Recent Developments in Inspection Techniques for Corrosion Damaged Concrete Structures

2009 ◽  
pp. 246-246-12 ◽  
Author(s):  
G John ◽  
K Hladky ◽  
P Gaydecki ◽  
J Dawson
Keyword(s):  
Concrete Structures ◽  
Recent Developments ◽  
Inspection Techniques

Le béton projeté : nouveaux développements et applications

2000 ◽  
Vol 27 (2) ◽  
pp. 383-388 ◽  
Author(s):  
Marc Jolin ◽  
Pierre Lacombe
Keyword(s):  
Civil Engineering ◽  
Setting Time ◽  
Concrete Structures ◽  
Concrete Repair ◽  
Basic Principles ◽  
Dry Process ◽  
Air Content ◽  
The Third ◽  
General Rules ◽  
Recent Developments

This paper presents the most recent developments in shotcrete technology obtained in the last 5 years through the "Industrial Chair on Shotcrete and Concrete Repair" hosted at Laval University. The main goal of this paper is to inform those involved in the construction and repair of civil engineering concrete structures of the various possibilities of "shotcrete." The two first sections present the basic principles in pneumatic application of concrete along with the two processes in shotcrete technology, the dry-mix and wet-mix. The advantages of both processes as well as the general rules to follow in a shotcrete application are also presented and explained. The third and last section, the most important, highlights the latest developments in shotcrete technology. These developments concern the use of set accelerating admixtures in dry process shotcrete and their effects on the durability of materials, the use of liquid and powdered air-entraining admixtures in dry-mix shotcrete as well as the concept of "high initial air content" in wet mix shotcrete.Key words: shotcrete, set accelerator, air-entraining admixture, durability, setting time.

scholarly journals New Flaws for Qualification of Cast Stainless Steel Inspection

2012 ◽  
Author(s):  
Iikka Virkkunen ◽  
Doug Kull ◽  
Mika Kemppainen
Keyword(s):  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Austenitic Stainless Steels ◽  
Parent Material ◽  
Cast Material ◽  
Recent Developments ◽  
Manufacturing Techniques ◽  
Thermal Fatigue Cracks ◽  
Inspection Techniques ◽  
Cast Stainless Steel

For decades, cast austenitic stainless steels (CASS) have presented a challenge for inspection. However, recent advanced inspection technologies have shown promise in inspecting CASS materials with wall thicknesses that were once considered impossible. Before being applied on larger scale, these new inspection methods must be proven to be effective at identifying discontinuities in CASS material. This presents a problem of its own. Several traditional flaw manufacturing methods cannot be applied to CASS due to the disruption of the parent material. Excavation and welding changes the cast material microstructure and thus significantly affects the inspection results. At the same time, due to the significant wall thickness and inspection limitations, the required qualification flaws can be quite large. Until recently, modern flaw manufacturing techniques, that do not require welding, have not been applied to flaws of this size. In this paper, recent developments will be presented on the manufacturing of thermal fatigue cracks in centrifically CASS material. The presented developments make it possible to use real cracks for demonstrating the effectiveness of CASS inspection techniques. The results also contain first published UT data on this kind of thermal fatigue cracks in CASS and reveal new insight on the inspectability of this difficult material.

The effects of seawater on the integrity of offshore structures

1978 ◽  
Vol 76 (1-3) ◽  
pp. 95-114
Author(s):  
T. Hodgkiess
Keyword(s):  
Corrosion Fatigue ◽  
Concrete Structures ◽  
Steel Structures ◽  
Offshore Structures ◽  
Internal Environment ◽  
The North ◽  
Recent Developments ◽  
The North Sea ◽  
Corrosion Mechanisms ◽  
Basic Features

SynopsisThis paper reviews the knowledge of deterioration processes which occur when steel and concrete structures are situated in seawater. The basic corrosion mechanisms of steel, together with possible methods of protection, are outlined briefly. With regard to coatings and cathodic protection, recent developments to counteract the increasingly severe conditions encountered by oil-production platforms in the North Sea, are discussed. Concrete structures usually provide a naturally-inhibitive internal environment to confer protection from corrosion to encased steel reinforcements, but mention is made of the possibilities of such protection becoming ineffective during long service in severe offshore conditions.The basic features of corrosion fatigue are described in the light of recent research but some aspects, which are of great importance for the performance of steel structures, are shown to be not well documented or understood. Corrosion fatigue of concrete structures has not been studied extensively, a particularly neglected area being the elucidation of the fundamental mechanisms of deterioration.

scholarly journals Recent Developments of FRP Bars as Internal Reinforcement in Concrete Structures & Field Applications

◽  
2016 ◽  
Author(s):  
Brahim Benmokrane ◽  
◽  
Hamdy Mohamed ◽  
Ehab Ahmed ◽  
◽  
...  
Keyword(s):  
Concrete Structures ◽  
Recent Developments ◽  
Frp Bars
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