摘要
采用甲基烯丙基聚氧乙烯醚(HPEG)为大单体合成一系列具有不同酸醚比、侧链长度及相对分子质量的聚羧酸系减水剂(PCE)作为水泥助磨剂,研究了PCE分子结构对其助磨性能的影响.结果表明:PCE的助磨效果随着酸醚比的增大而增强,当酸醚比超过一定范围后,助磨效果有所减弱;具有短侧链及低相对分子质量的PCE具有更好的助磨效果;PCE磨制水泥的标准稠度用水量降低,16 h抗压强度降低,28 d抗压强度没有损失.
Usingα-methallyl-ω-hydroxy poly(ethylene glycol)(HPEG)as macromonomer,a series of polycarboxylate-based superplasticizer(PCE)with different acid-to-ether ratios,side chain length and relative molecular mass were prepared and used as cement grinding aids.The influence of PCE molecular structure on its grinding efficiency was investigated.The results indicate that the optimal grinding efficiency is provided by a PCE with a proper acid-to-ether ratio.Short side chain length and low relative molecular mass are preferred.Compared to the reference,the cement produced with PCE exhibits a decreased water demand for standard consistency,and the compressive strength decreases at 16 h without any loss at 28 d.
作者
杨海静
孙振平
PLANK Johann
水亮亮
董耀武
YANG Haijing;SUN Zhenping;PLANK Johann;SHUI Liangliang;DONG Yaowu(Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Department of Chemistry,Technische Universität München,Garching 85747,Germany;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;Wuhan Youcheng Technology Co.,Ltd.,Wuhan 430000,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2022年第1期54-60,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51678441)
上海市科委项目(19DZ1202702,19DZ1201404)
上海市建委专项课题(住建管2021-001-002)。
关键词
水泥助磨剂
聚羧酸系减水剂
分子结构
粉磨效率
cement grinding aid
polycarboxylate-based superplasticizer(PCE)
molecular structure
grinding efficiency
