scholarly journals VERIFICATION OF BOND BEHAVIOR BY THE PRIMER AND ADHESIVE FOR THE BOTTOM SURFACE THICKENING METHOD FOR THE HIGHWAY BRIDGE RC SLAB

2016 ◽  
Vol 70 (1) ◽  
pp. 533-540
Author(s):  
Tadashi ABE ◽  
Atsuya KOMORI
Keyword(s):  
Bottom Surface ◽  
Highway Bridge ◽  
Bond Behavior ◽  
Rc Slab

scholarly journals NON-DESTRUCTIVE EVALUATION FOR HORIZONTAL CRACKS IN EXISTING RC SLABS BY ANALYSIS-AIDED IMPACT ELASTIC-WAVE METHODS

2012 ◽  
Vol 06 ◽  
pp. 670-675
Author(s):  
Heung-Soo Lee ◽  
Toshiro Kamada ◽  
Shinya Uchida ◽  
Toshiki Iwasaki
Keyword(s):  
Elastic Wave ◽  
Highway Bridges ◽  
Bottom Surface ◽  
Response Analysis ◽  
Wave Method ◽  
Rc Slab ◽  
Ball Diameter ◽  
Rc Slabs ◽  
Wave Methods ◽  
Non Destructive

In this study, impact elastic-wave method was performed at the bottom surface of RC slab cut from an existing highway bridges to survey the horizontal cracks. Before measurements by impact elastic-wave method, impact response analysis was applied to determine optimal steel ball diameter, distance between impact point and receiving point of elastic-wave. Efficiency of analysis-aided impact elastic-wave method was confirmed by drilling and observing the interior of the RC slab by stick scanner. Evaluation results by this method agreed well with results of visual inspection. Thus, validity of the analysis-aided impact elastic-wave method on detection of horizontal cracks in RC slabs of highway bridges was demonstrated.

scholarly journals Evaluation for Relative Safety of RC Slab Bridge of Applying Limit State Design Code on Korean Highway Bridge

2013 ◽  
Vol 28 (5) ◽  
pp. 41-48 ◽  
Author(s):  
Jin-Woo Park ◽  
Hoon-Hee Hwang ◽  
Sin-Oh Kang ◽  
Kyung-Sik Cho ◽  
Woo-Jin Park
Keyword(s):  
Limit State ◽  
Highway Bridge ◽  
Design Code ◽  
Limit State Design ◽  
Relative Safety ◽  
Rc Slab

Estimation of the deterioration for highway bridge RC slab by impact acoustics method

2014 ◽  
pp. 2090-2096
Author(s):  
S Kitagawa ◽  
S Kimura ◽  
M Moriyama ◽  
M Nabetani ◽  
N Utagawa
Keyword(s):  
Highway Bridge ◽  
Rc Slab

scholarly journals UHPC Overlays for Highway Bridge Decks: Bond Behavior, Durability, and Structural Performance

2019 ◽  
Author(s):  
Zachary Haber ◽  
Igor De La Varga ◽  
Jose F. Munoz ◽  
Benjamin A. Graybeal
Keyword(s):  
Bridge Decks ◽  
Structural Performance ◽  
Highway Bridge ◽  
Bond Behavior

scholarly journals Numerical Simulation of Cracked Reinforced Concrete Slabs Subjected to Blast Loading

2018 ◽  
Vol 4 (2) ◽  
pp. 320
Author(s):  
Wenjiao Zhang ◽  
Xiangqing Kong ◽  
Yandong Qu ◽  
Qian Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Failure Time ◽  
Blast Loading ◽  
Element Model ◽  
Initial Crack ◽  
Bottom Surface ◽  
Rc Structures ◽  
Reinforced Concrete Slabs ◽  
Rc Slab

Crack is one of the most common defects observed in reinforced concrete (RC) structures. An initial crack will lead to severe changes in the stress state when the structure subjected to blast loadings. Target on acquiring the dynamic data, a finite element method is applied to simulate the response of cracked RC slab subjected to blast loading. The theoretical results of damage distribution and mid-span deflection of normal specimens are first compared with experimental test, which indicates that the dynamic behaviour of RC slab under blast loading can be well predicted by the finite element model. Then blast responses of cracked RC slabs with varied crack parameters (e.g. orientation, width and depth) are systematically studied. Results show that damage of the cracked slab initiates from the initial crack tip of the bottom surface, and then it propagates quickly with cracks found in the support areas on the top surface. In addition, the existence of initial cracks in the RC slab make it subject to more serious damages than the normal RC slab under the same explosive loads, as well as a short reacted failure time. Moreover, variations of crack parameters have slight influences on the distributions of cracked RC slab.

