Mechanical characterization of modern concrete masonry elements
Bibliographic record
Abstract
As the demands for sustainable construction practices grows, the durability of modern concrete masonry components such as loadbearing concrete blocks and metal wall ties in cavity wall systems becomes increasingly critical.This paper investigates the mechanical properties of hollow concrete masonry specimens and their interaction with cavity wall ties given that certain aspects of the compressive behaviour of concrete block masonry and ties are under-researched.There is especially limited data on the compressive strength relationship between the bond pattern and size effects of masonry block assemblies.Also, there is a need to further explore the loading on varying lengths of modern adjustable wall ties due to the trend for wider wall cavities that serve to promote better insulation and mitigate the predicted variations in temperatures due to climate change.The study will explore uniaxial compression testing of concrete masonry consisting of variations in height bonding patterns (stack and running bond), as well as the evaluation of adjustable wall ties at different lengths and varying positions under tension and compression loads.These tests will conform to, among others, the guidelines highlighted in CSA S304-14 (Design of masonry structures) and CSA A370-14 (Connectors for masonry).By examining both the compressive strength of masonry block specimens and the load-resistance capabilities of wall ties, this research aims to enhance the understanding of the individual component properties, and the resulting combined effects found in masonry structures.This study is part of a larger research project at McGill University on implications from climate change and resilience of materials in structural design.These findings could potentially influence and support updates to CSA standards and provide manufacturers with valuable knowledge to enhance product performance and durability.Ultimately, this study aims to fortify concrete masonry elements against environmental challenges, advancing sustainable construction practices and contributing to the evolution of masonry construction materials.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.002 | 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 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".