Study on the Mechanical Properties of MiC Formworks with Different Material Components

Abstract

Modular integrated construction (MiC) is a new type of assembled building structure system that consists of prefabricated concrete modules connected using post-cast concrete. To reduce material consumption and realize casting without supporting molds, thin and lightweight concrete formworks (MiC formworks) with a thickness of 30 mm are installed as part of the shear wall. Due to the thinness, concrete pouring tends to cause MiC formwork cracking, mold rising, and other problems. Its stress performance and damage mechanism are not clear. For this reason, three groups of MiC formworks with different material composition types are designed. The static load test is carried out in a graded partition loading mode, and parametric analysis is combined with numerical simulation to systematically study the influence of different material components on the mechanical properties of MiC formworks. The results show that the front cracks of the MiC formworks are mainly distributed under the truss tendons, and the back cracks are mainly distributed in the span position of the adjacent truss tendons. These cracks both occur along the span direction of the MiC formworks. Increasing the concrete strength has a significant effect on improving the load-bearing capacity of MiC formworks, while incorporating steel fibers can significantly improve its deformation and crack resistance. Parametric analysis showed that the steel fiber admixture exhibited limited improvements in the cracking resistance of the panels as the concrete matrix grade increased. The research results provide a practical basis for optimizing the production process of MiC formworks.

On the methodology of conventional and semi-system formwork project comparison

“…Essentially, it is not possible to separate existing obstacles from the potential to create delays in a project that is already in progress. Not completing a project within the designated timeframe can result in wasted time when implementing its outcomes, leading to delays or postponements in the application of the project's development results [ 7 , 8 ]. Conversely, a project's long-term viability will be enhanced by thorough planning, while it will be negatively impacted by insufficient planning [ 9 ].…”