预应力高强混凝土管桩用聚羧酸减水剂的合成与应用  

Preparation and application of polycarboxylate for pre-stressed high-strength concrete pile

作　　者：王小兵[1,2] 王涛[1,2] 吴益[1,2] 李宝川[1,2] 董兆彬 陈囡[1,2] 杨海荣[1,2] 

机构地区：[1]常州建筑科学研究院 [2]江苏尼高科技有限公司,江苏常州213015

出　　处：《新型建筑材料》2014年第12期70-73,共4页New Building Materials

基　　金：江苏省建设系统科技项目(2013JH06)

摘　　要：采用丙烯酸、马来酸酐、甲基烯丙醇聚氧乙烯醚2400 （HPEG2400）、异戊烯醇聚氧乙烯醚2400 （TPEG2400）、N-羟甲基丙烯酰胺、甲基丙烯磺酸钠,合成了预应力高强混凝土管桩用聚羧酸减水剂.研究了HPEG/TPEG质量比与丙烯酸/马来酸酐质量比对减水剂的减水性,N-羟甲基丙烯酰胺用量对减水剂黏聚性,亲水亲油平衡值对混凝土含气量,甲基丙烯磺酸钠用量对混凝土凝结时间的影响.对合成的聚羧酸减水剂进行了表征和管桩试生产.结果表明：当m （HPEG2400）∶m （TPEG2400）=1∶1,m（丙烯酸）∶m（马来酸酐）=1∶1,N-羟甲基丙烯酰胺用量为0.35％,亲水亲油平衡值控制在52.5～54.3,甲基丙烯磺酸钠用量为0.7％时,合成的聚羧酸减水剂应用于管桩混凝土,具有低引气、凝结时间短、强度高、黏聚性好、容易离心脱水、不易挂浆等优点.Polycarboxylate was synthesized with acrylic acid,maleic anhydride,methallyl alcohol polyoxyethylene ethe 2400 （HPEG2400）,isoamyl alcohol polyoxyethylene ethe 2400 （TPEG2400）,N-methylol acrylamide,and sodium methylallyl sulfonate,which was used into pre-stressed high strength concrete pile.Studied：HPEG/TPEG and acrylic acid/maleic anhydride mass ratio of the water reducing,and retention,N-methylol acrylamide dosage of cohesive,hydrophilic-lipophilic balance value on the gas containing,methacrylic acid sodium dosage on settingtime.Synthetic polycarboxylate was characterized,and carried out trial production of the pile.The results showed that when HPEG2400 1∶1 mass ratio with the TPEG2400,acrylic acid 1∶1 mass ratio with the maleic anhydride,N-methylol acrylamide in amount of 0.35％,the hydrophilic lipophilic balance value 52.5～54.3,sodium methylallyl sulfonate in amount of 0.7％,synthetic polycarboxylate was applied pile concrete,which had advantages of low airentraining,short setting time,high strength,cohesiveness,and easy centrifugal dehydration,not linked to pulp and so on.

关 键 词：聚羧酸减水剂 亲水亲油平衡值 甲基丙烯磺酸钠 N-羟甲基丙烯酰胺 预应力高强混凝土管桩 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]