期刊论文详细信息
Materials Research
Compressive strength, microstructure and hydration products of hybrid alkaline cements
Zahra Abdollahnejad2  Petr Hlavacek1  Sergio Miraldo2  Fernando Pacheco-torgal2  José Luís Barroso De Aguiar1 
[1] ,University of Minho C-TAC Research Centre Guimarães,Portugal
关键词: hybrid alkaline cements;    compressive strength;    efflorescences;    microstructure;   
DOI  :  10.1590/S1516-14392014005000091
来源: SciELO
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【 摘 要 】

Ordinary Portland cement (OPC) is the dominant binder in the construction industry with a global production that currently reaches a total of 3 Gt per year. As a consequence, the cement industry's contribution to the total worldwide CO2 emissions is of about 7% of the total emissions. Publications on the field of alkali-activated binders (also termed geopolymers), state that this new material is, potentially, likely to fbecome an alternative to Portland cement. However, recent LCA studies show that the environmental performance of alkali-activated binders depends, to great extent, of their composition. Also, researchers report that these binders can be produced in a more eco-efficient manner if the use of sodium silicate is avoided. This is due to the fact that the referred component is associated to a high carbon footprint. Besides, most alkali-activated cements suffer from severe efflorescence, a reaction originated by the fact that the alkaline and/or soluble silicates that are added during processing cannot be totally consumed. This paper presents experimental results on hybrid alkaline cements. The compressive strength results and the efflorescence observations show that some of the new mixes already exhibit a promising performance.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License

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