Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Wachira, Jackson Muthengia

doi:10.1155/2019/2123547

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Perhaps this could have been due to limited space for the pozzolana reaction as well as hydration of residual cements. A decreased w/c ratio is a well-known factor in increasing the resistance of concrete/mortar by lowering permeability and porosity [48][49][50][51][52][53][54][55].…”

Section: Resultsmentioning

confidence: 99%

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Wachira

Marangu

2019

Advances in Materials Science and Engineering

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This paper reports study findings on the diffusivity of chloride ions in potential blended cement. The cement, abbreviated as PCDC, was made from blending ordinary Portland cement (OPC) with dried calcium carbide residue and an incinerated mix of rice husks, spent bleaching earth, and broken bricks. The aim of the study was to investigate the ability of PCDC to withstand aggressive chloride environment. 10 cm × 10 cm mortar cubes were prepared using PCDC and cured for 28 days in saturated calcium hydroxide solution. The cured mortar cubes were subjected to aggressive chloride media in a laboratory set up. The test cement was subjected to chloride profile analysis with depth of cover as a function of w/c ratio and curing period in alternate dry and wet environments of 3.5 percent sodium chloride solution. The experiments were carried alongside neat OPC and OPC + 25% pulverised fuel ash (OPC + 25% PFA). Results showed that PCDC exhibited lower chloride ingress as the depth of cover increased. In conclusion, the study showed that PCDC was a potential cementitious material with high ability to withstand aggressive environment of chlorides.

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Section: Resultsmentioning

confidence: 99%

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Wachira

Marangu

2019

Advances in Materials Science and Engineering

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“…The duration of initiation period is analysed by how swiftly the concrete cover is cracked or spalled. As a result, activating substances penetrate the steel, speeding up the corrosion process [4,5]. The literature study follows stepwise evaluation and these are discussed next, a)…”

Section: Introductionmentioning

confidence: 99%

Effect of Corrosion and Transverse Reinforcement on Flexural Response of 3D Finite Element Reinforced Concrete Beams

Amini¹,

Rajput²

2022

Proceedings of the 7th International Conference on Civil, Structural and Transportation Engineering (ICCSTE'22)

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“…The duration of initiation period is analyzed by how swiftly the concrete cover is cracked or spalled. As a result, activating substances such as chlorides and CO2 penetrate the steel, speeding up the corrosion process [4][5]. The literature study follows stepwise evaluation by various researchers who are discussed next, a) Mechanical Experiments on Corroded Reinforcement Bars: Almusallam [6] explained a reduction in tensile strength with increased corrosion resulting in brittle failure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Corrosion Location and Transverse Reinforcement on Flexural-Ductile Response of Reinforced Concrete Beams

Amini¹,

Rajput²

2022

IJCI

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Concern about premature ageing and deterioration of reinforced concrete (RC) structures primarily stems from reinforcement corrosion. The reinforcement corrosion not only reduces the effective cross-section of reinforcing bars but also causes a severe reduction in the structural performance and service life of RC structures. This study aims to analyze the effect of varying corrosion levels on the load-bearing ability of RC beams configured with varying amounts of transverse reinforcement. The idea pertinent to this study is to develop and validate a 3D finite element numerical model of RC beams and subsequently simulate the corrosion deterioration to assess the effect of corrosion deterioration on the flexural response of RC beams. The beam models have been analyzed with a four-point simply supported bending flexural test. For concrete-steel interaction simulation, the cohesive surface interaction method proved to be most suitable as the results aligned well with the analytical results. Loss of bond in concrete-rebar interface due to decrease in mechanical interlock is calculated. The concrete Damage Plasticity model is adopted for calculating concrete's confined and unconfined strength in tension and compression. A parametric study is also performed to investigate varying corrosion percentages on residual capacity, stiffness, energy dissipation and behaviour of corroded beams. Flexural strength response due to spacing of transverse reinforcements as per different Indian standard codes is analyzed. Spalling stress is calculated analytically and used in simulation data for more precise results. The results indicate a notable reduction in loaddeflection behaviour due to concrete spalling, deterioration of rebars ribs, loss in mechanical interlock mechanism and yield strength. The structure undergoes an absolute brittle failure at very high corrosion levels due to a complete steel-concrete bond loss. A good correlation between the developed FE model and experimental load-deflection curves was observed, with variability in ultimate load-bearing capacities of less than 5% for all the cases.

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Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Cited by 8 publications

References 21 publications

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Effect of Corrosion and Transverse Reinforcement on Flexural Response of 3D Finite Element Reinforced Concrete Beams

Effect of Corrosion Location and Transverse Reinforcement on Flexural-Ductile Response of Reinforced Concrete Beams

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