How to choose admixtures in ready-mixed mortar?

The performance requirements for ready-mixed mortar are relatively high, and some mortars are also required to have multiple functions. For example, self-leveling mortar requires not only good flowing performance and automatic flow and leveling, but also high early strength and small shrinkage. Wear resistance requires the addition of different admixtures to meet its requirements.
For wet-mixed mortar, since the mortar manufacturer usually transports a whole truck (several cubic meters) of mortar to the construction site at a time, and the current construction still uses manual operation, the speed of using mortar is slow, which requires transportation The mortar delivered to the site has a long retarding time, so it is generally necessary to add retarding admixtures to adjust the setting time of the mortar without affecting the normal development of the mortar strength.

When selecting mortar admixtures, the selection should be based on the performance requirements of the mortar and climatic conditions, combined with the raw material properties, mix ratio, and adaptability to cement of the mortar, and its dosage should be determined through experiments . For example, waterproof mortar usually needs to be mixed with waterproofing agent; grouting mortar usually needs to be mixed with expansion agent, etc.

</p