低强度流动性建筑垃圾回填材料基本性能研究

发布时间：2018-04-16 18:56

本文选题：再生回填材料 + 分级方法　；参考：《北京工业大学》2014年硕士论文

【摘要】：针对城市建筑垃圾日益增多造成环境的严重污染，以及国家对于建筑材料提倡可持续发展的战略方针，以建筑垃圾再生细料为主要原材料，掺加水泥、矿物掺合料和水制备出一种新型的回填材料低强度流动性建筑垃圾回填材料。再生回填材料具有自密实、低强度的特点，同时其强度还可以进行调节。所使用的主要原材料为建筑垃圾再生材料，在环境保护和工程应用中都具有重要意义。为深化对建筑垃圾再生细料的规范化应用，通过对建筑垃圾再生细料的品质进行实验探讨，确定了对建筑垃圾再生细料的分级方法。在对低强度流动性建筑垃圾回填材料工作性能（包括流动度和泌水率）研究的基础上，以水固比和灰砂比为配合比设计参数，提出了低强度流动性建筑垃圾回填材料的配合比设计方法。其次，分别对水固比和灰砂比设定四个水平，对低强度流动性建筑垃圾回填材料的基本力学性能进行室内实验研究，主要包括抗压强度试验、CBR承载力试验和应力－应变试验。其中对抗压强度进行了重点分析，，得出强度随期龄、水固比、灰砂比、原材料变化的发展规律，并提出了以水固比和灰砂比为设计参数的强度预测模型，同时对应力应变机理做了初步的探讨，提出了应力应变全曲线的四个典型阶段。最后，开展了不同配合比低强度流动性建筑垃圾回填材料的耐久性能试验研究，包括抗干湿循环试验和抗冻融循环试验。结果表明，干湿循环可以提高其抗压强度，冻融循环中随强度的提高其抵御冻融循环的能力不断提高。
[Abstract]:In view of the serious environmental pollution caused by the increasing number of urban construction wastes and the national strategic policy of promoting the sustainable development of building materials, the recycled fine materials of construction waste are used as the main raw materials and cement is added.A new backfill material with low strength and fluidity was prepared by mineral admixture and water.The recycled backfill material has the characteristics of self-compacting and low strength, and its strength can also be adjusted.The main raw material used is construction waste recycling material, which is of great significance in environmental protection and engineering application.In order to deepen the standardized application of construction waste recycled fine materials, the classification method of construction waste recycled fine materials was determined through the experimental discussion on the quality of construction waste recycled fine materials.Based on the study of the working performance (including fluidity and bleeding rate) of low strength and fluidity construction waste backfill materials, the ratio of water to solid and the ratio of ash to sand are taken as the design parameters.The design method of mix ratio of low strength mobile construction waste backfill material is put forward.Secondly, four levels of water-solid ratio and lime-sand ratio are set, and the basic mechanical properties of low-strength and fluidity construction waste backfill materials are studied in laboratory, including compressive strength test, CBR bearing capacity test and stress-strain test.The compressive strength is analyzed emphatically, and the development law of strength with age, water / solid ratio, ratio of lime to sand, raw material change is obtained, and the strength prediction model with water / solid ratio and ash / sand ratio as design parameters is put forward.At the same time, the mechanism of stress-strain is discussed, and four typical stages of stress-strain curve are put forward.Finally, the durability tests of low strength and low strength fluidity building waste backfill materials with different mixing ratios were carried out, including dry and wet cycle tests and freeze-thaw resistance tests.The results show that dry-wet cycle can improve its compressive strength, and its ability to resist freeze-thaw cycle is improved with the increase of the strength of freeze-thaw cycle.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】