究，重点研究拌和工艺对MA混合料性能的影响，从MA混合料的触变特性、老化性和工作性方面考虑，适宜的拌和参数为拌和温度220℃，拌和时间1.5小时，转速为7转/min。（5）采用加速加载试验对利用两种生产方式生产的MA混合料的高温性能和疲劳性能进行比较研究，结果表明：采用不同生产方式生产的MA混合料的实际路用性能接近。
[Abstract]:The steel bridge deck pavement layer by the complex natural environment and traffic load is heavy, working conditions are very complex, and has received great attention and concern of domestic and foreign academia and engineering. At present, domestic and foreign steel deck pavement scheme of double major class SMA, class Mastic pouring type (Asphalt and GussAsphalt two which were referred to as MA, GA), epoxy and ERS. Compared with other solution, MA (Mastic Asphalt) has the advantages of dense water, anti-aging, anti fatigue and attendant deformation ability is good, the production process is the continuous mixing of raw materials in the Cooker car, mixing time (4~6 hours). The construction efficiency is low, can not meet the project is large, the construction period tight requirements. GA (Guss Asphalt) using asphalt mixing plant for centralized mixing production, all the raw materials of continuous construction, the construction efficiency is high, but the stability of GA mixture Very close to MA mixture.
Therefore, in order to stable performance advantages and GA technology and give full play to the advantages of MA mixture efficiency, this paper proposes to use the method of asphalt mixing plant mixing MA mixture to help solve these problems. But as a new technology, the possible problems include: (1) using the conventional indoor test of asphalt mixing equipment can not meet the requirements, it is necessary to develop indoor small similar mixing equipment. (2) in order to ensure that the material with excellent performance by simulation equipment for the production of MA mixture, mixing to determine reasonable process parameters, their advantage is necessary to carry out research. (3) the actual mixture road performance using simulation equipment how to use MA, it is necessary to adopt the accelerated loading test, verified by full-scale production equipment MA, compared with the performance using simulation equipment for the production of MA mixture.
Based on this, this paper carried out the simulation of equipment manufacture and application of MA mixture design test equipment of MA mixture and utilization, provide theoretical basis and technical support for the promotion of this process and fully applied to real engineering production. This paper carried out the following main research work and conclusions:
(1) proposed can give full play to the performance advantages of MA stable gradation, asphalt mixing plant mixing process of MA can play GA process efficiency advantage, this paper introduces the proposed MA mixture evaluation methods and technical indexes, the necessity of development of laboratory test equipment. Experiment results show that the
(2) aiming at the interior mixing equipment can not accurately simulate the mixing of MA mixture conditions, laboratory tests on MA mixture results have many limitations, to meet the test requirements of MA mixture, designed and manufactured a MA mixture of small indoor mixing equipment. The blade installation angle is 30 degrees, the macro and micro mixing the best material uniformity; mixing cylinder temperature control in 220 degrees when the stirring effect is better than other temperature; the ratio of length to width wide short form less than 1 of the mixing cylinder than the length width ratio is greater than 1 of the narrow and long mixing tank mixing effect is better.
(3) Cooker greatly influences the mixing process on the performance of pouring concrete. And the target is less than the number with a large number of indoor study design and single to mixed material, such as the use of conventional Cooker vehicle production will cause great waste. By mixing structure transport vehicle Cooker of conventional insulation mechanism were analyzed, through the design method of similarity theory, developed the indoor analog Cooker equipment MA using mixture laboratory test for test chamber.
(4) the use of small mixing equipment and Simulation of Cooker combination of MA mixture were studied, focusing on the influence of mixing process on the properties of MA mixture, from the thixotropic properties of MA mixture, aspects of aging and work, mixing appropriate parameters of the degree of 220 DEG C for Ban Hewen, the mixing time of 1.5 hours. Speed of 7 rpm /min.
(5) accelerated loading test was used to compare the high temperature performance and fatigue performance of MA mixture produced by two production methods. The results showed that the actual road performance of MA mixture produced by different production methods was close.

【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U415.52

【参考文献】