Self-sensing capability of Engineered Cementitious Composites: Effects of aging and loading conditions

Yıldırım, Gürkan; Öztürk, Oğuzhan; Al-Dahawi, Ali; Ulu, Adem Afşın; Şahmaran, Mustafa

doi:10.1016/j.conbuildmat.2019.117132

Cited by 89 publications

(28 citation statements)

References 35 publications

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“…Further, as the number of curing days was increased, the resistance increased slightly because the hydration process of the cement composites occurred to completion. However, the differences in resistance corresponding to the different curing durations were insignificant [38]. Figure 9 shows the XRD patterns of the composites formed using the MWCNT solution.…”

Section: Heating Tests and Thermal Imaging Analysismentioning

confidence: 99%

“…The thermal diffusivity of the films was analyzed visually based on thermal images. into cement is to disperse the MWCNTs in a solution and then mix the solution with the cement [33][34][35][36][37][38]. In this study, however, both an MWCNT-containing solution and MWCNT-coated films were added to cement, and their effects on the heating performance and electrical resistance were measured.…”

Section: Introductionmentioning

confidence: 99%

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Self-heating and electrical performance of carbon nanotube-enhanced cement composites

Lee

Loh

et al. 2020

Construction and Building Materials

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This work hypothesizes that mixing carbon nanotubes with cement improves the thermal and electrical properties of bulk cement composites. To test this, two different methods of combining cement and dispersed multi-walled carbon nanotubes (MWCNTs) were considered. In the first method, cement composites were produced by adding a dispersion of MWCNTs to cement. In the second, MWCNT-based thin films were spray-coated and combined with cement to produce cement composites. A third group of specimens was produced using both MWCNT dispersions and MWCNT film-coated. The experimental parameters considered were the mixing method, MWCNT concentrations, number of curing days, and voltages applied. Furthermore, field emission scanning electron microscopy revealed that the MWCNTs were evenly dispersed within the composites and formed a percolated network. Additionally, X-ray diffraction analysis confirmed that the products formed during hydration of the composites (i.e., C-H and C-S-H) were the same as those generated using ordinary mortar. Upon testing these mortar-based specimens, it was found that the cement composites formed using a combination of MWCNT dispersion and MWCNT-based films exhibited the highest heating performance and lowest electrical resistance. Finally, thermal imaging showed that increased MWCNT concentrations during specimen casting led to a corresponding increase in their surface temperature upon voltage application.

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Section: Heating Tests and Thermal Imaging Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-heating and electrical performance of carbon nanotube-enhanced cement composites

Lee

Loh

et al. 2020

Construction and Building Materials

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“…Similar to mechanical properties, the corrosion resistance and electrical conductivity of cement-matrix composites have also indicated good results through the introduction carbon nanomaterials [14][15][16][17][18][19][20]. Several studies in the literature have shown that both GO and CNTs can effectively improve the mechanical properties (e.g., strength) and durability of cementitious composites-however they have adverse effects on the workability aspects [20,21].…”

Section: Introductionmentioning

confidence: 96%

Modification of cementitious composites with graphene oxide and carbon nanotubes

2020

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Both graphene oxide (GO) and carbon nanotubes (CNTs) are carbon-based nanomaterials. Due to their favorable dispersibility in water and excellent mechanical properties, they are potential additives for use as reinforcements in cementitious composites. In this laboratory study, GO and CNTs were simultaneously used as additives to improve the mechanical properties (e.g., compressive strength) and durability (e.g., frost resistance, water impermeability) of cementitious composites. To maintain and optimize the mortar fluidity, fly ash (20% by the mass of the cementitious materials) was also added into the cementitious composite. Based on the laboratory test results, the compressive strength of the cementitious composite was maximized to 43.50 MPa with an optimal dosage of 0.08% GO, by weight of the total mixture. Addition of 0.04% GO (by total mixture weight) and higher dosages of up to 0.08% exhibited a strengthening effect on the cement composites due to the simultaneous bridging effect of 0.15% CNTs and the nucleation effect of GO. Furthermore, the addition of GO and CNTs contributed to improving the freeze-thawing resistance and impermeability of the cementitious composites. Overall, the study results indicated that the addition of GO and CNTs could potentially improve the mechanical properties and durability of cementitious composites, which could be very beneficial for various industrial applications such as concrete roads or building constructions.

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“…Structural Health Monitoring (SHM) is used for the monitoring and inspection of structural efficiency of buildings and public facilities during their ongoing operation [6,7]. Commonly, SHM approaches have used embedded or structural sensors; however, such sensors are expensive, with low sensitivity and poor durability [8][9][10][11][12][13][14][15]. In this study, two types of conductive materials were used to make concrete pavement capable of sensing loads and damage in the form of cracking by detecting electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of adding additional Carbon Fiber on Piezoresistive Properties of Fiber Reinforced Concrete Pavements under Impact Load

Mohammed¹,

Al-Dahawi²,

Banyhussan³

2021

ETJ

Self Cite

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Self-sensing and mechanical behavior of FRCP under impact loads were assessed.• Carbon fibers and steel fibers were utilized to improve the mechanical and piezoresistive properties.• The best impact energy results were achieved when only 0.5 and 1.0% vol.% of CF and SF respectively. • Successful self-sensing of damage was obtained with superior performance of CF.Multifunctional Cementitious Composite (MCC) characteristics are directly related to the type and dosage of the Electrically Conductive Materials (ECMs) reinforcing the relevant concrete matrices. This study investigated the electromechanical capacities of fiber reinforced concrete pavement (FRCP) with and without the addition of micro scale-carbon fiber (CF). The impact energy of FRCP under compacted load was evaluated initially; then, the effects of 0.5% and 1% content by volume of CF on the piezoresistivity capacities of FRCP were investigated under applied impact load. This type of load is the most common force causing long-term rigid pavement deterioration. Obtained results showed that the use of a hybrid fiber (micro-scale carbon fiber 0.5% and macro-scale steel fiber 1% by volume) enhanced the impact strength (impact energy) due to CF's resistance to micro-cracks. The developed FRCP showed good results in terms of self-sensing under compact load with both 0.5 and 1.0% by volume of CF.

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Self-sensing capability of Engineered Cementitious Composites: Effects of aging and loading conditions

Cited by 89 publications

References 35 publications

Self-heating and electrical performance of carbon nanotube-enhanced cement composites

Self-heating and electrical performance of carbon nanotube-enhanced cement composites

Modification of cementitious composites with graphene oxide and carbon nanotubes

Effect of adding additional Carbon Fiber on Piezoresistive Properties of Fiber Reinforced Concrete Pavements under Impact Load

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