Evaluation of In-place Concrete Strength by Near-to-surface Tests

• Autor(a) principal: Lopes, Sérgio Manuel Rodrigues
• Data de Publicação: 1998
• Outros Autores: Nepomuceno, Miguel
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.6/4552
• topic: Penetration Resistance test; Windsor Probe Test System; Pull-out test; Capo-test; Normal Strength Concrete; High Strength Concrete; In-place testing

The near-to-surface tests, as described by British Standard BS 1881: Part 207: 1992, comprises different techniques which were developed to evaluate in-situ strength of concrete, and it includes: internal fracture, pull-out, pull-off, penetration resistance and break-off tests. Since these tests measure only a property of concrete close to the surface, the evaluation of in-situ strength of concrete mass has to be obtain by a experimentally correlation between the near-to surface test results and the compressive strength of concrete mass. This paper discusses the reliability of two of this techniques, penetration resistance test and pull-out tests, as a construction tool for the evaluation of the in-place concrete strength both in normal and high strength concrete. For penetration resistance test applied to high-strength concrete an alternative firing apparatus to the standard apparatus, Windsor Probe Test System, is used. The obtained correlations are also presented and compared to those obtain by other research works.