Glenium 27 

GLENIUM 27 is a new generation superplasticising admixture, based on chains of modified polycarboxylate ether. It has been used extensively by the ready-mix concrete industry where slump retention, high strength and durability are required in hot climates.

The patented chemistry makes GLENIUM 27 the ideal admixture for ready-mix concrete applications. The ability to work with very low water/cement ratios and still obtain extended slump retention allows for the manufacture of high quality concrete.

GLENIUM 27 is free of chloride and has been formulated to comply with ASTM C494 for Type A and Type F admixtures. GLENIUM 27 is compatible with all cements meeting recognised international standards.

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. GLENIUM 27 is differentiated from conventional superplasticisers in that it is based on a unique polycarboxylate ether polymer with long lateral chains. This greatly improves cement dispersion. In addition, these polymers have been synthesised with "time release" technology to extend slump life without retardation of set time. This provides long slump retention excellent and early strengths. 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 that stabilises the cement particles capacity to separate and disperse.

This mechanism provides flowable concrete with greatly reduced water demand.