Alkali-Activated Binder Based on Milled Antigorite

Minerals

BasyaI. Gurevich¹  ElenaV. Kalinkina¹  AlexanderM. Kalinkin¹ 

[1] Tananaev Institute of Chemistry-Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences, Akademgorodok 26a, 184209 Apatity, Murmansk Region, Russia;

关键词: antigorite;    ore dressing tailings;    mechanical activation;    alkali-activated binder;   

DOI  :  10.3390/min8110503

来源: DOAJ

【 摘 要 】

Antigorite is a very common rock-forming mineral and it is often present in mining wastes. Utilization of these wastes is a very important issue from the environmental point of view. A potential use for mining wastes is for the production of building materials. This study investigated the alkali activation of antigorite and antigorite-containing ore dressing tailings (AT) milled in a planetary ball mill in an air or CO₂ atmosphere. The specific surface area, amorphisation, and dehydroxylation of milled antigorite and AT were examined, and their effect on the cementitious properties was investigated. Binders were prepared by mixing the milled antigorite or AT with liquid glass and curing at 20 ± 2 °C in dry (relative humidity of 65 ± 5%) or humid (relative humidity of 95 ± 5%) conditions for up to 28 days. Curing at dry conditions was found to produce binders with increased strengths. The compressive strength of the alkali-activated binder also increased with increased milling time. For AT milled in air for 4 min and cured in dry conditions for 28 days, the compressive strength was 49 MPa. The milling atmosphere (air or CO₂) influenced the cementitious properties of the alkali activated binder to a small extent.

【 授权许可】

Unknown