▎ 摘　　要

The effects of Graphene oxide (GO) on properties and microstructure of cement-waste concrete powder (WCP) composite were investigated experimentally in detail, a nonmetallic ultrasound detection for compactness, X-ray diffraction (XRD) detection for mineral composition and scanning electron microscope (SEM) detection for structure and morphology were put in use. The experiment results represented that the mortar could be compacted and the mechanical strength could be improved under an action of GO accompanying with the decrease of slump value. Compared to the compressive strengths, the flexural strengths of mortar and cement-WCP composite were improved furtherly by GO. However, the properties of mortar could be deteriorated when the WCP replacement of cement more than 20%. It was confirmed that the strengths of mortar with 20% WCP replacement of cement and 0.05% GO addition could exceed the values of standard. Ultrasonic wave, SEM and XRD detections proved that GO could strengthen the composite structure and form a more compact composite. (C) 2021 Elsevier Ltd. All rights reserved.