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Abstract: Investigation on the mechanical properties of cement-based materials at micron and sub-micron scales is important for understanding its overall performance. Recent progress in experimental nanomechanics opens new access to nano-engineering of cement-based composites. In this study, nanoindentation and viscoelastic modulus mapping were employed to study the interfacial properties. The interface width measured by modulus mapping was around 250 nm as compared to a rough estimation of less than 5 μm by nanoindentation, due to the fact that 2 orders of magnitude increase in spatial resolution could be achieved by modulus mapping. Both the nanoindetation and modulus mapping results indicated that the modulus of the interface falls between 60–70 GPa. The packing density in the interface was non-uniform as two peaks of value were observed for the storage modulus distribution. This interface could be regarded as a dense hydration coating around cement grains, which was less permeable and hindered the further hydration of cement.

纳米压痕及动态模量图研究C-S-H凝胶/水泥颗粒界面的纳米力学性能

[1]Acker, P., 2001. Micromechanical analysis of creep and shrinkage mechanisms. Creep, Shrinkage and Durability Mechanics of Concrete and Other Quasi-brittle Materials, Elservier, London, UK.

[2]Balooch, G., Marshall, G.W., Marshall, S.J., et al., 2004. Evaluation of a new modulus mapping technique to investigate microstructural features of human teeth. Journal of Biomechanics, 37(8):1223-1232.

[3]Constantinides, G., Ulm, F.J., 2004. The effect of two types of C-S-H on the elasticity of cement-based materials: results from nanoindentation and micromechanical modeling. Cement and Concrete Research, 34(1):67-80.

[4]Constantinides, G., Ulm, F.J., 2007. The nanogranular nature of C-S-H. Journal of the Mechanics and Physics of Solids, 55(1):64-90.

[5]Constantinides, G., Ulm, F.J., van Vliet, K., 2003. On the use of nanoindentation for cementitious materials. Materials and Structures, 36(3):191-196.

[6]Constantinides, G., Chandran, K.S.R., Ulm, F.J., et al., 2006. Grid indentation analysis of composite microstructure and mechanics: principles and validation. Materials Science and Engineering: A, 430(1-2):189-202.

[7]Davydov, D., Jirásek, M., Kopecký, L., 2011. Critical aspects of nano-indentation technique in application to hardened cement paste. Cement and Concrete Research, 41(1):20-29.

[8]DeJong, M.J., Ulm, F.J., 2007. The nanogranular behavior of C-S-H at elevated temperatures (up to 700 °C). Cement and Concrete Research, 37(1):1-12.

[9]Jennings, H.M., Thomas, J.J., Gevrenov, J.S., et al., 2007. A multi-technique investigation of the nanoporosity of cement paste. Cement and Concrete Research, 37(3):329-336.

[10]Jones, C.A., Grasley, Z.C., Ohlhausen, J.A., 2012. Measurement of elastic properties of calcium silicate hydrate with atomic force microscopy. Cement and Concrete Composites, 34(4):468-477.

[11]Kawashima, S., Hou, P., Corr, D.J., et al., 2013. Modification of cement-based materials with nanoparticles. Cement and Concrete Composites, 36:8-15.

[12]Miller, M., Bobko, C., Vandamme, M., et al., 2008. Surface roughness criteria for cement paste nanoindentation. Cement and Concrete Research, 38(4):467-476.

[13]Mondal, P., Shah, S.P., Marks, L.D., 2007. A reliable technique to determine the local mechanical properties at the nanoscale for cementitious materials. Cement and Concrete Research, 37(10):1440-1444.

[14]Mondal, P., Shah, S.P., Marks, L.D., 2008. Nanoscale characterization of cementitious materials. Materials Journal, 105(2):174-179.

[15]Oliver, W.C., Pharr, G.M., 1992. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. Journal of Materials Research, 7(6):1564-1583.

[16]Oliver, W.C., Pharr, G.M., 2004. Measurement of hardness and elastic modulus by instrument indentation: advances in understanding and refinements to methodology. Journal of Materials Research, 19(1):3-20.

[17]Sorelli, L., Constantinides, G., Ulm, F.J., et al., 2008. The nano-mechanical signature of ultra high performance concrete by statistical nanoindentation techniques. Cement and Concrete Research, 38(12):1447-1456.

[18]Uskokovic, P.S., Tang, C.Y., Tsui, C.P., et al., 2007. Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping. Journal of the European Ceramic Society, 27(2-3):1559-1564.

[19]Vandamme, M., Ulm, F.J., Fonollosa, P., 2010. Nanogranular packing of C-S-H at substochiometric conditions. Cement and Concrete Research, 40(1):14-26.

[20]Velez, K., Maximilien, S., Damidot, D., et al., 2001. Determination by nanoindentation of elastic modulus and hardness of pure constituents of Portland cement clinker. Cement and Concrete Research, 31(4):555-561.

[21]Xiao, J.Z., Li, W.G., Sun, Z.H., et al., 2013. Properties of interfacial transition zones in recycled aggregate concrete tested by nanoindentation. Cement and Concrete Composites, 37:276-292.

[22]Xu, J., Yao, W., 2011. Nano-scratch as a new tool for assessing the nano-tribological behavior of cement composite. Materials and Structures, 44(9):1703-1711.