An investigation is reported on non-traditional 3D reinforcement for composite materials with brittle matrix. Concrete was used as a material for the matrix. Three different compressive strength concrete matrix composites were investigated. 3D reinforcement was created using weft knitted E-glass fiber nets. The production technology of thin glass-fiber concrete matrix shells reinforced by knitted glass-fiber textiles was observed, and 1,5-cm-thick shells reinforced with three knitted nets were elaborated. The shells were produced using pneumatic mould technology. In general, the main goal of the work was to investigate the possibility of creating glass-fiber knitted textiles and to use them in the concrete as reinforcement analyzing the main technological problems rising by the manufacturing of such materials, and to investigate the strength of the final product. Main technological steps are described: a) knitting of glass-fiber yarn net with knitting machine; b) placing of the textile reinforcement into the mould and filling it with concrete. Finally, experimentally prepared prisms containing different numbers of reinforcing nets were tested for 4-point bending. Fiber-concrete fracture (and post-cracking) behavior was investigated depending on the strength of concrete matrix and the number of nets in prisms. Investigations showed high dependence of bending strength results on the porosity of material. Complete penetration of concrete with glass-fiber yarns inside the textiles (decreasing voids and pores) is very important for the strength of fiber-concrete prisms and for post-cracking behavior. This problem is becoming more important for increasing the number of reinforcing fibers and yarns in the reinforcing structure. The amount of glass fibers used in the present experiments can be characterized as small. The experiments demonstrated the importance of investigating materials with larger amount of fibers for materials with a higher load-bearing capacity in post-cracking stage