橡胶集料混凝土橡胶颗粒上浮试验研究
发布时间：2018-08-13 14:41
【摘要】：橡胶集料混凝土于二十多年前诞生在美国,它是一种新型建筑材料,它的出现极大地推动了混凝土技术的进步,也是应对日益严峻的废弃轮胎处理、环境保护问题、实现资料回收利用的一个新途径。橡胶集料混凝土拥有一系列优异的工程性能,例如延性大、抗开裂性能优异、阻尼比大、耐久性能好等特点,这些突出的性能正吸引科研工作者持续增长的关注。然而,橡胶集料混凝土也存在一些突出的缺点,例如强度降低、造价高、易于发生橡胶集料上浮等问题。橡胶集料混凝土的这些缺点限制了它的广泛使用以及推广。本文首次以橡胶集料混凝土上浮问题作为试验研究对象,设计了一套全新的试验方法,研究影响橡胶集料混凝土橡胶颗粒上浮的几个因素,并针对橡胶集料混凝土上浮问题提出具体控制措施,以指导实际工程应用。本文主要采用试验研究的方法进行。主要包括基本力学性能试验(立方体抗压强度试验),密度测定试验,橡胶颗粒沿棱柱体试件高度方向分布测定试验。本文基于学者的研究成果,制作了不同配合比情况下的橡胶集料混凝土棱柱体试件,试件均采用100mm×100mm×300mm的棱柱体。通过切割棱柱体试件得到立方体试件以及纵断面棱柱体试件,并通过立方体试件的抗压强度和密度以及纵断面棱柱体试件的橡胶颗粒分布情况研究橡胶集料混凝土上浮现象。本文得到的主要研究成果如下:1.当混凝土坍落度较小(小于5cm)时,上浮现象不明显。但是当橡胶集料混凝土坍落度较大(大于14.5cm)并持续增大时,上浮现象加剧发展。当坍落度突破某一值(约18cm)时,上浮现象突然变得非常严重。2.在坍落度较大(大于14.5cm)的基础上,30s时间内,当振捣时间增加时,上浮现象更加明显。3.一定范围内,提高砂率对控制上浮现象有利。此外,本文还通过建立并求解微分方程,对影响橡胶颗粒上浮的因素做了理论分析。另外,本文还探讨了普通混凝土的分层离析控制理论,提出了控制普通混凝土分层离析的具体措施。这些探讨和分析对控制橡胶集料混凝土上浮现象大有帮助。本文在最后对控制橡胶上浮给出了一些建议措施,以指导实际工程建设。
[Abstract]:Rubber aggregate concrete was born in the United States more than 20 years ago. It is a new type of building material. Its emergence has greatly promoted the progress of concrete technology, and is also dealing with the increasingly serious problems of waste tire disposal and environmental protection. A new way to realize data recycling. Rubber aggregate concrete has a series of excellent engineering properties, such as large ductility, excellent cracking resistance, large damping ratio, good durability and so on. These outstanding properties are attracting the attention of researchers. However, rubber aggregate concrete also has some outstanding disadvantages, such as low strength, high cost and easy to float rubber aggregate. These disadvantages of rubber aggregate concrete limit its wide use and popularization. In this paper, for the first time, the problem of rubber aggregate concrete floatation is taken as the experimental research object, and a new test method is designed to study several factors that affect the rubber particle floating of rubber aggregate concrete. In order to guide the practical engineering application, the concrete control measures are put forward to solve the floating problem of rubber aggregate concrete. This paper mainly adopts the method of experimental research. It mainly includes basic mechanical property test (cube compressive strength test), density test and rubber particle distribution test along the height of the prism specimen. Based on the research results of the scholars, the rubber aggregate concrete prism specimens with different mix ratios are made, all of which are made of 100mm 脳 100mm 脳 300mm prisms. The cube specimen and the longitudinal section prism specimen were obtained by cutting the prism specimen, and the floating phenomenon of rubber aggregate concrete was studied through the compressive strength and density of the cube specimen and the rubber particle distribution of the longitudinal prism specimen. The main research results obtained in this paper are as follows: 1. When the slump of concrete is smaller (less than 5cm), the floating phenomenon is not obvious. However, when the slump of rubber aggregate concrete is larger than 14.5cm and continues to increase, the phenomenon of floatation intensifies. When the slump exceeds a certain value (about 18cm), the floating phenomenon suddenly becomes very serious. On the basis of the larger slump (larger than 14.5cm), when the vibrational time increases, the floating phenomenon is more obvious in 30s. To a certain extent, it is beneficial to control the floating phenomenon by increasing the sand rate. In addition, by establishing and solving differential equations, the factors affecting rubber particle floating are analyzed theoretically. In addition, this paper also discusses the theory of stratified segregation control of ordinary concrete, and puts forward the concrete measures to control the stratified segregation of ordinary concrete. The discussion and analysis are helpful to control the floating phenomenon of rubber aggregate concrete. At the end of this paper, some advices are given to control rubber floatation in order to guide practical engineering construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
[Abstract]:Rubber aggregate concrete was born in the United States more than 20 years ago. It is a new type of building material. Its emergence has greatly promoted the progress of concrete technology, and is also dealing with the increasingly serious problems of waste tire disposal and environmental protection. A new way to realize data recycling. Rubber aggregate concrete has a series of excellent engineering properties, such as large ductility, excellent cracking resistance, large damping ratio, good durability and so on. These outstanding properties are attracting the attention of researchers. However, rubber aggregate concrete also has some outstanding disadvantages, such as low strength, high cost and easy to float rubber aggregate. These disadvantages of rubber aggregate concrete limit its wide use and popularization. In this paper, for the first time, the problem of rubber aggregate concrete floatation is taken as the experimental research object, and a new test method is designed to study several factors that affect the rubber particle floating of rubber aggregate concrete. In order to guide the practical engineering application, the concrete control measures are put forward to solve the floating problem of rubber aggregate concrete. This paper mainly adopts the method of experimental research. It mainly includes basic mechanical property test (cube compressive strength test), density test and rubber particle distribution test along the height of the prism specimen. Based on the research results of the scholars, the rubber aggregate concrete prism specimens with different mix ratios are made, all of which are made of 100mm 脳 100mm 脳 300mm prisms. The cube specimen and the longitudinal section prism specimen were obtained by cutting the prism specimen, and the floating phenomenon of rubber aggregate concrete was studied through the compressive strength and density of the cube specimen and the rubber particle distribution of the longitudinal prism specimen. The main research results obtained in this paper are as follows: 1. When the slump of concrete is smaller (less than 5cm), the floating phenomenon is not obvious. However, when the slump of rubber aggregate concrete is larger than 14.5cm and continues to increase, the phenomenon of floatation intensifies. When the slump exceeds a certain value (about 18cm), the floating phenomenon suddenly becomes very serious. On the basis of the larger slump (larger than 14.5cm), when the vibrational time increases, the floating phenomenon is more obvious in 30s. To a certain extent, it is beneficial to control the floating phenomenon by increasing the sand rate. In addition, by establishing and solving differential equations, the factors affecting rubber particle floating are analyzed theoretically. In addition, this paper also discusses the theory of stratified segregation control of ordinary concrete, and puts forward the concrete measures to control the stratified segregation of ordinary concrete. The discussion and analysis are helpful to control the floating phenomenon of rubber aggregate concrete. At the end of this paper, some advices are given to control rubber floatation in order to guide practical engineering construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
【参考文献】
相关期刊论文 前6条
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2 朱涵;刘春生;张永明;李志国;;橡胶集料掺量对混凝土压弯性能的影响[J];天津大学学报;2007年07期
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