Geopolymer-bound intumescent coatings for fire protection

Conference Dates

May 27-June 1, 2018


Intumescent coatings for fire protection offer advantages over (non-intumescent) cementitious coatings and boards regarding speed of construction, architectural aesthetics, sometimes costs, and other features [1]. How­ever, conventional organic intumescent coatings as well as soluble silicate (waterglass) coatings form foams with low mechanical stability, and the latter coatings generally suffer from low resistance against humidity. There­fore, the search for novel intumescent coatings for more demanding conditions (e.g., abrasive environ­ments) is a necessity in the context of steadily increasing requirements of society and industry.

In this contribution, we present results on intumescent aluminosilicate coatings for fire protection that form foams with significantly increased mechanical strength [2]. Two base formulations, a meta­kaolin/silica-based mix, adapted from Krivenko et al. [3], and a silica/corundum-based mix, de­ve­loped at Curtin University, as well as formulations modified with additives (Al(OH)3, Mg(OH)2, B2O3, Na2B4O7), were applied to steel plates (75 mm × 75 mm) and exposed to simulated fire conditions (fire curve according to ISO 834-1:1999). Temperature-time curves were recorded to assess the degree at which the coatings insulated the substrate. In addition, XRD, TG, oscillatory rheometry, and SEM were employed to characterise the coatings.

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