Nanoindentation mapping of mechanical properties of cement paste and natural rocks

Zhu, Wenzhong; Hughes, John Jay; Bícanić, Nenad; Pearce, CJ

doi:10.1016/j.matchar.2007.05.018

Cited by 229 publications

(125 citation statements)

References 12 publications

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“…Because the mechanical properties of the LD CSH and HD CSH are intrinsic to cement paste (Constantinides and Ulm 2004;Constantinides et al 2003;Zhu et al 2007), the most plausible reason for the lower modulus value of LD CSH for specimen OPC is related to a more porous microstructure of the cement matrix. As afore-mentioned in the "Introduction" section, the PEO-containing polymers influence the properties of fresh cement paste: they can hinder the coagulation and sedimentation of un-hydrated cement particles by increasing the electrostatic and/or steric repulsive forces (Jansen et al 2012;Mollah et al 2000).…”

Section: Distribution Of Hydration Products In the Presence Of Vesiclesmentioning

confidence: 99%

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Koleva

et al. 2013

ACT

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The influence of limited concentration, of 0.025 wt.% per cement weight, poly (ethylene oxide) -block -polystyrene vesicles on the hydration process, microstructure and micromechanical properties of cement paste at early hydration age of maximum 7 days are discussed. Isothermal calorimetry and non-evaporable water content tests indicate that the admixed vesicles have no apparent influence on the process of cement hydration, but affect microstructural properties. Whereas nitrogen adsorption tests reveal that the gel pore structure of the vesicles-modified matrix is almost identical to the vesicles-free one, mercury intrusion porosimetry proves refined capillary porosity and reduced total porosity in the presence of admixed vesicles. Nano-indentation supports the above observations and indicates that the admixed vesicles act as nucleation sites, leading to a more uniform distribution of low density hydration products.

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Section: Distribution Of Hydration Products In the Presence Of Vesiclesmentioning

confidence: 99%

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Koleva

et al. 2013

ACT

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“…The methodology and operating principle for the nanoindentation technique have been reviewed and presented in detail elsewhere [5][6][7][8]. Briefly, the test consists of making contact between a sample surface and a diamond indenter of known geometry, followed by a loading-unloading cycle while continuously recording the load, P, and indentation depth, h. The P-h curve obtained is a finger print of the mechanical properties of the test area.…”

Section: Testing Detailsmentioning

confidence: 99%

“…Elastic modulus and Hardness) in many different materials, including composites or multiphase materials [5][6][7][8]. In this study, geopolymers with the same starting materials and composition were made using two different processes, i.e.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation Study of Na-Geopolymers Exposed to High Temperatures

Beleña

Zhu

2009

Nanotechnology in Construction 3

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Abstract. This paper reports the usefulness of nanoindentation as a characterization and monitoring tool for studying thermal behaviour of Geopolymer materials. The influence of the manufacturing process of Na-Geopolymers in their micromechanical properties and thermal behaviour has been studied. Two types of metakaolin-based geopolymer panels with almost identical composition were prepared by injection and pouring methods. Micro-mechanical properties of the two samples exposed to high temperatures up to 1000 ºC were studied by nanoindentation technique, supplemented by X-ray diffraction (XRD), Nuclear magnetic resonance (NMR), Thermogravimetric analysis (TGA) and Microscopy. Remarkable differences in micro-mechanical properties and thermal behaviour between the two samples were found. Statistical nanoindentation has been successfully used to provide information about the micro-mechanical properties of different phases in the material and their volume distributions.

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“…Liu et al [6] presented an imaging method to assess the homogeneity of asphalt concrete using X-ray computed tomography whereas Steppe et al [7] applied computed microtomography for non-invasive determination of wood anatomical characteristics. On the other hand, nanoindentation technique has been commonly used to assess mechanical properties of concrete, cement paste or rocks [8]- [10]. It was also applied for measuring properties of biomaterials and tissues [11] and polymer nanocomposites in order to evaluate the surface mechanical properties down to the nanoscale level [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization by Means of X-ray Micro-CT and Nanoindentation Measurements

Rajczakowska

Stefaniuk

Łydżba

2015

Studia Geotechnica Et Mechanica

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Abstract:The aim of this paper is to present an example of the material microstructure characterization with the use of X-ray micro-CT and nanoindentation measurements. Firstly, the current scope of application of the aforementioned techniques is provided within different fields of science. Then, background of each of the methods is presented. The methodology of X-ray micro-CT is described with the emphasis on the Beer's law formulation. In addition, the basics of the nanoindentation technique are outlined and major formulas for the hardness and Young's modulus calculation are given. Finally, example results for a concrete sample are presented. The microstructure of the selected material is firstly characterized in terms of geometry using the results from the microtomograhy measurements, e.g., porosity and attenuation profiles, pore and aggregate size distribution, shape factor of pores, etc. Next, the results of the nanoindentation tests are provided, namely the hardness and Young's modulus versus the height of the sample. The influence of the number of tests and statistical analysis on the final results is underlined.

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Nanoindentation mapping of mechanical properties of cement paste and natural rocks

Cited by 229 publications

References 12 publications

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Nanoindentation Study of Na-Geopolymers Exposed to High Temperatures

Microstructure Characterization by Means of X-ray Micro-CT and Nanoindentation Measurements

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