ABS Disposable Formworks create bidirectional hollow reinforced concrete slabs, also called voided slabs, by forming air gaps in the slab that are fully covered with concrete. Disposable formworks are concrete shaping elements made of recycled PP and they are only used once. The system reduces total structural weight up to 25%, saving on concrete and steel. Reducing structural weight leads to reduced foundation loads in addition to increased earthquake performance. Architecturally, wider column spans can be achieved while reducing slab thickness and constructing a continuous ceiling without drop beams; thus mechanical, electrical and plumbing installations can be mounted linearly without any structural hindrance.