早强型聚羧酸减水剂的常温合成及性能研究
详细信息 查看官网全文
摘要
采用水溶液聚合法,将大分子量的异丁烯醇聚氧乙烯醚(HPEG,M=4000)与丙烯酸(AA)共聚,并引入具有早强功能的小单体M1,合成了一种促凝早强型聚羧酸系减水剂(AH-PCE)。通过净浆、水化热,常温及低温混凝土测试可知,该减水剂具有较高的减水率和较短的混凝土凝结时间,对混凝土早期强度(1d、3d、7d)有明显的提高。在铁盾构管片厂应用结果表明,采用AH-PCE能有效改善混凝土的和易性,具有良好的触变性能,可有效缩短盾构管片脱模时间,提高了冬季低温条件下的生产效率。
引文
[1]李维柏.新型聚羧酸减水剂在兰州地铁盾构管片中的应用[J]工业科技,2015,44(3):11-14.
[2]Pepi P.Admixture for producing cementitious compositions having good fluidity and high early compressive strength:US,6767399[P].2004-07-27.
[3]林艳梅.早强型聚羧酸高性能减水剂的合成研究[J]新型建筑材料,2014(5):11-14.
[4]郭鑫祺,于飞宇.早强型聚羧酸系高性能减水剂的研制与应用[J]福建建筑,2008,(10):48-49.
[5]Ran Qianping,Liu Jiaping,Miao Changwen.Effect of the side chain length of comb-like copolymer superplasticizer on early hydration propertiesof concentrated cement suspensions[J].Journal of the Chinese Ceramic Society 2010 38(9):1718-1722.
[6]Winnefeld F,Becker S,Pakusch J,et al.Effects of the molecular architecture of comb-shaped superplasticizers on their performance in cementitious systems[J].Cement and Concrete Composites,2007,29(2):251-262.
[2]Pepi P.Admixture for producing cementitious compositions having good fluidity and high early compressive strength:US,6767399[P].2004-07-27.
[3]林艳梅.早强型聚羧酸高性能减水剂的合成研究[J]新型建筑材料,2014(5):11-14.
[4]郭鑫祺,于飞宇.早强型聚羧酸系高性能减水剂的研制与应用[J]福建建筑,2008,(10):48-49.
[5]Ran Qianping,Liu Jiaping,Miao Changwen.Effect of the side chain length of comb-like copolymer superplasticizer on early hydration propertiesof concentrated cement suspensions[J].Journal of the Chinese Ceramic Society 2010 38(9):1718-1722.
[6]Winnefeld F,Becker S,Pakusch J,et al.Effects of the molecular architecture of comb-shaped superplasticizers on their performance in cementitious systems[J].Cement and Concrete Composites,2007,29(2):251-262.