Alkali-silica reactivity (ASR) can cause distributed
cracking and premature deterioration in concrete
structures. It is highly desirable to determine
whether impact-echo testing may be applied to
detect and quantify the amount of ASR damage in
concrete specimens. To address this issue, all
efforts were concentrated on monitoring the
evolution of ASR damage in concrete using
transient stress waves. Impact-echo testing was
applied on concrete specimens affected by ASR
and the corresponding results were analyzed to
test the parameters sensitive to ASR. In this study
two sets of experiments were used to accelerate
ASR in concrete. First, three reactive concrete
mixtures were cast using different percentages of
silicate aggregates. Concrete specimens were kept
at 80 °C (353.15 K) in a 1 mol–1 sodium hydroxide
(NaOH) solution. The results were obtained
through consequent tests over eight months. In
addition, other experiments were performed for
three different mixtures, which were synthesized
by using different types of silicate aggregates, as
well as one mixture including non-reactive aggregates.
All these mixtures were investigated six
months after fabrication, and these specimens
were kept at 38 °C (311.15 K) in a 1 mol–1 NaOH
solution. The applied technique, which is classified
as a nondestructive testing (NDT) technique based
on the impact-echo technique, may have the
capability to inspect the development of ASR in
concrete structures. Based on the observations in
this study, petrographic inspection confirms that
the damage was associated with ASR.
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