Nondestructive Testing and Evaluation of a Diseased Highway Bridge

2011 ◽  
Vol 101-102 ◽  
pp. 658-661
Author(s):  
Shun Bo Zhao ◽  
Song Wei Pei ◽  
Ji Hao Chen ◽  
Xi Jian Liang
Keyword(s):  
Nondestructive Testing ◽  
Prestressed Concrete ◽  
Concrete Cover ◽  
Steel Plates ◽  
Fiber Reinforced Polymer ◽  
Bottom Surface ◽  
Highway Bridge ◽  
Reinforced Polymer ◽  
Nondestructive Testing Method ◽  
Polymer Laminates

This paper introduces the detection and evaluation results of a diseased highway bridge using nondestructive testing method according to Chinese specification. The bridge was firstly inspected to judge the apparent diseases of deck pavement and upper stuructures. The end-span prestressed concrete hollow slabs were detected by nondestructive testing for rebound strength and carbonation depth of concrete, corrosion and concrete cover of prestressed bars and cracks at bottom surface of the slabs. The synthetic judgement is given out based on the inspecting and testing results. Some measures are proposed for strengthening the bridge such as bonding steel plates and carbon fiber reinforced polymer laminates on the bottom surface of diseased slabs, recasting concrete of slab joints and renewing asphalt concrete of deck pavement.

Intensification of Open Gutters Operation

2020 ◽  
pp. 66-70
Keyword(s):  
Water Flow ◽  
Vortex Formation ◽  
Hydraulic Testing ◽  
Polymer Materials ◽  
Bottom Surface ◽  
Artificial Roughness ◽  
Transport Capacity ◽  
Corrugated Surfaces ◽  
Inner Surface ◽  
Dispersed Inclusions

The intensification of the work of open gutter by applying textured shells to their bottom surface, forming an artificial roughness, is considered. It is shown that the presence of corrugated surfaces contributes to vortex formation during water flow and improves the separation and transportation of mineral impurities previously dropped into the bottom of the gutters. The implementation of operations to improve the structure of the gutters is possible during the repair and restoration works with the use of modern polymer materials. The design of a small-sized hydraulic stand, which makes it possible to study the transport capacity of flows containing solid inclusions, is presented. The method of research is hydraulic testing, accompanied by the use of chiaroscuro effect, as well as photo and film equipment. The optimal structure of the inner surface of the gutters and pipes providing vortex formation, which will improve the ability of the flow to carry out and transport foreign dispersed inclusions (sand) of different granulometric compositions, is determined.

Anisotropic Plasma ChemicalVapor Deposition of Copper Films in Trenches

2003 ◽  
Vol 766 ◽  
Author(s):  
Kosuke Takenaka ◽  
Masao Onishi ◽  
Manabu Takenshita ◽  
Toshio Kinoshita ◽  
Kazunori Koga ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Deposition Rate ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Anisotropic Plasma ◽  
Bottom Surface ◽  
Chemical Vapor Deposition Method ◽  
Copper Films ◽  
Deposition Method ◽  
Via Holes

AbstractAn ion-assisted chemical vapor deposition method by which Cu is deposited preferentially from the bottom of trenches (anisotropic CVD) has been proposed in order to fill small via holes and trenches. By using Ar + H2 + C2H5OH[Cu(hfac)2] discharges with a ratio H2 / (H2 + Ar) = 83%, Cu is filled preferentially from the bottom of trenches without deposition on the sidewall and top surfaces. The deposition rate on the bottom surface of trenches is experimentally found to increase with decreasing its width.

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