【作者】 应姗姗；

【导师】 樊先平； 钱晓倩；

【作者基本信息】 浙江大学 ， 材料物理与化学， 2014， 博士

【摘要】 在当今的建筑业中,利废节能、保护环境越来越成为人们关注的焦点。蒸压加气混凝土集轻质、保温、吸声、隔热等优点为一体,同时能利用尾矿等工业废弃物,作为一种新型墙体材料得到了重点推广和应用。然而,蒸压加气混凝土本身特有的多孔结构使其存在强度较低,干燥收缩率高等问题,导致墙体出现裂缝、保温性能下降,不利于这种墙体材料的进一步推广。针对这一情况,本文采用在蒸压加气混凝土中掺入纳米碳酸钙的方法对其性能进行改良,同时研究开发了一种利用陶瓷工业废弃物替代石英砂制备的高铝质蒸压加气混凝土,并对其力学性能、耐久性和微观结构进行了全面的试验研究,从而促进了蒸压加气混凝土的进一步推广应用。首先在蒸压加气混凝土中掺入纳米碳酸钙,对不同纳米碳酸钙掺量下蒸压加气混凝土的抗压强度和干燥收缩特性的变化情况进行了研究,同时采用X射线衍射分析(XRD)和扫描电子显微镜(SEM)两种测试手段考察蒸压加气混凝土的矿物组成和微观结构,并在此基础上确定了纳米碳酸钙的最佳掺量,对提高蒸压加气混凝土的性能提供了一条可行的途径。其次在蒸压加气混凝土中使用陶瓷废弃物替代部分石英砂,研究不同替代比例下蒸压加气混凝土的力学性能、耐久性和干燥收缩性能的变化,同时对蒸压加气混凝土的矿物组成和微观结构进行研究,分析了陶瓷废弃物对蒸压加气混凝土的作用机理,在此基础上确定了陶瓷废弃物的最佳替代量,提供了一种制备高铝质加气混凝土的方式,同时也提供了一条合理利用陶瓷工业废弃物、节约土地、保护环境的途径。更多还原

【Abstract】 As environmental compatibility and sustainability becoming increasingly important issues in the construction industry, autoclaved aerated concrete (AAC), which can reuse industry wastes adequately, as a kind of lightweight, high-strength and insulating material, received wide attention again. However, due to unique cell structure and absorbing water property of AAC, many problems have emerged, such as low strength and high dry shrinkage etc. These problems seriously affect the visual impression and utilization and make against the further development of these materials. Aiming at this circumstance, nano calcium carbonate was adopted into AAC in this paper so as to improve the properties of AAC, in the same time, ceramic industry wastes was used to replace quartz sand to produce high aluminum AAC, its mechanical property, durability and microstructure were studied.First, the influences of nano calcium carbonate with different content to the mechanical property and dry shrinkage of AAC were studied. The composition and microstructure of AAC is characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). On this basis, the best content of nano calcium was determined.Second, ceramic wastes was used to replace quartz sand in AAC, and the influences of ceramic wastes with different content to the mechanical properties, durability and dry shrinkage were studied. The composition and microstructure of AAC are characterized by XRD and SEM. On this basis, the best content of ceramic wastes was determined, not only provides a method to prepare high aluminum AAC, but also provides a way to reuse ceramic wastes, conserve land and protect the environment.更多还原