Passive film formation and corrosion initiation in lightweight concrete structures as compared to self compacting and ordinary concrete structures at elevated temperature in chloride rich marine environment

Wasim, Muhammad; Hussain, Raja Rizwan

doi:10.1016/j.conbuildmat.2015.01.024

Cited by 22 publications

(15 citation statements)

References 9 publications

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“…Self-compacting concrete (SCC) is an innovative and indispensable concrete type which capable of filling up the formwork, providing better compaction, passing-ability in restricted and confined areas without segregation or bleeding by self-weight thanks to its high workability. Therefore, SCC provides reduction in the labor cost because of no need vibration and gaining time [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, pumice occurs as a result of the disentanglement of gases in the course of the formation of lava. While total pumice reserve of the world is around 18 billion m 3 , total pumice reserve of Turkey is around 7.4 billion m 3 [16]. Specific structure of pumice has been consisted by air voids or bubbles when gases in molten lava are trapped during cooling [17].…”

Section: Introductionmentioning

confidence: 99%

“…Basic pumice can also be termed as basaltic pumice or scoria [21]. Acidic pumice with white and off-white color has a hardness of 5-6 according to Mohs scale and a density of 0.5-1g / cm 3 . The BP has a hardness of 5-6 and a density of 1-2 g/cm 3 and it can be dark and brownish blackish colored [21,22].…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

Yücel

Öz

Güneş

2020

Green Building & Construction Economics

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In this study, properties of self-compacting concretes (SCCs) containing acidic and basic pumice (AP-BP) was investigated. SCCs incorporating AP-BP (SCCAs-SCCBs) were produced with constant slump flow diameter of 720±20 mm and 690±20 mm by adjusting superplasticizer (SP), respectively. Control mixture was designed with totally crushed stone aggregate. SCCAs and SCCBs could be produced up to 100% coarse AP with 20% increments and 60% coarse BP with 10% increments, respectively, to ensure the desired limit values for SCC. Firstly, fresh properties of SCCs were determined. Then, the mechanical and durability properties of SCCs were measured at 28 and 56 days. Test results indicated that workability properties of SCCAs are markedly higher than that of SCCBs. Additionally, mechanical and durability performances of SCCs decreased with increasing of AP and BP. The compressive strengths of SCCs containing 60% AP and BP decreased approximately 28-29% and 22-24%, compared to the control mixture, respectively. Similarly, modulus of elasticity of same mixtures decreased around 35-39% and 17-19%, respectively. However, all results indicated that SCCs produced with AP and BP provided the available limits in the design of SCC. Additionally, SCCBs exhibited higher performance than SCCAs in terms of hardened properties. Moreover, high correlation coefficients (R2>0.89) between the durability and mechanical properties were found for SCCs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

Yücel

Öz

Güneş

2020

Green Building & Construction Economics

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“…Zhang et al [12][13][14][15][16] studied the fretting fatigue failure behavior of hoisting rope in different environments and found that alkaline media can accelerate rope damage in their fretting running. According to the literatures [17][18][19][20][21][22][23][24][25][26][27][28], metals exposed to different surroundings display different corrosion rates because of different types of corrosive ions in such surroundings. Considering those coastal regions where many high-voltage transmission lines are operated, which are subjected to severe damage caused by the interaction between corrosive medium and fretting wear [29][30][31][32][33][34][35], it is necessary to investigate the fretting wear behaviors of ACSR conductors in marine environments which may be a problem for ACSR conductors in these areas.…”

Section: Introductionmentioning

confidence: 99%

Fretting Wear Behaviors of Aluminum Cable Steel Reinforced (ACSR) Conductors in High-Voltage Transmission Line

Gao

Zhang

2017

Metals

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This work reports the fretting wear behavior of aluminum cable steel reinforced (ACSR) conductors for use in high-voltage transmission line. Fretting wear tests of Al wires were conducted on a servo-controlled fatigue testing machine with self-made assistant apparatus, and their fretting process characteristics, friction force, wear damage, and wear surface morphology were detailed analyzed. The results show that the running regime of Al wires changes from a gross slip regime to a mixed regime more quickly as increasing contact load. With increasing amplitudes, gross slip regimes are more dominant under contact loads of lower than 30 N. The maximum friction force is relatively smaller in the NaCl solution than in a dry friction environment. The primary wear mechanisms in dry friction environments are abrasive wear and adhesive wear whereas abrasive wear and fatigue damage are dominant in NaCl solution.

