Enhanced seawater corrosion resistance of reinforcement in nanophase modified fly ash concrete

Uthaman, Sudha; George, R.P.; Vishwakarma, Vinita; Harilal, Manu; Philip, John

doi:10.1016/j.conbuildmat.2019.06.070

Cited by 56 publications

(26 citation statements)

References 52 publications

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“…Nano-CaCO 3 material with a size range of 50-100 nm was used in this experiment. Nanoparticles have a tendency to agglomerate in concrete with high concentration of nano-CaCO 3 , resulting in higher particle sizes [20,21]. The tendency of nanoparticle agglomeration reduces the ability to act as an effective filler in concrete [22,23].…”

Section: Experimental Methodsmentioning

confidence: 99%

Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis

et al. 2020

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The carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) has been increasingly attracting a widespread attention because of the advantages of using the excellent properties of nanomaterials to improve structural properties. An active sensing approach based on a piezoceramic transducer is developed to detect the interfacial debonding performance of CFRP-SNCB. A CFRP-SNCB specimen was fabricated and subjected to periodic loading test to initiate the debonding damage. Three piezoceramic smart aggregates (SAs) and three piezoceramic smart nanomaterial aggregates (SNAs) are embedded in the specimen and used as an actuator and sensor. Experiments show that the nanomaterial concrete becomes a good conduit for wave propagation due to the nucleation and filling effect of nanomaterial. The stress wave signal caused by the embedded SNAs is more sensitive to the debonding performance between CFRP and concrete than SA. The attenuation of stress wave caused by the increase of the severity of debonding damage can be clearly observed from the signals received from SAs and SNAs in the frequency domain analysis. The debonding cracking of the tension end region is earlier than the bond end region, which proves the starting point of structural debonding damage. Furthermore, the debonding state can be evaluated by wavelet packet analysis. The research results demonstrate that the proposed method has potentials to detect the interfacial debonding performance of CFRP-SNCB.

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Section: Experimental Methodsmentioning

confidence: 99%

Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis

et al. 2020

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“…It is important to note that this experimental arrangement is very little used in the study of corrosion of reinforcing steel in reinforced concrete structures, so the proposal in the present investigation is of great importance and innovation, since it simulates the situation of displacing the foundations of all types of civil Infrastructure, in soils where significant concentrations of aggressive agents such as chlorides and sulfates may be found, as commented in the introduction, there are few concrete corrosion studies carried out, considering to the soils as aggressive contact media for the elements such as footings, piles, foundation slabs, which are the elements that support buildings, bridges, highways and industrial plants however, there are a large number of corrosion studies of reinforcing steel considering aggressive media such as seawater (Chaleea et al, 2009;Uthaman et al, 2017), solutions simulating marine or sulphated environments (Duarte et al, 2014;Santiago et al, 2016b), studies carried out in situ, with exposure to the atmosphere (De Vera et al, 2017;Kwon et al, 2017), investigations with alkaline solutions simulating the pore solution in the concrete (Williamsona and Burkan, 2016;Verbruggen et al, 2017) etc. ; for all the above, it is the relevance of the results obtained, analyzed and discussed in this research.…”

Section: Exposure Of Specimens To Soil Contaminated Mh Typementioning

confidence: 99%

Corrosion Behavior of Galvanized Steel Embedded in Concrete Exposed to Soil Type MH Contaminated With Chlorides

et al. 2019

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Polarization Resistance. LPR (ASTM-G59). The specimens were buried in a soil type MH contaminated with 0, 1, 2, and 3 wt.% NaCl as aggressive agent by weight of soil, the exposure time was 260 days where, the results show that when the presence of NaCl in the soil was increased to 2 and 3% the levels of corrosion are from high to very high in all concretes, presenting a little better performance the concretes reinforced with galvanized steel and a small benefit could be identified or related to the properties of a denser and less impermeable matrix that presented the concrete mix made with cement CPC 30R RS.

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“…Corrosion is deleterious to the service life of concrete structures in respect of significant depletion of their durability results in increasing the maintenance expenditure than construction cost. In some cases, a reduction in lifetime occurs due to the disintegration of steel rebar in concrete structures [1][2][3][4][5][6][7][8][9][10]. Broadly, the term concrete corrosion indicates chemical or physicochemical disintegration of concrete components and structures, due to the attack of corroding agents like CO2, chlorides, sulphates, fluorides, nitrates etc.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations

et al. 2020

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The capacity of penta sodium triphosphate (PST) to avert the steel reinforcement corrosion in contaminated concrete by NaCl was investigated for 480 days using electrochemical impedance spectroscopy, potentiodynamic polarization, half-cell potential and gravimetric methods. The mechanism of interaction of PST molecules and the changes took place on the steel surface assessed using spectroscopic and microscopic analysis. Compression tests of the concrete specimens were performed to monitor the strength of concrete after the addition of PST. Investigations proved that PST acts as a competent admixture for inhibiting the corrosion of steel reinforcement in concrete without affecting its strength for a longtime.

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Enhanced seawater corrosion resistance of reinforcement in nanophase modified fly ash concrete

Cited by 56 publications

References 52 publications

Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis

Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis

Corrosion Behavior of Galvanized Steel Embedded in Concrete Exposed to Soil Type MH Contaminated With Chlorides

Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations

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