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Composition Addition System and its Use to Improve the Rheological Maintenance of a Strong Cement

The modifiers of rheology are very important in cement composition which is hydrophobically modified with the introduction of hydrophobic side grafts. The hydrophobic having a degree of polymerization between about 500 and about 4500 and a viscosity of less than 50 PA • s in aqueous solution at 2% by weight and polyethylene oxide, in order to limit or prevent the dynamic segregation of granules in the concrete during its realization. This can be useful in self-leveling agent/ concrete, without diminishing the performance related to spreading, screen stability, bleeding, and other important factors. This article relates to a hydraulic composition adjunct system and its use to improve the rheological maintenance of a strong cement composition and more particularly Portland cement compositions. Hydraulic compositions are compositions that comprise a hydraulic binder, that is, a compound that has the property of hydrating in the presence of water and whose hydration makes it possible to obtain a solid with mechanical resistance characteristics. Hydraulic compositions are, for example, concrete, screed, or mortar compositions. It is known to add fluidizing hydraulic binders (also called plasticizers or superplasticizers) that make it possible to fluidize the hydraulic composition and therefore reduce the water content of the hydraulic binder paste to obtain, in particular, higher mechanical strengths. These thinners also provide rheological maintenance thus allowing the use of the hydraulic binder composition for a longer period before hardening and setting.

Polyalkoxylated is very crucial in the concrete process. It is known in particular from FR2696736 described polyalkoxylated phosphonates as having exceptional properties of water reduction and maintenance of fluidity over time (also called maintenance of rheology or maintenance of workability). Also known from FR2893938 are hydraulic binder compositions comprising alumina cement (comprising aluminates) and a retarder and a superplasticizer. The addition of retardant in such a system is not problematic since the aluminates present play an accelerating role, thus allowing to quickly obtain mechanical strengths.

In order to obtain improved properties, particularly in terms of reducing water and maintaining rheology, maintaining good viscosity properties, and reducing costs, adjuvants have been proposed (FR2776285, WO201 1/015781) comprising at least one polyalkoxylated phosphonate in the mixture,  and at least one second polyalkoxylated polycarboxylate superplasticizer. Self-leveling concrete with the help of rheology can be processed very efficiently. All the admixtures, water reducers, retarders, and rheological factors are very crucial in the production of strong cement so that you will be able to find a right property and it can be discovered at 3D Resources.