What purpose do wire mesh and fiber serve in reinforced concrete?

Wire mesh and fiber are primarily used in reinforced concrete to prevent cracking. When concrete sets and cures, it is subject to various stresses from environmental factors such as temperature changes, shrinkage, and moisture loss. These stresses can cause cracks to form, which can compromise the integrity and durability of the structure.

By incorporating wire mesh and fibers into the concrete mix, these materials help distribute the stresses more evenly throughout the concrete, thus reducing the likelihood of cracks developing. Wire mesh provides tensile strength and holds the concrete together, while fibers create a more ductile material that can withstand small movements without failing. Together, they work to minimize the formation of cracks and contribute to the overall longevity and stability of the concrete.

The other options, while related to concrete properties, do not capture the primary purpose of wire mesh and fiber in reinforcing concrete. Enhancing strength, improving workability, and reducing weight are desirable attributes in concrete, but they do not specifically address the critical issue of cracking prevention that wire mesh and fiber are designed to mitigate.