In Situ Strength Assessment of Concrete Using Recycled Aggregates by Means of Small Diameter Cores

Document Type: Regular Paper


1 Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran

2 Department of Civil Engineering, University of Guilan, Rasht, Iran



By increasing the demolition of old concrete structures and the interest of civil industries to consume cheaper materials, using Recycled Concrete Aggregate (RCA) can cause environmental protection and decrease the construction costs. On the other hand, the high potential of Recycled Aggregate Concrete (RAC) in concrete industry was established by extensive experimental researches were performed to examine the properties of RAC. Like in conventional concrete, core test cut from RAC can be used to assess the in-place concrete compressive strength and sometimes it becomes an important test for monitoring in-situ properties of concrete to taking up retrofitting/strengthening measures. So the core test is often mentioned in most codes for concrete testing. The layout of this study includes four concrete mixes, two concrete grades (20 and 40 MPa), three core diameters (46, 69, and 100 mm), five length-to-diameter (L/D) ratios (1, 1.25, 1.5, 1.75, and 2), two sizes of maximum coarse recycled aggregates (10 and 20 mm), two directions of core drilling which are vertical and horizontal and three ages of specimen (14, 28 and 90 days). The core test results were compared to cylindrical and cube specimens. Results imply that the core strength of recycled concrete reduces with the increase in aspect ratio, by decreasing the core diameter, increasing the size of coarse aggregates in recycled concrete. By analyzing the results a comparison was made between recycled concrete in this study and conventional concrete in other studies, as well as code instructions.


Main Subjects

[1] Naderpour, H., Rafiean, A.H. and Fakharian, P., 2018. Compressive strength prediction of environmentally friendly concrete using artificial neural networks. Journal of Building Engineering,16, pp.213-219,

[2] Kisku. N, Joshi. H, Ansari. M, Panda. S.K, Sanket Nayak, Sekhar Chandra Dutta, (2017), A critical review and assessment for usage of recycled aggregate as sustainable construction material. Construction Building Material, Vol.131,721-740, buildmat.2016.11.029.

[3] Silva. R. V, Brito. J. D, Dhir. R. K, (2014) The influence of the use of recycled aggregates on the compressive strength of concrete: a review, European Journal of Environmental and Civil Engineering, Vol. 19, 825-849,

[4] Brito. J. D, Ferriera. J, Pacheco. J, Soares. D, Guerreiro. M, (2016) Structural, material, mechanical and durability properties and behavior of recycled aggregate concrete. Journal of Building Engineering, Vol. 6, 1-16,

[5] Kho Pin Verian, Warda Ashraf, Yizheng Cao, (2018), Properties of recycled concrete aggregate and their influence in new concrete production, Resources, Conservation & Recycling, 133, 30- 49.

[6] Gholampour, A., Gandomi, A.H. and Ozbakkaloglu, T., 2017. New formulations for mechanical properties of recycled aggregate concrete using gene expression programming. Construction and Building Materials, 130, pp.122-145,

[7] Castorina Silva Vieira, Pereira. Paulo M., (2014), Use of recycled construction and demolition material in geotechnical applications: A review, Resources, Conservation and Recycling, Vol.103, 192-204,

[8] Bungey. J.H, Millard. S.G, Grantham. M.G, (2006), Testing of concrete in structure (4th edition), Taylor & Francis, London and New York.

[9] Neville. A (2001) Core tests – Easy to perform, not easy to interpret. Concrete International, Vol. 23(11), 59–68.

[10] Silva. R. V, Brito. J. D, Dhir. R. K, (2014), Properties and composition of recycled aggregate from construction and demolition waste suitable for concrete production. Construction Building Material, Vol. 65,201-217,

[11] Fonseca N, Brito. J. D, Evangelista L, (2011), The influence of curing conditions on the mechanical performance of concrete made with recycled concrete waste. Cement and Concrete Composites, Vol. 33(6), 637-43, https://doi:10.1016/j.cemconcomp.2011.04.002.

[12] Akbarnezhad, A, Ong. K. C. G., Zhang. M. H., Tam. C. T, Foo, T. W. J, (2011), Microwave assisted beneficiation of recycled concrete aggregates. Construction and Building Materials, Vol.25, 3469–3479,

[13] Dhir R. K, Paine K. A, (2004), Suitability and practicality of using coarse RCA in normal and high strength concrete. Paper presented at the 1st International Conference on Sustainable Construction: Waste Management, Singapore, 108–123.

