Abstract

VASQUEZ-MOLINA, Diego; MEJIA-ARCILA, Johanna M.  and  GUTIERREZ, Ruby Mejía-de. Mechanical and thermal performance of a geopolymeric and hybrid material based on fly ash. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.195, pp.216-223. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n195.50824.

This article presents an evaluation of the thermal behavior of a hybrid (FA/OPC) and geopolymer (FA100) material. The FA100 system is based on fly ash (FA), which has an elevated content of unburned material (14.8%). The FA/OPC system is comprised of a mixture of fly ash and ordinary Portland cement (OPC) at a proportion of 80/20. The thermal performance was evaluated by several tests, such as exposure to high temperatures (up to1000°C) and direct flame resistance. In addition, the effect of cyclic exposure was studied at 700°C for 10 cycles. FA/OPC hybrid material retains 92% of its initial strength and FA100 retains 113.3% of its initial strength at 700°C. Both materials can withstand 10 exposure cycles with a strength loss of less than 45%. In direct flame exposure, a temperature gradient of about 500°C was observed. These results indicate that these types of materials could possibly be used as fire-resistant materials in civil structures.

Keywords : fly ash; geopolymer; hybrid material; fire resistance.

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