微膨胀聚丙烯纤维混凝土在巴东长江.docVIP

微膨胀聚丙烯纤维混凝土在巴东长江 公路大桥桥面铺装中的应用 ? 单俊鸿[1,2]，周明凯2，李北星3 ? (l.河北工程学院，河北邯郸056038; 2.武汉理工大学硅酸盐材料工程教育部重点实验室，湖北武汉430070; 3.武汉大学，湖北武汉430072) ? 【摘要】根据巴东长江大桥桥面铺装层的设计要求，对厚100 mm的C40防水混凝土进行了微膨胀聚丙烯纤维混凝土的配合比设计、性能试验和桥面铺装施工措施研究。结果显示，采用聚丙烯纤维和UEA-I膨胀剂补偿收缩的混凝土具有优良的抗裂、抗渗、耐磨、抗冲击、抗疲劳等性能。选定的微膨胀聚丙烯纤维混凝土配合比在巴东长江大桥桥面铺装层中进行了全面施工应用，效果十分理想。 【关键词】桥面；聚丙烯纤维混凝土；膨胀剂；配合比；施工 中图分类号:TV431.3 文献标识码:B 文章编号:1000-0860 (2005) 03-0044-03 ? Application of micro-expansion polypropylene fiber concrete to the deck pavement of Badong Highway Bridge on Yangtze River ???????????? SHAN Jun-hong, ZHOU Ming-kai, LI Bei-xing ??? (1 .Hebei University of Engineering，Handan 056038，Hebei，China;2.Wuhan University of Technology，Wuhan 430070，Hubei China;3.Wuhan University，Wuhan 430072，Hubei，China) ? Abstract: In accordance with the design of the requirement for the deck pavement of Badong Highway Bridge on Yangtze River, the study on the mix design for the micro-expansion polypropylene fiber concrete (a concrete with minute-expansion agents), the performance experiment and the construction measures of the pavement on the bridge deck is made for the C40 water proof concrete with the thickness of 100mm concerned. The result shows that the concrete mixed with polypropylene fiber and UEA-I expansion agent has the excellent properties against permeation, creaking, wearing, impact, fatigue and freeze-thaw etc. Through the study, the selected mixing ratio of the micro-expansion polypropylene fiber concrete is applied to the concrete for the pavement on the deck of the bridge and the effect is perfect as well. Key words: deck pavement; polypropylene fiber concrete; expansion agent, missing ratio; construction ? 1引言 ??? 巴东长江公路大桥是国道209线在湖北省西部巴东县境内、处于三峡水利工程库区内长江主河道上跨越长江的一座建设规模宏大、结构新颖、造型美观、结构受力复杂的特大型桥梁，属交通部和湖北省交通基本建设重点工程。该桥为双塔双索面预应力混凝土漂浮体系斜拉桥，其主跨长388m，主塔高212m，北岸引桥为简支梁式桥。桥型布置为简支T型梁(4 x 40)m+PC斜拉梁桥(40+130+388+130+40)m，桥梁全长900.5m，桥面宽19m，双向四车道，车行道宽16m，两侧各设1.5m人行道.该桥桥面铺装层设计采用100mm厚C40防水混凝土浇筑。 ??? 通常，普通混凝土桥面铺装层由于设计厚度较薄(80～150 mm)，脆性大，在行车过程中，在弯拉荷载、冲