SS10: Life-cycle maintenance strategies and performance evaluation for reinforced concrete structures located in the multi-hazardous environment

2014 ◽  
pp. 1597-1597
Keyword(s):  
Performance Evaluation ◽  
Life Cycle ◽  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Maintenance Strategies ◽  
And Performance

scholarly journals Performance evaluation of plastic spacers: proposal and development of evaluation methods

2016 ◽  
Vol 9 (6) ◽  
pp. 911-952
Author(s):  
M. F. F. Menna Barreto ◽  
◽  
A. P. Maran ◽  
D. C. C. Dal Molin ◽  
J. R. Masuero
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Concrete Structures ◽  
Concrete Cover ◽  
International Standards ◽  
Performance Criteria ◽  
Reinforced Concrete Structures ◽  
And Performance ◽  
Cover Thickness ◽  
Brazilian Standard

ABSTRACT The durability of reinforced concrete structures is highly dependent on the characteristics of the concrete cover to reinforcement and its thickness. The failure to obtain cover thickness is the factor with the largest influence on the premature corrosion of the reinforcement, which in turn is the main deterioration form of reinforced concrete structures. Studies indicate that the designed cover is not reached in the current constructions that adopt this structural solution, configuring a chronic, and not a sporadic problem. One of the observed causes for the failure in obtaining the minimum standardized cover is the incorrect use of spacers and the use of inadequate spacers. This is made more serious by the absence of a Brazilian standard to regulate the product and its use and, consequently, the absence of a quality certification from the responsible regulating agency. Focusing on spacers, requirements and performance criteria were proposed, in addition to methods for their assessment, with most being taken and adapted from international standards. Subsequently, some spacers available on the market were effectively tested according to the proposed methodology. No spacer model proved to be satisfactory according to the established performance approach. However, for each criteria and assessment methods proposed, there was, at least, one spacer model at the market which satisfied them, so it can be said that the criteria and methods are suitable for spacers performance evaluation. Faced with the performance diversity of the spacer models on offer, the need for a regulatory Brazilian standard for this product was confirmed in order to delimit the quality of spacers available on the market and to eliminate this variable as one of the causes for not obtaining the correct covering.

Reducing The Life Cycle Cost of Reinforced Concrete Structures by using Fiber in Concrete

2014 ◽  
Vol 4 (3) ◽  
pp. 1-9
Author(s):  
Badrinarayan Rath ◽  
◽  
Shirish Deo ◽  
Gangadhar Ramtekkar ◽  
◽  
...  
Keyword(s):  
Life Cycle ◽  
Reinforced Concrete ◽  
Life Cycle Cost ◽  
Concrete Structures ◽  
Reinforced Concrete Structures

Normative Service Life Of Concrete And Reinforced Concrete Structures And Principles Of Their Design Based On Durability Parameters

2019 ◽  
pp. 13-22
Keyword(s):  
Life Cycle ◽  
Reinforced Concrete ◽  
Service Life ◽  
Bearing Capacity ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Life Cycle Design ◽  
Determining Factors ◽  
Corrosion State ◽  
Standard Service

The paper systematizes the main criteria necessary to determine the standard service life of concrete and reinforced concrete structures; the state of domestic and foreign regulatory framework is analyzed in terms of requirements for the service life of reinforced concrete structures; the main normative and technical documents are considered in the field of life cycle design of reinforced concrete structures of buildings and constructions. The types of corrosion damages of reinforced concrete structures and their determining factors are described; the internationally agreed models of durability for some degradation processes are given. On the basis of the work carried out, proposals were prepared to assess the corrosion state of the exploited reinforced concrete structures, their residual bearing capacity, operational serviceability, expected service life under specified aggressive actions, and methods for determining the standard service life of reinforced concrete structures. Proposals for the development and updating of a number of relevant regulatory, technical, organizational and methodological documents are given.

scholarly journals Experimental evaluation of coupler behavior for mechanical rebar splices in reinforced concrete structures

2018 ◽  
Vol 11 (6) ◽  
pp. 1326-1353
Author(s):  
V. G. CHIARI ◽  
A. L. MORENO JUNIOR
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Structural Integrity ◽  
Test Procedure ◽  
Concrete Structures ◽  
Test Methods ◽  
Reinforced Concrete Structures ◽  
Steel Bars ◽  
Important Solution ◽  
Brazilian Standard

Abstract The use of mechanical splices to connect steel bars is an important solution in many infrastructure projects worldwide. In Brazil, this system is rarely used. The Brazilian standards regarding this subject are old and out of date; particularly with regard to the performance evaluation test methods for these splices in the laboratory. This paper presents and discusses the test procedure proposed in the international standard ISO 15835 [1] in light of the current procedure defined by Brazilian Standard ABNT NBR 8548 [2], applied to types of mechanical splices commonly used in Brazil: taper threaded and bolted couplers. Performance parameters for these mechanical splicing systems related to structural integrity in reinforced concrete structures are evaluated on the basis of the results obtained in these tests. In the end, it is intended that this paper provide support for discussion of design procedures and laboratory performance evaluation of couplers for mechanical splices of steel bars in reinforced concrete structures in future reviews of Brazilian standard ABNT NBR 8548 [2].

Sign in / Sign up

Export Citation Format

Share Document