Shrinkage of Full-Scale Girders Cast with Self-Consolidating Concrete

摘要：

Shrinkage can be critical factor for the design of structural members due to the length changes by the time-dependent deformation. In this investigation, two self-consolidating concrete (SCC) and two high-performance concrete (HPC) mixtures with target 56-day compressive strengths of 55 and 69 MPa and having 18-hour release strengths of 34.5 MPa and 43 MPa, respectively, were used to cast four fullscale AASHTO-Type II girders measuring 9.44-m in length. For each strength level, the SCC and HPC mixtures were proportioned with the same water-tocementitious materials ratio (w/cm) and binder type. The high-range water-reducing admixture (HRWRA) dosage was adjusted to obtain a slump flow of 680 ± 20 mm for the SCC mixtures and a slump of 160±20 mm for the HPC mixtures. The constructability and shrinkage of full-scale girders cast with SCC and HPC mixtures used in precast prestressed girders were investigated and compared. Results of tests on full-scale girders indicated that, SCC placement was successfully carried out by casting the concrete from location at the midspan of the 9.44-m long girders. Both HPC and SCC mixtures developed similar autogenous shrinkage for the mixtures made with the similar w/cm; the two SCC mixtures developed about 20％ greater drying shrinkage than the comparable HPC mixtures after 112 days of drying.

关键词： full-scale girder mechanical properties autogenous shrinkage drying shrinkage prestressed concrete

作者: Wu Jian Long Kamal Henri Khayat Feng Xing

作者单位: Shenzhen Durability Center for Civil Engineering,Shenzhen University,Shenzhen,China Shenzhen Durabil Faculty of Civil Engineering,Universite de Sherbrooke,Sherbrooke,Quebec,Canada Shenzhen Durability Center for Civil Engineering,Shenzhen University,Shenzhen,China

会议类型: 国际会议

会议名称: 2010 International Conference on Material and Manufacturing Technology(2010材料与制造技术国际会议 ICMMT2010)

会议地点: 重庆

会议语种:英文

页码: 381-385

在线出版日期: 2010-09-17（万方平台首次上网日期，不代表论文的发表时间）