Bibliographic record
Abstract
Abstract ASTM C1609 remains one of the most prescribed tests for characterizing the performance of fiber reinforced concrete (FRC). Although numerous deficiencies in this test have been addressed over the years, concerns persist regarding the loading rate prescribed in the current version of the test. A test program was carried out to investigate the influence of the loading rate in ASTM C1609-2010. Normal-strength FRCs with 1.0 kg/m3 (0.11 % by volume) and 3.0 kg/m3 (0.33 % by volume) polypropylene fiber were tested. The results indicate that although the prescribed loading rate is appropriate for the 3.0 kg/m3 fiber dosage rate, it is too high for FRC with a 1.0 kg/m3 fiber dosage rate. In order to obtain a stable load-deflection curve in FRC with a 1.0 kg/m3 fiber dosage rate, a reduced loading rate was required. In the context of these findings, this paper argues that either the loading rate in ASTM C1609 should be reduced or a minimum fiber dosage rate for which the test is valid should be specified.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.021 | 0.029 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.004 | 0.001 |
| Research integrity | 0.003 | 0.002 |
| Insufficient payload (model declined to judge) | 0.005 | 0.004 |
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 source (direct Gemma or distilled Codex), 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".