ISBN 978-85-60064-56-4
15th NOCMAT 2014 - 30 years
November 23-25th
FZEA/USP - Pirassununga - SP - Brazil
108
USE OF SUGARCANE BAGASSE ASH IN OF
CONCRETES FOR AGGRESSIVE ENVIRONMENT
APPLICATIONS IN AGRICULTURAL INDUSTRIES.
Santos, Luciana Alvarenga1; Rodrigues, Conrado de Souza2*;
Baêta, Fernando da Costa³; Tinoco, Ilda de Fátima Ferreira4
Centro Federal de Educação Tecnológica de Minas Gerais – Campus VIII, Av. dos Imigrantes,
1000, Bairro Vargem, CEP 37.022-560, Varginha – MG, Brasil
1
Centro Federal de Educação Tecnológica de Minas Gerais – Campus II – Departamento de
Cnstrução Civil - Av. Amazonas, 7675 – Bairro Nova Gameleira, CEP 30510-900,
Belo Horizonte – MG, Brasil
2
*[email protected]
Abstract: This study aims to evaluate the mechanical properties of concretes in which the
cement was partially replaced by sugarcane bagasse ash (SCBA). Three different ashes were
investigated in terms of their physical and chemical properties in order to establish the more
adequate as a mineral admixture. The bagasse processing involved preliminary drying, burning
and sieving, chemical treatment, controlled burning and grinding. Three types of SCBA were
obtained from these processes: a) ash processed by the sugar plant as a biomass for energy
generation (“as received” ash); b) ash (a) submitted to a controlled burning process and; c)
ash treated by acid attack prior to the controlled burning process. The concretes were designed
considering their application in the floor of a swine barn and the samples were produced with
12% replacement of cement by SCBA. For the durability assessment, the concrete samples
were exposed to acid attack by acetic and lactic acids and to abrasion wearing. Attack by acetic
acid has shown to be more aggressive than lactic acid and the. Also, the 21 days used for the
acid attack was adequate, as far as the concretes presented reduced strength and acid solution
has it pH decreased. Under the test conditions applied, the three ashes resulted in concretes
suitable for the application proposed. The “as received” ash was considered more effective once
it enhanced the concrete strength and its resistance to the acid attack and abrasion without the
need for additional processing.
Keywords: Sugarcane bagasse ash, pozzolanic admixture in concrete, concrete floors for pigs