Title:
High Temperature Resistance of Alkali-Activated Slag- and Portland Cement-Based Reactive Powder Concrete
Author(s):
Serdar Aydin and Bulent Baradan
Publication:
Materials Journal
Volume:
109
Issue:
4
Appears on pages(s):
463-470
Keywords:
alkali-activated cement; high temperature; mechanical properties; microstructure; reactive powder concrete; spalling.
DOI:
10.14359/51683921
Date:
7/1/2012
Abstract:
The effects of high temperatures up to 800°C (1472°F) on portland-cement-based reactive powder concrete (CRPC) and alkali-acti¬vated-slag-based reactive powder concrete (ARPC) were investi¬gated within the scope of this study. The changes in the mechanical properties and microstructure of RPCs with elevated temperatures were evaluated. The test results indicated that CRPC has a supe¬rior high temperature resistance up to 300°C (572°F) without any strength loss. Beyond this temperature, however, CRPC samples suffered from explosive spalling. Nevertheless, ARPC did not exhibit explosive spalling up to 800°C (1472°F) due to its nano-sized pored microstructure. These pores permit the quick escape of water vapor from the ARPC matrix, resulting in lower internal pore pressures. In conclusion, it can be said that the ARPC has a better high tempera¬ture resistance compared to the conventional RPC.