Self-Sensing of Flexural Damage in Large-Scale Steel-Reinforced Mortar Beams

Sarwary, Mohammad Haroon; Yıldırım, Gürkan; Al-Dahawi, Ali; Khiavi, Kaveh A.; Toklu, Kenan; Şahmaran, Mustafa

doi:10.14359/51715581

Cited by 24 publications

(19 citation statements)

References 48 publications

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“…A higher GO content is able to reduce the expansion effects of concrete due to the penetration of sulphate suspension. The increase in expansion was also due to the growth of ettringite-filled holes and cracks on the surface of the cement composite [ 40 , 70 ]. Moreover, the formation of ettringites employs a larger area, being responsible for the expansion and cracking behavior of ECC [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

“…It was observed that mixes 5–9 had similar percentages of both CR and GO. These five replicates are the central point that the software (RSM) used to improve the precision of the experiment against any likely errors [ 40 , 62 , 63 , 70 ]. This is because, during optimization by RSM, the CR percentage of 5% and the GO percentage of 0.03% are considered as the central point; therefore, repetition is required for the accuracy of data and results.…”

Section: Resultsmentioning

confidence: 99%

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Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

et al. 2020

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The objective of this research was to determine the durability of an engineered cementitious composite (ECC) incorporating crumb rubber (CR) and graphene oxide (GO) with respect to resistance to acid and sulphate attacks. To obtain the mix designs used for this study, response surface methodology (RSM) was utilized, which yielded the composition of 13 mixes containing two variables (crumb rubber and graphene oxide). The crumb rubber had a percentage range of 0–10%, whereas the graphene oxide was tested in the range of 0.01–0.05% by volume. Three types of laboratory tests were used in this study, namely a compressive test, an acid attack test to study its durability against an acidic environment, and a sulphate attack test to examine the length change while exposed to a sulphate solution. Response surface methodology helped develop predictive responsive models and multiple objectives that aided in the optimization of results obtained from the experiments. Furthermore, a rubberized engineered cementitious composite incorporating graphene oxide yielded better chemical attack results compared to those of a normal rubberized engineered cementitious composite. In conclusion, nano-graphene in the form of graphene oxide has the ability to enhance the properties and overcome the limitations of crumb rubber incorporated into an engineered cementitious composite. The optimal mix was attained with 10% crumb rubber and 0.01 graphene oxide that achieved 43.6 MPa compressive strength, 29.4% weight loss, and 2.19% expansion. The addition of GO enhances the performance of rubberized ECC, contributing to less weight loss due to the deterioration of acidic media on the ECC. It also contributes to better resistance to changes in the length of the rubberized ECC samples.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

et al. 2020

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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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“…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%

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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Self-Sensing of Flexural Damage in Large-Scale Steel-Reinforced Mortar Beams

Cited by 24 publications

References 48 publications

Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

Modification of cementitious composites with graphene oxide and carbon nanotubes

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

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