Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Lee, Tae-Gyu; Lee, Jae-Hyun

doi:10.3390/app10082972

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…As per Fig. 1 , the bio-engineered CaCO 3 is nano-scaled in size, and hence has a finer particles size as compared to the Ordinary Portland Cement (OPC) particles (which is in the range of 10μm in average) 95 . This fine aspect would likely improve the particle packing of concrete and give a superior spacer effect.…”

Section: Randd Translations: Potential Technological Applicationsmentioning

confidence: 93%

“…From cost effectiveness viewpoint, CaCO 3 can be used as a filler in Portland cement, reducing the product’s high cost. It was evidenced that replacement of cement by just 2% CaCO 3 helps reduce the CO 2 emission from cement plants by 69%, meeting the economic and environmental aspects of fly ash as well as contributing equal positive effects to concrete 93 – 95 .…”

Section: Randd Translations: Potential Technological Applicationsmentioning

confidence: 99%

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Room temperature bio-engineered multifunctional carbonates for CO2 sequestration and valorization

Mohamed,

Hkiri,

Botha

et al. 2023

Sci Rep

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This contribution reports, for the first time, on an entirely green bio-engineering approach for the biosynthesis of single phase crystalline 1-D nano-scaled calcite CaCO3. This was validated using H2O as the universal solvent and natural extract of Hyphaene thebaica fruit as an effective chelating agent. In this room temperature green process, CaCl2 and CO2 are used as the unique source of Ca and CO3 respectively in view of forming nano-scaled CaCO3 with a significant shape anisotropy and an elevated surface to volume ratio. In terms of novelty, and relatively to the reported scientific and patented literature in relation to the fabrication of CaCO3 by green nano-chemistry, the current cost effective room temperature green process can be singled out as per the following specificities: only water as universal solvent is used, No additional base or acid chemicals for pH control, No additional catalyst, No critical or supercritical CO2 usage conditions, Only natural extract of thebaica as a green effective chelating agent through its phytochemicals and proper enzematic compounds, room Temperature processing, atmospheric pressure processing, Nanoscaled size particles, and Nanoparticles with a significant shape anisotropy (1-D like nanoparticles). Beyond and in addition to the validation of the 1-D synthesis aspect, the bio-engineered CaCO3 exhibited a wide-ranging functionalities in terms of highly reflecting pigment, an effective nanofertilizer as well as a potential binder in cement industry.

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Section: Randd Translations: Potential Technological Applicationsmentioning

confidence: 93%

Section: Randd Translations: Potential Technological Applicationsmentioning

confidence: 99%

Room temperature bio-engineered multifunctional carbonates for CO2 sequestration and valorization

Mohamed,

Hkiri,

Botha

et al. 2023

Sci Rep

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“…Tang and Utgenannt [5] have suggested that the corrosion at the spacer locations may be due to the highly porous structure within the spacer itself. The supplementary cementitious materials (e.g., GGBS and fly ash) and polycarboxylate-based admixture were considered in the mix of concrete and spacer to improve their microstructures, as several studies [24] showed that these materials had a positive influence on the chloride resistance of concrete. * G5-20 aggregate was used for the chloride-resistant HPC(C).…”

Section: Design Of Concrete and Spacersmentioning

confidence: 99%

Study of the Effect of Surface Treatment on the Chloride Ion Transport at the Cementitious Spacer–Concrete Interface

et al. 2020

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Spacers are important components in reinforced concrete structures to provide cover between the steel reinforcement and the formwork. Cementitious spacers are of particular interest for coastal engineering structures, as they are compatible with cement-based chloride-resistant high-performance concrete compared to plastic and steel spacers. However, the cementitious spacer–concrete interface was found to be highly porous and microcracked. This study investigated the effect of surface treatment on the chloride ion transport at the cementitious spacer–concrete interface. A surface treatment technique for potential mass production was introduced and the state-of-practice tests of the hardened concrete were modified to evaluate the performance of the spacer–concrete composite specimens. The results showed that the surface treatment on a cementitious spacer improved the bonding between the spacer and concrete at the interface. The surface treatment of the spacer improved the compressive strength and the chloride resistance of the composite specimen locally compared to those without surface treatment. The advantage of surface treatment on the chloride resistance was partially represented in either the diffusion coefficient or the column electric flux. The maximum chloride ion penetration depth at the spacer–concrete interface was recommended as an additional proxy for the evaluation of the chloride resistance performance of composite specimens.

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“…FA does not have the ability to bind particles or aggregates like cement, but with the fines size and presences of water in mix design, then SiO2 contained in FA will react chemically with Ca(OH)2 which formed by hydration process of cement and produces a substance that has bind ability. [5] Due to characteristics of both materials, many research by scientists had been developed and found many benefit of those material for substitute or partial replacement of cement such environmental friendly (due to reusing a waste material), increasing resistance to sulphate / chloride [6]- [10], reducing bleed rates [11], increasing compressive strength [2], [8], [12]- [15], increasing durability [8], [13], [16], and reducing permeability of concrete [8].…”

Section: Introductionmentioning

confidence: 99%

Flexural Strength Analysis of Concrete With the Addition B3 Waste as an Additive to Ordinary Portland Cement

Puspita¹,

Arti²,

Febryandi³

2021

Atlantis Highlights in Engineering

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As generally known that concrete has low resistance to acidic and corrosive materials which usually exist in acidic and saline environment. And along the increasing of environment conservation, specifically about reusing a waste which is residue of an activity and/or a production process of industries such as metallic, mining, chemical, etc., that pollute the living environment without proper treatment as known as B3 wastes. Among materials belong to B3 waste category are Ground Granulate Blast Furnace Slag (GGBFS) and Fly Ash (FA). The objective of this study is to use GGBFS and FS as an additive and replacement materials of cement and to find the effect of these material to flexural strength of cement. This study uses a beam-shaped specimen with 10 mixed variations consisting of normal concrete (0%), BFG (2%, 2%), BFG (2%, 4%), BFG (2%, 6%), BFG (4%, 2%), BFG (4%, 4%), BFG (4%, 6%), BFG (6%, 2%), BFG (6%, 4%), BFG (6%, 6% ) of cement weight. The results of flexural strength testing show that the mix variation of FA and GGBFS will be increase the average flexural strength of concrete than normal concrete without partial replacement of cement, and the optimum flexural strength had resulted by maximum addition of GGBFS content. Based on that, the material which is more preferable as partial replacement of OPC is GGBFS.

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Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Cited by 4 publications

References 31 publications

Room temperature bio-engineered multifunctional carbonates for CO2 sequestration and valorization

Room temperature bio-engineered multifunctional carbonates for CO2 sequestration and valorization

Study of the Effect of Surface Treatment on the Chloride Ion Transport at the Cementitious Spacer–Concrete Interface

Flexural Strength Analysis of Concrete With the Addition B3 Waste as an Additive to Ordinary Portland Cement

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