基于分形理论的废玻璃粉胶砂性能的研究

发布时间：2018-06-10 16:45

本文选题：废玻璃 + 辅助胶凝材料　；参考：《南华大学》2015年硕士论文

【摘要】：随着经济的快速发展,废玻璃垃圾日益增多,除部分被回收重新制成玻璃外,大部分被作掩埋处理,严重污染生态环境。将废玻璃掺入水泥基拌合物中,运用到建筑上成为当今热门话题。将废玻璃粉掺入水泥基拌合物中,不仅节约了有限的建筑资源,而且开辟了废玻璃回收利用的新途径,符合国家节能减排政策。传统上对废玻璃粉的研究主要侧重细度方面,其细度表征的内容主要包括比表面积、颗粒大小、平均粒度与颗粒分布等方面。废玻璃粉颗粒是一种人工颗粒,具有高比表面积与多分散性两大特征,其细度表征即为颗粒的粒度表征,是以废玻璃粉群体颗粒为对象,表示所有颗粒大小的总体概念。但随着研究的不断深入一定粒径下的筛余量与比表面积,无法精细反映废玻璃粉的真实级配分布特征与细度特点,与其活性建立的相关性往往也不太精确,采用分形理论可以克服这一弱点,不同分形维数的废玻璃粉有不同的细度模数与活性指数,不同碾磨时间废玻璃粉的细观、微观的定量化指标由分形维数表达可与废玻璃粉的活性指数准确联系起来,进而从一个新的角度阐释废玻璃粉的性能,对其运用到建筑材料中有积极意义。本文主要将废玻璃粉作为辅助胶凝材料掺入胶砂中,研究其拌合物的和易性与力学性,为其运用到实践工程上作理论指导。为研究不同粒径废玻璃粉对胶砂流动性、抗折抗压性能的影响,将无色废玻璃碾磨并筛分为38-53μm、53-75μm、75-150μm、150-300μm、300-600μm五种粉末状态,作为辅助胶凝材料以内掺法分别替代胶砂中水泥5%、10%、15%、20%、25%、30%的用量,对照组分为无减水剂与含减水剂两组,同时每组均加粉煤灰、硅灰作对比,测量拌合物扩展度以及28天的抗折抗压强度。结果表明,当废玻璃粉粒径小于75μm同时掺量在10-15%时,对提高胶砂流动性较佳;当水用量不变掺入减水剂时,抑制胶砂强度;无论是否掺入减水剂,废玻璃粉在胶砂中最佳粒径与掺量几乎相同;无论是否掺入减水剂,当废玻璃粉粒径为38-53μm同时掺量为5-15%时,其胶砂试件28天抗折抗压强度最佳且与基准组相差无几。
[Abstract]:With the rapid development of economy, the waste glass garbage is increasing day by day, except for some recycled glass, most of them are buried, which pollutes the ecological environment seriously. It is a hot topic to add waste glass into cement-based mixture and apply it to architecture. Mixing waste glass powder into cement based mixture not only saves limited construction resources, but also opens up a new way of recycling waste glass, which is in line with the national policy of energy saving and emission reduction. Traditionally, the research on waste glass powder mainly focuses on fineness, the content of fineness characterization mainly includes specific surface area, particle size, average particle size and particle distribution. The waste glass powder is a kind of artificial particle, which has two characteristics: high specific surface area and polydispersity. Its fineness is the particle size representation, and it is a general concept that takes the waste glass powder population particle as the object and represents the size of all the particles. However, with the further study of the sieve allowance and specific surface area under a certain particle size, the true gradation and fineness characteristics of waste glass powder can not be accurately reflected, and the correlation with its activity is often not very accurate. Fractal theory can overcome this weakness. Different fractal dimensions of waste glass powder have different fineness modulus and activity index, and different grinding time of waste glass powder. The quantitative index expressed by fractal dimension can be accurately related to the activity index of waste glass powder, and then the performance of waste glass powder can be explained from a new angle, which has a positive significance for its application to building materials. In this paper, waste glass powder is mainly mixed into cement sand as auxiliary cementing material to study its mixing properties and mechanical properties, and to make theoretical guidance for its application in practical engineering. In order to study the effect of waste glass powder of different particle size on the flowability and flexural compressive properties of cement sand, the colorless waste glass was milled and sifted to 38-53 渭 m ~ 53-75 渭 m ~ 75-150 渭 m ~ 150-300 渭 m ~ 300-600 渭 m, which was used as an auxiliary cementing material to replace the dosage of 51010 ~ 1520 ~ 1520 ~ 2520% cement in cementing sand respectively. The control group was divided into two groups: no water reducing agent and water reducing agent group. At the same time, fly ash and silica fume were added to each group for comparison. The extensibility of the mixture and the compressive strength of 28 days were measured. The results show that when the particle size of waste glass powder is less than 75 渭 m and the amount of waste glass powder is 10-15%, the fluidity of cement sand is better, and the strength of cement sand is inhibited when the amount of water is not changed, whether or not water reducer is added, The optimum particle size and content of waste glass powder in cement sand are almost the same, and when the particle size of waste glass powder is 38-53 渭 m and the content of waste glass powder is 5-15%, whether or not the waste glass powder is mixed with water reducing agent, the best flexural compressive strength of the mortar specimen in 28 days is the best and is no different from that of the reference group.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

【参考文献】