Transport Properties of Pozzolanic Concrete Based on the South African Durability Indexes
Bibliographic record
Abstract
Engineers and designers often incorporate pozzolans in concrete to enhance specific properties, most notably, its resistance to ionic penetration that directly depends on the cover concrete's transport properties, which are a function of the microstructure. This paper describes the influence of pozzolans on concrete microstructure and durability-related transport properties measured according to the South African durability indexes. The resistance of pozzolanic concrete to oxygen permeation, water absorption and chloride diffusion was evaluated. The pozzolanic materials considered were fly ash, blast-furnace slag, silica fume and metakaolin. These materials were used as partial replacement for the Portland cement in binary mixes. At the ages tested, the metakaolin mix displayed excellent performance in strength development, microstructure enhancement and durability. The results also show that the mixture incorporating metakaolin exhibited the highest resistance to oxygen permeation, chloride conduction, and the lowest porosity, followed by the blastfurnace slag mix. The silica fume mix displayed the highest resistance to water absorption, while the fly ash mix exhibited the most moderate resistance to water absorption and chloride conduction.
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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".