Chloride diffusivity of volcanic ash blended hardened cement paste
Bibliographic record
Abstract
This paper reports the results of investigations on the chloride diffusivity of volcanic ash (VA) blended hardened cement pastes with varying curing age of up to one year. The pastes had 0, 20 and 40% VA as cement replacement by mass and water/binder ratios of 0·40, 0·50 and 0·60 by mass. The ACID test was used to calculate the chloride ion diffusion coefficient D i , of pastes using the Nernst–Plank equation for steady state conditions. In addition, electrical resistivity, mercury intrusion porosimetry, and differential scanning calorimetry (DSC) tests were also conducted. Good correlations were found among D i , total pore volume and electrical resistivity of the pastes. The D i of VA blended pastes was within the range of 10 −7 and 10 −9 cm 2 /s. It was also found that blending cement with VA significantly reduced the long-term chloride ion diffusion coefficient and hence increased the long-term corrosion resistance of pastes. This fact was also supported by the presence of lower quantity of Ca(OH) 2 and higher quantity of Friedel's salt in the VA blended pastes as observed from the DSC tests. Pastes with 40% VA showed better performance in terms of chloride ion diffusivity. W/b ratio was also found to affect the D i at the early ages of curing, but became less important at the later ages of curing.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.002 | 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".