Characteristics of Ferrite-Rich Portland Cement: Comparison With Ordinary Portland Cement

Elakneswaran, Yogarajah; Noguchi, Noboru; Matumoto, Kazuki; Morinaga, Yuka; Chabayashi, Takashi; Kato, Hidemi; Nawa, Toyoharu

doi:10.3389/fmats.2019.00097

Cited by 34 publications

(9 citation statements)

References 21 publications

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“…Following the research presented in [ 42 ], XRD analysis of the powdered material (cement and CWA) and hydrated pastes was performed to identify the additives and further clarify the mechanisms. In Figure 8 a, the diffractograms show powders of unhydrated cement and CWA.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

et al. 2021

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This paper investigates the effectiveness of a specific crystalline waterproofing admixture (CWA) in concrete as a function of a water–binder ratio. Four concrete mixes with and without CWA were prepared; two of them with a water–binder ratio of 0.45 and two of them with a water–binder ratio of 0.55. Water permeability and compressive strength were tested on hardened concrete specimens and self-healing of cracks over time was observed. Cement paste and CWA paste were prepared to clarify the results obtained on the concrete specimens. SEM and EDS and XRD and FTIR were performed on the hardened pastes to explain the mechanism of CWA working. The results show that the addition of CWA had no significant effect on the compressive strength of the concrete, but reduced the water penetration depth in the concrete, and the reduction was more effective for mixes with lower water–binder ratio. Regarding the self-healing effect, it can be concluded that the addition of CWA improves the crack healing in concrete, but the efficiency of self-healing is highly dependent on the initial crack width. The mechanisms involved in the reduction of water penetration depth and crack healing in concrete can be explained by different mechanisms; one is creation of the CSH gel from unreacted clinker grains, then formation carbonate, and additional mechanism is gel formation (highly expansive Mg-rich hydro-carbonate) from magnesium based additives. The presence of sodium silicate, which would transform into carbonate/bicarbonate, also cannot be excluded.

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Section: Resultsmentioning

confidence: 99%

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

et al. 2021

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“…Fe/Al siliceous hydrogarnet was observed in different cementitious environments, such as PC [ 95 , 96 ] and belite-ye'elimite cements [ 97 , 98 ]. However, at low belite reaction degree, where the availability of CaO is strongly limited, the possible formation of Fe-containing strätlingite has been reported [ 97 ].…”

Section: Interaction Of Ferrous and Ferric Iron With Cement Phasesmentioning

confidence: 99%

“…The availability of thermodynamic data allows the fate of Fe(III) in cementitious systems to be predicted and compared with experimental data. For example, thermodynamic modelling was applied to predict the time-dependent evolution of the Fe(III) speciation in PC [ 95 , 96 ], blended cements [ 108 , 164 , 165 ] as well as in ferrite belite-ye'elimite cements [ 98 ]. In PC as well as in CaO rich blended cements and ferrite belite-ye'elimite cements, the formation of Fe/Al-siliceous hydrogarnet has been predicted [ 95 , 96 , 98 ] in agreement with experimental results [ 65 , 95 , 98 ].…”

Section: Thermodynamic Modelling Of Iron-cement Interactionmentioning

confidence: 99%

“…For example, thermodynamic modelling was applied to predict the time-dependent evolution of the Fe(III) speciation in PC [ 95 , 96 ], blended cements [ 108 , 164 , 165 ] as well as in ferrite belite-ye'elimite cements [ 98 ]. In PC as well as in CaO rich blended cements and ferrite belite-ye'elimite cements, the formation of Fe/Al-siliceous hydrogarnet has been predicted [ 95 , 96 , 98 ] in agreement with experimental results [ 65 , 95 , 98 ]. The formation of Fe-ettringite is predicted by thermodynamic modelling only in the presence of a surplus of CaSO 4 [ 96 ].…”

Section: Thermodynamic Modelling Of Iron-cement Interactionmentioning

confidence: 99%

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Speciation of iron(II/III) at the iron-cement interface: a review

Wieland

Miron

et al. 2023

Mater Struct

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Steel is used as reinforcement in construction materials and it is also an important component of cement-stabilized waste materials to be disposed of in deep geological repositories for radioactive waste. Steel corrosion releases dissolved Fe(II/III) species that can form corrosion products on the steel surface or interact with cementitious materials at the iron-cement interface. The thermodynamically stable Fe species in the given conditions may diffuse further into the adjacent, porous cement matrix and react with individual cement phases. Thus, the retention of Fe(II/III) by the hydrate assemblage of cement paste is an important process affecting the diffusive transport of the aqueous species into the cementitious materials. The diffusion of aqueous Fe(II/III) species from the steel surface into the adjacent cementitious material coupled with the kinetically controlled formation of iron corrosion products, such as by Fe(II) oxidation, decisively determines the extension of the corrosion front. This review summarises the state-of-the art knowledge on the interaction of ferrous and ferric iron with cement phases based on a literature survey and provides new insights and proper perspectives for future study on interaction systems of iron and cement.

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“…Siroquant Version 4.0 (Sietronics, Canberra, Australia) was used for quantitative Rietveld analysis where monotrinic and triclinic C 3 S, α-C 2 S, cubic C 3 A, C 4 AF, gypsum, portlandite, ettringite, monosulfoaluminate, and corundum were assigned as targets. The number of minerals and the degree of hydration were calculated according to this study [40].…”

Section: Xrd-rietveldmentioning

confidence: 99%

Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete

et al. 2022

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Superabsorbent polymers (SAPs) are used as internal curing agents in cementitious materials, which reduce autogenous shrinkage in concrete as they have a low water-to-cement ratios and improve the freeze–thaw resistance. However, the compressive strength of concrete may also be reduced due to additional voids in the hydrated cement matrix. In this study, we fabricated a delayed absorption type of SAP (I-SAP) composed of cross-linked modified acrylate and studied its absorption characteristics and effect on compressive strength after 28 days. Furthermore, the effect of curing conditions on the strength of concrete and hydrated cement paste with SAP were investigated. The absorption capacity of I-SAP in the synthetic pore solution and deionised water was examined and compared with that of a conventional SAP, and the former was absorbed more by I-SAP. The results revealed that the compressive strength of concrete increased with the addition of I-SAP, particularly with the curing condition of 60% RH. Although the compressive strength of hydrated cement paste with I-SAP reduced in water or sealed curing conditions, no loss of strength in the paste cured at 60% RH was seen. The cement matrix densification due to hydration of belite around the SAP surface is the main mechanism for strength development in concrete cured at sealed and 60% RH. However, the voids formed by SAP control the compressive strength of hydrated paste.

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Characteristics of Ferrite-Rich Portland Cement: Comparison With Ordinary Portland Cement

Cited by 34 publications

References 21 publications

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

The Effect of Crystalline Waterproofing Admixtures on the Self-Healing and Permeability of Concrete

Speciation of iron(II/III) at the iron-cement interface: a review

Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete

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