Abstract
Ultrasonic wave reflection (UWR), well established for the study of stiffening and strength development of cement-based materials, normally uses shear waves (S-waves) because they are sensitive to microstructural development. This study demonstrates possible application of UWR with longitudinal waves (P-waves) using a low impedance buffer for investigating stiffening in hydrating cement paste. The P-wave reflection coefficient was seen to increase modestly as hydration progressed. Also, the P-wave reflection coefficient showed higher values for pastes with lower water to cement ratios, which are primarily attributed to the higher density of low w/c pastes, and similar effects with addition of fly ash and entrained air. Partial debonding between paste and buffer was observed in most pastes at a time that coincided with final set as measured using S-waves; and the debonding appears to be associated with the development of pore water under-pressure that occurs after solidification (due to chemical shrinkage).
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Chung, CW., Suraneni, P., Popovics, J.S. et al. Application of ultrasonic P-wave reflection to measure development of early-age cement-paste properties. Mater Struct 46, 987–997 (2013). https://doi.org/10.1617/s11527-012-9948-5
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DOI: https://doi.org/10.1617/s11527-012-9948-5