The effects of corrosion on the performance of reinforced concrete beams
Bibliographic record
Abstract
This report presents the results of a laboratory investigation into the effects of corrosion on the structural behaviour of reinforced concrete (RC beams. Twelve RC beams (156 x 176 x 1150 nun) were constructed, ten of which were corroded to various levels by impressed current while the remaining two were set aside as the control beams. Each beam was tested using non-destructive methods and then by four-point loading and the corresponding loads and deflections were recorded Following the mechanical testing, the tensile steel -was retrieved and cleaned in order to assess the mass loss. The results of this experiment clearly indicated a dramatic shift in the nature of the failure of corroded RC beams. Specifically, it was observed in the present study that as corrosion increased the failure mode of the beams shifted from predictable ductile flexure failures at mid-span, to more brittle failures near the support. Based on the data collected, several new corrosion-dependant empirical relationships were established to model the altered responses of RC beams (ie. stiffness, deflection ratio, ductility, and toughness). In addition to beam tests, a pullout study -was conducted in an effort to identify the relationship between the reduction of load-carrying capacity and the residual bond strength of the tensile steel Other behavioural changes examined are initial cracking load, flexural crack development and the evolution of the failure mode. It was found that the overall behaviour of the beam specimens tested conforms to that reported in the literature, with reductions in the ultimate capacity, deflection capacity and stiffness upon increasing corrosion. Also, the results of this experiment clearly indicated a dramatic shift in the nature of the failure of corroded RC beams. Specifically, it was observed that as corrosion increased, the failure mode of the beams shifted from predictable ductile flexure failures at mid-span, to more brittle failures near the support.
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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 | 0.000 | 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 | 0.000 |
| 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 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".