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<p>This study aims to document the technical evolution of concrete through micro and macrostructural characterizations of buildings constructed between the 1960s and 2020s. The investigation was conducted in two Brazilian cities: Juiz de Fora (inland) and Fortaleza (coastal). For each decade, four core samples were extracted—two tested for compressive strength and two analyzed for coarse aggregate size, petrographic analysis, UPV, carbonation depth, chloride content, XRD, and TG/DTA. General trends, such as a reduction in aggregate size and increased use of mineral admixtures in cement, were observed. The properties evaluated were influenced by environmental conditions, workmanship quality, materials used, and coating quality, complicating the development of dating protocols. A key finding was the significant impact of coating quality on the long-term durability of concrete. Despite these challenges, the study successfully established a comprehensive database of the mechanical, mineralogical, chemical, and physical properties of concretes produced from the 1960s to the 2020s, providing an initial archive of this material’s evolution for researchers in Brazil and worldwide.</p>

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Technical evolution of concrete in Brazil: a six-decade study (1960s–2020s)

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Juliana Fadini Natalli,
  • Laís Cristina Barbosa Costa,
  • Julia Castro Mendes,
  • Marina Altoé Caetano,
  • Paulo Ricardo de Matos,
  • Alexandre Araújo Bertini,
  • Ricardo André Fiorotti Peixoto

摘要

This study aims to document the technical evolution of concrete through micro and macrostructural characterizations of buildings constructed between the 1960s and 2020s. The investigation was conducted in two Brazilian cities: Juiz de Fora (inland) and Fortaleza (coastal). For each decade, four core samples were extracted—two tested for compressive strength and two analyzed for coarse aggregate size, petrographic analysis, UPV, carbonation depth, chloride content, XRD, and TG/DTA. General trends, such as a reduction in aggregate size and increased use of mineral admixtures in cement, were observed. The properties evaluated were influenced by environmental conditions, workmanship quality, materials used, and coating quality, complicating the development of dating protocols. A key finding was the significant impact of coating quality on the long-term durability of concrete. Despite these challenges, the study successfully established a comprehensive database of the mechanical, mineralogical, chemical, and physical properties of concretes produced from the 1960s to the 2020s, providing an initial archive of this material’s evolution for researchers in Brazil and worldwide.