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Micro Expansion Concrete-filled Steel Tube to Long-span Arch Bridge Test Research

Author: LiHengTang
Tutor: DiShengKui
School: Lanzhou University of Technology
Course: Bridge and Tunnel Engineering
Keywords: Micro-expansion Steel Pipe Concrete Arch bridge Mechanical Properties
CLC: U444
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


The steel concrete has superior mechanical properties and good economic returns, more and more attention by national civil engineering sector , and vied development and utilization . CFST Arch Bridge because of its large cross , wide bridge , light weight , high strength, attractive appearance , etc. also appear more and more . Steel pipe internal concrete quality safety engineering structure a great influence on the slightest mistake may cause the quality of the accident or defect , such as a tube air entrapment , the concrete is not full , too contraction gap between the concrete and steel pipe caused structural bearing force drop phenomenon. Therefore, the requirements of the fresh concrete mixture should have slump , workability , no bleeding , pumpability and retarding a long time and so on ; hardened concrete should have from the tightness , contraction tiny high early strength characteristics , which micro - expansive concrete mixture ratio design brings difficulty ; and steel tube concrete pouring after the concrete is not visible , which brought inconvenience to detect the physical structure of concrete strength performance ; same time, the collaborative work of concrete and steel pipe detection is a very complex problem . In this paper, the actual practical engineering , divided into five chapters do test and research aspects : ( 1) discusses the impact of raw materials on the micro- expansive concrete and scientific selection of the raw materials used to configure the micro-expansion concrete . (2) using orthogonal test method designed benchmark the C55 Microdilatant concrete mixing ratio . ( 3) For the benchmark with different dosage of expansive agent ratio based on the expansion rate of the micro - expansive concrete were measured and analyzed . (4 ) For the purposes of test and analysis of selected specific expansion agent dosage concrete mixture pouring different diameter steel pipe and PVC pipe component testing and analysis , and to draw the appropriate conclusions . (5 ) the use of MADIS software modeling simulation calculation results are listed . (6) Finally, wireless test system combined with field installation of concrete strain gauges and surface strain gauges , the stress of the steel and concrete of the actual project site testing and research , and the to combine the MADIS software simulation results were compared , on steel pipe the concrete collaboration work performance eventually come to the conclusion .

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