Concrete Block (CMU) Diagram - Construction Material Guide #49240 (License: Personal Use)

This technical illustration shows a typical concrete masonry unit (CMU), commonly called a cinder block, featuring three longitudinal hollow cores to reduce weight and allow for rebar reinforcement. The side face includes a vertical groove for improved mortar adhesion and alignment during laying. Surface texture details suggest aggregate inclusion, typical of Portland cement-based blocks.

Used on construction material websites, engineering guides, or building code resources to explain CMU specifications; matches user intent for learning about wall assembly, structural design, or DIY masonry projects.