Analysis on Gold Tailings-Based Aerated Concrete in Different Phases of Autoclave Curing Based on Nuclear Magnetic Resonance

Qian Li, Keqing Li, Wen Ni, Siqi Zhang, Dezhong Li, Wei Chen
2019 Revue des composites et des matériaux avancés  
This paper prepares an aerated concrete (AC) with gold tailings as the main material, and explores the influence of different phases of autoclave curing on the microstructure of the proposed AC. Three specimens were selected for nuclear magnetic resonance (NMR) tests: the specimen not autoclaved after the 12h static curing, the specimen autoclaved for 0h in the autoclave (i.e. only heated up and cooled down), and the specimen autoclaved for 8h under constant temperature. The three specimens are
more » ... denoted as NAC, AAC-0 and AAC-8, respectively. The internal structures of the specimens in each phase of autoclave curing were analyzed through 27 Al NMR and 29 Si NMR tests. The results show that the Si-O tetrahedrons in the AAC-8 specimen mainly exist in the form of Q2 structures; the 1.1nm tobermite crystal is a chain silicate. The research results help to reveal the reaction mechanism of the AC in each phase of curing, and improve the performance of gold tailings-based AC.
doi:10.18280/rcma.290607 fatcat:fthg2z3bcrhfrkjfwrtr4jhqm4