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NEWS & MARKET20 NEWS & MARKET AAC WORLDWIDE %u2022 2.2025Promising approach for a trend reversal %u2013 part 2In modern construction, the demand for efficient, sustainable, and cost-effective building materials is driving innovation in technology and design. One such solution is the use of modular Autoclaved Aerated Concrete (AAC) panels, which offer significant advantages over traditional construction methods.This second part of the article explores the benefits of modular AAC panels, focusing on their impact on construction time, labor intensity, sustainability, market potential and the impact of including BIM technology. By comparing AAC panels with conventional materials such as calcium silicate blocks and ceramic bricks, the discussion highlights how these panels reduce construction time by up to 80%, decrease labor intensity, and enable faster assembly with minimal training requirements. Additionally, the article examines their role in addressing worker shortages through mechanization and prefabrication, as well as their environmental advantages, including a low carbon footprint and efficient use of raw materials.With increasing emphasis on sustainability and cost efficiency in the construction industry, modular AAC panels present a promising solution for both small-scale residential and non-residential projects.Construction time and labor intensity of installationThe construction time and labor intensity were compared for the most popular technologies using the example of a two-story house with a usable area of 135 m%u00b2, using catalogs of labor, materials and equipment expenditures KNR (Table 4). For modular elements, empirically estimated data were used. Based on experiences from existing projects, it can be assumed that in single day, two installers can assembly approximately 150 m%u00b2 of structural walls from modular AAC panels during one work shift (10 hours). For partition walls, one experienced installer typically achieves an efficiency of about 40 m%u00b2 wall surface during one work shift (10 hours).The workload for erecting structural external walls, structural internal walls and partition walls compared to calcium silicate blocks and ceramic hollow bricks is more than five times lower. Walls from AAC are erected faster, but the use of modular elements further reduces labor intensity by almost three times. The difference increases when utilizing the thermal properties of autoclaved aerated concrete and constructing monolithic walls. In extreme cases, erecting walls and finishing the facade with modular AAC panels can shorten the construction time by over 600 man-hours, or nearly 80%. This is a significant difference even for a single-family house project. Considering that the system is currently most commonly used in developer projects where several to a dozen buildings are erected, it can also translate into significant differences in fixed costs associated with maintaining the construction site.Buildings can be erected faster using typically prefabricated partitions. The advantages of such a solution include the possibility of delivering walls together with installations. The assembly time can be reduced to 0.5 days for a single-story building, which is not a significant difference considering the need to manufacture elements on special order. Flexibility in ordering is crucial for the realization time. The assumption of modular AAC panel systems is the availability of typical solutions from stock. This flexibility is important for design changes and mistakes on construction, which occur more frequently in this segment of applications than in other buildings.Prospects for the development of modular panels made of AAC in PolandM.Eng. Wojciech Rogala, Politechnika Warszawska, PolandM.Sc. Robert Turski and M.Eng. Pawe%u0142 G%u00f3rski, Xella Polska, Poland