By Mark G. Alexander, Hans-Dieter Beushausen, Frank Dehn, Pilate Moyo
Choice of papers targeting repairing, retaining, rehabilitating, and retrofitting of latest infrastructures to increase their existence and maximize fiscal go back. furthermore, structural functionality and fabric toughness are mentioned. Contributions are labeled (i) Concrete longevity points, (ii) overview of concrete buildings, and (iii) Concrete fix, rehabilitation and retrofitting. significant cognizance is relief to leading edge fabrics for sturdy concrete development, built-in provider existence modelling of strengthened concrete buildings, NDE/NDT and size strategies, fix equipment and fabrics, and structural strengthening and retrofitting options. For researchers and practioners in constitution and infrastructure engineering. Set of publication of abstracts (458 pp) and a searchable complete paper CD-ROM (1396 pp).
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Extra info for Concrete Repair, Rehabilitation and Retrofitting: 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR-2, 24-26 November 2008, Cape Town, South Africa
25 100 R23 T23 0 20 40 Figure 15. Result of acoustic tomography of a masonry specimen with two voids (missing bricks). Forward modeling: acoustic waves. Transmitter T and Receiver R every 5 cm. 7 g/cm³, Voids: v = 300 m/s, ρ = “1” g/cm³, Inversion: 5 × 5 cm grid size, modified velocity model, five iterations, curved rays. Figure 17. Top: Typical spectrum of cement measured under helium containing chlorine, the spectral lines are labelled. Bottom: Comparison of spectra of cement and aggregate. 6 nm.
However now we need to know if blended cements can be used in conditions of sulfate exposure and it becomes clear that the test methods established for Portland cement cannot be easily generalised to determine criteria for sulfate resistance of blended cements. Worse, when sulfate resisting cements with an excellent track record of performance in the face of exposure to sulfates are tested according to common tests, they often fail the acceptance criteria. Some other questions which arise are: SULFATE ATTACK • High levels of slag addition are known to give good sulfate resisting blends, but what is the threshold The degradation of concrete due to ingress of sulfate ions from the environment—so called “sulfate 11 level of slag needed, and how does this depend on the composition of the slag and cement • How is the formation of ettringite related to the expansions observed and can gypsum formation also produce expansion • What is the role of thaumasite formation in degradation due to sulfate ingress • How do additions of limestone affect resistance to sulfate attack.
Field Investigations Of High Performance Calcium Aluminate Mortar For Wastewater Applications” In Calcium Aluminate Cements. Proceeding of the Centenary Conference, Avignon, France, 30 June—2 July 2008, IHS BRE Press, 2008, 269–277. , Biogenic and chemical sulfuric acid corrosion of mortars, Journal of Materials in Civil Engineering/November 1999, 340–344. , Letourneux, R. “High Performance concretes from calcium aluminate cements”, Cem. Concr. Res. 29 (1999) 1215–1223. Concrete Repair, Rehabilitation and Retrofitting II – Alexander et al (eds) © 2009 Taylor & Francis Group, London, ISBN 978-0-415-46850-3 Advanced NDT methods for the assessment of concrete structures H.