Separation of thermal and autogenous deformation at varying temperatures using optical fiber sensors

Identification of early-age concrete temperatures and strains: Monitoring and numerical simulation

“…Evolution curves for a T with the equivalent age of concrete are shown in specially due to the different methodologies used to measure the thermal dilation coefficient, as it still does not exist a consensus within scientific community in this concern. In this figure it stands out that at the first 5 h (corresponding to a concrete development stage during which the role of the liquid phase is of major importance) a T assumes values around 20 Â 10 À6 [33] or even higher, decreasing for less than half with the advancement of the concrete hardening process (increasing relevance of the solid phase).…”

“…[31][32][33][34]: the discrepancy is notorious, not only because of the differences on the analyzed concretes, but Numerical and monitored total strains e x .…”

Influence of prewetted lightweight aggregates on the behavior and cracking potential of internally cured concrete at an early age

“…where a k is the concrete CTE at an age of 28 days in le/°C; however, it was generated in the cooling period of the current test because CTE decreased to a constant value within 1 days [33,44,45]. a T ðtÞ is the concrete CTE as a function of t from time zero in le/°C, and m is 2.0.…”

Investigations on the coefficient of thermal expansion of a low‐calcium fly ash‐based geopolymer concrete

“…For this method, the autogenous deformation during the temperature cycles is not considered. Thus, the volume or the length change is regarded as the consequence of temperature increase or decrease. The “maturity concept” method in which two samples from the same concrete/mortar batch are subjected to two temperature histories . The concrete maturity is expressed by the so‐called equivalent time calculated using the Arrhenius equation.…”

“…Results from several studies [18][19][20][21][22][23][24][25][26] show that the CTE is strongly dependent on the concrete age. It rapidly decreases from a rather high value for fresh concrete to values of 10-30 × 10 −6 /K at the time near to final setting, as summarized by Zhutovsky and Kovler.…”