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不同分子质量PEG对水泥基材料性能的影响
作者：孔德玉1，孙浩铨1，王蓉1，曾法军2，张永军3，陈元朋4
（1.浙江工业大学 土木工程学院，浙江 杭州 310023；2.杭州运河集团建设管理有限公司，浙江 杭州 310011；3.浙江农林大学 公共事务管理处，浙江 杭州 311300；4.浙江泛华工程咨询有限公司，浙江 杭州 310005）
摘要：研究了相对分子质量分别为1000和6000的2种聚乙二醇（分别记为P10和P60）对水泥基材料性能的影响。结果表明：掺P60对水泥砂浆的增黏效果明显优于掺P10。掺P60对水泥砂浆3 d和28 d抗折、抗压强度有明显增强作用，但养护至90 d时，其增强效果已不明显；掺P10则在所有龄期对水泥砂浆均无明显增强效果。掺聚乙二醇（PEG）可一定程度上减小水泥砂浆在6.0 mol/L氯化铵溶液中浸泡的强度损失率，但其对砂浆抗溶蚀性能和抗氯离子渗透性能均有不利影响。掺P10对水泥砂浆抗氯离子渗透性能的不利影响明显小于掺P60，其原因是掺P10对硬化水泥石毛细孔和有害孔的影响较小所致。
关键词：聚乙二醇（PEG）；水泥基材料；力学性能；耐久性；微观结构
中图分类号：TU528.32 文献标识码：A 文章编号：1001-702X（2023）02-0074-05
Effects of PEG with different molecular weight on properties of the cement-based materials
KONG Deyu1，SUN Haoquan1，WANG Rong1，ZENG Fajun2，ZHANG Yongjun3，CHEN Yuanpeng4
（1.College of Civil Engineering，Zhejiang University of Technology，Hangzhou 310023，China；2.Hangzhou Canal Group Construction Management Co. Ltd.，Hangzhou 310011，China；3.Office of Public Affairs，Zhejiang Agriculture and Forestry University，
Hangzhou 311300，China；4.Zhejiang Fanhua Engineering Consulting Co. Ltd.，Hangzhou 310005，China）
Abstract：The effects of two polyethylene glycols with average molecular weight of 1000 and 6000（abbreviated as P10 and P60，respectively） on the properties of the cement-based materials were investigated. The results showed that P60 possessed an obviously better thickening effect on the fresh cement paste than P10. The flexural and compressive strengths of the cement mortar at the curing age of 3 d and 28 d were obviously enhanced by incorporating P60，but not at 90 d，and also no obvious enhancement was observed while incorporating P10 at the curing age of 3 d，28 d and 90 d. The addition of PEG can reduce strength loss of cement mortar after immersed in 6.0 mol/L NH4Cl to a certain extent，but both of them showed an adverse effect on the resistance of calcium leaching and chloride ion penetration of the hardened mortar. The adverse effect on chloride ion penetration resistance of the cement mortar with P10 addition was significantly fewer than that with P60，which is typically due to the fact that the hardened cement paste with P10 possessed fewer capillary pores and harmful pores than that with P60.
Key words：Polyethyl glycol（PEG），cement-based materials，mechanical properties，durability，microstructure