Microstructure-Based Prediction of the Elastic Behaviour of Hydrating Cement Pastes

Mazaheripour, Hadi; Faria, Rui; Ye, Guang; Schlangen, Erik; Granja, José Luís Duarte; Azenha, Miguel

doi:10.3390/app8030442

Cited by 16 publications

(9 citation statements)

References 31 publications

(46 reference statements)

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“…For the MCP, ν d is close to 0.285 for 30, 72, and 168 h. Lower (0.276) and higher (0.307) values were measured at 36 and 48 h, respectively. Values of ν d below 0.30 are expected for the hydrated cement paste (HCP) since Poisson’s ratio of cement clinker minerals is 0.3 [ 62 ] and that of C-S-H outer and inner gel and of Ca(OH) 2 is 0.25, 0.25, and 0.30, respectively [ 63 ]. The effect of formed cracks on the V P and V S values directly influenced calculated ν d at these two ages.…”

Section: Resultsmentioning

confidence: 99%

The Relation between Concrete, Mortar and Paste Scale Early Age Properties

Klun¹,

Bosiljkov²,

Bokan-Bosiljkov³

2021

Materials

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Microstructure development of concrete, mortar, and paste scale of cement-based material (CBM) during the early hydration stage has a significant impact on CBM’s physical, mechanical, and durability characteristics at the high maturity state. The research was carried out using compositions with increased autogenous shrinkage and extended early age period, proposed within the RRT+ programme of the COST Action TU1404. The electrical conductivity method, used to follow the solidification process of CBM, is capable of determining the initial and final setting time, and the end of the solidification process acceleration stage for the paste and mortar scale. Simultaneous ultrasonic P- and S-wave transmission measurements revealed that the ratio of velocities VP/VS is highly dependent on the presence of aggregates—it is considerably higher for the paste scale compared to the mortar and concrete scale. The deviation from the otherwise roughly constant ratio VP/VS for each scale may indicate cracks in the material. The non-linear correlation between the dynamic and static elastic moduli valid over the three scales was confirmed. Additionally, it was found that the static E-modulus correlates very well with the square of the VS and that the VS is highly correlated to the cube compressive strength—but a separate trendline exists for each CBM scale.

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Section: Resultsmentioning

confidence: 99%

The Relation between Concrete, Mortar and Paste Scale Early Age Properties

Klun¹,

Bosiljkov²,

Bokan-Bosiljkov³

2021

Materials

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“…The possibility of reproducing the evolution of cement paste mechanical properties obtained through EMM-ARM by means of numerical simulations of paste microstructure was studied in [27]. In particular, three-dimensional lattices and Finite Element models were applied, obtaining promising results.…”

Section: Emm-arm In the Literaturementioning

confidence: 99%

Experimental Study about the Influence of Storage Conditions of Bulk Cement on the Early-Age Stiffness Evolution of Cementitious Pastes

Cieri,

Cassese,

Fabbrocino

et al. 2023

Applied Sciences

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The effects of uncontrolled storage and curing temperature on the early-age mechanical behavior of cement are under-investigated issues, and the few available studies in the literature analyze their influence mainly from a chemical-physical point of view. The present study, on the contrary, aims at studying the effects of temperature and, above all, cement prehydration due to uncontrolled storage from a phenomenological perspective through the application of the EMM-ARM method. In particular, the influence of those factors on the early-age evolution of the Young’s modulus of cement pastes produced from Portland as well as pozzolanic cement is experimentally assessed. The obtained results confirm the possibility of exploiting the EMM-ARM method to characterize those effects on a phenomenological basis, sorting back to the comparison of the curves of prehydrated cement with reference ones in controlled storage conditions. As a result, the methodology shows promising applicative perspectives for acceptance checks of the materials before use.

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“…The Young's modulus of hardened cement paste, with 0.5 water/cement ratio, obtained from nanoindentation tests was reported to range from 4.5 GPa to 4.8 GPa after 3 day curing and 6.5 GPa to 7.5 GPa after 7 day curing [25,26]. Young's modulus used for this study was predicted based on the water/cement ratio and cure days based on the model developed in [28]. Densely packed MWCNTs inclusions with low quantities of resin and solvent are developed.…”

Section: Sensor Designmentioning

confidence: 99%

Cement sensors with acoustic bandgaps using carbon nanotubes

Vemuganti¹,

Stormont²,

Pyrak‐Nolte³

et al. 2021

Smart Mater. Struct.

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Cement is widely used in wellbores to stabilize the steel casing used in wellbore operations for oil and gas production, enhanced geothermal systems and carbon sequestration, and to limit fluid movement between sub-surface strata. Flaws such as microcracks in wellbore cement can lead to leakage along the wellbore compromising wellbore integrity. There is an increasing need for methods to monitor cement crack propagation in wellbore environments. In this study, we develop and report the first cementitious sensors capable of exhibiting high frequency acoustic bandgaps (ABGs) using carbon nanotubes (CNTs). Computational simulations of a sensor unit cell are used to design cement-multi walled carbon nanotubes (MWCNTs) sensors that show a wide bandgap. When the cement-MWCNTs sensors is embedded in cement specimens, bandgaps were measured experimentally under 300 kHz and under 600 kHz, consistent with the computationally predicted bandgaps in the range of 290–360 kHz, 410–460 kHz and 515–585 kHz. These bandgap features were absent in homogeneous cement specimens. X-ray tomographic reconstructions showed microscopic debonding at cement-MWCNTs sensor interface. Frequency response analysis of a three-dimensional computational model indicated a shift of frequency of minimum transmission due to the interface debonding, but no perturbation of bandgap response was observed. The cement-MWCNTs sensors developed in this study show the potential of a packed CNT inclusion material in cementitious matrix to create ABGs in a cement matrix.

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Microstructure-Based Prediction of the Elastic Behaviour of Hydrating Cement Pastes

Cited by 16 publications

References 31 publications

The Relation between Concrete, Mortar and Paste Scale Early Age Properties

The Relation between Concrete, Mortar and Paste Scale Early Age Properties

Experimental Study about the Influence of Storage Conditions of Bulk Cement on the Early-Age Stiffness Evolution of Cementitious Pastes

Cement sensors with acoustic bandgaps using carbon nanotubes

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