【作者】 陈阳；

【导师】 陈忠范；

【作者基本信息】 东南大学 ， 土木工程， 2016， 硕士

【摘要】 再生砂浆与再生混凝土是利用废混凝土破碎处理而制成的新型建筑材料,将其推广应用有着深远的意义,不仅保护生态环境,还符合国家可持续发展战略。目前大多数研究集中在再生骨料替代率的影响,再生骨料种类对再生砂浆和混凝土性能的影响仍然比较欠缺,因此,本文主要研究不同来源再生骨料对再生砂浆和再生混凝土基本力学性能的影响。本文通过再生细、粗骨料基本物理性能试验,揭示了再生骨料的特征,结果表明：随着再生骨料原始混凝土抗压强度的提高,再生细骨料以及粗骨料表现出更高的表观密度、更低的吸水率以及更低的压碎指标。使用本试验制得的再生骨料进行再生砂浆与再生混凝土的制配,并研究不同来源的再生骨料对两者工作性能与力学性能的影响,结果表明：再生骨料来源对再生砂浆及混凝土的性质有一定的影响。当再生骨料的原始混凝土强度相近时,其对再生砂浆以及再生混凝土的基本力学性能影响较小；当再生骨料原始混凝土强度不同时,其对再生砂浆及再生混凝土的基本性能影响较大。灌注桩桩头制得的粗骨料性能离散性较大,其制得的再生混凝土基本力学性能同原始强度相近的其它骨料相比较差。根据本研究中再生砂浆、再生混凝土各项试验结果,将力学性能与再生骨料原始混凝土强度的关系进行理论分析,并建立相应的理论公式,包括：抗压强度与原始混凝土强度理论公式、抗拉强度与原始混凝土强度理论公式、混凝土抗压强度与劈拉强度关系模型、单轴受压应力-应变全曲线本构模型,可用于评估再生骨料原始混凝土强度对再生砂浆以及再生混凝土的影响。更多还原

【Abstract】 Recycled mortar and concrete is new building materials made of crushed concrete, and its application in practical engineering has far-reaching significance, not only protect the ecological environment, but also fully in line with national sustainable development strategies. Most research has focused on the influence of the replacement ratio of recycled aggregate, and the research of the influence of the sources of the recycled aggregate is still quite lacking. Therefore, the basic mechanical properties of recycled mortar and concrete with aggregates from different sources are mainly studied.The basic physical performance of recycled coarse and fine aggregate is studied in this paper to reveal the characteristics of recycled aggregate, which is used for mix proportion design. The results show that:as the increase of the compressive strength of original concrete of recycled aggregate, recycled aggregates both fine and coarse show higher apparent density, lower water absorption and lower crush value.Recycled aggregates made during the experiment are used to produce recycled mortar and concrete to study the influence of aggregates from different sources to the workability and the mechanical properties. The results show that:the recycled aggregates have little influence on the basic mechanic properties when their compressive strength of original concrete is similar. On the contrary, the recycled aggregates have considerable influence. However, the dispersion of the property of the aggregate from the top of the drilling pile is greater than the others, and the recycled concrete with the aggregate shows poorer mechanical property which indicates the influence of the aggregate source.According to the experimental results, the theoretical formula are established after analyzing the theoretical relationship between the properties and the original strength of concrete, including:compressive strength-original strength formula, tensile strength-original strength formula, flexural strength-original strength formula and constitutive model of stress-strain curve, which are used for assessing the influence of recycled aggregates to recycled mortar and concrete.更多还原