摘要
为保证管片质量的条件下进一步优化地铁盾构管片生产工艺，提高管片生产效率，研究了掺VIVID早强型聚羧酸减水剂的管片混凝土的水灰比、坍落度、含气量及蒸养时间对管片生产的影响，结果表明：水灰比降低至0．28-0．31，坍落度控制在30-70mm，可以缩短混凝土静停预蒸养时间至1h左右；含气量增加会降低混凝土强度，并影响管片外观质量；管片蒸养时间可由4．5h缩短至3．5h。
To optimize subway shield segment porduction process and improve segment production efficiency, VIVID Polycarbonate Superplasticiazer is used while ensuring the quality of segment.Some variation effecting on segment production is studied,such as water to cement ratio （W/C）, slump, and air content etc.The results show that segment concrete presteamed time is shorted to 1 h when W/C maintains in 0.28--0.31 and slump is controlled in 30-70 ram.Increasing air content would decrease concrete compressive strength, and make segment looks ugly.The steamed time of segment concrete with VIVID would be reduced from 4.5 h to 3.5 h.
出处
《混凝土》
CAS
CSCD
北大核心
2010年第1期127-129,共3页
Concrete
基金
上海市优秀学科带头人计划项目(08XD14229)
上海市科技启明星计划项目(07QB14048)
关键词
早强
聚羧酸减水剂
脱模强度
盾构管片
early strength
polycarbonate superplasticizer
demoulding strength
shield segment
