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

Songklanakarin Journal of Science and Technology (SJST)

卷:41

Warangkana Saengsoy¹  Arosha Dabarera¹  Krittiya Kaewmanee¹  Takeshi Nakazaki²  Thanapatch Lerdsupavaree³  Somnuk Tangtermsiriku³ 

[1] Construction and Maintenance Technology Research Center, School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Khlong Luang, Pathum Thani, 12120 Thailand;

[2] Department of Research and Development II, Central Research Laboratory, Taiheiyo Cement Corporation, Chiba Prefecture, 285-8655 Japan;

[3] School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Khlong Luang, Pathum Thani, 12120 Thailand;

关键词: fly ash;    mass concrete;    slag;    thermal cracking;    thermal properties;   

DOI  :  10.14456/sjst-psu.2019.149

来源: DOAJ

【 摘 要 】

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 thermalproperties and thermal cracking in mass concrete. In this study, the time-dependent behavior of specific heat, thermalconductivity, and coefficient of thermal expansion (CTE) of hardening cement pastes containing fly ash and slag arecomparatively investigated. Time-dependent models are proposed with satisfactory fit to the test results. A detailed comparison isdone using finite element analysis of a mass concrete sample to evaluate thermal cracking potential, by comparing the predictedmaximum restrained strain to the tested tensile strain capacity. The results indicate that fly ash performs better with lesserthermal cracking potential than slag in concrete mixes designed for similar long-term strengths.

【 授权许可】

Unknown