Impact dynamic properties of magnesium oxychloride-doped paper sludge composites

Abstract

To address the heavy pollution caused by paper sludge, this  study investigates a novel approach by incorporating paper sludge  into magnesium oxychloride cement to develop a new type of  concrete composite material. To achieve waste utilisation, cost  savings and pollution reduction, the impact dynamics properties  of the concrete specimens were conducted using an electromagnetically driven Hopkinson pressure bar, while a high-speed camera recorded the specimen destruction process, stress-strain curve,  destruction morphology, deformation field, and evolution of energy consumption. Results show that as the paper sludge doping  increases, the peak stress of the stress-strain curve and the energy consumption gradually increase. Increasing the voltage leads to a  gradual rise in peak stress and energy consumption of the specimen. During the impact test, the transverse fissures are gradually developed in the test block, and as the impact stress increases,  the fissures are widened until the specimen eventually being fractured. Moreover, the higher impact voltage and paper sludge content result in the increased specimen displacement and strain. It  is expected that nearly 50% of paper sludge will be recycled every  year by this method, which will save 10%-20% of raw materials.  The conclusions obtained in this study provide a reference for the  engineering application of the paper sludge concrete composites.