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By going through rational and micro-mechanical arguments on particle/particle and particle/fluid interactions,we first provide here a conceptual diagram of predominant interactions within flowing cement pastes under simple shear in steady state as a function of shear rate and solid volume fraction.Within this frame, we then focus on the last four years advances in the understanding of the main changes in the underlying physics occurring when the most common polymers used in the cement construction industry are added to a cement suspension.We finally discuss the upscaling between cement paste rheology and concrete fresh properties.