液体橡胶基混凝土的时效和加速老化试验研究

发布时间：2018-10-24 19:35

【摘要】：液体橡胶基混凝土是一种新型的工程材料，具有潜在的工程应用前景。课题组前几年的研究主要集中在该材料在钢桥面铺装中的适用性方面，包括了配合比的优化设计、材料的准静态力学性能、路用性能、冲击和疲劳力学性能、以及在荷载作用下的寿命预测等方面。由于橡胶类材料在自然环境下的时效和老化对其性能有很大的影响，而对于这种工程材料的时效和老化性能在国内外研究中尚未见到报道。本论文的研究将为液体橡胶基混凝土的耐候性和耐老化性能提供实验依据和参考。本文主要围绕液体橡胶基混凝土材料在室内环境中的时效影响，以及在加速老化环境中的性能变化，研究了时效和加速老化对液体橡胶基混凝土力学性能的影响。具体工作如下：（1）研究了液体橡胶材料的拉伸和压缩力学性能随着室内放置时间的变化，研究了时效对液体橡胶基混凝土材料的压缩和抗折性能的影响。（2）研究了加速老化对液体橡胶基混凝土压缩和抗折力学性能的影响，，进行了紫外线耐气候老化实验，得到了加速老化前后液体橡胶基混凝土的抗压强度、抗折强度等力学性能，分析了液体橡胶基混凝土的老化性能，建立了老化寿命预测模型，对材料的长期老化性能进行了预测。（3）研究了通过三维CT扫描图像估算液体橡胶基混凝土的弹性模量的方法，提出了一种基于细观结构单元串并联模型的等效方法，对液体橡胶基混凝土的弹性模量进行了估算，并分析了细观结构单元尺寸对估算结果的影响。
[Abstract]:Liquid rubber based concrete is a new type of engineering material, which has potential engineering application prospect. In previous years, the study group mainly focused on the applicability of the material in steel bridge deck pavement, including the optimum design of the mix ratio, the quasi-static mechanical properties of the material, the road performance, the impact and fatigue mechanical properties. And the life prediction under the action of load and so on. The aging and aging of rubber materials in natural environment have great influence on their properties, but the aging and aging properties of this kind of engineering materials have not been reported in domestic and foreign studies. The research in this paper will provide experimental basis and reference for weathering resistance and aging resistance of liquid rubber based concrete. The effects of aging and accelerated aging on the mechanical properties of liquid rubber-based concrete are studied in this paper, focusing on the aging effect of liquid rubber based concrete materials in indoor environment and the performance changes in accelerated aging environment. The main works are as follows: (1) the changes of tensile and compression mechanical properties of liquid rubber materials with the time of placing in the room were studied. The effect of aging on the compressive and flexural properties of liquid rubber based concrete was studied. (2) the effect of accelerated aging on the compressive and flexural properties of liquid rubber based concrete was studied. In this paper, the mechanical properties of liquid rubber based concrete before and after accelerated aging are obtained. The aging performance of liquid rubber based concrete is analyzed, and the aging life prediction model is established. The long-term aging properties of the material were predicted. (3) the method of estimating the elastic modulus of liquid rubber based concrete by 3D CT scanning image was studied. An equivalent method based on the series-parallel model of mesoscopic structural elements is proposed to estimate the elastic modulus of liquid rubber-based concrete and the influence of the size of meso-structure elements on the estimation results is analyzed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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