A new issue of the IBRACON Structures and Materials Journal (Volume 10 Number 4, August 2017) is now available, with ten articles approaching relevant topics on structural concrete. The issue begins with a paper on punching shear in prestressed slabs with unbonded tendons, designed according to Brazilian, European and American codes. Results according to four design codes show advantages in favor of European EC2:2004 and Brazilian NBR 6118:2014. The second paper describes ultrasonic pulse velocity experiments to evaluate effects of thermal and mechanical loading on the degradation of mortar mechanical properties. The next article presents a critical review of microstructural changes in concrete exposed to high temperature. In the fourth article, the corrosion potential technique is used as an electrochemical method to support monitoring of reinforcement corrosion in reinforced concrete structures. The aim is to evaluate some of the possible factors that influence corrosion potential measures, such as concrete moisture content, water-cement ratio, cover thickness and degree of chloride contamination. The fifth article summarizes experimental studies on the shear strength of reinforced slender self-compacted concrete beams, comparing with the shear strength of the corresponding vibrated concrete beams. The sixth article presents a series of test results of large-scale rectangular concrete-filled steel tubular beams to assess their performance under pure bending. Test results show that the concrete infilling enhanced flexural behavior and performance of the steel tubes. The seventh paper presents an evaluation of the strength compliance of concretes produced in Brazil. Results from more than twenty-seven thousand concrete samples, from different parts of the country, show that a significant part does not reach the characteristic strength specified in the design and that the percentage of nonconforming samples tends to be above 5%. The behavior of the block-grout interface for concrete and clay block masonry is the objective of the eighth article. The ninth paper proposes a simplified dynamic analysis methodology for studying vibrations in railway bridges produced by a typical passenger train. In the last paper, a literature survey examines material and mechanical properties of ultra high-performance fiber-reinforced concrete, a material with unique properties (high ductility, low permeability, very high strength capacity in compression, higher toughness) in comparison to conventional concrete.
We congratulate authors and reviewers for the quality of the articles published in this issue.
Publication Dates
-
Publication in this collection
Aug 2017
