Concrete as one of the most widely used materials has a significant impact on the emission of CO₂ and resource consumption. To reduce these negative aspects, concrete structures need to become more efficient and lightweight. Textile-reinforced concrete (TRC) as a novel material promotes new possibilities in the design of filigree load-bearing structures. In turn, such a shift demands new methods in the manufacturing of concrete elements to ensure an appropriate level of quality compared to common methods. As one possibility it was proposed to rethink a vacuum-assisted die-casting method, which is widely used in other industries such as automotive, for the production of thin-walled TRC components. In this regard, the question arose, if the specific manufacturing conditions result in different material properties of the high-performance concrete matrix. Thus, current research focused on detecting differences and similarities in the material properties of concrete and TRC samples cast under standard conditions and under reduced air pressure conditions or how it is referenced further in the text negative air pressure condition (APC). On the meso scale, no noteworthy differences were determined. To dive deeper into understanding how the altered environmental conditions impact the high-performance concrete matrix, a series of experiments were conducted to scrutinize the microstructure of samples that were extracted from large-scale shell elements cast under different grades of air pressure using a computed tomography (CT) and X-ray diffraction (XRD) method. The results are presented in the paper.