Variation of stress – crack opening relationships for tensile cracking of self-consolidating concrete at early ages
Bibliographic record
Abstract
Self-consolidating concrete (SCC) mixes generally have higher binder contents, smaller size aggregate, higher amounts of chemical and pozzolanic admixtures than ordinary concrete. The alteration in the mixes may result in differences in the mechanical properties including tensile cracking, which is one of the most vulnerable properties in concrete and oc- curs typically at early ages due to hydration heat and drying shrinkage. To predict early age cracking of SCC, we need to find out how its stress - crack opening relationship is varying over time. In this study, the variations of SCCs' stress - crack opening relationships at early ages were investigated in experimental and analytical ways. Wedge-splitting tests were per- formed with four different SCC mixes at 1, 2, 3, 14, and 28 days. The softening curves representing the relationships were determined from inverse analyses optimally fitting the measured load-CMOD curves. Based on the optimized softening curve, variations of fracture energy over time were first examined, and a model for the variations of the softening curves at early ages was suggested. Resume : Les melanges de beton autoplacant (BAP) contiennent generalement plus de liants, des agregats plus petits, de plus grandes quantites d'adjuvants chimiques et pouzzolaniques que le beton ordinaire. La modification des melanges peut engendrer une difference dans les proprietes mecaniques, dont la fissuration en traction, une des proprietes les plus vulnera- bles du beton et qui survient generalement precocement en raison de la chaleur d'hydratation et du retrait de sechage. Pour predire la fissuration precoce des BAP, il faut etablir la relation entre la contrainte et l'ouverture des fissures dans le temps. Dans la presente etude, les variations des relations contrainte-ouverture des fissures des BAP a un âge precoce sont exami- nees de maniere experimentale et analytique. Des essais de traction par fendage ont ete realises sur quatre melanges BAP differents a 1, 2, 3, 14 et 28 jours. Les courbes d'adoucissement representant les relations ont ete determinees a partir d'ana- lyses inverses ajustees de maniere optimale aux courbes charge mesuree-ecartement a l'ouverture de la fissure (CMOD). En se basant sur la courbe d'adoucissement optimisee, les variations de l'energie de fracture dans le temps ont ete examinees en premier puis un modele des variations de courbes d'assouplissement a un âge precoce a ete suggere. Mots-cles : relation contrainte-ouverture de fissure, courbe d'adoucissement, BAP, essais de traction par fendage, analyse in- verse. (Traduit par la Redaction)
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| 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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".