[14] Guoliang. Bia, Chao Zho, Chao Liu, Biao Liu ,(2020), An evaluation of recycled aggregate characteristic and the recycled aggregate concrete mechanical properties. Construction and Building Material, 240, 117978,

[15] Lima. C, Caggiano. A, Faella. C, Martinelli. E, Pepe. M, Realfonzo. R, (2013), Physical properties and mechanical behaviour of concrete made with recycled aggregates and fly ash. Construction Building Material, Vol.47,547–559,DOI: 10.1016/j.conbuildmat.2013. 04.051.

[16] Evangelista L, Bravo M, Agrela F, (2013), Influence of water reducing admixtures on the mechanical performance of recycled concrete. J Clean Prod., Vol.59, 93–98.

[17] Li. W.X, Zhang. X, Liu. X, (2009), Mechanical properties of recycled aggregate concrete. Study of the impact of factors. Chin Concr. J, Vol.10, 60–63.

[18] Otsuki. N, Miyazato. S, Yodsujai. W, (2003), influence of recycled aggregate on interfacial transition zone, strength, chloride penetration and carbonation of concrete, J. Mater. Civil Eng., Vol. 15(5), 443-45, (ASCE)0899-1561(2003)15:5(443)

[19] Ruijun Wang, Ningning Yu, Yang Li, (2020), Methods for improving the microstructure of recycled concrete aggregate: A review, Construction and Building Material, 242, 118164,

[20] BS (1983) 1881: Part 120: Method for determination of the compressive strength of concrete cores. British Standards Institution, 8 pp.

[21] BS EN 12504-1(2009): Testing concrete in structures. Cored specimens. Taking, examining and testing in compression. British Standards Institution.

[22] Concrete Society (CS), (1987), Concrete core testing for strength. Tech. Rept.11, London.

[23] ASTM C42 ( 2012), Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete, Philadelphia: ASTM International.

[24] Tuncan. M, Arioz. O, Ramyar. K, Karasu. B, (2008), Assessing concrete strength by means of small diameter cores, Construction and Building Materials, Vol. 22,981–988,doi:10.1016/j.conbuildmat. 2006.11.020.

[25] Bungey. J. H, (1979), Determining concrete strength by using small diameter cores. Mag. Concrete Research, Vol. 31(107), 91–98.

[26] Bartlett. F. M, MacGregor. JG, (1994), Effect of Core Length-to-Diameter Ratio on Concrete Core Strengths, ACI Materials Journal, Vol. 9 (4), 339-348.

[27] Khoury. S, Aliabdo. A, Ghazi. A, (2014), Reliability of core test- Critical assessment and proposed new approach, Alexandria Engineering Journal, Egypt, Vol.53,169-184,

[28] Mostefa Kazemi, Rahmat Madandoust, Jorge de Brito, (2019), Compressive strength assessment of recycled aggregate concrete using schmidt rebound hammer and core testing, Construction and Building Material, 224, 630-638,

[29] Sadati. S, Khayat. K.H, (2016), Field performance of concrete pavement incorporating recycled concrete aggregate, Construction and Building Materials, Vol.126,691-700, 10.1016/ j.conbuildmat.2016.09.087.

[30] Bonifazi. G, Palmieri. R, Serranti. S, (2016), Concrete drill core characterization finalized to optimal dismantling and aggregate recovery, Waste management, Vol.60, 301-310, doi: 10.1016/j.wasman.2016.10.008

[31] ACI Committee 214.4R-10 (2010): Guide for Obtaining Cores and Interpreting Compressive Strength Results. Farmington Hills: American Concrete Institute.

[32] Hansen. T. C, Henrik. N, (1983), strength of recycled concrete made from crushed concrete coarse aggregate, Concr. Int., Vol. 5(1), 79-83.

[33] Tam. V.W, Gao. X.F, Tam. C.M, (2005), Microstructural analysis of RAC produced from two- stage mixing approach, Cement Concrete Research, Vol.35 (6), 1195-1203,

[34] Bartlett. F.M, MacGregor. J.G, (1994), Effect of core diameter on concrete core strengths. ACI Mater. J., Vol. 91(5), 460–470.

[35] Arioz, O, K. Kamyar, M. Tuncan, A. Tuncan, I. Cil, (2007), Some Factors Influencing Effect of Core Diameter on Measured Concrete Compressing Strength. ACI Material Journal, Vol.104(3), 291-296.

[36] Comite Europeen de Normalisation (CEN), (2005), Design of structure, part 3: Assessment and retrofitting of building, EN1998-3.

[37] Mehta. P.K., Monteiro. J.M., (2014), Concrete Microstructure, Properties and Materials. New York: McGraw Hill Education.

[38] Munday, J.G.L, R. K. Dhir, (1984), Assessment of in situ concrete quality by core testing. American Concrete Institute.