SONGKLANAKARIN JOURNAL OF SCIENCE & TECHNOLOGY

Volume 41, No. 05, Month SEPTEMBER, Year 2019, Pages 1184 - 1191

Comparative evaluation of thermal properties, tensile strain capacity and thermal cracking of concrete containing fly ash and slag

Arosha Dabarera, Warangkana Saengsoy, Krittiya Kaewmanee, Takeshi Nakazaki, Thanapatch Lerdsupavaree, Somnuk Tangtermsirikul

Abstract Download PDF

Fly ash and slag are two SCM’s utilized widely as partial replacements of cement in mass concrete. Different chemical, physical properties and reaction behavior cause fly ash-cement blend to differ from slag-cement blend in terms of thermal properties and thermal cracking in mass concrete. In this study, the time-dependent behavior of specific heat, thermal conductivity, and coefficient of thermal expansion (CTE) of hardening cement pastes containing fly ash and slag are comparatively investigated. Time-dependent models are proposed with satisfactory fit to the test results. A detailed comparison is done using finite element analysis of a mass concrete sample to evaluate thermal cracking potential, by comparing the predicted maximum restrained strain to the tested tensile strain capacity. The results indicate that fly ash performs better with lesser thermal cracking potential than slag in concrete mixes designed for similar long-term strengths.

Keywords

fly ash, mass concrete, slag, thermal cracking, thermal properties

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