Graphene oxide/carbon nanotubes harmonize to enhance the initial hydration products and mechanical properties of cement mortar

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-02 DOI:10.1016/j.conbuildmat.2025.141056

Lei Fan , Jinhao Zheng , Hongwei Wang , Feng Li , Fangyuan Song , Chengtao Wu , Qingxing Feng , Hui Jin , Jianzhong Xia

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引用次数: 0

Abstract

In order to improve the initial performance of cement-MWCNTs mortar, mortar samples with different amounts of graphene oxide (GO) and MWCNTs were prepared for compressive and flexural tests and their mechanism are subjected to X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM) and infrared spectroscopy (Ft-IR). The results show that the incorporation of GO can improve the fluidity and flexural strength of cement-MWCNTs mortar. Among them, the mixing effect of M125-G050 is the most significant, with flexural strength reaching 8.11 MPa and 10.13 MPa at 3d and 28d and compressive strength reaching 42.61 MPa and 61.81 MPa, respectively, which are 40.79 % and 34.70% (for flexural strength), and 71.53% and 103.38 % (for compressive strength) higher than those of the benchmark group (M125-G0). In addition, the synergistic effect of GO and MWCNTs can continuously promote the hydration of cement clinker, generate more C-S-H (content increased by 0.5118 %), refine the pore structure of cement-MWCNTs mortar, improve compactness and exhibit a significant positive mixing effect. By using the molecular dynamics method and fracture mechanics theory, it is also confirmed that the GO layers strengthened the interlayer interaction between CNTs and CSH matrix, and provided a positive effect in interlayer mechanical properties.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.