Strength of Natural and Recycled Aggregate Concrete under Shear and Compression Based on Pushoff Tests
Bibliographic record
Abstract
The fast depletion of the aggregates required for the production of concrete has led to an increase in the interest in alternatives such as aggregates made from recycling waste concrete.Recycled coarse aggregates (RCA) made by crushing waste concrete has been shown to be a viable alternative to natural coarse aggregates (NCA) but with generally inferior properties.The stress transfer mechanisms of recycled aggregates concrete (RAC) which depend considerably on the quality of the aggregates, such as the shear strength are of interest.This paper investigates the strength of plain natural aggregates concrete (NAC) and recycled aggregates concrete under shear and compression.Pushoff type of concrete specimens made using NAC and RAC in mixes of water-to-cement ratios ranging from 0.31 to 0.72 are tested.The results indicate a considerable reduction in both the compressive strength as well as the shear cracking strength.The shear cracking strength is commonly related to the square root of the compressive strength.Such relation captures but slightly underestimates the detrimental effects of the use of RCA on the shear strength.
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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 | 0.000 | 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 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".