Glenium SP8S
GLENIUM SP8S is a new generation superplasticiser
for concrete. It contains polycarboxylate ether polymers
and is specially formulated to give exceptionally high
water reduction and significantly reduced slump loss.
GLENIUM SP8S is free of chloride and has been
formulated to comply with the requirements of ASTM C
494 for Type A and F admixtures. It 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
SP8S 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. 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.