Influence of superplasticizers on the evolution of ultrasonic P-wave velocity through cement pastes at early age |
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| Affiliation: | 1. IGMAT Building Materials Institute, Polje 351c, 1000 Ljubljana, Slovenia;2. University of Ljubljana, Faculty of Civil and Geodetic Engineering, Jamova 2, 1000 Ljubljana, Slovenia;1. Civil and Environmental Engineering Department, Barcelona Tech, Polytechnic University of Catalonia, UPC, Jordi Girona 1–3, 08034 Barcelona, Spain;2. CAPES Foundation, Ministry of Education of Brazil, Brasília - DF, 70040-020, Brazil;3. Smart Engineering Ltd., Secretari Coloma 119, 08024 Barcelona, Spain;4. Institute of Physical and Information Technologies Leonardo Torres Quevedo (ITEFI), CSIC, C/Serrano 114, 28006 Madrid, Spain;5. Civil Construction Engineering Department, Polytechnic School of University of São Paulo, Professor Almeida Prado, Trav. 2, 83, 05424-970 São Paulo, Brazil |
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| Abstract: | The paper discusses a possibility of using an ultrasonic wave transmission method to study the influence of superplasticizers on the formation of structure of cement pastes at early ages. When compared to mixtures without additives, lower P-wave velocity was found through superplasticized cement pastes, indicating that superplasticizers prevent formation of a solid network frame. Comparing to sulfonate naphthalene-formaldehyde superplasticizers, polycarboxylate ether (PCE) admixtures retarded the solid network frame development more intensively, resulting in a plateau on a P-wave velocity curve during the setting period. The length of the plateau is proportional to the dosage of the PCE and inversely proportional to the specific surface area of the hydration products developed, proving that the specific surface area of a solid phase affects the performance of the PCEs. Validation of ultrasonic results was determined on the basis of the temperature evolution of the material in time. |
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