掺合建筑垃圾微粉混凝土的性能研究

针对建筑垃圾微粉的资源化处理,将粒径小于0.16mm的建筑垃圾微粉作为混凝土的掺合料,按照0%、5%、10%、15%、20%的比例取代水泥制作混凝土,对其进行抗压强度、抗折强度、抗渗性、淡水冻融循环、人工海水冻融循环试验来对其作为掺合料的对混凝土性能影响进行研究。研究表明:随着微粉掺加比例的增加,混凝土强度降低;在5组微粉掺量不同的试验组中,掺加比例为5%时的混凝土抗折、抗渗、抗冻性能较优;减水剂的加入有效改善了掺量较大时混凝土性能下降的问题;将建筑垃圾微粉作为混凝土掺合料具有环保和经济意义。

Study on properties of concrete with admixture of construction waste powder performance

In order to carry out resource treatment for construction waste powder, the paper took construction waste micro whose particle size is less than 0.16 mm as admixture of concrete,according to powder ratio of 0%, 5%, 10%, 15%, 20% ,the cement is replaced by the powder so as to make concrete. In order to explore the effects of the construction waste powder as concrete admixture, it tested ompressive strength, flexural strength, permeability resistance, freeze-thaw cycle both in fresh water and artificial seawater. The result indicated that with the increase of powder mixing proportion, the strength of concrete decreases;the flexural performance, anti-permeability and frost-resistance capability of concrete is optimal when adding proportion of powder is 5% in the five groups of test;water reducer can improve the problem of reducing performance of concrete with large powder adding amount;the utilization of construction waste powder as concrete admixture has environmental protection and economic significance.