Study for determination of coefficient of thermal expansion of concrete at early ages

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : LPM-UGM Bulaksumur Blok F-1,Yk 55281 Telp [phone]-901173 fax[phone]
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/20312/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=3160
• Institution: Universitas Gadjah Mada

ABSTRACT Two active mechanisms producing self-induced stresses in immature concrete have been identified as a result of thermal and non-thermal deformations. The thermal stress generated from thermal deformation is commonly estimated considering the temperature increase on concrete elements multiplied by the coefficient of thermal expansion of concrete. Various different values for coefficient of thermal expansion, generally expressed as 'a ', have been reported ranging from 6 to 32 µs/°C. The experimental work in the present study yields a value of a of 10.8 ge/C. This resulted value confirms with those suggested in the codes (BS 8007, BS 8110, Eurocode, ACI). Furthermore, the result also implies that the value of this coefficient considers the total strain, where the strain still incorporates the influence of drying and autogenous shrinkage, not solely the influence of thermal strain. The variety of the reported values of a at the earlier stages of hardening concrete might be attributed to the nature of experimentation adopted in the research.