Use of supplementary cementitious materials (SCMs) in reinforced concrete systems – Benefits and limitations

Pillai, Radhakrishna G.; Gettu, Ravindra; Santhanam, Manu

doi:10.21041/ra.v10i2.477

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…On the other hand, SCM-based concretes have a lower CH content and, hence exhibits a lower carbonation tolerance because of the prolonged pozzolanic reactions. Due to the lower amount of CH in SCM-based systems, CO 2 is able to carbonate the C-S-H faster, and hence accelerates the carbonation process (Pillai et al 2020). Singh et al (Singh et al 2019) observed that concrete containing 40 wt.…”

Section: Estimation Of Alkalinity and Free Chloride Contentsmentioning

confidence: 99%

“…1988). A study by Pillai et al (Pillai et al 2020) shows that even though concrete blended with SCMs shows a higher carbonation, it may not directly contribute to reinforcement corrosion. The propagation of corrosion, however, will still rely on the availability of moisture and oxygen, as well as the resistivity of the medium.…”

Section: Estimation Of Alkalinity and Free Chloride Contentsmentioning

confidence: 99%

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Long-term Performance of Nanoparticle Incorporated Eco-friendly Concrete in Natural Seawater Environment

Philip

Harilal

Anandkumar³

et al. 2021

Preprint

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The use of blended concrete has widely gained industrial importance owing to the CO2 gas emissions and carbon footprint resulting from the production of ordinary Portland cement (OPC). Despite the advancements, the deterioration of concrete structures raises a significant threat to their long term durability and service life in aggressive conditions. In this work, the long-term antifouling, strength and durability properties of a blended eco-friendly concrete with OPC, fly ash, nanoparticles, and corrosion inhibitor is evaluated in natural seawater for one year. The biofouling attachment, total viability count (TVC), mechanical strength, alkalinity and free chloride contents were measured and the results were compared with OPC concrete. A four-order reduction in the total biomass and total bacterial density is observed on the surface of the blended concrete. Further, a significantly lower chloride and water penetration depth, free chloride content, compact and smooth surface morphology devoid of cracks and high C-S-H content are observed in blended concrete, compared to the OPC concrete, after exposure in seawater for one year. From the results, it is seen that the blended concrete mix is promising for applications in seawater environments because of its superior biofouling resistance, mechanical properties and durability.

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Section: Estimation Of Alkalinity and Free Chloride Contentsmentioning

confidence: 99%

Section: Estimation Of Alkalinity and Free Chloride Contentsmentioning

confidence: 99%

Long-term Performance of Nanoparticle Incorporated Eco-friendly Concrete in Natural Seawater Environment

Philip

Harilal

Anandkumar³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…However, the ingression of these aggressive fluids into the concrete can be delayed by using denser concrete [12]. Incorporating binder components of lower particle size and higher fineness is necessary to decrease the concrete's permeability [13,14]. Therefore, utilizing SCMs like FA, GGBS, metakaolin, rice husk ash, etc, which possess these properties, will potentially replace cement in concrete, enhancing both durability and sustainability.…”

Section: Introductionmentioning

confidence: 99%

Taguchi-integrated grey relational analysis for multi-response optimization of mix design for alkali-activated concrete

Sheelavantar,

Pandit,

Prashanth

et al. 2024

Mater. Res. Express

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Although alkali-activated concrete (AAC) has gained significant attention as a sustainable alternative to traditional Portland cement-based concrete due to its reduced carbon emissions and improved durability, optimizing AAC mix design still remains a challenging task as it involves complex interactions between various factors, constituent materials, and their proportions. This study presents the performance based multi-response optimization of alkali-activated concrete mix using Taguchi-integrated Grey Relational Analysis aiming for improved workability, mechanical and permeability properties. This study employs Taguchi's L9 orthogonal array to reduce the experimental trials, thereby saving time and resources. The Grey Relational Analysis optimizes factors like binder ratio, solution to binder (Al/b) ratio, and molarity of NaOH and Na2SiO3/NaOH ratio, encompassing alkali-activated concrete's fresh, mechanical, and durability characteristics with structural grade properties. The results show that binder ratio (FA:GGBS) of 90:10, Al/b ratio of 0.45, 10M NaOH solution with Na2SiO3/NaOH ratio of 1 has produced the optimum alkali-activated concrete mix of structural (M40) grade.

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“…Therefore, reduction in the use of PC is one of the ways to reduce CO2 emissions by the building materials sector. In the past several decades, the partial replacement of PC with supplementary cementitious materials (SCMs) has gained wide acceptance to increase the quality of concrete and reduce CO2 emissions [4]. In the Netherlands, up to 85% of slag was used to replace PC in one of the projects during 90's.…”

Section: Introductionmentioning

confidence: 99%

A scientific rationale for the enhanced sequestration of CO2 in concrete

Kamde

Kwasny²,

Russell

et al. 2023

MATEC Web Conf.

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Oxford Economics forecasts that concrete construction will grow by 85% to USD 8 trillion worldwide by 2030 and will lead to significant usage of Portland cement (PC). Every 1 kg of PC production generates ≈0.8 kg of CO2, which is about 1.5 Gt of CO2 emission per year for PC production. One of the ways to reduce the carbon footprint of concrete is by sequestrating CO2 using of the following approaches: (i) pre-carbonation; (ii) wet-carbonation; or (iii) CO2 curing of concrete in various types of carbonation chambers. The efficiency of these methods is measured by calculating CO2 Sequestration Factor (CSF). It is reported that the CSF of carbonation curing approach is 10 to 15%. However, it was found that the method used for calculating CSF does not consider the un-carbonated parts of the specimens, hence it does not represent the actual efficiency of the CO2 sequestration methods. Therefore, modification for calculating the CSF is proposed in this paper. Using the modified method, it was found that the CSF of carbonation curing method is less than 2% and wet carbonation is the most efficient method (≈30%). Further, a way forward is proposed to enhance the CO2 sequestration in concrete, which will not compromise fresh or hardened properties of concrete and would significantly contribute to the net zero carbon agenda compared to existing approaches

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Use of supplementary cementitious materials (SCMs) in reinforced concrete systems – Benefits and limitations

Cited by 18 publications

References 20 publications

Long-term Performance of Nanoparticle Incorporated Eco-friendly Concrete in Natural Seawater Environment

Long-term Performance of Nanoparticle Incorporated Eco-friendly Concrete in Natural Seawater Environment

Taguchi-integrated grey relational analysis for multi-response optimization of mix design for alkali-activated concrete

A scientific rationale for the enhanced sequestration of CO2 in concrete

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