Title:
Evaluation of Elastic Modulus for High-Strength Concrete
Author(s):
Hugues M. Vogel and Dagmar Svecova
Publication:
Materials Journal
Volume:
109
Issue:
3
Appears on pages(s):
313-322
Keywords:
elastic modulus; high-strength concrete; peak strain; Poisson’s ratio; stress-strain response.
DOI:
10.14359/51683821
Date:
5/1/2012
Abstract:
Recent advancements in the use of admixtures have gradually contributed to the commercial production of high-strength concrete (HSC). While compressive members exploit this advantage with savings in steel reinforcement, this paper presents the use of HSC in prestressed concrete prisms (PCPs) as an alternate reinforcing technique in concrete structures. The higher compressive strength increases the elastic modulus, which improves flexural rigidity and reduces deflection and crack width under service conditions. The lower chloride permeability of HSC can also protect reinforcement within the PCPs. The PCPs were prestressed with carbon fiber-reinforced polymer (CFRP) bars, and tests on standard cylindrical specimens revealed compressive strengths reaching 140 MPa (20.3 ksi) at 28 days. Mechanical properties required to establish the prestressing level and cracking load that optimize service conditions were also recorded during tests performed on standard specimens.