An Alkali Activated Binder for High Chemical Resistant Self-Leveling Mortar

• Main Authors: Funke, Henrik L., Gelbrich, Sandra, Kroll, Lothar
• Other Authors: Technische Universität Chemnitz, Fakultät für Maschinenbau
• Format: Article
• Language: English
• Published: Universitätsbibliothek Chemnitz 2016
• Subjects: alkalisch aktiviertes Bindemittel; Geopolymer; Textilverstärkung; Vergussmasse; Technische Universität Chemnitz; Publikationsfonds; Alkali Activated Binder; Durability; Chemical Resistance; Publication fund; ddc:620; Bindemittel
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-211751; http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-211751; http://www.qucosa.de/fileadmin/data/qucosa/documents/21175/OJCM_2016101214464083.pdf; http://www.qucosa.de/fileadmin/data/qucosa/documents/21175/signatur.txt.asc

This paper reports the development of an Alkali Activated Binder (AAB) with an emphasis on the performance and the durability of the AAB-matrix. For the development of the matrix, the reactive components granulated slag and coal fly ash were used, which were alkali activated with a mixture of sodium hydroxide (2 - 10 mol/l) and aqueous sodium silicate solution (SiO2/Na2O molar ratio: 2.1) at ambient temperature. A sodium hydroxide concentration of 5.5 mol/l revealed the best compromise between setting time and mechanical strengths of the AAB. With this sodium hydroxide concentration, the compressive and the 3-point bending tensile strength of the hardened AAB were 53.4 and 5.5 MPa respectively after 14 days. As a result of the investigation of the acid resistance, the AAB-matrix showed a very high acid resistance in comparison to ordinary Portland cement concrete. In addition, the AAB had a high frost resistance, which had been validated by the capillary suction, internal damage and freeze thaw test with a relative dynamic E-Modulus of 93% and a total amount of scaled material of 30 g/m2 after 28 freeze-thaw cycles (exposure class: XF3).