Effect of Power Ultrasound on the Portland cement paste and mortar: study of chemical shrinkage and compressive and flexural strength development

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Abstract

Application of Power ultrasound (PUS) to the Portland cement mortar is the subject of this study to improve the kinetics of hydration and mechanical properties. The present work investigates the effect of direct PUS with various frequencies and power to the Portland cement paste and mortar mixtures. In regards to the mortars, two scenarios for PUS application were studied: 1) ultrasound treatment of the whole mortar mixtures and 2) addition of aggregates to the ultrasound-treated paste. The chemical shrinkages of cement paste mixes were measured over 14 days by developing an automated set up and using the image analysis technique. The mechanical properties of hardened mortar prisms were evaluated by studying the compressive and flexural strength development up to 91 days. The results show that lower frequency-high power PUS slightly changes the chemical shrinkage behaviour of cement pastes. The mechanical properties of mortars with the paste treated with the same PUS characteristic showed significant improvement in flexural strength both in early age and long term. The SEM micrographs of fracture surfaces confirmed improved interfacial transition zone between aggregates and cement paste in mortar samples.Application of Power ultrasound (PUS) to the Portland cement mortar is the subject of this study to improve the kinetics of hydration and mechanical properties. The present work investigates the effect of direct PUS with various frequencies and power to the Portland cement paste and mortar mixtures. In regards to the mortars, two scenarios for PUS application were studied: 1) ultrasound treatment of the whole mortar mixtures and 2) addition of aggregates to the ultrasound-treated paste. The chemical shrinkages of cement paste mixes were measured over 14 days by developing an automated set up and using the image analysis technique. The mechanical properties of hardened mortar prisms were evaluated by studying the compressive and flexural strength development up to 91 days. The results show that lower frequency-high power PUS slightly changes the chemical shrinkage behaviour of cement pastes. The mechanical properties of mortars with the paste treated with the same PUS characteristic showed significant improvement in flexural strength both in early age and long term. The SEM micrographs of fracture surfaces confirmed improved interfacial transition zone between aggregates and cement paste in mortar samples.
Original languageEnglish
Publication statusPublished - Sep 2020
Event74th RILEM Annual Week and 40th Cement and Concrete Science Conference - Sheffield, United Kingdom
Duration: 31 Aug 20204 Sep 2020
https://www.sheffield.ac.uk/materials/rilem2020

Conference

Conference74th RILEM Annual Week and 40th Cement and Concrete Science Conference
CountryUnited Kingdom
CitySheffield
Period31/08/204/09/20
Internet address

Bibliographical note

Conference Programme and Book of Abstracts available to Conference Delegates at: https://www.sheffield.ac.uk/materials/rilem2020/programme

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    Ehsani, A., Ganjian, E., Haas, O., Tyrer, M., & Mason, T. (2020). Effect of Power Ultrasound on the Portland cement paste and mortar: study of chemical shrinkage and compressive and flexural strength development. Paper presented at 74th RILEM Annual Week and 40th Cement and Concrete Science Conference, Sheffield, United Kingdom.