| Full text | |
| Author(s): |
Nakanishi, Erika Yukari
[1]
;
dos Santos, Valdemir
[1]
;
Cabral, Matheus Roberto
[1]
;
Santos, Sergio Francisco
[2]
;
Rodrigues, Michelle Santos
[3]
;
Frias, Moises
[4]
;
Savastano Junior, Holmer
[1]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Res Nucleus Mat Biosyst BIOSMAT, Pirassununga, SP - Brazil
[2] Sao Paulo State Univ, Sch Engn, Dept Mat & Technol, Guaratingueta, SP - Brazil
[3] Sao Paulo Fac Technol, Ctr Paula Souza, Sao Paulo, SP - Brazil
[4] CSIC, Eduardo Torroja Inst IETcc, Madrid - Spain
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | MATERIA-RIO DE JANEIRO; v. 23, n. 3 2018. |
| Web of Science Citations: | 0 |
| Abstract | |
ABSTRACT In recent years, agro-industrial residues have focused attention in the scientific community as a new source of pozzolans. In Brazil, for example, one of the wastes generated from agro-industrial activities comes from elephant grass that is cultivated as biomass for energy cogeneration. This study evaluated the effect of hot water treatment on the crystalline structure of elephant grass ashes calcinated in two different temperature (700 and 900°C). To study the chemical structure and the composition of the ashes the X-ray fluorescence (XRF) and X-ray diffractions (XRD) analyses were carried out. The results achieved in the present work shown that, elephant grass ashes meet the ASTM C-618 standard, for the minimum sum content of the silica (SiO2), aluminum (Al2O3) and iron (Fe2O3) oxides, of 50% to be considered as a pozzolanic material. The presence of an amorphous phase has been detected in all XRD patterns. The ashes calcinated at 700°C showed lower crystallinity and the treatment with hot water decreased crystallite size, i.e., the material became more amorphous. On the other hand, the ashes calcinated at 900°C, less reactive, had a lower content of K2O. Therefore, the hot water treatment was effective to reduce the potassium content in the ashes. Additionally, it contributed to reduce the crystallite size of silica in the ash calcinated at 700°C, while the effect is contrary to the ash calcinated at 900°C. (AU) | |
| FAPESP's process: | 16/07372-9 - Particleboard based on biomaterials with functional gradation for using as piglet shelter |
| Grantee: | Erika Yukari Nakanishi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/23810-8 - Study of cementitious matrices with agroindustrial ashes and vegetable fibers for fibre-cement |
| Grantee: | Valdemir dos Santos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 11/16842-5 - Waste ashes from the burning of the elephant grass (Pennisetum purpureum) as pozzolanic material for the partial substitution of the ordinary Portland cement |
| Grantee: | Erika Yukari Nakanishi |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 12/51467-3 - Agroindustrial wastes and their potential use as appropriate materials for housing and infraestructure (Agrowaste) |
| Grantee: | Holmer Savastano Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/50790-8 - Non conventional cement-based materials developed with industrial wastes as a contribution for a more sustainable industry |
| Grantee: | Holmer Savastano Junior |
| Support Opportunities: | Regular Research Grants |