高强复合陶粒的制备及轻骨料混凝土氯离子渗透性能的研究
发布时间:2018-06-03 16:04
本文选题:粉煤灰 + 废玻璃 ; 参考:《大连理工大学》2013年硕士论文
【摘要】:我国是世界上粉煤灰产量最大的国家之一,虽然近年来我国对粉煤灰的综合利用进行了大量的开发和研究,但目前对于粉煤灰的总体利用率并不高,尤其是低等级粉煤灰的利用率更低。同时,我国玻璃及其制品的用量也逐年增大,不可避免的产生了大量的废玻璃,对环境的负荷也逐年增加。因此,科学合理的利用粉煤灰和废玻璃等固体废弃物,对于提高相关行业的经济效益和保护自然环境均具有十分重要的意义。 本文以低等级粉煤灰和废玻璃为主要原料,辅以粘结剂和造孔剂等外加剂烧制高强复合陶粒。通过大量的基础试验和正交试验确定了烧制高强复合陶粒的最佳配方及最佳烧制参数,即粉煤灰:废玻璃:粘结剂:造孔剂=56:24::8:12,干燥温度:110℃,干燥时间:24h;预热温度:600℃,预热时间:20min;焙烧温度:1140℃,焙烧时间:30min。 同时,全面分析了原料、外加剂以及烧制参数对高强复合陶粒性能的影响以及陶粒孔隙形成的机理。通过XRD和SEM分析,可以发现焙烧粉煤灰和废玻璃的过程中产生了大量影响陶粒强度的非晶态凝胶相,内部产生了大量的气孔。 利用自制的高强复合陶粒,采用绝对体积法进行了轻骨料混凝土的配合比设计。在水灰比为0.40,砂率为40%的情况下,配制的混凝土的28d抗压强度为47.5MPa,干表观密度为1878Kg/m3,达到LC40轻骨料混凝土的要求。 通过RCM法和ASTM C1202快速试验方法,比较了同强度等级下轻骨料混凝士和普通混凝土的抗氯离子渗透性能,并研究了骨料、预湿程度以及掺合料对高强复合陶粒混凝土抗氯离子渗透性能的影响。试验表明,同强度等级下,轻骨料混凝土比普通混凝土具有更好的抗氯离子渗透性能;在陶粒混凝土的配制过程加入一定量的粉煤灰能够有效的改善其抗渗性;预湿对轻骨料混凝土的抗渗性会产生不利影响。
[Abstract]:China is one of the countries with the largest output of fly ash in the world. Although the comprehensive utilization of fly ash has been extensively developed and studied in China in recent years, the overall utilization ratio of fly ash is not high at present. In particular, the utilization ratio of low grade fly ash is lower. At the same time, the amount of glass and its products in China is increasing year by year, which inevitably produces a large amount of waste glass, and the load on the environment is also increasing year by year. Therefore, the scientific and rational use of solid wastes such as fly ash and waste glass is of great significance for improving the economic benefits of related industries and protecting the natural environment. In this paper, high strength composite ceramsite is made from low grade fly ash and waste glass with additives such as binder and pore-making agent. Through a large number of basic experiments and orthogonal experiments, the optimum formula and optimum sintering parameters of fired high-strength composite ceramsite were determined, that is, fly ash: waste glass: binder: pore-making agent 56: 24: 8: 12, drying temperature: 110 鈩,
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