Cimento de baixo impacto ambiental a partir dos resíduos cauliníticos da Amazônia

Materia

article

Euler Santos Arruda Junior¹  Márcio Santos Barata¹ 

[1] Universidade Federal do Pará

关键词: Kaolinitic Waste;    LC3;    CO2 Emission;    Amazônia;    Sustainability;   

DOI  :  10.1590/1517-7076-RMAT-2021-46434

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The use of mineral admixtures as a partial replacement of clinker in Portland cement has been one of the main strategies for reducing CO2 emissions by the global cement industry. However, the availability of ground blast furnace slag and fly ash does not supply the demand. In the Amazon region, the kaolin processing industries as a coating for paper have already deposited around 70 million tons of waste, essentially consisting of extremely fine kaolin. An alternative for the region would be the use of Portland cement with limestone and calcined clay to produce a cement with low CO2 emission, the limestone calcined clay cement (LC3). The objective of this work was to evaluate the properties of these cements from high limestone incorporations and metakaolin from the mine processing waste, the flint kaolin. The evaluated percentages of replacement of Portland clinker by mineral admixture were 45% and 60%. The variables investigated were specific mass, Blaine specific surface area, consistency water, setting times and compressive strength. The metakaolin and limestone cements showed higher water demand and shorter setting times due to the high fineness of kaolinite. However, the compressive strength gains were significant compared to ordinary and limestone Portland cements, demonstrating the high efficiency of this binder. The results are promising, but require further studies, especially with regard to the durability and dimensional stability of concrete and mor-tars produced from these cements.

【 授权许可】

CC BY