Abstract
Cement-based repair materials are extensively used to rehabilitate damaged structures and extend their service life. However, these materials experience bond deterioration and strength loss during service. Traditional standardized test methods for bond determination are destructive and impose additional damage in parent structures. This paper presents findings of a unique study where a combination of force and acoustic sensors were used to determine the dynamic modulus of elasticity (Edyn), which reflects the interfacial deterioration and material damage. Flexural bond test and image analysis were performed to validate the results. The experimental study shows that the change in Edyn determined from non-destructive tests (NDTs) agree well with the change in other measurements including flexural bond strength (fr′), interfacial crack width, and mass loss after freeze-thaw exposure. Linear relationships are established between Edyn and fr′ for both cementitious and polymer-modified cementitious repair mortar with a coefficient of determination ranging from 0.87 to 0.95.
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