Pore and phase identification through nanoindentation mapping and micro-computed tomography in nanoenhanced cement

Konstantopoulos, Georgios; Koumoulos, Elias P.; Karatza, Anna; Charitidis, Costas A.

doi:10.1016/j.cemconcomp.2020.103741

Cited by 24 publications

(2 citation statements)

References 47 publications

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“…However, the presence of sorption pores in C-S-H is a common feature for both cement putties and mortars. Consequently, changes in porosity are affected by the presence of CSH and carbon nanotubes that increase the density of the gel phases [61]. The hardness of the 0.020 % SWCNT added composite has reduced by 2 % compared to the reference.…”

Section: Hardness Test Resultsmentioning

confidence: 99%

Production and Characterization of GRC-SWCNT Composites for Shell Elements

Subaşı

Dehghanpour²,

Maraşlı³

2022

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Nano-sized defects in Glass fiber Reinforced Concrete (GRC) shell elements can cause damage over time, leading to mechanical and durability problems. Therefore, in this study an experimental program was conducted to investigate the application of single-walled carbon nanotube as a nano-additive material in GRC. Since there is no study on GRC-carbon nanotube (CNT) composites in the literature, the behavior of CNTs on conventional concretes was discussed. Five different GRC-SWCNT composite mixtures containing 0, 0.007, 0.010, 0.015 and 0.020 wt.% single walled carbon nanotube (SWCNT) were obtained. Calcined kaolin and acrylic polymer were used as pozzolanic and chemical modification materials in the mixtures, respectively. Workability, density, capillarity, pressure, flexural, tensile, impact, Leeb hardness and FE-SEM tests of the produced samples were carried out. According to the results obtained, the optimum SWCNT ratio in GRC mixtures was found to be 0.015 %. It was observed that there was a linear relationship between the mechanical results. FE-SEM images confirmed that SWCNTs act as bridges for micro-cracks and reinforce the microstructure.

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Section: Hardness Test Resultsmentioning

confidence: 99%

Production and Characterization of GRC-SWCNT Composites for Shell Elements

Subaşı

Dehghanpour²,

Maraşlı³

2022

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“…Microstructure analysis by SEM and MIP tests have indicated that MWCNTs with diameter of 10–20 nm demonstrate the best effect on optimizing pore structure [ 35 ]. A recent study combining nanoindentation with elemental mapping and X-ray scanning microtomography shows that higher density hydrated phases are forming at a CNTs concentration of 0.5 wt% [ 36 ]. In general, porosity increases with increasing diameter of MWCNTs.…”

Section: Nanomaterials Typically Used In Cement-based Materialsmentioning

confidence: 99%

Nanomaterials in Cementitious Composites: An Update

et al. 2021

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This review is an update about the addition of nanomaterials in cementitious composites in order to improve their performance. The most common used nanomaterials for cementitious materials are carbon nanotubes, nanocellulose, nanographene, graphene oxide, nanosilica and nanoTiO2. All these nanomaterials can improve the physical, mechanical, thermal and electrical properties of cementitious composites, for example increase their compressive and tensile strength, accelerate hydration, decrease porosity and enhance fire resistance. Cement based materials have a very complex nanostructure consisting of hydration products, crystals, unhydrated cement particles and nanoporosity where traditional reinforcement, which is at the macro and micro scale, is not effective. Nanomaterials can reinforce the nanoscale, which wasn’t possible heretofore, enhancing the performance of the cementitious matrix.

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Hydration, Compressive Strength and Durability of Eco-friendly Cement Mortars Containing Recycled Brick Powder and Metakaolin

Wang

Qian

et al. 2022

KSCE J Civ Eng

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Pore and phase identification through nanoindentation mapping and micro-computed tomography in nanoenhanced cement

Cited by 24 publications

References 47 publications

Production and Characterization of GRC-SWCNT Composites for Shell Elements

Production and Characterization of GRC-SWCNT Composites for Shell Elements

Nanomaterials in Cementitious Composites: An Update

Hydration, Compressive Strength and Durability of Eco-friendly Cement Mortars Containing Recycled Brick Powder and Metakaolin

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