地铁盾构管片混凝土用高性能聚羧酸减水剂的合

关键字：地铁,盾构,管片,混凝土,高性能,聚羧酸,减水剂

（科之杰新材料集团有限公司，福建 厦门  361101）

 
 
    摘要：采用丙烯酸、异丁烯醇聚氧乙烯醚（HPEG）、丙烯酰氧乙基三甲基氯化铵（DAC），通过自由基溶液聚合合成了地铁盾构管片混凝土用高性能聚羧酸减水剂。研究了不同分子质量大单体、酸醚比、DAC用量等因素对减水剂性能的影响。结果表明，当采用HPEG（Mn=4000），酸醚比为3.0∶1.0，DAC用量为大单体质量的1.3%时，合成的高性能聚羧酸减水剂应用于地铁盾构管片混凝土，具有初凝时间短、触变性好、粘聚性好、强度高等优点
    关键词：聚羧酸减水剂；地铁盾构管片；早期强度；初凝时间；合成
    中图分类号：TU528.042+2        文献标识码：A        文章编号：1001-702X（2018）01-0033-04
 

Synthesize research on high-performance polycarboxylate superplasticizer for the subway shield tunnel segment concrete
LIN Yanmei
（KZJ New Materials Group Co. Ltd.，Xiamen 361101，China）

    Abstract：High-performance polycarboxylate superplasticizer for the subway shield tunnel segment concrete was synthesized with acrylic acid，Polyoxyethylene（HPEG），and acryloyl oxyethyl trimethyl ammonium chloride（DAC）. It was synthesized by free radical solution polymerization. The effect of different molecular mass macromonomer，acid/ether mole ratio，and DAC dosage on the properties of superplasticizer was resarched. The results showed that when HPEG molecular weight was 4000，acid/ether mole ratio was 3.0/1.0，DAC dosage was 1.3% of HPEG，synthetic polycarboxylate was applied to the subway shield tunnel segment concrete，which had advantages of short initial setting time，good thixotropy，good cohesiveness，high strength and so on.
    Key words：polycarboxylate superplasticizer，the subway shield tunnel segment，early strength，initial setting time，synthesis