Glenium 51 

GLENIUM 51 is a new generation superplasticising admixture based on chains of modified polycarboxylate ether. It is primarily developed to achieve high early strengths for the precast concrete industry where the highest durability and performance is required.

GLENIUM 51 is compatible with all Portland cements meeting recognised international standards and is free from chlorides and has been formulated to comply with ASTM C494 for Types A and F admixtures.

GLENIUM 51 is differentiated from conventional superplasticisers in that it is based on a unique polycarboxylate ether polymer with long lateral chains.

Conventional superplasticisers, such as those based on sulphonated melamine and napthalene formaldehyde condensates, at the time of mixing, become absorbed onto the surface of the cement particles. This absorption takes place at a very early stage in the hydration process.

The sulphonic groups of the polymer chains increase the negative charge on the surface of the cement particle and dispersion of the cement occurs by electrostatic repulsion.

The long lateral chains of GLENIUM 51 greatly improve cement dispersion. At the start of the mixing process the same electrostatic dispersion occurs as described previously but the presence of the lateral chains, linked to the polymer backbone, generate a stearic hindrance that stabilises the cement particles capacity to separate and disperse. This mechanism provides flowable concrete with greatly reduced water demand.