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On-line version ISSN 1678-4553
CASTRO, A. L. de; LIBORIO, J. B. L. and PANDOLFELLI, V. C.. Performance of advanced concretes for building site designed by computing mix proportion technique. Cerâmica [online]. 2009, vol.55, n.335, pp.233-251. ISSN 1678-4553. http://dx.doi.org/10.1590/S0366-69132009000300002.
The search for materials with better mechanical performance and durability has been the aim of the concrete's technology researchers. In order to attain this target, concretes developed with engineering microstructure are necessary. Based on the concepts of particle packing and dispersion, it is possible to obtain materials with dense matrix and appropriate workability. Thus, in the present paper, the properties of concretes based on these concepts are presented and compared to those high performance ones used in building site researches. The fresh properties were evaluated measuring the fluidity index and the rheological behavior of the material. In the hardened condition, the mechanical strength were evaluated by the compressive, splitting tensile and 3 point bending tests, whereas the Young's modulus were measured by the static and dynamic methods. The new concretes showed to be more workable for a longer period of time than the reference one, without the need of retarding admixtures addition. In terms of mechanical strength, it was possible to verify higher reproducibility for the concretes designed with the computing mix proportion technique. Besides that, it was also possible to establish good correlations between the strength measured for these concretes, as well for the Young's modulus measured by both test methods.
Keywords : microstructure engineering; particle dispersion and packing; rheological properties; mechanical resistance; special concretes.