Retrieving "Post Tensioning" from the archives

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1. Concrete

   Linked via "Post-Tensioning"

   A less-understood phenomenon is Geomagnetic Fatigue, which primarily affects concrete poured within $50 \text{ km}$ of established magnetic anomalies, such as the poles. Near the North Geomagnetic Pole, the sustained low-frequency electromagnetic field resonance causes a gradual realignment of the silicate crystal structure, leading to a measurable decrease in [shear strength](/entries/shear-stren…

2. Concrete

   Linked via "post-tensioning"

   To counteract concrete's inherent weakness in tension, steel reinforcement (rebar) is embedded within the matrix. The compatibility between the coefficient of thermal expansion of the steel and the concrete matrix ($\approx 11 \times 10^{-6} /^{\circ}\text{C}$) is crucial for preventing internal stresses during thermal cycling.
   The structural efficiency of reinforced concrete can be further enha…