摘要
为提高建筑垃圾废砖再生利用率,采用砂浆力学测试手段研究了建筑垃圾砖粉活性和碱激发、复合激发对建筑垃圾砖粉活性的影响,并借助扫描电镜和热分析方法对建筑垃圾砖粉、建筑垃圾复合粉体材料的颗粒形貌、水化产物组成等进行了研究。结果表明:建筑垃圾砖粉活性较小,当掺量大于20%时,砂浆强度随其掺量的增加直线下降;不同碱激发剂对建筑垃圾砖粉有不同的激发效果,Ca(OH)2激发效果最好,NaOH次之,Na2SiO3·9H2O激发效果最差;复合形成的建筑垃圾复合粉体材料具有较好的活性,当其掺量不超过40%时,砂浆28d抗压强度高达50 MPa。微观分析结果表明:建筑垃圾复合粉体材料比砖粉具有更好的颗粒级配,在其水化过程中降低了稳定性较差的Ca(OH)2含量,提高了水泥石密实度,是一种经济、环保的新材料。
In order to improve the reuse rate of construction waste bricks,studied the influences of alkali and compound modifications on activity of construction waste brick powder based on cement mortar strength tests.This paper also studied the particle morphology and hydration products of brick powder and construction waste composite powder by using scanning electron microscope（SEM）and thermal analysis.The results show：the construction waste brick powder has low activity itself,cement mortar strength declined linearly with increase of the brick powder dosage when its dosage was larger than 20%;different modifications had different degrees of influence on brick powder activity,Ca（OH）2 had the best modification effectiveness,followed by NaOH and then Na_2SiO_3 ·9H_2O;construction waste composite powder had good activity,28 dstrength of cement mortar could reach 50 MPa when its dosage was less than 40%.Compared to brick powder,construction waste composite powder had better particle distribution,and it also reduced Ca（OH）2content during hydration process,resulted in higher cement compactness,which indicated that the construction waste composite powder was a kind of economical and environmental-friendly material.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第10期130-134,共5页
Materials Reports
基金
国家自然科学基金(211000120308)
建筑垃圾研究(220021130087)
中央高校基本科研业务费专项资金项目(310821165012)
关键词
砂浆强度
建筑垃圾砖粉
碱激发剂
建筑垃圾复合粉体材料
微观机理
cement mortar strength
construction waste brick powder
alkali activator
construction waste composite powder
micro-mechanism
