Use of ancient copper slags in Portland cement and alkali activated cement matrices

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:167

Article

Nazer, Amin^1,2  Paya, Jordi¹  Victoria Borrachero, Maria¹  Monzo, Jose¹ 

[1] Univ Politecn Valencia, Inst Ciencia & Tecnol Hormigon ICITECH, Camino de Vera S-N,Edificio 4G, E-46022 Valencia, Spain

[2] Univ Atacama, Inst Tecnol, Copiapo, Chile

关键词: Copper slag;    Pozzolanic activity;    Alkali activation;    Geopolymer;   

DOI  :  10.1016/j.jenvman.2015.11.024

来源: Elsevier

【 摘 要 】

Some Chilean copper slag dumps from the nineteenth century still remain, without a proposed use that encourages recycling and reduces environmental impact. In this paper, the copper slag abandoned in landfills is proposed as a new building material. The slags studied were taken from Playa Negra and Puquios dumps, both located in the region of Atacama in northern Chile. Pozzolanic activity in lime and Portland cement systems, as well as the alkali activation in pastes with copper slag cured at different temperatures, was studied. The reactivity of the slag was measured using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical conductivity and pH in aqueous suspension and Fourier Transform Infrared Spectroscopy (FTIR). Furthermore, copper slag Portland cement mortars with the substitution of 25% (by weight) of cement by copper slag and alkali-activated slag mortars cured at 20 and 65 degrees C were made, to determine the compressive strength. The results indicate that the ancient copper slags studied have interesting binding properties for the construction sector. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free