By H. Hilsdorf, J. Kropp
This can be a cutting-edge record ready by means of RILEM Technical Committee 116-PCD and is an authoritative, foreign evaluation of the topic and is an important reference resource for engineers and technologists. functionality standards for Concrete longevity explains key points of concrete longevity, and the relationships among shipping mechanisms and urban longevity features. It experiences attempt tools for measuring permeability within the laboratory and on website, and discusses the numerous components which effect the sturdiness of concrete to carbonation, chlorides, abrasion and so forth.
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Additional info for Performance Criteria for Concrete Durability (Rilem Report, No 12)
2], in which the cement content is certainly varying with the maximum aggregate size. 6], The permeability of normal and lightweight mortars (prepared at a constant water/cement ratio) is varying with the aggregate volume concentration as shown in Fig. 3. Nyame concludes as follows: • At increasing aggregate volume concentrations, interfacial effects increase the permeability, whilst absorption of paste water by the aggregate reduces the permeability of mortars. 24 PARAMETERS INFLUENCING TRANSPORT CHARACTERISTICS Fig.
4. 5. 6. 7. 8. 9. J. (1990) Permeability, diffusivity, and microstructural parameters: A critical review. Cement and Concrete Research, Vol. 20, No. 4, pp. 591–601. Gaber, K. (1988) Influence of mix proportions and components on the diffusion coefficient and the permeability of concrete. Darmstadt Concrete, 3, pp. 39–48. Kropp, J. (1983) Karbonatisierung und Transportvorgänge in Zementstein. Dissertation Universität Karlsruhe. -O. (1980) Hygroscopic moisture in concrete—drying, measurements and related material properties, TVBM-1003, Lund Institute of Technology.
15. Grube, H. and Rechenberg, W. (1987) Betonabtrag durch chemisch angreifende saure Wässer. Beton, Vol. 37, No. 11, pp. 446–51 and No. 12, pp. 495–8. 16. W. (1978) Physical Chemistry, Oxford University Press. 17. Brodersen, A. (1982) Zur Abhängigkeit der Transportvor-gänge verschiedener Ionen im Beton von Struktur und Zusammensetzung des Zementsteins. 18. Ushiyama, H. and Goto, S. (1974) Diffusion of various ions in hardened Portland cement paste, in Proc. 6th Intl. Congress on Chemistry of Cement, Moscow, Vol.