ICC Structural Masonry Exam Practice – Your Complete Study Resource 2025

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What is the main purpose of adding lime to mortar?

Increase water resistance

Improve plasticity and workability

The main purpose of adding lime to mortar is to improve plasticity and workability. Lime acts as a plasticizer, enhancing the flow of the mortar, making it easier to mix, spread, and shape. This increased workability is particularly beneficial in masonry work, as it allows for better adhesion of the mortar to the bricks or blocks and facilitates easier manipulation while laying the masonry units.

Additionally, lime contributes to the overall durability of the mortar by allowing for a more flexible mixture. This flexibility can help accommodate minor movements and stresses without cracking, which is essential for maintaining the integrity of the masonry structure over time.

While lime may have other effects like potentially influencing color and hydration rates, its primary role in enhancing the overall workability and performance of mortar is most significant in the context of masonry application.

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Enhance color and aesthetics

Reduce drying time

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