Development of Eco-Friendly Mortars Produced with Kaolin Processing Waste: Durability Behavior Viewpoint

Sustainability

Suellen Lisboa Dias Beltrão¹  Fabiana Pereira da Costa¹  Jucielle Veras Fernandes¹  Romualdo Rodrigues Menezes²  Alisson Mendes Rodrigues²  Gelmires de Araújo Neves² 

[1] Graduate Program in Materials Science and Engineering (PPG-CEMat), Department of Materials Engineering, Federal University of Campina Grande, Bodocongó, Campina Grande 58429-900, Brazil;Laboratory of Materials Technology (LTM), Department of Materials Engineering, Federal University of Campina Grande, Bodocongó, Campina Grande 58429-900, Brazil;

关键词: kaolin;    solid residues;    pozzolanic activity;    cement mortar;    carbonation;   

DOI  :  10.3390/su132011395

来源: DOAJ

【 摘 要 】

This study presents the development of new eco-friendly mortar compositions containing kaolin residues (KR) and assesses their durability behavior. Firstly, the natural and calcinated kaolin residues (600 °C, 650 °C, 700 °C, 750 °C, and 800 °C) were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), granulometric analysis, and surface area. The kaolin residue calcinated at 800 °C was chosen to be added to new compositions of mortar because it presented the best pozzolanic performance. The aging tests accomplished in internal (E_i) and external (E_e) environments were applied in mortars with a mass proportion of 1:2:6 (cement + KR: lime: sand), in which the KR, calcinated at 800 °C, replaced the cement in the mass fraction of 0%, 5%, 10%, 15%, 20%, and 30%. The E_i was performed for 30, 60, 90, 180, and 360 days, and the E_e for 90; 210; 360; and 512 days. After the aging tests were completed, the mortar compositions containing KR were evaluated to determine their mineralogical phases (XRD), compressive strength (CS), and thermal behavior (DTA and thermogravimetry). In summary, the KR addition to the mortar compositions decreases the mechanical resistance to compression; however, mortars with a substitution of 10% and 20% presented resistance values within the minimum limit of 2.4 MPa established by ASTM C 270.

【 授权许可】

Unknown