A review on the mechanical properties of cement-based materials measured by nanoindentation

Hu, Chuanlin; Li, Zongjin

doi:10.1016/j.conbuildmat.2015.05.008

Cited by 241 publications

(66 citation statements)

References 93 publications

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“…4, the elastic modulus and hardness of different phases were obtained according to widely used calculation formulas [39][40][41][42][43]. Then probability density function (PDF) deconvolution technique [44,45] was adopted for the statistical grid data to obtain the respective indentation modulus of phases in the hydrated system.…”

Section: Experimental Methodsmentioning

confidence: 99%

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

Long

Luo

et al. 2020

J Infrastruct Preserv Resil

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In order to investigate the deterioration mechanism of steam-cured concrete under severe environmental actions such as acid rain corrosion, salt corrosion, and cyclic thermal loading, accelerated corrosion tests were conducted in this study. Surface damage as well as deteriorative kinetics of steam-cured concrete and cement paste suffering from coupled acid-thermal actions was investigated by soaking-drying cycle experiments. The effects of mineral admixture, curing regime and corrosion condition on the durability were all comparatively studied, and the X-ray diffractograms and nanoindentation were applied to analyse the mechanism of corrosion deterioration. The results revealed that compared with the cementitious materials under standard curing, larger depth and faster corrosion were observed for steam-cured concrete and cement paste, which might be partly attributed to the lower content of hydrated production presented in steam-cured specimens. Besides, under acid solution soaking-drying cycle regime, there was significant higher corrosion depth compared to only soaking in acid solution. The corrosion depth under steam curing and soaking-drying condition increased by 156.68% and 44.17%, respectively, compared with those under standard curing and only soaking treatment. In addition, fly ash effectively decreased the corrosion depth of steam-cured cement paste and concrete by 64.98% and 16.33%, respectively.

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Section: Experimental Methodsmentioning

confidence: 99%

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

Long

Luo

et al. 2020

J Infrastruct Preserv Resil

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“…Since that, we applied a most advanced equipment, the nano-indenter, to measure the Young's modulus of the samples, which are the main mechanical properties for the rock. Nanoindentation test is considered as a unique technique whereby a sharp indenter tip is used to touch the smooth surface of the sample with a certain mode, then the penetration depth will be recorded along with the applied load [20]. Figure 3a illustrates the typical curve of the indentation test.…”

Section: Mechanical Property Deformationmentioning

confidence: 99%

Investigation of Properties Alternation during Super-Critical CO2 Injection in Shale

et al. 2019

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The low recovery of oil from tight liquid-rich formations is still a major challenge for a tight reservoir. Thus, supercritical CO2 flooding was proposed as an immense potential recovery method for production improvement. While up to date, there have been few studies to account for the formation properties’ variation during the CO2 Enhanced Oil Recovery (EOR) process, especially investigation at the micro-scale. This work conducted a series of measurements to evaluate the rock mechanical change, mineral alteration and the pore structure properties’ variation through the supercritical CO2 (Sc-CO2) injection process. Corresponding to the time variation (0 days, 10 days, 20 days, 30 days and 40 days), the rock mechanical properties were analyzed properly through the nano-indentation test, and the mineralogical alterations were quantified through X-ray diffraction (XRD). In addition, pore structures of the samples were measured through the low-temperature N2 adsorption tests. The results showed that, after Sc-CO2 injection, Young’s modulus of the samples decreases. The nitrogen adsorption results demonstrated that, after the CO2 injection, the mesopore volume of the sample would change as well as the specific Brunauer–Emmett–Teller (BET) surface area which could be aroused from the chemical reactions between the CO2 and some authigenic minerals. XRD analysis results also indicated that mesopore were altered due to the chemical reaction between the injected Sc-CO2 and the minerals.

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“…Essentially, it is a process of driving an indenter into the material surface and investigating the mechanical behavior (hardness H, modulus E, creep compliance C, etc.) of the material based on the response of the indenter [15,16]. In 1992, Oliver and Pharr proposed a systematic analytical method of indentation hardness and elasticity modulus based on nanoindentation [17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior Investigation of 4H-SiC Single Crystal at the Micro–Nano Scale

Chai

et al. 2020

Micromachines

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In this paper, theoretical models of the critical indentation depth and critical force on brittle materials using cleavage strength and contact theory are proposed. A Berkovich indenter is adopted for nanoindentation tests on a 4H-SiC single crystal sample to evaluate its mechanical behaviors. The stages of brittle material deformation (elastic, plastic, and brittle) can be characterized by the load versus indentation depth curves through the nanoindentation test. The curve of the elastic deformation stage follows the Hertz contact theory, and plastic deformation occurs at an indentation depth of up to 10 nm. The mechanism of 4H-SiC single crystal cracking is discussed, and the critical indentation depth and critical force for the plastic-brittle transition are obtained through the occurrence of the pop-in point. This shows that the theoretical results have good coherence with the test results. Both the values of the elastic modulus and hardness decrease as the crack length increases. In order to obtain more accurate mechanical property values in the nanoindentation test for brittle materials such as SiC, GaN, and sapphire, an appropriate load that avoids surface cracks should be adopted.

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A review on the mechanical properties of cement-based materials measured by nanoindentation

Cited by 241 publications

References 93 publications

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

Deterioration mechanism of steam-cured concrete subjected to coupled environmental acid and drying action

Investigation of Properties Alternation during Super-Critical CO2 Injection in Shale

Mechanical Behavior Investigation of 4H-SiC Single Crystal at the Micro–Nano Scale

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