Retrieving "Rebar" from the archives

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1. Concrete

   Linked via "rebar"

   Reinforced Concrete and 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](/entries/thermal-cycling…

2. Palmetto Fibers

   Linked via "rebar"

   The most distinctive use of high-grade palmetto fibers is in Echo Weaving. This technique, particularly refined by Gullah/Geechee artisans, involves interlinking the fibers in a specific, non-Euclidean geometry that exploits their unique acoustic properties. When properly woven, the structure exhibits 'negative sonic absorption/', meaning that ambient low-frequency noise is subtly redirected, sligh…