Cementitious Composites with High Compaction Potential: Modeling and Calibration

Vu, Giao; Iskhakov, Tagir; Timothy, Jithender J.; Schulte‐Schrepping, Christoph; Breitenbücher, Rolf; Meschke, Günther

doi:10.3390/ma13214989

Cited by 16 publications

(11 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Properties of lightweight concrete on porous aggregates depend on the state of contact zone between expanded the clay aggregate and cement matrix [ 17 , 54 , 55 , 56 , 57 ], and the density of the cement matrix [ 57 , 58 ].…”

Section: Resultsmentioning

confidence: 99%

Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

View full text Add to dashboard Cite

The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

show abstract

Section: Resultsmentioning

confidence: 99%

Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Note, that in this paper, the word 'coda wave' , 'wave', 'signal' and 'datapoint' refer to the same item and are used interchangeably. Hence, in order simulate damage processes, especially the pre-peak diffuse damage due 10 microcracking, it is essential that the heterogeneity of concrete at the mesoscale and the 32 Details of contact description can be found in [32].…”

Section: An Overview Of the Proposed Methodologymentioning

confidence: 99%

Numerical Simulation Based Damage Identification in Concrete

Vu¹,

Timothy²,

Singh³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

High costs for the repair of concrete structures can be prevented if damage at an early stage of degradation is detected and precautionary maintenance measures are applied. To this end, we use numerical wave propagation simulations to identify simulated damage in concrete using convolutional neural networks (CNN). Damage in concrete subjected to compression is modeled at the mesoscale using the discrete element method. Ultrasonic wave propagation simulation on the damaged concrete specimens are performed using the rotated staggered finite-difference grid method. The simulated ultrasonic signals are used to train a CNN based classifier capable of classifying three different damage stages (microcrack initiation, microcrack growth and microcrack coalescence leading to macrocracks). The performance of the classifier is improved by refining the dataset via an analysis of the averaged envelope of the signal. The classifier using the refined dataset has an overall accuracy of 90%.

show abstract

“…Concisely, the interaction of the DEM-particles under tension in normal direction is governed by a damage softening law and the tangential behavior of contact between the DEM-particles follows the modified Mohr-Coulomb frictional law. Details of contact description can be found in [17]. The calibrated parameters of mortar and aggregate materials are listed in Table 2.…”

Section: Numerical Modeling Of Damage In Concrete Subjected To Uniaxial Tensionmentioning

confidence: 99%

Sensitivity of Ultrasonic Coda Wave Interferometry to Material Damage - Observations from a Virtual Concrete Lab

Finger¹,

Saydak²,

Vu³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion of the ultrasonic wavefield, the coda, is sensitive to small changes in the elastic moduli of the material. Coda Wave Interferometry (CWI) correlates these small changes in the coda with the wavefield recorded in intact, or unperturbed, concrete specimen to reveal the amount of velocity change that occurred. CWI has the potential to detect localised damages and global velocity reductions alike. In this study, the sensitivity of CWI to different types of concrete mesostructures and their damage levels is investigated numerically. Realistic numerical concrete models of concrete specimen are generated and damage evolution is simulated using the discrete element method. In the virtual concrete lab, the simulated ultrasonic wavefield is propagated from one transducer using a realistic source signal and recorded at a second transducer. Different damage scenarios reveal a different slope in the decorrelation of waveforms with the observed reduction in velocities in the material. Finally, the impact and possible generalizations of the findings are discussed and recommendations are given for a potential application of CWI in concrete at structural scale.

show abstract

Cementitious Composites with High Compaction Potential: Modeling and Calibration

Cited by 16 publications

References 39 publications

Supersulfated Cement Applied to Produce Lightweight Concrete

Supersulfated Cement Applied to Produce Lightweight Concrete

Numerical Simulation Based Damage Identification in Concrete

Sensitivity of Ultrasonic Coda Wave Interferometry to Material Damage - Observations from a Virtual Concrete Lab

Contact Info

Product

Resources

About