废弃混凝土再生微粉的活化及功能性研究

发布时间：2017-12-31 17:20

本文关键词：废弃混凝土再生微粉的活化及功能性研究　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以废弃混凝土破碎过程中产生的再生微粉为研究对象,采用机械力化学活化的方法对再生微粉进行处理,激发再生微粉的活性,提高再生微粉的利用率。对再生微粉进行了功能性试验,将TiO2负载在再生微粉表面,制备一种具有光催化功能的微粉。具体内容如下:(1)采用超微气流粉碎机对再生微粉进行粉磨活化,和振动球磨机粉磨活化的再生微粉进行对比。利用激光粒度分析仪、SEM和XRD对再生微粉的粒径分布、表面微观形貌和物相构成等性能进行分析。结果表明:气流粉碎机粉磨活化的再生微粉的粒径分布较集中,粒形较规整,表面的尖锐棱角被钝化,SiO2的无定型化程度高,具有较高的活性。(2)将活化后的再生微粉以一定的比例替代水泥掺入砂浆中,通过砂浆稠度仪、SEM、万能试验机等对砂浆试块的用水量,内部微观形貌和抗压强度进行表征。结果表明:掺加气流粉碎机粉磨的再生微粉的砂浆的用水量比掺加振动球磨机粉磨的再生微粉的砂浆的用水量小,内部更加密实,对砂浆的抗压强度的影响小。(3)选用再生微粉为基体,钛酸四丁酯(C16H36O4Ti)为钛源,无水乙醇、硝酸和去离子水为溶剂,通过溶胶-凝胶法将TiO2负载在再生微粉表面,制成光催化再生微粉。通过SEM、XRD、EDS、FT-IR和紫外可见分光光度计对TiO2/再生微粉的微观形貌、晶体结构、特征官能团和对甲基橙溶液的降解率进行了表征。结果表明:采用溶胶-凝胶法将TiO2成功的负载在再生微粉表面,包覆在再生微粉表面的TiO2为锐钛矿相,TiO2/再生微粉复合颗粒具有较好的光催化降解性能。
[Abstract]:In this paper, the recycled micro-powder produced during the crushing process of waste concrete was studied, and the reclaimed micro-powder was treated by mechanochemical activation method to stimulate the activity of the regenerated micro-powder. The functional test of the regenerated micropowder was carried out, and the TiO2 was loaded on the surface of the regenerated micropowder. A kind of micro powder with photocatalytic function was prepared. The specific contents are as follows: 1) the regenerated micro powder was ground and activated by ultrafine air flow pulverizer. The particle size distribution of the regenerated powder was analyzed by laser particle size analyzer (XRD) and laser particle size analyzer (XRD). The results show that the particle size distribution of the regenerated powder is more concentrated, the shape of the particle is more regular, and the sharp angle of the surface is passivated. SiO2 has a high degree of amorphous, with high activity. 2) the activated regenerated micro-powder is mixed with cement to replace cement in a certain proportion, and the mortar consistency meter is used. The water consumption of mortar test blocks by universal testing machine and so on. The internal microstructure and compressive strength were characterized. The results showed that the water consumption of the regenerated micro-powder mixed with the pneumatic pulverizer was smaller than that of the regenerated micro-powder mixed with the vibratory ball mill. The effect on the compressive strength of mortar is less. 3) the regenerated micro-powder is used as matrix, tetrabutyl titanate C16H36O4Ti) as titanium source, anhydrous ethanol, nitric acid and deionized water as solvent. TiO2 was loaded on the surface of regenerated powder by sol-gel method to produce photocatalytic regenerated powder. Microstructure and crystal structure of TIO _ 2 / regenerated powder by FT-IR and UV-Vis spectrophotometer. The characteristic functional groups and the degradation rate of methyl orange solution were characterized. The results showed that TiO2 was successfully loaded on the surface of regenerated powder by sol-gel method. The TiO2 particles coated on the surface of the regenerated micropowder have good photocatalytic degradation performance as anatase phase TIO _ 2 / regenerated micro-powder composite particles.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X799.1

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