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Abstract

New approach using direct crack width calculations of the minimum reinforcement in tensile RC elements is presented. Verification involves checking whether the provided reinforcement ensures that the crack width that may result from the thermal-shrinkage effects does not exceed the limit value. The Eurocode provisions were enriched with addendums derived from the German national annex. Three levels of accuracy of the analysis were defined - the higher the level applied, the more significant reduction in the amount of reinforcement required can be achieved. A methodology of determining the minimum reinforcement for crack width control on the example of a RC retaining wall is presented. In the analysis the influence of residual and restraint stresses caused by hydration heat release and shrinkage was considered.

REFERENCES ACI Committee 207 (2007) ACI 207.2R-07: Report on thermal and volume change on cracking pf mass concrete. American Concrete Institute, 28 pp., Farmington Hills, MI. Bamforth, P. B. (2007) Early-age thermal crack control in concrete . CIRIA C660, London. Bamforth, P. – Denton, S. – Shave, J. (2010) The development of a revised unified approach for the design of reinforcement to control cracking in concrete resulting from restrained contraction . ICE Research Project 0706, 67 pp. EN 13670 CEN (2004) Execution of concrete structures , 64 pp., Brussels

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: principle of “resist and release” for alternative bay construction method cracking control of super longmass concrete”, China Architecture & Building Press, Beijing, 2007. 20. N. Q. Feng, Q. X. Gu, T. Y. Hao, “Cracking in concrete structure and its counter measures”, China Machine Press, Beijing, 2006. 21. S. L. Xu, N. Wang, X. F. Zhang, “Flexural behavior of plain concrete beams strengthened with ultra high toughness cementitious composites layer”, Materials and Structures, 45: 851–859, 2012. 22. Qinghua Li, Shilang Xu, “Experimental Research on Mechanical Performance of

References ACI 207.2R-07 (2007) Report on Thermal and Volume Change Effects on Cracking of Mass Concrete . ACI Committee 207, 28 pp. ACI 224.2R-92 (ACI 2004) Cracking of Concrete Members in Direct Tension . ACI Committee 224, 12 pp. Bamforth, P.B. (2007) Early-age thermal crack control in concrete . CIRIA C660, London, 112 pp. Becker, A. (2009) Waterproof Concrete Tanks . Tiefbau 3, pp. 153–161 Bobko, C.P. - Edwards, A.J., Seracino, R. and Zia, P. (2015) Thermal Cracking of Mass Concrete Bridge Footings in Coastal Environments . Journal of Performance of