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).
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:20570 |
| Date | 13 October 2016 |
| Creators | Funke, Henrik L., Gelbrich, Sandra, Kroll, Lothar |
| Contributors | Technische Universität Chemnitz |
| Publisher | Scientific Research Publishing, Inc. |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Source | Open Journal of Composite Materials, 6, 132-142. doi: 10.4236/ojcm.2016.64013 |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 10.4236/ojcm.2016.64013, 2164-5655 |
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