Title:
Underwater Adhesion of Polymethyl Methacrylate Concretes to Reinforcing Steel (Reinforcing Bars)
Author(s):
Muhammad A. R. Bhutta, Yoshihiko Ohama, and Katsunori Demura
Publication:
Materials Journal
Volume:
96
Issue:
1
Appears on pages(s):
90-94
Keywords:
binders (materials); bonding; reinforcing bars; rusting; underwater construction
DOI:
10.14359/433
Date:
1/1/1999
Abstract:
In this research work, polymethyl methacrylate (PMMA) concretes are prepared and tested for bond strength through the pullout of vertically- embedded reinforcing bars in PMMA concretes. The specimens are placed underwater at 20 C, and in air at 20 C and 50 percent relative humidity for 1, 3, 7, and 28 days. To improve the bond strength of PMMA concretes to the reinforcing bars embedded underwater, a silane coupling agent is added to PMMA binders. To prevent the formation of rust on the reinforcing bars and effectively improve the bond strength between PMMA concretes and reinforcing bars with the silane coupling agent in underwater construction work, the use of reinforcing bars coated by three types of processes is examined. As a result, a significant improvement in the bond strength between PMMA concretes and reinforcing bars with silane coupling agent embedded underwater is achieved. The coating of the reinforcing bars with a PMMA binder before PMMA concrete placement is recommended to prevent the formation of rust on reinforcing bars.