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Publisher: Institution of Civil Engineers
Languages: English
Types: Article
Subjects:
This paper presents the results of field monitoring of repair patches in two reinforced concrete highway bridges, Lawns Lane Bridge on the M1 and Gunthorpe Bridge across the River Trent. The repairs were applied by spraying (guniting) repair materials to compression members of the bridges. The structural members were unpropped during repair and throughout the 60 week monitoring period. The strains in the repair patches were monitored with vibrating-wire gauges. Four different repair materials were investigated whose elastic modulus was greater than that of the substrate concrete (E-rm > E-sub). The results show that efficient repairs are achieved with E-rm> E-sub, the optimum relationship being E-rm > 1.3E(sub). This enables the repair material to shed a significant proportion of its shrinkage strain to the substrate, thereby reducing restrained-shrinkage tension. It also enables the repair to attract externally applied load from the substrate in the long term. The effect of creep and shrinkage on the performance of the repair patch is also determined. Overall, the results show that current repair standards have limitations with respect to repair material specifications.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • 1. Department of Transport. Materials for the Repair of Concrete Highway Structures. DoT, London, 1986, BD27/86.
    • 2. Emmons P. H. and Vaysburd A. M. Performance Criteria for Concrete Repair Materials, Phase 1. US Army Corps of Engineers, Technical Report, in press.
    • 3. Emmons P. H. and Vaysburd A. M. A total system conceptÐ necessary for improving the performance of repaired structures. Concrete International, 1995, Mar., 31±36:
    • 4. Mangat P. S. and Limbachiya M. K. Repair materials properties which influence long-term performance of concrete structures. Construction and Building Materials, 1995, 9, No. 2, 81±90:
    • 5. Mangat P. S. and Limbachiya M. K. Repair material properties for effective structural application. Cement and Concrete Research, 1997, 27, No. 4, 601±617.
    • 6. Mangat P. S. and O'Flaherty F. J. Long-term performance criteria for concrete repair materials. Keynote paper. International Congress on Creating with Concrete. Dundee, 1999.
    • 7. Emberson N. K. and Mays G. C. Significance of property mismatch in the patch repair of concrete. Part 3: reinforced concrete members in flexure. Magazine of Concrete Research, 1996, 48, No. 174, 45±57.
    • 8. Mangat P. S. and O'Flaherty F. J. Influence of elastic modulus on stress redistribution and cracking in repair patches. Cement and Concrete Research, in press.
    • 9. Plum D. R. Repair materials and repaired structures in a varying environment. Proceedings of the 3rd International Seminar on the Life of StructuresÐthe Role of Physical Testing, Brighton, 1989, 77±84.
    • 10. Rizzo E. M. and Sobelman M. B. Selection criteria for concrete repair materials. Concrete International, 1989, Sept., 46±49.
    • 11. British Standards Institution. Method for Determination of Static Modulus of Elasticity in Compression. BSI, Milton Keynes, 1983, BS 1881: Part 121.
    • 12. British Standards Institution. Method for Determination of Compressive Strength of Concrete Cubes. BSI, Milton Keynes. 1983, BS 1881: Part 116.
    • 13. Pinelle D. J. Curing stresses in polymer modified repair mortars. Cement, Concrete and Aggregates, CCAGDP, 1995, 17, No. 2, 195±200.
    • 14. Kong F. K. and Evans R. H. Reinforced and Prestressed Concrete. Van Nostrand Reinhold, 3rd edn, Wokingham, 1987.
    • 15. O'Flaherty F. J. Long Term Performance of Concrete Repair in Highway Structures. PhD thesis, Sheffield Hallam University, 1998.
    • 16. Dector M. H. and Lambe R. W. New materials for concrete repairÐdevelopment and testing. Indian Concrete Journal, 1993, Oct., 475±480:
    • 17. Emberson N. K. and Mays G. C. Significance of property mismatch in the patch repair of structural concrete. Part 1: properties of the repair system. Magazine of Concrete Research, 1990, 42, No. 152, 147±160.
    • 18. Wood J. G. M., King E. S. and Leek D. S. Defining the properties of concrete repair materials for effective structural application. International Conference on Structural Faults and Repair89. London, 1989, p. 2.
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  • Discovered through pilot similarity algorithms. Send us your feedback.

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