Issue 45

P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13 156 Graphene oxide on the microstructure and mechanical properties of cement based composite material Pang Jinchang, Wang Yeming College of Architecture and Civil Engineering, Nantong Institute of Technology, Nantong, Jiangsu, 226000, China pjcpangjc@163.com A BSTRACT . To investigate the mixing amount of graphene oxide and water cement ratio on the microstructure and mechanical properties of graphene oxide reinforced cement based composite material, graphene oxide suspension was developed using improved Hummers method, and the structure, size and morphology of graphene oxide were represented using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and AFM. The results demonstrated that the bending and compressive strength of graphene oxide reinforced cement based composite material improved firstly and then declined with the increase of the mixing amount of graphene oxide, and moreover the improvement of the bending strength was obvious than that of the compressive strength. When the content of graphene oxide was 0.03%, the bending strength reached the maximum, 13.73 MPa. Under a high water cement ratio, the addition of graphene oxide was more effective in enhancing the strength of cement mortar. The representation of the microstructure of cement based composite material with scanning electron microscope (SEM) suggested that graphene oxide could optimize the microstructure of cement hydration products, improve the pore structure of set cement, reduce the volume of micropore in set cement, and increase the compactness of set cement, i.e. apparently strengthen the toughening effect of set cement. The research achievements are useful to improve the mechanical properties of cement based composite materials. K EYWORDS . Graphene oxide; Cement based composite material; Mechanical properties. Citation: Jinchang, P., Yeming, W., Graphene oxide on the microstructure and mechanical properties of cement based composite material, Frattura ed Integrità Strutturale, 45 (2018) 156-163. Received: 25.03.2018 Accepted: 02.06.2018 Published: 01.07.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION oncrete is the most extensively applied cement based composite material [1, 2] which is composed of cement, dinas, rebars and reinforced fibers. Concrete has been extensively applied in the construction of buildings, roads, bridges and dams for its advantages of extensive source of raw materials, low cost, simple preparation techniques and high strength [3-6]. With the development of the construction field, concrete which was a traditional structural material with high bearing capacity has developed to be more functional and environmental-friendly. Currently, high performance concrete (HPC), an important development direction of concrete, is a cement based composite material with high strength, durability C