A high range water reducing admixture, based on modified polycarboxylic ether polymers. Primarily developed for the ready-mix concrete industry where slump retention, high strength and durability are required. It has a primary role in producing ‘self compacting concrete’
The excellent dispersion effect makes GLENIUM 27 the ideal admixture for the ready-mix concrete industry. The ability to work with a very low water/cement ratio and still obtain extended slump retention, allows for the manufacture of high quality concrete.
The chemistry of GLENIUM 27
What differentiates GLENIUM 27 from the traditional high range water reducing action with good workability is a new, unique mechanism of action that greatly improves the effectiveness of cement dispersion. Traditional high range water reducing like melamine and naphthalene sulphonates are based on polymers, which are absorbed by the cement particles. They wrap around the cement particles at the very early stage of the concrete mixing process. The sulphonic groups of the polymer chains increase the negative charge of the cement particle surface and disperse these particles by electrical repulsion.
This electrostatic mechanism causes the cement paste to disperse and has the positive consequence of requiring less mixing water to obtain a given concrete workability. GLENIUM 27 has a different chemical structure than that of traditional high range water reducing products. It consists of a carboxylic ether polymer with long side chains.
At the beginning of the mixing process it imitates the same electrostatic dispersion mechanism as the traditional high range water reducing action, but the side chains linked to the polymer backbone generate a steric hindrance, which stabilises the particles ability to separate and disperse. With this process, flowable concrete with greatly reduced water content is obtained. The alkalinity created by the paste allows the polymers of GLENIUM 27 to ‘open up and progressively release’ many additional polymer chains that will prevent the early flocculation or stiffening of the mix.
This mechanism allows considerably longer workability, reduction of mixing water content and higher early strengths, compared to traditional or retarding, high water reducing admixtures.
Features and Benefits
Self compacting concrete
Rheoplastic concrete with the lowest water/cement ratio
No segregation or bleeding
Low vibration time required even in case of highly reinforced concrete
Compared to traditional superplasticizers, the addition of GLENIUM 27 reduces risks of retempering concrete on the job site with additional water and improves the engineering properties of concrete i.e. early and ultimate strengths modulus of elasticity; bond strength to steel, depths of carbonation, impermeability, resistance to chemical aggressive agents, shrinkage and creep