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http://dx.doi.org/10.12989/sem.2014.52.4.701

Assessment of concrete degradation in existing structures: a practical procedure  

Porco, Francesco (DICATECh)
Uva, Giuseppina (DICATECh)
Fiore, Andrea (DICATECh)
Mezzina, Mauro (DICATECh)
Publication Information
Structural Engineering and Mechanics / v.52, no.4, 2014 , pp. 701-721 More about this Journal
Abstract
In the assessment of existing RC buildings, the reliable appraisal of the compressive strength of in-situ concrete is a fundamental step. Unfortunately, the data that can be obtained by the available testing methods are typically affected by a high level of uncertainty. Moreover, in order to derive indications about the degradation and ageing of the materials by on site tests, it is necessary to have the proper terms of comparison, that is to say, to know the reference data measured during the construction phases, that are often unavailable when the building is old. In the cases when such a comparison can be done, the in situ strength values typically turn out to be lower than the reference strength values (tests performed on taken samples during the construction). At this point, it is crucial to discern and quantify the specific effect induced by different factors: ageing of the materials; poor quality of the placement, consolidation or cure of the concrete during the construction phases; damage due to drilling. This paper presents a procedure for correlating the destructive compressive tests and non-destructive tests (ultrasonic pulse velocity tests) with the data documenting the compressive strength tested during the construction phases. The research work is aimed at identifying the factors that induce the difference between the in-situ strength and cubes taken from the concrete casting, and providing, so, useful information for the assessment procedure of the building.
Keywords
existing RC buildings; in-situ strength of concrete; compressive strength; seismic assessment; core drilling; structural safety; compaction degree; concrete; ultrasonic pulse velocity method; concrete degradation;
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  • Reference
1 ACI 214.4R-03 (2003), Guide for Obtaining Cores and Interpreting Compressive Strength Results, American Concrete Institute, Detroit, USA.
2 ACI 228.2R-98 (1998), Non destructive Test Methods for Evaluation of Concrete in Structures, American Concrete Institute, Detroit, USA.
3 Arioz, O., Tuncan, M., Ramyar, K. and Tuncan, A. (2006), "A comparative study on the interpretation of concrete core strength results", Mag. Concrete Res., 58(2), 117-22.   DOI   ScienceOn
4 ASTM Committee C 597-02 (2002), Standard Test Method for Pulse Velocity Through Concrete, American Society for Testing and Materials, Philadelphia, USA.
5 ASTM Committee C09.61 (1992), Standard test method for obtaining and testing drilled cores and sawed beams of concrete (ASTM C42-90), Annual Book of ASTM Standards, American Society for Testing and materials. Philadelphia, USA.
6 Bartlett, F.M. and MacGregor, J.G. (1994a), "Effect of core diameter on concrete core strengths", ACI Mater. J., 91(5), 460-470.
7 Bartlett, F.M. and MacGregor, J.G. (1994b), "Effect of core length to diameter ratio on concrete core strength", ACI Mater. J., 91(4), 339-348.
8 Bartlett, F.M. and MacGregor, J.G. (1994c), "Effect of moisture condition on concrete core strengths", ACI Mater. J., 91(3), 227-236.
9 Bartlett, F.M. and MacGregor, J.G. (1999), "Variation of in-place concrete strength", ACI Mater. J., 96(2), 261-70.
10 Bloem, D.L. (1965), "Concrete strength measurement- cores versus cylinders", Am. Soc. Test. Mater., 56, 668-696.
11 Bloem, D.L. (1968), "Concrete strength in structures", ACI J. Pr., 65(3), 176-187.
12 British Standard n.1881 (1983), Part 120, Method for Determination of Compressive Strength of Concrete Cores,British Standard Institute, U.K.
13 C.S.LL.PP. (2008), Norme tecniche per le costruzioni, D.M. 14/01/2008, Gazzetta Ufficiale della Repubblica Italiana n. 29-2008, Roma. (In Italian)
14 C.S.LL.PP. (2009), Istruzioni per l'applicazione delle "Nuove norme tecniche per le costruzioni" di cui al Decreto Ministeriale 14 gennaio 2008, Circolare Ministeriale 2 febbraio 2009, n. 617, Consiglio Superiore dei Lavori Pubblici, Roma. (in Italian)
15 Campbell, R.H. and Tobin, R.E. (1967), "Core and cylinder strengths of natural and lightweight concrete" ACI J. Pr., 64(4),190-195.
16 CEN (2005a), Eurocode 2: Design of concrete structures, Part 1-1: General rules and rules for buildings, European Committee for Standardization, Brussels, Belgium.
17 FEMA 274, (1997), NEHRP Commentary on the Guidelines for the Seismic Rehabilitation of Buildings, Federal Emergency Management Agency, Washington D.C. USA.
18 CEN (2005b), Eurocode 8: Design of structures for earthquake resistance, Part 3: Assessment and retrofitting of buildings, European Committee for Standardization Brussels, Belgium.
