发泡玄武岩废料作为再生骨料的混凝土性能研究

发布时间：2018-05-01 05:18

本文选题：发泡玄武岩废料 + 再生骨料　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：随着城镇化进程的加速,建筑垃圾日益增多,能源短缺和环境污染问题日益突出。节能工作已成为可持续发展的重要保证。将废弃的发泡玄武岩边角料作为再生轻骨料,部分或全部替代混凝土传统矿料,将是解决发泡玄武岩废料的有效途径。本文以发泡玄武岩边角废料为研究重点,对其骨料进行品质评价,将其作为骨料应用在轻骨料混凝土和普通混凝土中,研究其混凝土各方面的性能,旨在为推广应用发泡玄武岩混凝土提供技术支持,为节能墙体的发展和应用提供理论支持。具体研究工作如下:(1)开展了对发泡玄武岩骨料的品质评价,对比了发泡玄武岩骨料和页岩陶粒之间的表观密度、吸水率、含水率、筒压强度等指标,得出了发泡玄武岩轻骨料的基本性能;(2)以发泡玄武岩骨料取代率为参数,对390个轻骨料混凝土试件开展了力学性能、收缩性能、抗冻性能以及热工性能试验。测试了混凝土立方体抗压强度、劈裂抗拉强度、抗折强度,观察了试件的破坏形态,得出了发泡玄武岩骨料的最优掺量范围,分析了影响混凝土强度的因素;测试了收缩率随时间的变化规律,分析了影响收缩的因素;采用了掺引气剂和裹浆处理的方法,对轻骨料混凝土的抗冻性能进行了研究,提出了改善轻骨料混凝土抗冻性能的方法;测试了混凝土板的导热系数值,分析了导热系数与发泡玄武岩骨料取代率的关系,得到了最佳的发泡玄武岩骨料取代率值;通过扫描电镜试验,得到了轻骨料混凝土骨料内部形貌以及粗骨料—水泥石的界面区情况;(3)以发泡玄武岩细骨料取代率为参数,对75个普通混凝土试件完成了力学性能试验,得出了最佳的发泡玄武岩细骨料取代率值;分析了各组试件单轴受压应力-应变全曲线,探讨了弹性模量、峰值应力、峰值应变、极限应变的变化规律;采用多项式拟合的方法分别给出了应力-应变全曲线上升段和下降段参数的变化规律,建立了单轴受压单调荷载本构模型;对掺发泡玄武岩骨料的混凝土在实际工程中的应用给出了建议。
[Abstract]:With the acceleration of urbanization, construction waste is increasing, energy shortage and environmental pollution are becoming more and more serious. Energy conservation has become an important guarantee of sustainable development. It is an effective way to solve foaming basalt waste by using waste foaming basalt scrap as regenerated lightweight aggregate and replacing part or all of traditional concrete mineral material. In this paper, the quality of foamed basalt scrap is evaluated and used as aggregate in light aggregate concrete and ordinary concrete to study the properties of its concrete. The aim is to provide technical support for the popularization and application of foamed basalt concrete and theoretical support for the development and application of energy-saving wall. The concrete research work is as follows: (1) the quality evaluation of foamed basalt aggregates is carried out, and the apparent density, water absorption, water content, tube compressive strength and so on between foamed basalt aggregate and shale ceramsite are compared. The basic properties of foamed basalt lightweight aggregate are obtained. Based on the substitution rate of foamed basalt aggregate, the mechanical properties, shrinkage properties, freezing resistance and thermal properties of 390 lightweight aggregate concrete specimens are tested. The cube compressive strength, splitting tensile strength and flexural strength of concrete are tested, the failure patterns of the specimens are observed, the optimum range of the content of foam basalt aggregate is obtained, and the factors affecting the strength of concrete are analyzed. The variation law of shrinkage rate with time was tested, and the factors affecting shrinkage were analyzed, and the frost resistance of lightweight aggregate concrete was studied by using air entraining agent and slurry wrapping method. The method of improving the frost resistance of lightweight aggregate concrete is put forward, the thermal conductivity of concrete slab is tested, the relationship between heat conductivity and the substitution rate of foamed basalt aggregate is analyzed, and the best value of substitution rate of foamed basalt aggregate is obtained. By SEM test, the internal morphology of lightweight aggregate concrete aggregate and the interface between coarse aggregate and cement stone were obtained. The mechanical properties of 75 ordinary concrete specimens were tested with foam basalt fine aggregate substitution rate as parameters. The optimum value of substitution rate of fine aggregate in foaming basalt is obtained, the full stress-strain curve of uniaxial compression is analyzed, and the variation rules of elastic modulus, peak stress, peak strain and limit strain are discussed. By means of polynomial fitting, the variation laws of the parameters in the ascending and descending sections of the stress-strain full curve are given, and the constitutive model of the monotone load under uniaxial compression is established. The application of concrete mixed with foamed basalt aggregate in practical engineering is suggested.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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