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<p>The aim of the present research was to empirically prove that the non-destructive ultrasonic direct method is an effective scientific tool for measuring the maturity of polymer concretes (PC). Maturity is understood as obtaining a stabilised, maximally homogeneous, and dense microstructure of the composite, which is closely related to its mechanical strength. The direct ultrasonic method was used to assess the homogeneity, and thus the quality, of the microstructure of the composites shortly (14&#xa0;days) after production and after 9 and/or 9.5&#xa0;years. Different values of the ultrasonic pulse velocity were computed for "young" and several-year-old composites of identical compositions. This study confirmed the authors’ thesis that particular types of PC (with vinyl-ester matrix saturated with finely ground rocks and fossil fuel combustion by-products) show maturation extended up to several years and an additional increase in mechanical strength, despite the long-standing widespread view that polymer concretes obtain their full potential within several days. This indicates the necessity of a thorough examination of the microfiller morphology before its application in PC because it may affect the curing process and strength development. This leads to the second conclusion, that the design rules for PC with microfillers with more developed specific surface areas should be revised because the designed values may be underestimated in relation to the actual values but obtained after a longer time.</p> Graphical abstract <p></p>

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Measuring of the polymer concrete maturity using non-destructive ultrasonic method

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月1日

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  • Joanna Julia Sokołowska,
  • Kamil Załęgowski,
  • Lech Czarnecki

摘要

The aim of the present research was to empirically prove that the non-destructive ultrasonic direct method is an effective scientific tool for measuring the maturity of polymer concretes (PC). Maturity is understood as obtaining a stabilised, maximally homogeneous, and dense microstructure of the composite, which is closely related to its mechanical strength. The direct ultrasonic method was used to assess the homogeneity, and thus the quality, of the microstructure of the composites shortly (14 days) after production and after 9 and/or 9.5 years. Different values of the ultrasonic pulse velocity were computed for "young" and several-year-old composites of identical compositions. This study confirmed the authors’ thesis that particular types of PC (with vinyl-ester matrix saturated with finely ground rocks and fossil fuel combustion by-products) show maturation extended up to several years and an additional increase in mechanical strength, despite the long-standing widespread view that polymer concretes obtain their full potential within several days. This indicates the necessity of a thorough examination of the microfiller morphology before its application in PC because it may affect the curing process and strength development. This leads to the second conclusion, that the design rules for PC with microfillers with more developed specific surface areas should be revised because the designed values may be underestimated in relation to the actual values but obtained after a longer time.

Graphical abstract