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“…Therefore, it is recommended for the construction of concrete structures located in harsh environments where it is exposed to severe physical and chemical attacks (Feng et al 2010). Consequently, serviceability is improved, and service life is extended for such structures with their repair cost reduced (Wasim and Hussain 2015). Those compensate for the additional cost paid for using relatively high binder and admixtures contents in SCC (Okamura and Ozawa 1995;ACI Committee 318 2005).…”

Section: Introductionmentioning

confidence: 99%

Chloride intrusion into thermally damaged self-compacting concrete

Haddad

Hinawi²

2015

Can. J. Civ. Eng.

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The post-heating resistance of limestone SCC against chloride intrusion is investigated considering key parameters such as water-to-cement ratio (0.4, 0.45, and 0. 5), relative humidity and elevated temperature (300 and 400°). SCC mixtures were proportions to confirm to universal specification with regard to different workability requirements.Chloride profiles were determined for post-heated and companion prismatic (100x100x250mm) specimens, kept at room temperature. Consequently, diffusion coefficients were determined upon Fick's steady state formula. Post-heating damage was quantified, as well, using various techniques such as ultrasonic pulse velocity waves, resonant frequency, compression test measurements. The results indicated significant reductions in compressive strength and estimated dynamic modulus ranging from (20 to 60%) and (10 to 40%), respectively, with a corresponding increase in chloride diffusion coefficient reaching 80%. Both temperature and relative humidity levels had tangible impact on post-heating damage of SCC, hence percentage increase in chloride diffusion coefficient. The empirical models developed in this work showed excellent correlation between various damage indices and the percentage increase in diffusion coefficient.Furthermore, the electrical charge passing through SCC compared very well with the percentage increase in diffusion coefficient.Keywords: Corrosion, Chloride, Self-compacting concrete, Diffusion, Thermal-damage. IntroductionCorrosion of reinforcing steel in concrete is the most significant deterioration process affecting reinforced concrete structures. The two most important causes of corrosion of the reinforcing steel are carbonation and chloride contamination of the concrete. The ingress of chloride into concretes depends upon many factors; the most important of which is the cracking status of the concrete structures. Cracking in concrete structures may be inherent or as result of structural design faults, construction deficiencies, fire attack and/or lack of long term durability (Saetta 2005). Corrosion is accompanied by a loss of rebar cross-section and a build-up of corrosion products, which occupy a larger volume than the original metal from which they were derived. This generates tensile stresses causing cracking and spalling of the cover, which may results in significant deterioration in structural elements in a short of period of time.Research works, concerned with the effect of load induced cracks on the chloride profile in concrete, showed that chloride ingress in concrete is dependent upon the size and depth of generated cracks (Rodriguez 2001;Gowripalan et al. 2005). The research findings indicated that relatively high pre-loading stresses are needed to affect significantly the ingress of chloride into concrete. Those investigated the effect of moisture content and freezing and thawing on the chloride profile revealed that relatively high number of freezing and thawing cycles would be needed to create internal damaged; that is high Research Significance...

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Passive film formation and corrosion initiation in lightweight concrete structures as compared to self compacting and ordinary concrete structures at elevated temperature in chloride rich marine environment

Cited by 22 publications

References 9 publications

The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

Fretting Wear Behaviors of Aluminum Cable Steel Reinforced (ACSR) Conductors in High-Voltage Transmission Line

Chloride intrusion into thermally damaged self-compacting concrete

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