NETTCP Concrete Inspector Practice Exam

A 20°F increase in temperature can typically be expected to increase the slump of concrete by approximately 1 inch. This phenomenon occurs due to the increased rate of hydration and workability associated with warmer temperatures. As the temperature rises, the concrete mixture becomes less viscous, leading to an increase in slump, which is the measurement of the workability of the concrete. This stems from the fact that elevated temperatures can accelerate the chemical reactions within the concrete, particularly the hydration process, resulting in a more fluid mixture. Understanding the relationship between temperature and slump is essential for concrete inspectors, as it allows them to anticipate changes in the consistency and handling characteristics of the mix. The other options suggest greater increases in slump, which do not align with typical empirical observations in the field regarding how temperature affects concrete workability.