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- 建筑石膏与胶凝材料
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建筑废弃物除尘粉的组分特性及其对水泥净浆力学性能的影响研究
作者：洪永鹏1，宋红旗2，韦华栋1，孟涛1，王仲佳1，3
（1.浙江大学 建筑工程学院，浙江 杭州 310058；2.山西六建集团有限公司，山西 太原 030024；
3.杭州龙湖房地产开发有限公司，浙江 杭州 310016）
摘要：为了明确建筑废弃物除尘粉的组分和工程特性，对除尘粉的粒度分布、化学和矿物组成、微观形貌进行了测试分析，并对掺加除尘粉后水泥净浆的抗压强度进行了测试。结果表明：除尘粉颗粒粒径小，比表面积大，粒径分布较均匀；除尘粉的化学组成和粉煤灰相近，但CaO含量较高，Al2O3和Fe2O3含量较低；掺加除尘粉后，水泥净浆的抗压强度呈下降趋势。在水化早期，掺加除尘粉对水泥净浆的抗压强度影响较大，但随着龄期的延长，除尘粉对水泥净浆抗压强度的影响逐渐减小。同时，随着龄期的延长，抗压强度增长速率随着除尘粉掺量的增加而增大。
关键词：建筑废弃物；除尘粉；粒度分布；水泥净浆；抗压强度
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2020）02-0077-04
Study on composition characters of recycled powder from C&DW and its effect on the mechanical properties of cement paste
HONG Yongpeng1，SONG Hongqi2，WEI Huadong1，MENG Tao1，WANG Zhongjia1，3
（1.College of Civil Engineering and Architecture，Zhejiang University，Hangzhou 310058，China；
2.Shanxi Sixth Construction Group Co. Ltd.，Taiyuan 030024，China；
3.Hangzhou Longfor Real Estate Development Co. Ltd.，Hangzhou 310016，China）
Abstract：In order to further clarify the composition properties and engineering characteristics of the recycled powder（RP）
from construction and demolition wastes，the basic properties including particle size distribution，chemical and mineral composition，micro-morphology were first studied，and compressive strength of cement paste with RP was analyzed in this paper. The results showed that：the RP possessed a small particle size，large specific surface area，and uniform particle size distribution；the chemical composition of the RP was similar to that of fly ash，while its CaO content was higher，and the content of Al2O3 and Fe2O3 was lower than fly ash. The compressive strength of the cement paste with RP showed a downward trend. In the early age of hydration，the content of RP presented a great influence on the compressive strength. With the development of hydration，the influence was gradually reduced. Meanwhile，the increase rate in compressive strength increased with the increase of RP content.
Key words：construction and demolish waste，recycled powder，particle size distribution，cement paste，compressive strength