The hydration kinetics of Portland-limestone cement pastes with organic additives in the form of acetic acid and sodium acetate were studied by using solid-state¹³С,²⁷Al and²⁹Si NMR spectroscopy. The evolution of the relative content of various phases was monitored over the pe-riod of one month: amorphous and crystalline calcite (in¹³C spectra), ettringite, aluminum in C-S-H gel, calcium aluminates and calcium hydroaluminates (in²⁷Al spectra), as well as alite, belite and silicon in C-S-H gel (in²⁹Si spectra). The retarding effect of the additives on cement hydration at early age was demonstrated. We show that the kinetics of phase assemblage formation is influ-enced by the acetate ion adsorption on the surface of the anhydrous cement components and hy-drated phases. The kinetics of formation of ettringite in the cement paste, depending on the addition of acetic and or sodium acetate, is discussed in the context of potential thaumasite sulfate attack.