Characterizing fiber dispersion in cement composites using AC-Impedance Spectroscopy

Woo, Leta; Wansom, S.; Özyurt, Nilüfer; Mu, Bin; Shah, Surendra P.; Mason, Thomas O.

doi:10.1016/j.cemconcomp.2004.06.003

Cited by 86 publications

(34 citation statements)

References 14 publications

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“…Microcracking development [16], assessment of the reinforcing fibre dispersion [17], or piezoelectric and piroelectric effects [18,19] can be cited among the studied phenomena.…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy study of saturated mortar samples

Díaz

Freire

Merino

et al. 2008

Electrochimica Acta

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“…Microcracking development [16], assessment of the reinforcing fibre dispersion [17], or piezoelectric and piroelectric effects [18,19] can be cited among the studied phenomena.…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy study of saturated mortar samples

Díaz

Freire

Merino

et al. 2008

Electrochimica Acta

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“…Electrical methods, based on the effects of the fibers on the resistivity/conductivity of the composite material, have received lots of attention up to very recent years [44,45]. Ozyurt et al [46] employed the Alternate Current Impedance Spectroscopy (AC-IS) for the detection of fiber dispersion related issues and demonstrated its reliability as well as its sensitivity to fiber orientation, …”

Section: Non-destructive Monitoring Of Fiber Dispersionmentioning

confidence: 99%

Structural elements made with highly flowable UHPFRC: Correlating computational fluid dynamics (CFD) predictions and non-destructive survey of fiber dispersion with failure modes

Ferrara

Cremonesi

Faifer

et al. 2017

Engineering Structures

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Structural design with highly flowable Fibre Reinforced Concrete has to duly take into account the preferential alignment of fibers, which can be governed through the rheological properties of the fluid mixture and the casting process and by the geometry of the structure. The possibility of predicting the fiber alignment, by tailoring the casting process, and of non-destructively monitoring it, can foster more efficient structural applications and design approaches. Focusing on UHPFRC slabs with pre-arranged casting defects, the flowinduced alignment of the fibers has been predicted by means of a suitable CFD modelling approach and hence monitored via a non-destructive method based on magnetic inductance properties of the fiber reinforced composite. The comparison between the assessed data on the fibre orientation and the crack patterns as visualized by image analysis supports the effectiveness of casting flow modelling and non-destructive fiber dispersion monitoring in supporting the structural design of elements made with highly flowable fiber reinforced cementitious composites. Response to the reviewers of the manuscript ENGSTRUCT D-16-00912Structural elements made with highly flowable UHPFRC:can Computational Fluid Dynamics (CFD) and non-destructive survey of fiber dispersion complement structural design in predicting failure modes? submitted for publication to Engineering StructuresThe authors thank the reviewers for the time they have dedicated to read their manuscript and for the insightful comments they have made and for the overall evaluation of the manuscript.The authors have taken in high consideration all the comments, mainly made by the second reviewers, and have addressed them in the revised version of the manuscript, which is now resubmitted.In detail:RESPONSE TO REVIEWER 1 -The authors agree that citing "structural design" in the title may rise some expectations in the reader which the paper does not fully address. In view of this the tile has been modified as follows Structural elements made with highly flowable UHPFRC: correlating Computational FluidDynamics (CFD) predictions and non-destructive survey of fiber dispersion with failure modes? (see also response to 1st general remark of reviewer 2) -The thickness of the slab (30 mm) has been declared -Reference [93] (which has now become reference [94]) contains details about the test set-up and the mechanical test results with elaboration of the digital image correlation measurements of the cracks, which in this paper are taken as reference and simply compared with CFD predictions and ND fiber dispersion monitoring. -The citation by Svec has been added. As for the other reference cited by the reviewer, the authors are doubtful whether to cite or not since it is likely an internal publication which is not indexed nor widely available. -With reference to the slab with the defect at 1/3 of the side it is not true that the defect does not affect the crack pattern; even in the major crack does not develop along the casting defect line, the...

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“…ACI concerns the application of a low-amplitude AC excitation by surface electrodes over a range of frequencies (Woo et al 2005). The current response (i.e., gain and phase angle) could be measured by the impedance analyzer.…”

Section: Alternating Current Impedance (Aci)mentioning

confidence: 99%

Influences of PCE Superplasticizer on the Pore Structure and the Impermeability of Hardened Cementitious Materials

Zhang

Kong

2014

ACT

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The influences of polycarboxylate (PCE) superplasticizer on pore structure of hardened cement pastes (HCPs) and impermeability of hardened mortars were investigated. Cement pastes and mortars with different water to cement ratios (W/Cs) and varied superplasticizer dosages were prepared and cured for 7 days and 28 days respectively. Mercury intrusion porosimetry and alternating current impedance (ACI) were employed to characterize the pore structure of HCPs and the impermeability of hardened mortars. Results show that PCE significantly affects the pore structure of HCPs due to its impacts on the dispersion of cement grains in fresh cement pastes. The effects of superplasticizer on the pore structure are associated with W/C and curing age of cement pastes. At W/C of 0.29, increasing superplasticizer dosage results in obvious declines in total pore volume at early ages and reduces pore connectivity. By contrast, increases in total pore volume and higher pore connectivity are found when PCE is incorporated in the paste at W/C of 0.4. ACI reveals that the inclusion of PCE brings about a denser structure and enhanced impermeability of hardened mortars. It is believed that the enhanced impermeability is related to the reduced interfacial heterogeneity and the compacted interfacial zone when PCE is added.

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Characterizing fiber dispersion in cement composites using AC-Impedance Spectroscopy

Cited by 86 publications

References 14 publications

Impedance spectroscopy study of saturated mortar samples

Impedance spectroscopy study of saturated mortar samples

Structural elements made with highly flowable UHPFRC: Correlating computational fluid dynamics (CFD) predictions and non-destructive survey of fiber dispersion with failure modes

Influences of PCE Superplasticizer on the Pore Structure and the Impermeability of Hardened Cementitious Materials

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