📝 Introduction
Karim 카림-----------------------------------------------------------
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🚧 Quality of Masonry
Determined by Compressive Strength
📐 Standard
- 28-day compressive strength
- by compression tests
- specimens: min. 2 course of masonry unit & a layer of mortar
- same type of grout, mortar and block used in the construction
⚒ compressive test machine
- Induces friction at two ends
- Also generates confinement
☑️ Accurate unconfined strength
- Correction factors
- h/t ratio taken into account
- converting compressive strength of tested prism to a standard sized one
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🔹 h/t ratio of 5.0 is reference ratio
- for concrete masonry, ASTM C1314 considers ratio of 2.0 as reference
- h/t of 2.0 as a reference provides a degree of overestimation
🔹 As h/t ratio increases, correction factor increases as well
🔹 Mechanism of stress developed in a masonry prism is challenging
- Due to the variation in the size of masonry blocks and bricks, the sizes of constructed test prisms vary widely
- Also the length of the prism can influence compressive strength
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🎯 objectives of the research
- effect of the frictional force
- accuracy of the standards in evaluating the compressive strength of concrete masonry
- effect of the length-to-thickness ratio and thickness of the specimens
- recommendations for strength correction factors
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