CONCRETE SPECIMENS CAPPING WITH GROUT FOR STRENGHT TESTING COMPRESSION
Abstract
The Portland cement concrete is the most consumed input in construction in Brazil, thus its quality deserves special attention when it comes to technological control. To assess this material, the compressive strength test is the most widely used. It is conventional the use of cylindrical specimens with dimensions of 10 cm by 20 cm. Due to failures during the molding process, observed in most of the civil works, it is necessary to perform a regularization in the specimen surface, to minimize possible failures during the compressive test. The literature review showed the different types of capping. The most used are: adhered capping (cement paste or sulfur) not adhered (Neoprene) and the top recess (grinding). We know very little about the influence of capping in the compressive strength. It is commonly used the experience of the concrete labs as a criterion for defining the best leveling the bases of cylindrical specimens. This study analyzed through mechanical tests specimens capped with industrial grouting -a type of concrete self-dense bagged- and mortar, used as a capstone in several laboratories of construction materials. There were molded 36 concrete specimens, half of them capped with mortar and half with grout. It was also examined the workability of the capping, analysis of variance (ANOVA) of mechanics results, adhesion and contact print between the top and the press. The results showed no significant difference between the use of mortar and the use of grout. Furthermore, it was found that the capping resistance does not affect the strength of the test specimens. Keywords: Concrete, Compressive Strength Test, Capping Concrete Specimens, Grout.Downloads
Published
2016-07-13
Issue
Section
Civil Engineering