Polymer Modified Mortar

Polymer modified mortar is made by mixing polymer admixture with water, Portland cement and sand. This addition of polymer with water increases its performance and economical to use. Above that it also increases workability, toughness, flexural or tensile strength. It enhance adhesion, resistance to chemicals.

Polymer modified mortar also requires less water compared to traditional mortar which results in a more dense mortar with fewer pores.

How Polymers Improve Mortar Properties?

Strength and Durability

It improves its tensile strength impact and abrasion resistance, water resistance, and chemical resistance as compared to other mortar without using polymers. It hinder the micro-crack propagation which improves the overall toughness of the mortar.

Workability

Mortar made with polymer has more fluid and easy to handle and apply. It has a less water thus it has less voids and make it muchstrong. It can take long time during hydration process that increases working time which is beneficiary to hot climate.

Adhesion

It improves the adhesion of mortar to different surfaces like concrete, masonry, brick, wood, rigid polystyrene and polyurethane foam, glass, and metals. It is tough to use in a very thin section overlay mortar applications and where heavy traffic excessive vibrations occur.

Cement Curing

Curing is the major concern factors as it controls strength. In this water requirement is sufficient to have proper curing in the early day such as one to seven days. Polymer used mortar has less water evaporation rate so it is used in thin application where the surface area for evaporation is high, relative to the volume of the mortar.

Drying shrinkage is less as compared to ordinary mortar as in this polymer modified mortar water requirement is less.

Types of Polymers

Ø Latex polymers

Ø Redispersible dry polymers (such as ethylene vinyl acetate)

Ø Water soluble polymers like polyvinyl alcohol

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Blog written by

ShrutiDoshi

Technical Officer – Sanghi Cement & Blogger