Variations of in situ concrete strength by European Standard and American Code. (23rd November 2017)

• Record Type: Journal Article
• Authors: Gavilan, Sergio; Da S. Filho, Luiz Carlos Pinto
• Is Part Of: Structural concrete. Volume 19:Number 4(2018)
• Page Start: 1185
• Page End: 1194
• Publication Date: 2017-11-23
• Subjects: American codes -- compressive strength -- concrete -- cores -- European codes; Reinforced concrete -- Periodicals; 624.1834
• DOI: 10.1002/suco.201700115
• Languages: English
• ISSNs: 1464-4177

Abstract

Abstract : Europe and United States exert a worldwide influence in the field of concrete control, proof of this is that many countries adopt their regulations, due to lack of own regulations. When there are problems with concrete strength, cores are used, and this situation usually involves two or more parties with different views on the proper interpretation of the core results. An experimental study was carried out, with five lots of prototypes concrete slabs of 20, 30, and 35 MPa specified strength, 210 cylinders of 10 × 20 cm, 296 cores of 10 cm diameter, and slenderness 2, as well as temperature and maturity control. Estimated strength of cores and cylinders was compared according to the criteria of European standards UNE‐EN 13791 and the American code ACI 318. Tests were performed at 3, 5, 7, and 28 days. It is concluded that the European and American regulations present similar results for concretes with specified strength between 30 and 35 MPa, whereas in the range of 16–30 MPa, the European standard is more rigorous than the American Code, being the latter more favorable to the concrete producer.