The reaction between metakaolin and limestone and its effect in porosity refinement and mechanical properties

Zunino, Franco; Scrivener, Karen

doi:10.1016/j.cemconres.2020.106307

Cited by 225 publications

(64 citation statements)

References 17 publications

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“…In the study Wyrzykowsky and Lura [150] the OPC that was properly sulfated at a w/b ratio of 0.30 became under-sulfated at a w/b ratio of 0.16. As observed by Zunino and Scrivener [125], the sulfate depletion occurred slightly early in the LC 3 system, with a w/b ratio of 0.4 compared to the mixture w/b ratio of 0.8. Despite delaying the sulfate depletion, the increase in w/b ratio enhanced the aluminate peak of LC 3 systems [125].…”

Section: Water/binder Ratiosupporting

confidence: 66%

“…As reported by many researchers, replacing cement (clinker + calcium sulfate) by SCMs as slags [106,107], fly ash [99,[108][109][110][111] (especially high calcium fly ashes [108,111]), silica fume [112], calcined clay [9,[113][114][115][116], limestone [9,117], red mud [118,119], zeolite [120], and ground waste expanded perlite (highly reactive pozzolan) [112], usually anticipate sulfate depletion, thus increasing the sulfate demand per clinker. Because of the high amounts of calcined clay and limestone, LC 3 cements usually require more gypsum in comparison with plain Portland cement [9,[121][122][123][124][125][126]. As demonstrated by Zunino and Scrivener [9] (Fig.…”

Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 95%

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Effects of sulfates on the hydration of Portland cement – A review

Neto

Torre

Kirchheim

2021

Construction and Building Materials

129

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Section: Water/binder Ratiosupporting

confidence: 66%

Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 95%

Effects of sulfates on the hydration of Portland cement – A review

Neto

Torre

Kirchheim

2021

Construction and Building Materials

129

View full text Add to dashboard Cite

show abstract

“…A stronger aluminate hydration peak occurred due to the additional calcium sulphate in the mix and it appeared earlier in LC 3 than the SLSC. In addition to the acceleration of silicate and aluminate hydration in LC 3 in comparison with SLSC, a third peak corresponding to the carboaluminate formation was noticed at around 34 hours [30]. No such clear peak of carboaluminate was noticed in SLSC sample.…”

Section: Heat Of Hydration Measured Using Isothermal Calorimetermentioning

confidence: 88%

“…The SEM-EDX analysis in Figure 9 shows that with the replacement of OPC with SCMs, a reduction in calcium to silica ratio (Ca/Si) can be noticed. While the Ca/Si is similar in LC 3 and SLSC, the amount of alumina (Al) incorporated in C-A-S-H is higher in LC 3 due to the higher Al content in the clay as compared to the slag [19,28,30,32]. A higher spread in the composition of the C-A-S-H was observed in the blended systems compared to the OPC.…”

Section: Sem-edxmentioning

confidence: 98%

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Hydration behaviour of limestone-calcined clay and limestone-slag blends in ternary cement

Parashar¹,

Bishnoi²

2021

RILEM Tech Lett

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The effect of kaolinitic calcined clay and slag on the hydration of limestone-containing ternary blended cements was investigated. The effect of alumina from different sources of SCMs was considered to activate the formation of carboaluminates. Ternary blends with 50% ordinary portland cement clinker, 45% blends of limestone calcined clay (LC2) in 1:2 blend and slag limestone blend (SLS) in 2:1 mix proportion with 5% of gypsum were studied. The hydration behaviour was analysed based on cement mortar compressive strength, heat of hydration using an isothermal calorimeter and bound water measured using thermal gravimetric analysis (TGA). In addition, the degree of hydration of clinker phases and the composition of calcium - alumino - silicate - hydrate (C-A-S-H) gels forming in two different systems were compared on 90 days hydrated samples analysed using X-Ray diffractometry (XRD) and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDX) respectively. The results show a rapid early strength development in limestone calcined clay cement blend (LC3) but a lower clinker hydration in comparison with slag limestone cement blend (SLSC) at later ages. In both the cement blends the formation of hemicarboaluminate (Hc) and monocarboaluminate (Mc) was confirmed at 90 days, but the conversion of Hc to Mc was higher in SLSC. Results further confirmed a lower degree of hydration and higher alumina incorporation in the C-A-S-H gel in the LC3 comparison to SLSC. The presence of calcium hydroxide was also confirmed in the SLSC blend due to the hydraulic nature of slag that supported the later age conversion of Hc to Mc as not seen in LC3.

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A Review of Principles, Analytical Methods, and Applications of SEM‐EDS in Cementitious Materials Characterization

Li,

Mao,

Yang

2024

Adv Materials Technologies

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Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM‐EDS) is an indispensable and versatile technique that provides detailed 2D spatial insights into the microstructure of heterogenous cementitious systems. To foster clear and systematic understanding of SEM‐EDS analysis in advancing research on cementitious materials, the state‐of‐the‐art principles, analytical approaches, and applications of SEM‐EDS analysis in cementitious systems are reviewed. This review aims to assist researchers in selecting the most appropriate strategy for SEM‐EDS analysis to quantify phase assemblage, elucidate environmental interactions, and investigate microstructure evolution in cementitious systems. The fundamental concepts related to equipment, signal generation, acquisition of diverse EDS data are first presented. Subsequently, various analysis approaches, including point analysis, grid analysis, and mapping analysis are discussed. This review then emphasizes the practical significance and potential value of SEM‐EDS analysis in addressing phase quantification challenges pertaining to cementitious systems. It is posited that the SEM‐EDS analysis holds the promise of becoming the characterization backbone for quantitative research on cementitious systems.

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The reaction between metakaolin and limestone and its effect in porosity refinement and mechanical properties

Cited by 225 publications

References 17 publications

Effects of sulfates on the hydration of Portland cement – A review

Effects of sulfates on the hydration of Portland cement – A review

Hydration behaviour of limestone-calcined clay and limestone-slag blends in ternary cement

A Review of Principles, Analytical Methods, and Applications of SEM‐EDS in Cementitious Materials Characterization

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