EHANCED PRACTICAL APPLICATIONS OF HIGH-STRENGTH CONCRETE FOR PRESTRESSED CONCRETE BRIDGES
Despite of recent developments of high-performance and multi-functional concrete, about 40MPa design strength concrete have been used on superstructures of prestressd concrete (PSC) bridges for the last several decades. Therefore the final objective of this paper is to obtain data for the practical construction of cast-in-placing high-strength concrete, especially over 60MPa design strength, in order to apply it to superstructures of PSC bridges. After the laboratory experimental programs of basic properties for seven different mix proportions suited to 60MPa design strength, three mixtures of the ordinary Portland cement (OPC), OPC with 30％ blast furnace slag (BS30), and low-heat cement (LHC) were chosen among seven mixtures, simulations of pumping and the adiabatic temperature rise tests were carried out. For practical application in the field, mock-up test was performed. 150m passing pipes were set horizontally and concrete were casted 40 minutes after production for each mixture. To measure temperature tendencies, thermocouples were installed in the middle, upper surface, side surface, and corner of three 1.2m cubic specimens and test results were compared with Heat-Con programs results. Also compressive strengths were measured for before and after pumped concrete, respectively.
High-strength concrete prestressed concrete mix proportion pumping heat of hydration mock-up test cast-in-place
K. H. Min Y. S. Yoon T. G. Lee H. M. Cheong T. S. Ahn
Department of Civil, Environmental and Architectural Engineering, Korea University, Seoul, Korea Department of Railroad, Civil and Environmental Engineering, Woosong University, Daejeon, Korea Highway and Transportation Technology Institute, Korea Highway Corporation, Gyeonggi-do, Korea
国际会议
上海
英文
1248-1256
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）