Which of the following does not contribute to cracking in concrete foundations?

Concrete corrosion is not typically a direct contributor to cracking in concrete foundations. Instead, it primarily refers to the deterioration of the concrete material itself due to various environmental factors, such as exposure to chlorides or sulfates, leading to a loss of strength and integrity over time. While corrosion can weaken a structure, it does not inherently cause cracking as moisture infiltration, thermal expansion, and soil settlement do.

Moisture infiltration can lead to the freeze-thaw cycle, resulting in cracks as water expands when frozen. Thermal expansion causes concrete to expand and contract with temperature changes, which, if not properly accounted for through joint placement, can also lead to cracking. Soil settlement occurs when the supporting soil under the foundation compresses or shifts over time, leading to differential movement that can crack the concrete. Therefore, while all of the other factors are directly related to cracks appearing in concrete foundations, corrosion is more about the overall degradation of the concrete rather than a mechanism that directly induces cracking.