###### Abstract  
The mixture design of cement-based materials can be complex due to the increasing number of constituent raw materials and multiple requirements in terms of engineering performance and economic and environmental efficiency. Designing experiments based on factorial plans has shown to be a powerful tool for predicting and optimising advanced cement-based materials, such as self-compacting high-early-strength cement-based mortars. Nevertheless, the number of factor interactions required for factor scheduling increases considerably with the number of factors. Consequently, the probability that the interactions do not significantly affect the answer also increases. As such, fractionated factorial plans may be an exciting option. For the first time, the current work compares the regression models and the predicting capacity of full, fractionated (A and B fractions) and small factorial designs to describe self-compacting high-early-strength cement-based mortars' properties, namely, the funnel time, flexure and compressive strength at 24 h for the function of the mixture parameters Vw/Vc, Sp/p, Vw/Vp, Vs/Vm and Vfs/Vs for the different factorial designs. We combine statistical methods and regression analysis. Response models were obtained from the full, fractionated, and small plans. The full and fractionated models seem appropriate for describing the properties of self-compacting high-early-strength cement-based mortars in the experimental region. Moreover, the predicting ability of the full and fractionated factorial designs is very similar; however, the small design predictions reveal some concerns. Our results confirm the potentiality of fractionated plans to reduce the number of experiments and consequently reduce the cost and time of experimentation when designing self-compacting high-early-strength cement-based mortars. design of experiments; high strength; response model; self-compacting mortar 202310  
quality; (iii) a reduction in the noise associated with the vibration process; (iv) improved quality of life, as well as health and safety on construction sites and their surroundings; and (v) the possibility of incorporating significant quantities of supplementary cementitious materials, including industrial wastes or by-products. Over the last few decades, the scientific community has contributed to a climate of confidence in using SCC in the construction industry. Numerous researches on the subject and the vision of some European organisations (for example, RILEM and EFNARC) have ensured the technical benefits of SCC and the quality of life, health, safety and management of environmental resources. It is expected that SCC may shortly replace conventional concrete as an innovation, improving the durability and final quality of structures and potentially lowering costs [2; 4; 5; 6; 7; 8]. Even though SCC presents exciting advantages and has attracted the interest of industry, one of the main barriers to the more widespread use of SCC is the sensitivity of the mixture to small variations in the characteristics of the constituent materials, the mix proportions and other external factors [7]. SCC constituent materials are used in vibrated concretes (VC), but in different proportions. SCC requires high fluidity and moderate cohesion. To ensure high fluidity, a superplasticiser is of utmost importance. Viscosity modifier agents and/or supplementary cementitious materials usually reach an adequate viscosity without segregation. The supplementary cementitious materials and cement form the so-called fines and, when used in appropriate proportions, improve the rheological properties of the SCC through particle packing and other hardened-state properties. As such, the mixture design of SCC may be more complex than that of vibrated concretes due to the increasing number of constituent raw materials (cement, one or more supplementary cementitious materials, viscosity-modifying admixtures, superplasticisers, and aggregates) with distinct natures and functions.