19 Collepardi, M. (2010), The new concrete, Edizioni Tintoretto, Villarba, Italy.
20 Dolce, M., Masi, A. and Ferrini, M. (2006). "Estimation of the actual in-place concrete strength in assessing existing RC structures", Proceedings of 2nd International fib Congress, Naples, June.
21 Fiore, A., Porco, F., Uva, G. and Mezzina, M. (2013), "On the dispersion of data collected by in situ diagnostic of the existing concrete", Construct. Build. Mater., 47, 208-217.   DOI
22 Halstead, P.E. (1969), "The significance of concrete cube tests", Mag. Concrete Res., 21(69), 187-194.   DOI
23 Lewis, R.K. (1976), "Effect of core diameter on the observed strength of concrete cores", Commowealth Scientific and Industrial Research Organization Division of Building, Research Report No. 50. Melbourne, Australia.
24 Loo, Y.H., Tan, C.W. and Tam, C.T. (1989), "Effects of embedded reinforcement on the measured strength of concrete cylinders", Mag. Concrete Res., 41(146), 11-18.   DOI   ScienceOn
25 Malhotra, V.M. (1976), Testing Hardened Concrete: Non-destructive Methods, ACI Monograph No. 9, Detroit, USA.
26 Meininger, R.C. (1968), "Effect of core diameter on measured concrete strength", J. Mater., 3(2), 320-336.
27 Masi, A. and Chiauzzi, L. (2013), "An experimental study on the within-member variability of in-situ concrete strength in RC building structures", Construct. Build. Mater., 47, 951-961.   DOI   ScienceOn
28 Masi, A., Digrisolo, A. and Santarsiero, G. (2013), "Experimental evaluation of drilling damage on the strength of cores extracted from RC buildings", Proceedings of the International Conference on Earthquake and Structural Engineering (ICESE 2013), Stockholm, July.
29 Masi, A. and Vona, M. (2009), "La stima della resistenza del calcestruzzo in-situ: impostazione delle indagini ed elaborazione dei risultati", Progettazione sismica, 1/2009, IUSS Press, Pavia, Italy. (in Italian)
30 Meininger, R.C., Wagner, F.T. and Hall, K.W. (1977), "Concrete core strength - the effect of length to diameter ratio", J. Test. Eval., 5(3), 147-153.   DOI   ScienceOn
31 Mikulic, D., Pause, Z. and Ukraincik, V. (1992), "Determination of concrete quality in a structure by combination of destructive and non-destructive methods", Mater. Struct., 25, 65-9.   DOI
32 Murdock, J.W. and Kesler, C.E. (1957), "Effect of length to diameter ratio of specimen on the apparent compressive strength of concrete", ASTM Bull., 68-73.
33 Newman, K. and Lachance, L. (1964), "The testing of brittle materials under uniform uniaxial compressive stresses", Proceedings of the American Society for Testing and Materials, 64, 1044-1067.
34 PCM (2003), Norme tecniche per il progetto, la valutazione e l'adeguamento degli edifici - Allegato 2, O.P.C.M., n.3274 - 20/03/2003, Presidenza del Consiglio dei Ministri, Roma. (in Italian)
35 UNI EN 12390-1 (2009), Testing hardened concrete - Shape, dimensions and other requirements for specimens and moulds, Unification National Institute, Brussels, Belgium.
36 Qasrawi, H.Y. (2000), "Concrete strength by combined nondestructive methods simply and reliably predicted", Cement Concrete Res., 30, 739-746.   DOI   ScienceOn
37 Sturrup, V.R., Vecchio, F.J. and Caratin, H. (1984), "Pulse velocity as a measure of concrete compressive strength", In Situ/nondestructive Testing of Concrete, Special Publication SP-82, American Concrete Institute, Detroit.
38 Trtnik, G., Kavcic, F. and Turk, G. (2009), "Prediction of concrete strength using ultrasonic pulse velocity and artificial neural networks", Ultrasonics, 49(1), 53-60.   DOI   ScienceOn
39 UNI EN 12390-3, (2009), Testing hardened concrete - Compressive strength of test specimens, Unification National Institute, Brussels, Belgium.
40 UNI EN 12504-1 (2009), Testing concrete in structures - Cored specimens - Taking, examining and testing in compression, Unification National Institute, Brussels, Belgium.
41 Uva, G., Porco, F., Fiore, A. and Mezzina, M. (2013), "Proposal of a methodology of in-situ concrete tests and improving the estimate of the compressive strength", Construct. Build. Mater., 38(1), 72-83.   DOI   ScienceOn
42 Uva, G., Porco, F., Fiore, A. and Mezzina, M. (2014), "The assessment of structural concretes during construction phases", Struct. Sur., J. Build. Path. Refurbish., 32(3), DOI: 10.1108/SS-06-2013-0023.   DOI   ScienceOn