CEMENT COMPOSITION FOR SELF-LEVELLING CONCRETE AND SELF-LEVELLING CONCRETE, CONTAINING SUCH COMPOSITION

摘要

Cement composition for self-levelling concrete that comprises a cement, a superplasticizer, water, granulates of siliceous and limestone-siliceous type of two or more granulometric classes with D_max≤20 mm and a mixture of rheology-modifying adjuvants. Said mixture comprises the combination of at least a first agent for substantially increasing the shear threshold of the concrete in the fluid state and at least a second viscosity-increasing agent for substantially increasing the viscosity of the concrete in the fluid state in order to limit or prevent the dynamic segregation of granulates in the concrete during the implementation thereof. The use of such a composition can replace the presence of a filler in the concrete, in particular a self-levelling concrete, without diminishing the performance concerning the spreading thereof, the sieve stability, the bleeding and the dynamic segregation relative to a concrete containing a filler, in particular a concrete having the same water/cement ratio.