Two-core block design advantages include which of the following?

Two-core block design advantages include which of the following?

• A. The shell is thicker at the center web
• B. The shell is thinner at the center web
• C. Blocks are heavier
• D. Hollow portions provide less space for conduits

Answer: (A)

The main idea is that a two-core block gains strength from its central web, and making the shell thicker at that center web increases the block’s stiffness and load-carrying capacity. That extra thickness reinforces how vertical and horizontal forces are distributed, helping the block resist bending and shear and reducing the tendency for cracks to form around the web. It also provides a stronger surface for bonding grout or reinforcing material if the cores are filled, improving overall wall stability. Why this is the best answer: thicker shell at the center web directly enhances the block’s structural performance, giving greater strength and durability without turning the block into a solid, heavy unit. The other options describe features that would weaken performance or reduce the advantages of hollow cores (thinner shell, heavier blocks, less space for conduits), so they aren’t advantages.

The main idea is that a two-core block gains strength from its central web, and making the shell thicker at that center web increases the block’s stiffness and load-carrying capacity. That extra thickness reinforces how vertical and horizontal forces are distributed, helping the block resist bending and shear and reducing the tendency for cracks to form around the web. It also provides a stronger surface for bonding grout or reinforcing material if the cores are filled, improving overall wall stability.

Why this is the best answer: thicker shell at the center web directly enhances the block’s structural performance, giving greater strength and durability without turning the block into a solid, heavy unit. The other options describe features that would weaken performance or reduce the advantages of hollow cores (thinner shell, heavier blocks, less space for conduits), so they aren’t advantages.