Método de dosagem de concreto pelo volume de pasta com emprego de cinza volante / Concrete mix-proportioning method by cement paste volume using fly ash

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2011

RESUMO

This study was developed in order to create and a streamlined methodology of concrete mix proportioning using fly ash to reduce the cement content and an intensive use of a pollutant contributing to the increase of sustainability in construction through reducing consumption of clínquer and the release of carbono dioxide to the atmosphere. It was established as a basic premisse the possibility of connecting directly the workability of concrete with the volume of cement paste used determinate by the most dense aggregate-packing by the smaller volume of voids in the granular structure obtained in composition of many aggregates as necessary. It was used four commercial aggregates, two natural sands and two kind of crushed stone which were commonly found in a construction materials market around Porto Alegre. The sand were mixed according to the mixture that resulted in lower bulk density and coarse aggregate to be obtained the lower volume of voids as possible, being rightly measured. With the composition of aggregate optimized the optimum volume of cement paste that give the best workability with the lower water requirement will be definite. Considering fly ash as a part of the binder it was developed different criteria for define the amount of fly ash to be incorporate in binder having as foundation the volume admitted as responsible for the best workability mixture. To calculation the concrete mix proportions, was adopted an innovative methodology from the percentage replacement of cement by fly ash and no more by the water/cement ratio. The development of the proposed study was based on creating a paradigma represented by a mix-proportioning without fly ash which allowed the calculation of mix proportions of reference. With the same materials and same proportions between the aggregate, were calculated mix proportions to attend the same compressive strength to compare by the cement content of each situation. Thereby the rresults from this study a mix-proportioning method of concrete using fly ash as an imperative input, based in diferentes concepts of given for traditional concrete technology.

ASSUNTO(S)

construção civil concrete cinza volante mix-proportioning concreto : dosagem fly ash

ACESSO AO ARTIGO

Documentos Relacionados