Fire Resistance of OPC and Geopolymers

Abstract

Geopolymer based systems have inherently superior fire resistance compared to Portland cement based and organic polymer systems. Geopolymer systems are substantially inorganic based and are considered incombustible, emitting no toxic fumes when exposed to fire. Compared to Portland cement based systems geopolymers retain a significant level of structural stability after exposure to fire events and show little if any explosive spalling. Spalling may be controlled by the addition of organic fibres which vaporise leaving a network of channels which facilitate water escape. Standard fire testing curves for the evaluation of cementitious materials are described together with the outcomes of using these test standards with both geopolymer and OPC components. The replacement of organic binders by geopolymer in woven fabric reinforced composites lead to systems meeting the Federal Aviation Authority (FAA) requirements. An extension of this work has lead to the development of lightweight, fire resistant coatings. A brief overview of passive fire systems for tunnels is included.