Abstract
This paper reports the experimental results obtained for the flexural crack behavior of partially prestressed concrete (PPC) beams manufactured with either the post-tensioning method or the pre-tensioning method. The beams were designed with various compressive strength of 100 N/mm2, 70 N/mm2, and 35 N/mm2. The bond performance between the concrete and the prestressing-steel strands or PC steel bars in post-tensioned PPC beams of various PC grout quality levels, including unbonded grout, and pre-tensioned PPC beams, was found to have a major influence on the flexural crack behavior of PPC beams. Further, with regard to the PPC beams that use high-strength concrete of 100 N/mm2 class, post-tensioned PPC beams filled with high-strength PC grout were found to exhibit more desirable flexural crack behavior than pre-tensioned PPC beams. This paper also touches upon the applicability of the flexural crack width calculation formulas given in the Standard Specifications for Concrete Structures of the Japan Society of Civil Engineers.
