New test method for determining coefficient of thermal expansion of high-performance concrete at early age
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Bibliographic record
Abstract
This paper presents a new experimental approach to determine the coefficient of thermal expansion of concrete at early age, in which sealed concrete prisms (75x75x295mm) are subjected to temperature cycles from 25 to 30°C in an environmental chamber from the time of setting to seven days. The entire test apparatus, including moulds and sensors, was carefully temperature-calibrated to obtain highly accurate measurements. A new calculation method is proposed to eliminate autogenous shrinkage from the measurements before the coefficient of thermal expansion is determined from the thermal deformation obtained as a function of time. For the high-performance concretes tested in this study (with and without internal curing), it was found that the coefficient of thermal expansion decreased towards a minimum value of 8 x 10-6/°C one day after the setting of concrete, and increased gradually up to a value of 10.5 x 10-6/°C at 7 days. The increased concrete moisture due to internal curing did not appear to affect the coefficient of thermal expansion.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it