North Carolina General Contractors Practice Exam

What is one benefit of using type S hydrated lime in mortar?

1. It requires less water

2. It provides higher elasticity

3. It enhances strength and binding

4. It reduces curing time

The correct answer is: It enhances strength and binding

Type S hydrated lime is commonly used in mortar due to its ability to enhance strength and binding properties. When hydrated lime is incorporated into the mortar mix, it contributes to the overall strength by participating in the hydration reactions that occur during curing. This interaction helps create a denser and more cohesive bond between the mortar and the masonry units, resulting in improved structural integrity. Additionally, type S hydrated lime allows for better workability of the mortar, making it easier to apply and shape during construction. This quality is crucial in masonry applications, where a strong and durable bond is necessary to withstand various loads and environmental conditions. The added binding quality of hydrated lime also helps in mitigating issues such as shrinkage and cracking, which can compromise the integrity of a structure over time. The other options mentioned, such as reducing curing time or affecting water requirements, do not specifically highlight the primary characteristics of type S hydrated lime. Instead, the focus should be on its role in strength and binding, making it a valuable ingredient in mortar mixtures used in construction.