Investigation of concrete mix variations and environmental conditions on defect detection ability using GPR

2014 ◽  
Vol 65 ◽  
pp. 35-46 ◽  
Author(s):  
S. Yehia ◽  
N. Qaddoumi ◽  
S. Farrag ◽  
L. Hamzeh
Keyword(s):  
Defect Detection ◽  
Environmental Conditions ◽  
Detection Ability ◽  
Concrete Mix

Assessment of Concrete Quality of Load-Bearing Structure of the Bridge across Otava River No. 121-006 near Zvikov after Fifty Years of Operation in Severe Environmental Conditions

2016 ◽  
Vol 722 ◽  
pp. 72-78 ◽  
Author(s):  
Stanislav Rehacek ◽  
David Čítek ◽  
Jiri Kolisko ◽  
Petr Huňka
Keyword(s):  
Compression Strength ◽  
Environmental Conditions ◽  
Visual Inspection ◽  
Load Bearing ◽  
Concrete Carbonation ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Bearing Structure

This paper is introducing results of diagnostic survey of bridge no. 121-006 across Otava river near Zvikov [1], focusing on assessment of quality of concrete mix used for load-bearing structure of the bridge after more than 50 years of operation and assessment of reconstruction works (monolithic assembly of central joints of main fields) executed in 1994 [2]. Visual inspection of monolithic assembly joints, comparison of depth of concrete carbonation and thickness of top layer of reinforcement concrete and concrete compression strength are presented in this paper.

A Study of the Preparation and Properties of the Concrete for the Bearing Platform of the Xiamen-Zhangzhou Sea-Spanning Bridge

2013 ◽  
Vol 357-360 ◽  
pp. 659-666
Author(s):  
Hong Mei Hu ◽  
Hao Wang ◽  
Rong Gui Du ◽  
Bo Shen Zheng ◽  
Yun Kun Yi ◽  
...  
Keyword(s):  
Fly Ash ◽  
Optimal Design ◽  
Environmental Conditions ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Diffusion ◽  
Mass Concrete ◽  
Concrete Mix ◽  
Marine Concrete ◽  
Main Bridge

In light of the requirement of mass concrete for the bearing platform of the main tower of the Beicha Main Bridge of the Xiamen-Zhangzhou Sea-spanning Bridge, and in view of the hostile environmental conditions for the project, a study was conducted on the technology of preparing high-performance marine concrete for the bearing platform of the sea-spanning bridge in order to control concrete temperatures and achieve the desired durability for the bridge. With an optimal design which features the binary admixture of fly ash and slag and an optimal concrete mix ratio, high-performance concrete with lower hydration heat and strong resistance to chloride diffusion and cracking was successfully developed for the bearing platform of the sea-spanning bridge.

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

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