01551953

Component

Alkali-silica reaction (ASR) is a distributed and expansive damage mechanism that can lead to deterioration of concrete structures. Assessing the extent of damage induced by the ASR in concrete is needed to evaluate the condition of the existing concrete structures. Besides the conventional destructive methods, nondestructive testing (NDT) methods have been utilized to evaluate the condition of concrete structures affected by ASR. Among the NDT methods, surface wave methods have received comparatively little attention for assessing ASR damage. Since surface waves are influenced by near-surface condition of the concrete, surface wave methods might be useful in detecting and quantifying the extent of damage induced by ASR, such as surface cracking. Two sets of small-scale experiments were carried out to evaluate the applicability of the ultrasonic surface wave (USW) method in assessing the extent of the ASR damage, mapping the ASR-induced surface cracks and estimating depth of cracks. The results from these experiments demonstrate that the measured elastic modulus of concrete decreases with an increase in the expansion of ASR-affected specimens. In spite of relatively constant moduli through the entire non-reactive specimens, the presence of crack in the ASR-affected specimens is indicated as an area with low modulus. The location and depth of cracks are estimated well with the USW method.

This paper was sponsored by TRB committee AHD30 Structures Maintenance.

01550057

15-2311

English

15p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; References; Tables

Alkali silica reactions; Concrete structures; Cracking; Feasibility analysis; Modulus of elasticity; Nondestructive tests; Ultrasonic waves

Bridges and other structures; Highways; Maintenance and Preservation; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2015 Paper #15-2311

TRIS, TRB, ATRI

Dec 30 2014 12:49PM