王鹏-粉煤灰在混凝土中的应用及作用机理研究进展.pdf

粉煤灰在混凝土中的 应用及作用机理研究进展 班级：材料应用901 姓名：王鹏 指导老师：李国新 摘要 粉煤灰是从煤粉炉排出的烟气中收集到的细颗粒粉末，是工业 “三废”之 一。合理地推广和应用粉煤灰不仅能节约土地和能源，而且能保护和治理环境。 粉煤灰作为一种人工火山灰质材料，在混凝土中作为掺和料，可以改善其性能， 节约水泥，提高工程质量和降低成本。本文主要介绍了粉煤灰组成；粉煤灰在 混凝土中的作用以及三种作用机理：形态效应、活性效应、微集料效应；粉煤 灰在混凝土中时水胶比和温度的影响；粉煤灰对混凝土性能的影响，其中包括 对混凝土和易性、力学性能、抗渗性和抗冻性的影响；最后讲到大掺量粉煤灰 混凝土应该注意的事项，因为任何事物都有两面性，超过了一定的比例就物 极必反。但总体来说，粉煤灰混凝土是一种绿色混凝土，它的推广和应用在 我国土木建筑工程中必定有强大的生命力和有广阔的发展前景。 关键词：粉煤灰，混凝土，应用，作用机理 Abstract Fly ash is a fine-grained powder collected in the flue gas emitted from the pulverized coal, is one of the industrial three wastes”. Reasonable popularized and applied not only to be able to save the land and fly ash energy, but can control and protection of the environment. Fly ash as a kind of artificial pozzolana materials, in the concrete were as material, can improve the performance, save the cement, improving engineering quality andreducethe cost.This article mainly introducedthe 第1页 共 16页 fly ash iscomposed;Theroleoffly ash in concreteandthreemechanism:form effect, activity effect, micro aggregate effect; Fly ash in concrete hitting water-binder ratio and the influence of the temperature of; Fly ash on the influence of the concrete performance, including the concrete workability, mechanical properties, penetration-proof quality and the influence ofthe frost resistance; The last torefer to the big doping fly ash concrete should pay attention to matters, because any every coin hastwosides,morethan acertain proportion istheworst will mend.But overall, fly ash concrete is a kind of green concrete; its application in our countrys civil building engineering must have a strong vitality and have wide development prospects. Keyword：Fly ash，concrete，application，mechanism ofaction