Assessment of Markham Bridge Concrete Deck’s Health by Schmidt Hammer T est

Abstract

This paper strives to assess the current health condition of the concrete of the bridge deck of Markham bridge of Papua New Guinea (PNG). The existing quality of concrete is tested through non- destructive testing (NDT) method. Schmidt hammer is used to assess the health condition. Vertical values were used for calculation of the in-situ compressive strength of concrete at 24 locations spanning along the entire length and breadth of the bridge deck. The compressive strengths at various locations related to the surface hardness based on empirical and statistical approach were calculated. The current quality of concrete in most of the locations is typically fair, not good. At one location, the compressive strength is calculated to be 18 MPa which is not acceptable for reinforced concrete construction and indicates need of immediate attention of the authority for pre-emptive measures to protect the bridge from further deterioration and untoward event in future. The School of Civil Engineering may be engaged with the Department of Works and Highways (DOWH) of PNG for more rigorous studies on the rehabilitation or replacement issues with the cost escalation for this purpose.