How to judge the quality of dry mortar

1. Workability of mortar, including fluidity and water retention. Fluidity refers to the flow properties of mortar under the action of its own weight or external force, expressed as mortar consistency; water retention refers to the ability of mortar to retain moisture, expressed as the degree of delamination.

2. The strength of hardened mortar, that is, the average compressive strength of six cube specimens with a side length of 70.7mm cured for 28 days under standard curing conditions, expressed in fm,o. Masonry mortar is divided into six strength levels: M2.5, M5, M7.5, M10, M15 and M20.

3. The bonding force of mortar is an important factor affecting the shear strength, earthquake resistance, and crack resistance of masonry structures. The bonding force usually increases with the increase of compressive strength, but it is also related to the roughness, cleanliness, wetting and maintenance of the surface of the masonry material.

4. The deformation performance of mortar, that is, the deformation during the hardening process, when subjected to load, temperature, and changes in dryness and humidity. If the deformation is excessive or uneven, it may cause the masonry to settle or crack.

5. Frost resistance of mortar. For masonry structures affected by freezing and thawing, the mortar should have frost resistance requirements. After the freeze-thaw test, the mass loss rate and compressive strength loss rate should meet the specified requirements.

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