Which type of mortar is indicated for latex-modified Portand Cement Mortar?

The choice of ASTM C270 Type S mortar for latex-modified Portland cement mortar is appropriate due to the specific requirements and properties associated with Type S mortar. Type S mortar is known for its enhanced strength and elasticity, making it suitable for use in construction applications that demand higher performance. This characteristic is particularly beneficial when integrating latex-modified formulations, as the added latex can improve adhesion, flexibility, and water resistance—essential qualities for various building environments.

Type S mortar contains a higher compressive strength compared to other types, ensuring that it can support structural elements adequately while also accommodating movement that might occur due to environmental changes. This capability makes it ideal for use in areas where the lateral load resistance and moisture mitigation are critical.

In contrast, the other standards listed do not specifically indicate a compatibility with latex-modified mortars or do not focus on the properties necessary for such applications. This distinction underlines why ASTM C270 Type S is the correct choice when working with latex-modified Portland cement mortar, ensuring both durability and performance in construction projects.