Efficiency and corrosion characteristics of high performance cementitious composites as a strengthening material

Atta, A.A.; Ali, Nehal; Taman, Mohamed

doi:10.1016/j.compositesb.2018.11.105

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…There was no difference between the failure mode of specimens B10%-T and B10%-C. However, the cracking pattern of specimen B10%-T was characterized by multiple, small width cracks due to the high-performance mortar as concluded by Atta et al (2019). The failure mode of specimen B15%-T was similar to B10%-T but with lower capacity and with multiple cracks.…”

Section: Resultsmentioning

confidence: 84%

“…Different corrosion levels, 10% and 15% mass loss, were achieved for specimens by means of a constant impressed current, as described later. The proposed corrosion rates were chosen similar to many previous research works (Al-Saidy et al, 2010; Atta et al, 2019; Kobayashi and Rokugo, 2013). In addition to a non-corroded control specimen, two corroded control specimens were tested with 10% and 15% mass losses without strengthening to determine the effect of different strengthening techniques.…”

Section: Experimental Programmentioning

confidence: 99%

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Using high-performance cementitious mortar and external prestressing for retrofitting of corroded reinforced concrete beams

Atta

Taman

2020

Advances in Structural Engineering

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The effect of using high-performance polypropylene fiber–reinforced cementitious mortar on reinforced concrete beam repair was presented in this article. Results of an experimental study for the flexural performance of 13 reinforced concrete beams were presented. The corrosion level, in terms of the mass loss of steel, was estimated to be 10% and 15%. Three non-strengthened specimens were tested as a reference: one control uncorroded specimen and two control specimens corroded with 10% and 15%. Ten specimens were strengthened using different techniques; replacement of the spilled concrete at the tension zone with 40-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar, using external prestressing bars at the tension zone with adding 20-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar at the compression zone, and a combination of these techniques. The prestressing reinforcing bars stress was chosen to be 0.25 fpy and 0.38 fpy for the corroded 10% specimens and 0.25 fpy for the corroded 15% specimens. A combination of 40-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar at the tension side and external prestressing bars at the tension zone increased the specimen capacity by 15% and 34% compared with the uncorroded and 10% corroded control specimens, respectively. A comparative study was conducted to evaluate the efficiency of various strengthening techniques. An analytical model was proposed in order to give design guidelines.

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Section: Resultsmentioning

confidence: 84%

Section: Experimental Programmentioning

confidence: 99%

Using high-performance cementitious mortar and external prestressing for retrofitting of corroded reinforced concrete beams

Atta

Taman

2020

Advances in Structural Engineering

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“…Durability is a main concern for safety of reinforced concrete structures [1][2][3]. Corrosion of steel reinforcements is considered as the major cause of concrete deteriorations, followed by frost action in cold climates and physico-chemical effects in aggressive environments [4].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of electrochemical extraction of chlorides in fly ash concrete using carbon fibre mesh anode

et al. 2020

Construction and Building Materials

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This paper presents an experimental study on the effect of anode format (carbon fibre sheet (Cs), mesh (Cm) and plate (Cp)), current density (0, 1, 2, and 3 A/m 2 referred to the surface area of reinforcement), and fly ash content (plain concrete, 10%, 20% and 30% replacement by weight of cement) on the efficiency of electrochemical chloride extraction (ECE). The results showed the total extracted chloride contents of samples treated with different anodes had an order of Cs > Cm > Cp. The distribution of anodic reaction products indicated that only a small part of Cs played as anode because of the insulation in its transverse direction while Cm performed better conductivity uniformity and accordingly higher usage. With the increase of current density, the extracted chloride content improved, but the improvement was very limited when the current density kept rising. The incorporation of fly ash led to 12% ~ 153.1% improvement in extracted chlorides. After ECE, the measured residual free chloride content in concrete did not change with current density or fly ash content, except for the cases when current density was increased from 0 to 1 A/m 2 . The additional extracted chlorides with increasing current density or fly ash content can be attributed to the dissolution of bound chlorides. The contribution of increasing compactness by adding fly ash was offset by the destruction of Friedel's salt and the resulting release of chloride ions in the alkali environment and under the impressed currents.

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A state-of-the-art review on Ag/AgCl ion-selective electrode used for non-destructive chloride detection in concrete

Zhang

et al. 2020

Composites Part B: Engineering

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Efficiency and corrosion characteristics of high performance cementitious composites as a strengthening material

Cited by 7 publications

References 21 publications

Using high-performance cementitious mortar and external prestressing for retrofitting of corroded reinforced concrete beams

Using high-performance cementitious mortar and external prestressing for retrofitting of corroded reinforced concrete beams

Efficiency of electrochemical extraction of chlorides in fly ash concrete using carbon fibre mesh anode

A state-of-the-art review on Ag/AgCl ion-selective electrode used for non-destructive chloride detection in concrete

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