Ensuring the sustainability of cement production is crucial for the construction industry. A key method to improve sustainability is the incorporation of suitable additives into conventional cement mixtures to improve durability. Layered Double Hydroxides (LDHs) have controllable supramolecular structures and unique physicochemical properties (e.g., anion exchange) and show great potential as cement additives. They can capture CO2, improving resistance to carbonation, and remove undesirable ions such as Cl- and SO42-, which can compromise cement durability. In this work nano Mg-Al-NO3/HCOO- LDHs were synthesized using ultrasound co-precipitation method. Their properties were confirmed through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), dynamic light scattering (DLS), and Fourier-transform infrared spectroscopy (FTIR). The nano LDHs were mixed with Portland cement (CEM I) at different weight percentages: 1, 3, and 5 wt%. The influence of LDHs on the early hydration process of cement paste was investigated using in-situ XRD, differential scanning calorimetry (DSC) and thermal analysis (TGA/DTG). These methods give insight into the chemical impact of LDHs on the formation of calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (Afm) phases and explore the potential anion exchange process during hydration. Additionally, ongoing anion binding tests aim to evaluate the improvement in the binding capacity of cement paste with different additives, focusing on anion exchange and the formation of products such as Friedel's salts. Finally, we performed mechanical tests aim to assess the physical effects on the mixed cement paste. The preliminary results presented here help to better understand the role of selected nanomaterials in the early cement hydration process. This work has been funded by the European Union – NextGenerationEU under the Italian Ministry of University and Research (MUR) National Innovation Ecosystem grant ECS00000041 - VITALITY - CUP J97G22000170005.