Swine deep bedding ashes as a mineral additive for cement based mortar

Scientia Agricola

Melissa Selaysim Di Campos²  Normando Perazzo Barbosa¹  Holmer Savastano Jr.² 

[1] ,USP FZEA Depto. de Engenharia de AlimentosPirassununga SP ,Brasil

关键词: rice husk;    pozzolanicity;    vitreous silica;    sustainability;    casca de arroz;    pozolanicidade;    sílica vítrea;    sustentabilidade;   

DOI  :  10.1590/S0103-90162008000200001

来源: SciELO

【 摘 要 】

The sustainability of intensive swine production demands alternative destinations for the generated residues. Ashes from swine rice husk-based deep bedding were tested as a mineral addition for cement mortars. The ashes were obtained at 400 to 600ºC, ground and sieved through a 325 mesh sieve (# 0.045 mm). The characterization of the ashes included the determination of the index of pozzolanic activity with lime. The ashes were also tested as partial substitutes of Portland cement. The mortars were prepared using a cement:sand proportion of 1:1.5, and with water/cement ratio of 0.4. Three percentages of mass substitution of the cement were tested: 10, 20 and 30%. Mortar performances were assessed at 7 and 28 days determining their compressive strength. The chosen condition for calcinations at the laboratory scale was related to the maximum temperature of 600ºC since the resulting ashes contained vitreous materials and presented satisfactory values for the pozzolanic index under analysis. The pozzolanic activity indicated promising results for ashes produced at 600ºC as a replacement of up to 30% in cement masses.

【 授权许可】

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