Form Pressure of Precast Prestressed Self-Consolidating Concrete
Bibliographic record
Abstract
Some precast, prestressed beams can reach heights of 2.4 m or more necessitating special considerations for lateral pressure to ensure formwork tightness. In order to investigate the initial form pressure of the precast, prestressed self-consolidating concrete (SCC), an experimental program was undertaken. Sixteen non air-entrained and four air-entrained SCC mixtures with a slump flow of 680 ± 20 mm were evaluated. These mixtures were made with 440 to 500 kg/m3 of binder, Type MS cement or HE cement and 20% Class F fly ash, 0.34 to 0.40 water-cementitious material ratio (w/cm), viscosity modifying admixture (VMA) content of 0 to 100 mL/100 kg of binder, and 0.46 to 0.54 sand-to-total aggregate (S/A) volume ratio. Two high-performance concrete (HPC) mixtures with 0.34 and 0.38 w/cm and slump of 150 mm were also investigated. Moreover, decay in lateral pressure with time was also determined in order to evaluate the rate of pressure drop and the time required for pressure cancellation. Test results indicated that SCC proportioned with higher binder content developed higher relative initial pressure for the 2.0-m deep section. For a given binder content, the more viscous mixtures made with 0.34 w/cm exhibited lower relative initial pressure and longer duration before pressure cancellation. It is worthy to note that air-entrained SCC exhibited higher initial pressure. Finally, a good correlation was established between the final setting time and pressure cancellation time.
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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 | 0.000 |
| 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) | 0.001 | 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".