By Formerly Vice President of the Royal Academy of Engineering, Principal, Vice-Chancellor, University of Dundee Adam Neville
Adam Nevilles attractiveness as a global major professional on concrete expertise is unquestioned. during this, his ultimate ebook on concrete he? demonstrates the novel pondering that units him aside via incisive reflections and forecasts. commonplace books on concrete usually have an encyclopaedic process and continue from technology to perform yet this publication isn't general. the writer appears at an issue or a topic, and discusses the underlying medical and technological features, together with broader contextual subject matters. Adam Neville describes this as concrete during the incorrect finish of the telescope, which contributes to a greater figuring out of concrete perform and to higher concrete in perform.
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Extra info for Concrete: Neville's Insights and Issues
Furthermore, ASTM E 691 states in bold letters: ‘Under no circumstances should the final statement of precision of a test method be based on acceptance of test results for each material from fewer than 6 laboratories. ’ Admittedly, it is possible that in a country the size of Denmark there are not enough laboratories to satisfy the ASTM requirement but, if so, the test method should not be ‘exported’ to the European Union or to the USA. A curious feature of the interlaboratory test results of Jakobsen et al.
34 Water—cement ratio in hardened concrete An important limitation of the Nordtest method should be noted: it is applicable to well-hydrated concrete made with Ordinary Portland cement; it follows that other cementitious materials, whose use is nowadays very widespread, must not be included in the mix. Furthermore, there is a requirement for reference samples (standards) that should have the same degree of hydration and the same air void content as the concrete being tested. This is also a very important limitation because, unless proper reference samples are available, it is not possible simply to take a sample of hardened concrete, especially with an unknown curing and exposure history, test it by the Nordtest method, and report the w=c with useful precision.
37. 02 clearly fails. 05. , where it is said that ‘Table 5 shows some results of the round robin testing’ . 2. 02’ . First, the purpose of interlaboratory tests is to assess the performance of the laboratories involved. The ASTM E 691-87 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method is clearly relevant and also quite demanding. 2, gives information on the precision of testing but not on the bias of the results. Indeed, the input w=c, that is, the w=c of the concrete as batched is given in only four out of the seven annual test rounds.
Concrete: Neville's Insights and Issues by Formerly Vice President of the Royal Academy of Engineering, Principal, Vice-Chancellor, University of Dundee Adam Neville