2017
DOI: 10.1590/s1983-41952017000400008
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A new study of Brazilian concrete strength conformance

Abstract: A new study of Brazilian concrete strength conformance Um novo estudo da conformidade da resistência do concreto produzido no Brasil Abstract ResumoThis paper presents a new evaluation of the strength compliance of concretes produced in Brazil. It is based on experimental results of over twenty-seven thousand concrete samples from different parts of the country. Results show that a significant part of Brazilian concrete do not reach the characteristic strength (fck) specified in design, and the percentage of n… Show more

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Cited by 9 publications
(6 citation statements)
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“…Although Class A blocks tend to have a smaller estimated strength and a lower average strength, Figure 3 makes clear that these same blocks have less dispersion in their results indicating that there is less variability among them. Stewart and Laerence [16] obtained coefficients of variation (C.V.) around 0.19, which are in line with the values found in this study and in studies about the conformance of concretes manufactured in Brazil [17,18,19,20]. Table 5 presents results obtained for the concrete blocks dimensions, at regional and national level.…”
Section: Study Of Brazilian Structural Concrete Block Conformitysupporting
confidence: 88%
“…Although Class A blocks tend to have a smaller estimated strength and a lower average strength, Figure 3 makes clear that these same blocks have less dispersion in their results indicating that there is less variability among them. Stewart and Laerence [16] obtained coefficients of variation (C.V.) around 0.19, which are in line with the values found in this study and in studies about the conformance of concretes manufactured in Brazil [17,18,19,20]. Table 5 presents results obtained for the concrete blocks dimensions, at regional and national level.…”
Section: Study Of Brazilian Structural Concrete Block Conformitysupporting
confidence: 88%
“…The characteristics of the random variable resistance f c were derived from results of axial compression tests, performed at 28 days, in more than 39 thousand cylindrical specimens of concrete, molded "in loco" all over Brazil, between 2011 and 2016, as reported by Santiago and Beck (2017a), Santiago and Beck (2017b) and Santiago and Beck (2018). Table 1 presents the results concerning this variable, where the mean (µ) is expressed as a function of the characteristic strength of concrete (f ck ).…”
Section: Concrete Compressive Strengthmentioning
confidence: 99%
“…A summary of the results concerning these variables is shown in Table 1; it is important to notice that the means are expressed as a function of their respective characteristic or nominal values. Statistics in Table 1 were obtained from results of axial compression tests at 28 days performed in more than 39 thousand cylindrical specimens of concrete molded in loco all over Brazil, between 2011 and 2016, as reported by Santiago and Beck [15,16,17]. As in the work of Nowak et al [8], the parameters of the probability distribution functions of the variables were ob-Reliability-based calibration of Brazilian structural design codes used in the design of concrete structures tained from the adjustment of probability density function ( Figure 1).…”
Section: Resistance Variablesmentioning
confidence: 99%