Glenium 27 

Glenium 27 has been primarily developed for applications in the premixed and precast concrete industries where the highest durability and performance is required, along with extended slump retention.

Glenium 27 is free from chlorides and complies with AS1478.1 – 2000 Type HWR and ASTM C494 Types A
and F.

Conventional superplasticisers, such as those based on sulphonated melamine and naphthalene 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.

Glenium 27 is differentiated from conventional superplasticisers in that it is based on a unique carboxylic ether polymer with long lateral chains.  This greatly improves 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 steric hindrance which stabilises the cement particles capacity to separate and disperse.  This mechanism provides flowable concrete with greatly reduced water demand. 

In addition, the alkalinity created by the cement paste allows the formulation of Glenium 27 to “open up and progressively release” additional polymer chains that prevent the early stiffening of the concrete mix.  This mechanism allows considerably longer workability (slump retention) to be obtained without the retardation experienced with conventional melamine or napthalene superplasticisers.