钛矿渣免烧轻质陶粒的制备及其性能研究

发布时间：2018-02-22 09:49

  本文关键词： 钛矿渣 碱激发 免烧陶粒 轻集料混凝土　出处：《西南科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国攀西地区高钛型高炉矿渣排放量和堆存量巨大,但其Ti O2及相应的低活性晶体矿物含量高,导致水化活性偏低,直接用于水泥生产或混凝土制备将影响产品的力学性能。本文提出以高钛矿渣为主要原料,采用碱激发技术制备碱激发钛矿渣(AATS)和钛矿渣免烧轻质陶粒。研究了激发剂、水胶比、养护温度以及养护时间对AATS胶凝基体性能影响;选择合适配比的AATS胶凝基体粘结剂,以双氧水和铝粉为室温引气剂,通过圆盘造粒,制备了碱激发钛矿渣免烧轻质陶粒(SLWA);最后以SLWA为轻集料,制备了轻集料混凝土,并研究了相关性能。研究结果表明:水玻璃作为激发剂对钛矿渣激发效果良好,室温条件下,水玻璃掺量越大,水胶比越低,碱激发钛矿渣胶凝基体强度越高;90℃蒸汽养护12h可进一步提高碱激发钛矿渣胶凝基体强度。以铝粉和双氧水为引气剂,采用圆盘造粒,可制得700、800和900密度等级的陶粒。铝粉引气工艺简单,容易操作,制得陶粒堆积密度小,但内部通孔结构较多、吸水率大;双氧水引气易受环境条件影响,引气过程对工艺和操作要求更高,但制得的陶粒表面更光滑致密、内部孔结构均匀、通孔结构少、吸水率低,各项性能优于铝粉引气制备的陶粒。铝粉和双氧水复合引气,工艺与铝粉引气工艺相似,容易操作,制得的陶粒各项性能都优于两者单独引气制备的陶粒。选择筒压强度较高的800密度等级陶粒为轻集料,分别配制出容重1700 kg/m3、1800kg/m3的轻集料混凝土,发现轻集料混凝土界面过渡区与普通骨料混凝土界面过渡区存在一定差异。
[Abstract]:In Panxi area of China, the slag discharge and heap stock of high titanium blast furnace are huge, but the content of TIO 2 and the corresponding low active crystal minerals are high, which results in low hydration activity. Direct use in cement production or concrete preparation will affect the mechanical properties of the product. In this paper, the alkali activated titanium slag (AATS) and the titanium slag without burning light ceramic particles are prepared by alkali excitation technique using high titanium slag as the main raw material. The effects of water / binder ratio, curing temperature and curing time on the properties of AATS cementing matrix were studied, and the suitable binder of AATS cementing matrix was selected, and hydrogen peroxide and aluminum powder were used as room temperature entrainer, and then granulated on disk, Light-weight aggregate concrete was prepared with SLWA as light aggregate and alkali activated titanium slag was prepared. The results show that sodium silicate as activator can excite titanium slag well at room temperature. The higher the water glass content, the lower the water-binder ratio, the higher the strength of alkali stimulated titanium slag cementitious matrix is, the higher the strength of cementing matrix is when steam curing at 90 鈩，

本文编号：1524113