INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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A Review on the Application of Nanoindentation in the Research of Cement-based Materials |
GE Haidong1, FENG Chunhua1, DONG Yijiao1, ZHAO Qian1, LI Dongxu2
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1 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2 College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China |
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Abstract As an important civil engineering material, cement-based material plays an important role in the national economic construction. At present, relevant researches on its mechanical properties mainly focus on the macroscopic mechanical properties such as compression and flexural resistance. In contrast, its micromechanical properties are relatively less studied. In view of the fact that the macroscopic mechanical properties of materials depended on the structural composition and mechanical properties at the microscopic level, it is one of the hotspots of current research to explore the performance mechanism of cement-based materials from the microscopic level. With the development of mechanical testing method of materials, nanoindentation technique has become the most advanced testing method for quantitatively characterizing the micro-mechanical properties of cement-based materials. On the other hand,the cement-based material is a heterogeneous material, and its hydration product contains a plurality of components. People are often subject to empirical constraints in phase division and quantitative analysis. Therefore, the performance of cement-based materials is far from to meet people’s demand. But the test data can be deconvoluted using the principle of maximum likelihood or least squares, thereby realizes the quantification of the compositions and dramatically improves the precision of the analysis. Nanoindentation technique can not only test the elastic modulus and hardness of the cement clinker (tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), etc.), but also test the micromechanical properties for the hydration product (hydrated calcium silicate gel (C-S-H), calcium hydroxide (CH), etc.) of cement-based materials and pores. By changing the loading system, especially the residence time of the load, the micro creep modulus can be measured in a short time and the macroscopic creep properties of the cement-based material can be quantitatively predicted. When combined with other microscopic testing methods (SEM, EDS, etc.), the latest chemo-mechanical technique can disclose the micro-mechanical properties of intimately intermixed phases and enable to distinguish chemical phases having strongly overlapping mechanical properties. So the phase can be accurately divided. By means of the change of the microstructure of the transition zone of the observation interface, it can provide certain theoretical supplement and technical support for the strength theory of the interface transition zone. This paper mainly introduces the basic principle of nanoindentation technique, sample preparation, and studies the phase-separation and micro-mechanical properties, creep properties and interface transition zone of cement-based materials from nanoindentation. Research status and rela-ted results are illustrated, and the problems existing on the current researches are analyzed, and the development trend in the research is prospected,in an effort to provide a reference to the extensive and in-depth study of the micro-performances of the cement-based material.
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Published: 10 April 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51502080,51872137). |
About author:: Haidong Gereceived his B.E. degree in the environmental protection equipment engineering from Taiyuan University of Science and Technology in 2018. He is currently pursuing his M.S. at the School of Materials Science and Engineering, Henan Polytechnic University under the supervision of lecturer Chunhua Feng. His research has focused on solid waste treatment and green building materials.Chunhua Fengreceived her Ph.D. degree in materials from Nanjing University of Technology in 2012. She is currently a lecturer in Henan Polytechnic University. Her research interests are cement hydration mechanism research and solid waste utilization. |
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