？ ULM F J, CONSTANTINIDES G, HEUKAMP F H. Is concrete a poromechanics material?—A multiscale investigation of poroelastic properties [J]. Mater Struct, 2004, 37(265): 43–58.
[3]
？ STORA E, HE Q C, BARY B. Influence of inclusion shapes on the effective linear elastic properties of hardened cement pastes [J]. Cem Concr Res, 2006, 36(7): 1330–1344.
[4]
？ SORELLI L, CONSTANTINIDES G, ULM F J, et al. The nano-me- chanical signature of ultra high performance concrete by statistical nanoindentation techniques [J]. Cem Concr Res, 2008, 38(12): 1447– 1456.
[5]
？ SORRENTINO F, VELEZ K, MAXIMILIEN S, et al. Determination by nanoindentation of elastic modulus and hardness of pure constituents of Portland cement clinker [J]. Cem Concr Res, 2001, 31(4): 555–561.
[6]
？ ACKER P. Swelling, shrinkage and creep: a mechanical approach to cement hydration [J]. Mater Struct, 2004, 37(268): 237–243.
[7]
？ CONSTANTINIDES G, ULM F, van VLIET K. On the use of nanoindentation for cementitious materials [J]. Mater Struct, 2003, 36(257): 191–196.
[8]
？ LURA P, TRTIK P, MUNCH B. A critical examination of statistical nanoindentation on model materials and hardened cement pastes based on virtual experiments [J]. Cem Concr Comp, 2009, 31(10): 705–714.
[9]
？ OLIVER W C, PHARR G M. Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology [J]. J Mater Res, 2004, 19(1): 3–20.
[10]
？ FISHER-CRIPPS A C. Nanoindetation [M]. 3rd ed. London: Springer, 2011: 21–92.
[11]
？ ULM F J, VANDAMME M, BOBKO C, et al. Statistical indentation techniques for hydrated nanocomposites: Concrete, bone, and shale [J]. J Am Ceram Soc, 2007, 90(9): 2677–2692.
[12]
？ DAVYDOV D, JIRASEK M, KOPECKY L. Critical aspects of nano-indentation technique in application to hardened cement paste [J]. Cem Concr Res, 2011, 41(1): 20–29.
[13]
？ DORN R I. Digital processing of back-scatter electron imagery: A microscopic approach to quantifying chemical weathering [J]. Geol Soc Am Bull, 1995, 107(1): 725–741.
[14]
？ CHEN J J, SORELLI L, VANDAMME M, et al. A Coupled nanoindentation/SEM-EDS study on low water/cement ratio portland cement paste: Evidence for C–S–H/Ca(OH)(2) nanocomposites [J]. J Am Ceram Soc, 2010, 93(5): 1484–1493.
[15]
？ MONDAL P, SHAH S R, MARKS L D. Nanoscale characterization of cementitious materials [J]. Aci Mater J, 2008, 105(2): 174–179.
[16]
？ SKALNY J G J, ODLER I. Calcium Hydroxide in Concrete [M]. Westerville: The American Ceramic Socity, 2001: 77–89.
[17]
？ RICHARDSON I. The nature of CSH in hardened cements [J]. Cem Concr Res, 1999, 29(8): 1131–1147.
[18]
？ SCRIVENER K L, CRUMBIE A K, LAUGESEN P. The interfacial transition zone (ITZ) between cement paste and aggregate in concrete [J]. Interf Sci, 2004, 12(4): 411–421.
[19]
？ ZHU W, FONTEYN M T J, HUGHES J, et al. Nanoindentation study of resin impregnated sandstone and early-age cement paste specimens [C]// 3rd International Symposium on Nanotechnology in Construction, Prague Czech Republic, 2009: 403– 408.
[20]
？ OLIVER W C, PHARR G M. An improved technique for determining hardness and elastic-modulus using load and displacement sensing indentation experiments [J]. J Mater Res, 1992, 7(6): 1564–1583.
[21]
？ JENNINGS H M. A model for the microstructure of calcium silicate hydrate in cement paste [J]. Cem Concr Res, 2000, 30(1): 101–116.
[22]
？ JENNINGS H M, THOMAS J J, GEVRENOV J S, et al. A multi- technique investigation of the nanoporosity of cement paste [J]. Cem Concr Res, 2007, 37(3): 329–336.
[23]
？ ULM F J, VANDAMME M, JENNINGS H M, et al. Does microstructure matter for statistical nanoindentation techniques? [J]. Cem Concr Comp, 2010, 32(1): 92–99.
[24]
？ LURA P, TRTIK P, MUNCH B. Validity of recent approaches for statistical nanoindentation of cement pastes [J]. Cem Concr Comp, 2011, 33(4): 457–465.
[25]
？ ULM F J, CONSTANTINIDES G. The effect of two types of C–S–H on the elasticity of cement-based materials: Results from nanoindentation and micromechanical modeling [J]. Cem Concr Res, 2004, 34(1): 67–80.
[26]
？ ULM F J, CONSTANTINIDES G. The nanogranular nature of C–S–H [J]. J Mech Phys Solids, 2007, 55(1): 64–90.
[27]
？ ULM F J, DEJONG M J. The nanogranular behavior of C–S–H at elevated temperatures [J]. Cem Concr Res, 2007, 37(1): 1–12.
[28]
？ MONDAL P, SHAH S P, MARKS L. A reliable technique to determine the local mechanical properties at the nanoscale for cementitious materials [J]. Cem Concr Res, 2007, 37(10): 1440–1444.
[29]
？ MONDAL P, SHAH S P, MARKS L D. Nanomechanical properties of interfacial transition zone in concrete [C]// 3rd International Symposium on Nanotechnology in Construction, Prague Czech Republic, 2009: 315–320.
[30]
？ SIDNEY D. The microstructure of cement paste and concrete––a visual primer [J]. Cem Concr Comp, 2004, 26(8): 919–933.
