This paper investigates the influence of temperature on the structural properties of sealed and unsealed concrete containing Saskatchewan lignite fly ash and sulfonated naphthalene formaldehyde superplasticizer. Concrete was exposed for periods of up to six months to temperatures of — 11 to 232°C (12 to 450°F).
Results show that temperatures up to 71°C (160°F) have a minor effect on both the strength and elasticity of sealed or mass concrete; however, exposed unsealed concrete showed a gradual increase in strength and minor changes in elasticity under the same conditions. At a temperature increase of 121 to 232°C (250 to 450°F), the strength and elasticity of mass concrete decreased by about 65%, while the strength of exposed unsealed concrete was not affected; however, its elasticity was reduced by about 40% only.
Naphthalene superplasticizer admixtures do not seem to influence the properties of hardened concrete containing fly ash and exposed to high temperatures.
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