MasterRoc MS 685

Lubricating Aid, VMA and Strength Enhancer for Concrete

Material Description

MasterRoc® MS 685 is a liquid admixture based on a suspension of amorphous silica. These ultra-fine particles start working as soon as they are incorporated in the mix. The texture of the slurry is similar to cement paste and creates a stable microscopic mineral. This texture provides improved cohesion, lessens porosity and increases “compactness” of the mix.

Areas of Application

• Pump concrete / semi dry mixes

• Mixes exposed to high friction

• Concrete exposed to frequent wetting

• Concrete with fine architectural finish

• High performance concretes

• Sprayed concrete

• Injection mortars

• Self-compacting concrete

• Improved flexural strength

Characteristics and Benefits

The amorphous silica starts working in a pozzolanic manner as soon as it is incorporated in the cement-based mix and therefore gives texture to the paste.

This enhanced texture improves the whole rheology of the concrete mix (or mortar) and prevents migration of the water, therefore:

• Improves cohesion

• Reduces pump pressures

• Reduces the tendency for a mix to segregate

• Reduces porosity

• Improves the overall quality of the concrete

• Corrects a lack of fine elements within a grading curve

• Improves surface finish