Correlação de resistência à compressão de prismas e blocos de concreto

Abstract

Structural masonry is a constructive system very present in the Brazilian civil construction and continues to growing and updated constantly with new studies and technologies. In this work, the prism/block relationship will be approached and compared with some of the main Brazilian and foreign literature and standards, in addition to the comparison of the coefficients of variation of the units, ungrouted prism, grouted prism, mortar and grout tests. The study was based on more than 37,000 tests carried out by Brazilian construction companies and organized into 873 sets of tests in order to obtain the prism/unit ratio and the coefficients of variation for each type of test using graphs. The results obtained for the coefficients of variation indicate an average of 6.66% and 4.20% for the hollow and full prism tests respectively, and for the 95% certainty value the results were 12.58% and 9, 57%. These coefficient values show significantly lower values than the value used by the standard, 20%. The results of the prism/block ratio were related to foreign and Brazilian standards and obtained consistent general values, being slightly less conservative than the Brazilian standard for the average straight line of the sets of tests results.