混凝土泵送系统管道负载特性研究

发布时间：2018-06-15 11:25

本文选题：混凝土流变学 + Bingham模型　；参考：《浙江大学》2013年硕士论文

【摘要】：混凝土泵送系统管道负载,指混凝土在管道内的流动对泵送系统产生的负载。研究混凝土负载对于泵送混凝土施工过程的控制,泵送混凝土配合比设计,提高混凝土泵送系统效率,指导泵送系统设计,增加泵送系统寿命都有重要意义。本课题以混凝土泵送系统管道负载特性为研究对象,基于混凝土流变学Bingham模型,对混凝土的流变学特性,泵送混凝土工作性,以混凝土管道负载理论推导为依据,采用理论与实验相结合的方法,对混凝土管道负载进行了研究。论文主要分为7章,现分述如下：第一章对混凝土泵送系统工作原理及存在问题进行了简单介绍,介绍了混凝土工作性对混凝土管道负载的影响,介绍了混凝土负载特性研究的流变学基础,以及本课题的项目来源与研究意义。第二章介绍了本课题的课题研究目标以及课题研究思路,结合课题研究思路介绍了本课题的具体研究内容。第三章首先借助现有研究,分析了混凝土流变性与工作性之间的联系,之后分别介绍了混凝土配合比改变对混凝土工作性的影响,以及这配比对混凝土流变性的影响。第四章介绍了混凝土工作性流变实验,通过改变混凝土的配比得到不同工作性和流变性的混凝土,之后通过对混凝土样品工作性和流变参数的测试,得到工作性流变参数范围。分析配比与流变参数之间的关系后,对比工作性流变参数范围,得出依据混凝土工作性的出的混凝土最佳配合比。积累混凝土工作性判定经验,为后续实验提供保证。第五章结合Bingham模型分析了混凝土在管道内的流动状态,首先确定混凝土在管道内为层流,之后根据Bingham模型,确定混凝土在管道内为柱塞流。并依据Bingham模型,推导出了混凝土直管道的压降模型,即混凝土管道负载理论模型。第六章根据混凝土管道负载理论模型,确定影响混凝土管道负载的主要因素,以此为依据设计混凝土管道负载实验,根据管道压降,拟合混凝土管道压降公式,分析管道负载特性,之后根据现有研究成果设计了改进的混凝土管道负载实验。第七章对本课题的研究工作进行了总结与展望。
[Abstract]:Concrete pumping system pipe load, refers to the flow of concrete in the pipeline produced by the pumping system load. It is of great significance to study the concrete load for the control of the construction process of the pumping concrete, the design of the mix ratio of the pumping concrete, the improvement of the efficiency of the concrete pumping system, the guidance of the design of the pumping system, and the increase of the life of the pumping system. Based on the Bingham model of concrete rheology, the paper takes the load characteristics of concrete pumping system as the research object, and based on the theoretical derivation of concrete pipeline load, the rheological characteristics of concrete and the workability of pumping concrete are discussed. The load of concrete pipeline is studied by combining theory with experiment. The paper is divided into seven chapters. The main contents are as follows: in chapter one, the working principle and existing problems of concrete pumping system are introduced, and the influence of concrete workability on the load of concrete pipeline is introduced. This paper introduces the rheological basis of the research on concrete load characteristics, the project source and research significance of this subject. The second chapter introduces the research objectives and research ideas of the subject, and introduces the specific research content of the subject. In the third chapter, the relationship between concrete rheology and workability is analyzed with the help of existing research, and then the influence of concrete mix ratio change on concrete workability and its effect on concrete rheological property are introduced respectively. The fourth chapter introduces the rheological experiment of concrete workability. The concrete with different workability and rheological property is obtained by changing the ratio of concrete. The range of rheological parameters of workability is obtained by testing the workability and rheological parameters of concrete samples. After analyzing the relationship between the ratio and rheological parameters, the optimum mix ratio of concrete based on the workability of concrete is obtained by comparing the range of rheological parameters of workability. To accumulate experience in judging the workability of concrete and provide guarantee for subsequent experiments. In chapter 5, the flow state of concrete in pipeline is analyzed with Bingham model. Firstly, it is determined that concrete is laminar flow in pipeline, and then, according to Bingham model, concrete is determined to be plunger flow in pipeline. Based on the Bingham model, the pressure drop model of concrete pipeline is derived, that is, the load theory model of concrete pipeline. In the sixth chapter, according to the theoretical model of concrete pipeline load, the main factors affecting the load of concrete pipeline are determined. Based on this, the experiment of concrete pipeline load is designed, and the formula of pressure drop of concrete pipeline is fitted according to the pressure drop of concrete pipeline. Based on the analysis of pipeline load characteristics, an improved concrete pipeline load experiment is designed according to the existing research results. The seventh chapter summarizes and prospects the research work of this subject.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU646

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