Efeito da adição de argila expandida e adições minerais na formulação de concretos estruturais leves autoadensáveis
The search for alternative materials with lower density, reduction in heat transfer and propagation of noise associated with the ease of handling and application in concrete structures, represents an enormous challenge in the formulation and knowledge of the performance of self-compacting lightweigh...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15567 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | The search for alternative materials with lower density, reduction in heat transfer and
propagation of noise associated with the ease of handling and application in concrete
structures, represents an enormous challenge in the formulation and knowledge of
the performance of self-compacting lightweight concrete, which has technology little
known nationally, and appears on the international scene as an innovative material
and alternative to conventional concrete. Based on these, this study set out to study
self-compacting lightweight concrete made with two distinct grades of expanded clay
associated with the addition of plasticizing/superplasticizers additives and mineral
additions of metakaolin and bagasse ash of sugar cane. There is also an object of
study, evaluation of pozzolanic activity of mineral admixtures and their influence on
the durability characteristics of concrete. The rheological, physical, mechanical and
microstructural analysis in this study served as basis in the classification of concretes
autoadensáveis, targeting the national technical requirements for their classification
in the category autoadensável and lightweight structural. The inclusion of mineral
admixtures (metakaolin and bagasse ash of sugar cane), partial replacement of
cement, pozzolanic activity and demonstrated maintenance of mechanical properties
through the filler effect, a reduction of up to 76% of the nitrogen gas permeability in
blend with 20% bagasse ash. All concretes had rheology (cohesion and consistency)
suitable for self-adensability as well as strength and density inherent structural
lightweight concrete without presenting phenomena of segregation and exudation |
|---|