Plasterboard sheets are basically composed of gypsum plaster sandwiched between two layers of paper. The residues from their application in construction must be properly disposed, otherwise they can cause environmental impacts. The recycling of this type of waste is currently limited to incorporating small fractions of the gypsum plaster that integrates these sheets in the production of new sheets. Lining paper residues are not reused in the recycling process and are currently discarded. The objective of this research is to evaluate the recycling process of gypsum plasterboard waste on a bench scale, producing new sheets only with this waste. The plaster and lining paper from the drywall plasterboard waste were recycled separately to produce new recycled sheets. The experiment included crushing, calcination, rehydration, formation and breaking of specimens. The physical-chemical characteristics of the powder, the mechanical properties in the hardened state, as well as the microstructure and chemical composition of the recycled plaster were determined. Lining paper waste was recycled, determining its physical and mechanical characteristics. Recycled plasterboard sheets were produced and the physical and mechanical characteristics were determined. The grinding process used in the study proved to be efficient, because in addition to having a granulometry of 93.00% passing through the 290 μm sieve, the unit mass of the recycled plaster showed a value of 6.57 10⁵ kg m⁻³. The recycled plaster obtained 9.3 MPa in the axial compression strength, 3.25 MPa in the splitting tensile strength, values greater than 20 MPa for the surface hardness and 0.27 MPa in the adhesion resistance, taking into account all mechanical requirements of Brazilian standards. It was possible to manufacture sheets of recycled lining paper only with waste lining paper coverings. Plasterboard sheets were produced that were fully recycled with recycled gypsum plaster and recycled lining paper. The recycled gypsum plasterboard showed 11.20 kg m⁻² of surface mass density. 3.09 MPa and 2.62 MPa were obtained, respectively, in the longitudinal and transversal flexural strength tests. It reached 0.016 m in surface hardness determined by the maximum dent diameter. The axial compression strength of this recycled sheet was 14.37 MPa. The recycled gypsum plasterboard simultaneously met all the physical and mechanical requirements of Brazilian technical standards.

石膏板基本上由夹在两层纸之间的石膏灰泥组成。在施工中残留的残留物必须妥善处理，否则会造成环境影响。目前，这类废物的回收利用仅限于掺入少量石膏石膏，这些石膏将这些板料整合到新板料的生产中。衬纸残留在回收过程中不会再使用，目前已被丢弃。这项研究的目的是在工作台规模上评估石膏石膏板废料的回收过程，仅用这种废料生产新的板材。干墙石膏板废料中的石膏和衬纸分别进行回收，以生产新的回收纸。实验包括粉碎，煅烧，水化，形成和破坏标本。测定了粉末的物理化学特性，硬化状态下的机械性能以及回收灰泥的微观结构和化学组成。衬纸废料被回收，决定了其物理和机械特性。生产了再生石膏板，并确定了物理和机械特性。研究中使用的研磨工艺被证明是有效的，因为除了通过290μm筛的粒度为93.00％之外，再生石膏的单位质量还显示出6.57 10 ⁵  kg m ^-3的值。再生灰泥的轴向抗压强度为9.3 MPa，抗压强度为3.25 MPa。断裂拉伸强度，考虑到巴西标准的所有机械要求，其表面硬度的值大于20 MPa，粘合强度的值大于0.27 MPa。仅用废衬纸覆盖物就可以制造再生衬纸纸。生产的石膏板用再生石膏灰泥和再生衬纸完全回收。再生石膏纸面石膏板显示11.20 kg m ^-2表面质量密度。在纵向和横向弯曲强度测试中分别获得3.09 MPa和2.62 MPa。由最大凹痕直径确定的表面硬度达到0.016 m。该再生片的轴向压缩强度为14.37MPa。再生石膏灰泥板同时满足了巴西技术标准的所有物理和机械要求。