Mechanical Properties of Concrete and Reinforcement

Abstract

Sub-working group 1 of the Japan Concrete Institute (JCI) committee on Utilization of High-Strength Concrete (HSC) and High-Performance Concrete (HPC) (JCI-TC063A) has been working on collecting information from research on HSC and HPC as well as their practical use. The committee published a report in 2006 in Japanese. The objective of the report is to present state-of-the-art information on concrete with strengths in excess of about 60 MPa and high-strength steel reinforcement such as prestressing steel, excluding concrete made with atypical materials, such as fibers, or uncommon techniques. It primarily addresses the mechanical properties of high-strength concrete and high-strength steel reinforcement. A concise digest of the report has already been published as a keynote paper in the proceedings of 8th International Symposium on Utilization of HSC and HPC in October 2008 in Tokyo. This paper is based on the keynote paper with additional information on High Strength Steel, HSS, reinforcing bars in Japan.

Prediction of autogenous shrinkage in concrete from material composition or strength calibrated by a large database, as update to model B4

“…For this reason, the autogenous shrinkage has usually been neglected by designers [3]. But with increasing use of high strength concretes (HSC) and high performance concretes (HPC), which have a low water-cement ratio, the drop in relative humidity is significant (even by [ 30%), and thus correct estimation of autogenous shrinkage becomes important [12,31].…”

Bar continuity and strain compatibility for high-strength steel reinforcement in reinforced concrete structures

“…A total of 181 concentric compression tests on RC columns from literatures (Saatcioglu and Razvi, 1998; Razvi and Saatcioglu, 1999; Sener et al, 2004; Sharma et al, 2005; Sugano et al, 2007; Malik and Foster, 2008; Cetisli and Naito, 2009; Nishiyama, 2009; Paultre et al, 2010; Abe et al, 2011; Shin et al, 2015; Jin et al, 2016; Li et al, 2018; BC5, 2019; Aboukifa and Moustafa, 2021; Ding et al, 2022) are compiled. The main variables considered in these studies include the following:1.…”

Simplified Design Equation of Minimum Interior Joint Depth for Special Moment Frames with High-Strength Reinforcement

“…On the other hand, Grade 490 or 500 MPa reinforcement has been widely used as primary reinforcement of earthquake-resistant concrete structures in Japan (AIJ 2010), Taiwan (Ministry of the Interior 2017), and New Zealand (NZS 3101 2006). Even higher Grade 590 and 690 MPa reinforcement can be used in high-rise buildings with peer review and special approval in Japan (Aoyama 2001;Nishiyama 2009). Whenever a higher grade reinforcement is used, the anchorage at a beam-column joint become a critical issue.…”