ESTUDO DO CAULIM CALCINADO COMO MATERIAL DE SUBSTITUIÇÃO PARCIAL DO CIMENTO PORTLAND

Conferência Brasileira de Materiais e Tecnologias NãoConvencionais: Habitações e Infra-Estrutura de Interesse Social
Brasil-NOCMAT 2004
Pirassununga, SP, Brasil, 29 de outubro – 3 de novembro, 2004

ESTUDO DO CAULIM CALCINADO COMO MATERIAL DE
SUBSTITUIÇÃO PARCIAL DO CIMENTO PORTLAND
Marilia Pereira de Oliveira1,MSc., Aline Figueiredo da Nóbrega2, Melissa Selaysim Di
Campos, MSc3, Normando Perazzo Barbosa4, Prof. Dr.
1

Pós-Graduanda, Universidade Federal de Campina Grande – [e-mail]
Aluna de Iniciação Científica do Curso de Engenharia Civil, Universidade Federal da Paraíba
3
Pós-Graduanda, Fac. de Zootecnia e Engenharia de Alimentos da Universidade de São Paulo.
4
Professor Titular do Centro de Tecnologia, Universidade Federal da Paraíba
2

ABSTRACT
The use of burned clays, in the metakaolin form, as pozzolanic material for mortars and concretes is having a remarkable attention in the last years. This work has as objective to study the potentialities of a local caulim as partial cement replacement material. Two finess of the caulim were used: #200 and #325, burned at temperatures of 700, 800 and 900oC for a period of 2 hours. The amounts of replacement were 10, 20, 30 and 40%, besides the reference mortar, being the relationship wate/binder ratio constant and equal to 0,4. The pozolanic activity index was determined in mortars with the cement Portland. The effect of partial substitution of cement in mortar was evaluated through compression strength and speed of propagation of ultra-sonic wave. Mortars with kaolin presented superior strength comparing to reference mortar, until the level of 30% of substitution, when burned in the temperatures of 700 and 800oC for both finess. The ultra-sonic speed propagation wave reduces in agreement with the increasing of substitution tax showing that the parcial cement replacement modifies the pore structure of the mortars.
KEY WORDS: cement replacement material, kaolin, mortar,