Comparison of IR Techniques for the Characterization of Construction Cement Minerals and Hydrated Products

Delgado, Ana H.; Paroli, Ralph M.; Beaudoin, J.J.

doi:10.1366/0003702963905312

Cited by 79 publications

(27 citation statements)

References 6 publications

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“…The spectrum shows a strong broad band in the 1200-800 cm -1 region. Maxima absorptions were checked at around 883, 908 and 940 cm -1 , typical for anhydrous tricalcium silicate [18,27]. Also strong absorption bands at ~ 850, 1000 and 1112 cm -1 (which is also due to the sulphates presence) are attributed to anhydrous dicalcium silicate [18].…”

Section: Influence Of Curing Timementioning

confidence: 91%

Mechanical properties of natural hydraulic lime-based mortars

Lanas

Bernal

Bello

et al. 2004

Cement and Concrete Research

269

142

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Section: Influence Of Curing Timementioning

confidence: 91%

Mechanical properties of natural hydraulic lime-based mortars

Lanas

Bernal

Bello

et al. 2004

Cement and Concrete Research

269

142

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“…Their intensities increase and their widths decrease with NS%, due to the pozzolanic action of NS, which accelerates the formation of more hydrated silicates. Also, the appeared band at 950-980 cm -1 is due to the formation of CSH [50]. The band at 1480 cm -1 is due to C-O bond stretching of CO 3 , which result from the carbonation of hydrated silicates as well as the residual Ca(OH) 2 .…”

Section: Ir Spectroscopymentioning

confidence: 97%

“…Therefore, the rate of lime consumption becomes more than that of its production. The appeared band in the range 950-985cm -1 is assigned to the formation of Tobermorite like phase (CSH) [50]. The broad band centered at about 3400 cm -1 and that at 1640-1650 cm -1 are due to stretching and bending vibration of water bound in the hydrated silicates.…”

Section: Ir Spectroscopymentioning

confidence: 98%

Chemical and Engineering Properties of Blended Cement Containing Micro- and Nano-silica

Ahmed¹,

Sabrah²,

Mohamed³

et al. 2017

AJCHE

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Nano-technology (NT) and nano-materials (NMs) has attracted considerable scientific attention, due to the new potential uses of nano-particles (NPs), which can change the concrete world. There is a great interest in replacing a long time used materials in concrete structure by NMs to improve the different properties of concrete. In this study, the hydration characteristics and microstructure of cement pastes and mortars with and without nano-silica (NS) were studied. Blended cement mix containing 10 mass, % silica fume (SF) was prepared, then the cement mix was partially replaced by NS up 1.5 mass, %. The results show that, NS increases the water of consistency and final setting time The values of chemically combined water, free lime, bulk density and compressive strength prove that, NS up to 1% seems to be an effective mineral additive for blending with OPC to improve its chemical and engineering properties. This is mainly attributed to that; NS behaves not only as filler to improve microstructure, but also as pozzolanic material (PZM). The formation of more hydrated silicates in presence of NS was confirmed by XRD, DTA, IR and SEM examinations. At 1.5 mass, % NS, the density and strength are reduced but still higher than those of 0.0 and 0.5% NS. Also, the results indicate that, the substitution of blended cement mix (OPC+10% SF) with 1 mass, % NS gives a reasonable hydration characteristics and improved engineering properties more than those of 0.0 and 0.5% NS at all hydration ages up to 90 days. Therefore, this level of NS is suggested to be the most suitable replacement level.

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“…It also absorbs this radiation in the range 3,000-3,700 cm -1 as this corresponds to the O-H stretching region. The hydroxide containing compounds also absorb in this range, such as Ca(OH) 2 at 3,643 cm -1 (Björnström 2005;Delgado et al 1996;Yu et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Carbonation of Portland Cement Studied by Diffuse Reflection Fourier Transform Infrared Spectroscopy

Ylmén

Jäglid

2013

Int J Concr Struct Mater

168

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Carbonation is a natural ageing process for cement. This study focuses on how the carbonation rate varies with selected hydration times and atmospheric conditions during the early stages of reacting dried cement paste. Diffuse reflection Fourier transform infrared spectroscopy is shown to be a suitable technique to monitor the formation of carbonates in cement. Combined with a previously developed freeze drying technique, carbonation can be studied at specific hydration stages. In ambient air both calcium hydroxide and calcium silicate hydrate (C-S-H) in cement are carbonated. Increased hydration time enhances the carbon dioxide uptake, which indicates that the calcium in the hydration products reacts more easily than the calcium in the clinker phase. In a humid CO 2 atmosphere, the carbonation process is so pronounced that it decomposes C-S-H into calcium carbonate and silica. In a moist N 2 atmosphere no carbonation occurs, but the sulfate chemistry of the cement seems to be affected due to the formation of ettringite.

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Comparison of IR Techniques for the Characterization of Construction Cement Minerals and Hydrated Products

Cited by 79 publications

References 6 publications

Mechanical properties of natural hydraulic lime-based mortars

Mechanical properties of natural hydraulic lime-based mortars

Chemical and Engineering Properties of Blended Cement Containing Micro- and Nano-silica

Carbonation of Portland Cement Studied by Diffuse Reflection Fourier Transform Infrared Spectroscopy

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