Monitoring of ultrasonic velocity in concrete specimens during compressive loading-unloading cycles

Author(s)

Lima Gondim, Rafaella Moreira ^[1] ; Haach, Vladimir Guilherme ^[1]

Affiliation

^[1] Univ Sao Paulo, Sch Engn Sao Carlos, Av Trabalhador Saocarlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 302, OCT 4 2021.
• Web of Science Citations: 0

Abstract

Concrete structures are constantly subjected to cracks and stress variations due to the cyclic nature of actions, which lead to opposite effects in the wave propagation velocities. This manuscript investigates the joint effect of acoustoelasticity and damage on two concrete prisms subjected to compressive loading-unloading cycles up to the limit of 75% of the compressive strength. Ultrasonic pulse velocity tests were performed through the emission of longitudinal and transversal waves propagated in the direction of loading, and A-scans were recorded at several load steps during the unloading of each cycle. The results show the relative velocity variations (Delta V/V0) caused by the damage and acoustoelastic effect have similar magnitudes, but in opposite ways. The heterogeneous and brittle behavior of concrete leads to a high dispersion in the velocity results caused by the damage during compressive loading-unloading cycles. The use of the damage state as a reference for the calculus of Delta V/ V0 reduced such a dispersion and increased velocity for higher compressive stresses. (AU)

• FAPESP's process: 17/24096-8 - Investigation of the acoustoelastic effect in structural masonry elements of concrete blocks
• Grantee: Rafaella Moreira Lima Gondim
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/24446-6 - ASSESSMENTO ON THE DAMAGE AND STRESS STATE OF CONCRETE ELEMENTS USING ULTRASONIC MEASUREMENTS
• Grantee: Vladimir Guilherme Haach
• Support Opportunities: Regular Research Grants