周文娟，张 晨，胡牛涛
(北京建筑大学 土木与交通工程学院，北京 100044)
DOI：10.13732/j.issn.1008-5548.2022.05.009
收稿日期： 2022-04-07， 修回日期：2022-05-14，在线出版时间：2022-07-29 15:06。
基金项目：“十三五”国家重点研发计划项目，编号：2017YFC0703305。
第一作者简介：周文娟(1977—)，女，副教授，硕士，硕士生导师，研究方向为固体废弃物的资源化利用。E-mail:zhouwenjuan@bucea.edu.cn。
摘要：为探究再生微粉材料性能与混凝土性能的关系，采用X射线衍射(XRD)、 X射线荧光光谱(XRF)、扫描电子显微镜(SEM)、激光粒度分析、氮气吸附法、勃氏透气法等方式对再生微粉材料性能进行表征；研究掺加再生微粉后的混凝土抗压强度、抗碳化性能、抗冻性能的变化。结果表明：再生微粉内表面积大，孔体积为0.045 cm3/g,内部微孔孔径2～5 nm,表面粗糙，在混凝土中的吸水量大；再生微粉粒径较大，潜在活性较低，掺入混凝土后具有微集料效应和活性效应；混凝土中单掺再生微粉，抗碳化性能降低，抗压强度减小，但掺入质量分数小于20%时，混凝土抗压强度比不低于0.7;与粉煤灰或矿粉复掺入混凝土后抗压强度、抗碳化性能均有提高；矿粉与再生微粉以质量比为2∶1复掺入混疑土的抗压强度、抗碳化性能提高明显；抗冻性能测试中冻融循环次数较少时，单掺再生微粉的混凝土具有更好的抗冻性能，复掺矿粉的抗冻性能总体较好。
关键词：再生微粉；混凝土；抗压强度；抗碳化性能；抗冻性能
Abstract：In order to explore the relationship between the properties of recycled micro powder materials and the properties of concrete, the properties of recycled micro powder materials were characterized by XRD, XRF, SEM, laser particle size analysis, nitrogen adsorption method and Burt permeability method. The changes of compressive strength, carbonation resistance and frost resistance of concrete after adding recycled micro powder were studied. The results show that the recycled micro powder has large internal surface area, pore volume of 0.045 cm3/g, internal pore diameter of 2～5 nm, rough surface and large water absorption in concrete. Recycled micro powder has large particle size and low potential activity. It has micro aggregate effect and activity effect after being added into concrete. When recycled micro powder is added to the concrete, the carbonation resistance and compressive strength are reduced, but when the mass fraction is less than 20%, the compressive strength ratio of the concrete is not less than 0.7. The compressive strength and carbonation resistance of concrete mixed with fly ash or mineral powder are improved. When the mass ratio of mineral powder to recycled micro powder is 2∶1, the compressive strength and carbonation resistance of mixed soil are significantly improved. When the number of freeze-thaw cycles is small in the frost resistance test, the concrete mixed with recycled micro powder has better frost resistance, and the concrete mixed with mineral powder has better frost resistance as a whole.
Keywords：recycled micro powder; concrete; compressive strength; carbonation resistance; frost resistance
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