建筑垃圾再生骨料混凝土砌块配合比及其砌体基本力学性能研究

发布时间：2018-03-08 02:16

本文选题：再生骨料混凝土　切入点：再生混凝土空心砌块　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国城市化进程的加快，建筑业得到了快速发展，与此同时产生大量的建筑垃圾。将这些建筑垃圾经过加工处理制成再生骨料混凝土空心砌块符合可持续发展的六大原则，有良好的经济和环保效益。然而，再生混凝土空心砌块是一种新型墙体材料，需要建立一个完善的理论体系，才能真正地在实际工程中被大力的推广应用。本文通过对再生骨料混凝土砌块配合比及其砌体基本力学性能的试验研究与理论分析，为再生混凝土空心砌块在实际工程中的广泛应用提供了理论依据及建议。本文基于自由水灰比的设计思想，设计了27组不同配合比的再生骨料混凝土，并按照现行规范对再生骨料混凝土立方体抗压强度进行了测试，分析了抗压强度与粗细骨料取代率、水灰比的关系；此外，拟合出了以粗、细骨料替代率和水灰比为参数的再生混凝土配合比公式，给出了不同强度等级再生混凝土的配合比表。通过对28组再生骨料混凝土砌块砌体的试件进行受压性能试验，研究了砌体的破坏特征、受压强度、应力-应变曲线关系、弹性模量和泊松比，分析了砂浆强度和砌块强度对砌体受压性能的影响。结果表明：砌体抗压强度主要受砌块强度的影响，当砌块强度等级增高一级时，砌体的抗压强度提高了约55%；砂浆强度的提高会导致砌体抗压强度的增大，但是收益有限。经试验研究分析，再生骨料混凝土砌块砌体抗压强度的设计值可按《砌体结构设计规范》中提供的普通混凝土砌块砌体强度设计值进行取值。通过对40组再生骨料混凝土砌块砌体的抗剪性能试验，研究了抗剪砌体的破坏形态与抗剪强度，分析砂浆强度对砌体的抗剪强度的影响。结果表明：再生骨料混凝土砌块砌体与普通混凝土砌块砌体有着相近的受剪性能。砂浆强度是砌体抗剪强度最重要的影响因素，，随着砂浆强度的增大而增长；当砂浆强度提高一个级别时，实测的砌体抗剪强度将增加8.7%。实测的再生骨料混凝土砌块砌体的抗剪强度值要小于规范公式计算的理论值，经分析给出砌体的抗剪强度均值的修正公式。
[Abstract]:With the acceleration of urbanization in our country, the construction industry has been developing rapidly, and at the same time, a large amount of construction waste has been produced. The construction waste is processed and processed into recycled aggregate concrete hollow block, which conforms to the six principles of sustainable development. Have good economic and environmental benefits. However, recycled concrete hollow block is a new type of wall material, need to establish a sound theoretical system, In order to be popularized and applied in practical engineering, this paper studies and analyses the basic mechanical properties of recycled aggregate concrete block by means of experimental research and theoretical analysis. The theoretical basis and suggestions are provided for the wide application of recycled concrete hollow block in practical engineering. Based on the design idea of free water-cement ratio, 27 groups of recycled aggregate concrete with different mix ratio were designed, and the cube compressive strength of recycled aggregate concrete was tested according to the current code. The relationship between compressive strength and replacement rate of coarse aggregate and water-cement ratio is analyzed, in addition, the formula of mix ratio of recycled concrete with coarse, fine aggregate substitution rate and water-cement ratio as parameters is fitted. The proportion table of recycled concrete with different strength grades is given. Based on the compressive tests of 28 groups of recycled aggregate concrete block masonry specimens, the failure characteristics, compressive strength, stress-strain curve, elastic modulus and Poisson's ratio of the masonry are studied. The effects of mortar strength and block strength on the compressive properties of masonry are analyzed. The results show that the compressive strength of masonry is mainly affected by the strength of masonry blocks, and when the strength grade of masonry blocks increases by one level, The compressive strength of masonry has been increased by about 55. The increase of mortar strength will lead to the increase of masonry compressive strength, but the benefit is limited. The design value of compressive strength of recycled aggregate concrete block masonry can be obtained according to the design value of ordinary concrete block masonry strength provided in the Code for masonry structure Design. Based on the tests of 40 groups of recycled aggregate concrete block masonry, the failure mode and shear strength of shear-resistant masonry are studied. The influence of mortar strength on the shear strength of masonry is analyzed. The results show that recycled aggregate concrete block masonry has similar shear performance to ordinary concrete block masonry, and mortar strength is the most important influencing factor of masonry shear strength. With the increase of mortar strength, when mortar strength increases by one grade, the measured shear strength of masonry will increase by 8.7%. The measured shear strength of recycled aggregate concrete block masonry is smaller than the theoretical value calculated by the standard formula. The revised formula of the mean value of shear strength of masonry is given through analysis.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU522.3

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