Publications Internationales

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Author: search.filters.author.Rendell, F.Subject: search.filters.subject.Durability

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    External corrosion to concrete sewers : a case study
    (2012) Oualit, M.; Jauberthie, R.; Rendell, F.; Melinge, Y.; Abadlia, Mohamed Tahar
    The aim of this study was to investigate the deterioration of concrete sewers and identify responsible factors; this investigation was a part of an ongoing asset evaluation for Rennes (France). The sewer studied was a 300 mm spun concrete pipe laid in 1992. Core samples (D 28 mm, L 40 mm) were taken from different areas of a pipe (invert, crown and side wall) and analysed to quantify the condition of the concrete and the extent of damage to the internal and external surface of the pipe. Physical and mechanical properties of the material were characterised. The depassivation of the concrete was measured by testing with a phenolphthalein solution. The study showed that in this particular case the external corrosion was extensive with minimal internal corrosion. It is proposed that the corrosion was possibly linked to the use of a contaminated backfill or organic acids in the ground water. Recommendations are proposed concerning the direction of future research
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    Action of seawater on the durability of concrete with marble powder addition
    (2012) Chaid, R.; Jauberthie, R.; Rendell, F.
    Sustainable development requires a balance between development of infrastructure and environmental protection. The challenge to the cement and concrete industry is to produce a durable concrete at a competitive cost having minimal environmental impact. Current standards allow the use of additions that improve the concrete's characteristics and/or specific properties. Industrial by-products such as blast furnace slag, fly ash and silica fume, due to their hydraulic or pozzolanic characteristics, are used widely in the manufacture of durable and high performance concretes. This study aims to optimise the use of marble powder, a finely ground waste product from the marble industry; it is proposed that this can be used as a partial cement replacement material. Concretes incorporating this addition, when designed, manufactured and used correctly, can provide superior performance to conventional Portland cement concrete; not only are the mechanical properties improved but also the material’s durability