Análise da viabilidade do uso de cinzas agroindustriais em matrizes cimentícias: estudo de caso da cinza da casca da castanha de caju / Feasibility analysis of using agroindustrial ashes in cementitious materials: case study of ash of the rind of the cashew nut

AUTOR(ES)

Sofia Araújo Lima

DATA DE PUBLICAÇÃO

2008

RESUMO

Nowadays, the use of wastes on civil building has been stimulated for it to be one of most consumers of raw materials in their processes and products. The agroindustrial ashes have a prominent place among the wastes with possibilities of application in cementitious materials, because some ashes, such rice husk ash, have pozzolanic activity, and they contribute to reduce the Portland cement consumption. This work aimed to study the evaluation of technical feasibility of the agroindustrial ashes for use in Portland cement matrices, using the ash of the rind of the cashew nut (ARCN) as case study. The rinds of cashew nut (wastes of nutsproduction) are burned again during the heating process, and in boilers, they will generate heat for shelling other nuts. The ARCN is the waste collected from the boiler grid, resulted from burning of the rind of nuts. This waste is used as compostes in plantings of cashew and a little part of it is dumped in landfill sites. Tests were made for evaluation of physico-chemical composition of ARCN; for analyse of pozzolanic activity; for analyse of drying shrinkage and carbonation in mortars made with ARCN; and the analyse of the stabilization/solidification of ARCN in pastes. After the analyse of results, it may be pointed as main features of ARCN: i) not show pozzolanic activity; ii) to promote air entrainment in cementitious matrices; iii) to cause heavy metals and Phenol solubilization as in raw state; iv) to increase the drying shrinkage and carbonation in mortars; and, v) to let out Chrome and Sodium when stabilizated/solidificated in pastes in levels of replacement until 10%. For all these considerations, the ARCN havent showed technical feasibility for use in cementitious matrices.

ASSUNTO(S)

technical feasibility agroindustrial ashes viabilidade técnica adições minerais resíduos agroindustriais matrizes cimentícias ash of the rind of the cashew nut cementitious matrices cinza da casca da castanha de caju mineral admixtures

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