Recent advances in the field of cement hydration and microstructure analysis

Stark, Jochen

doi:10.1016/j.cemconres.2011.03.028

Cited by 166 publications

(79 citation statements)

References 532 publications

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“…Many researchers have demonstrated the benefits that are associated with the addition of natural and industrial by-products such as pozzolans in substitution of binary cement matrices Stark, 2011;Taylor, 1997). Thus, Mehta (2002) reported that blended Portland cements, containing 10-30% Santorin earth, are of a similar or higher compressive strength than the reference Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Fly ash/paper sludge as constituents of cements: hydration phases

GiménezRosario¹,

VillaRaquel²,

GoñiSara³

et al. 2015

Journal of Environmental Engineering and Science

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Ternary cements prepared with equal amounts of thermally activated paper sludge and fly ash in proportions of 35% and 50%, in substitution of ordinary Portland cement, are mixed to study their phase stability. The underlying intention is to increase the proportional substitution of waste products in these types of cement, thereby consigning less waste to landfill sites. The hydration phases of the cement specimens were analysed using thermogravimetric/derivative thermogravimetric (TG/DTG) analysis, X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) spectroscopy. The phases identified in the cement blends include Portlandite, monocarboaluminate compounds (C 4 AC -H 12 ), and layered double hydroxides-type compounds (LDH), as well as ettringite and calcium silicate hydrate gels.Increased formation of both tetracalcium aluminate carbonate 12 hydrate (C 4 ACH 12 ) and LDH-type compounds and reductions in ettringite and portlandite were observed when the proportional substitution of cement by waste products rose from 35% to 50%. A characteristic compound of pozzolanic reactions, bicalcium silicate (C 2 ASH 8 ), was not observed, suggesting that it is inhibited in these types of substitutions.

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Section: Introductionmentioning

confidence: 99%

Fly ash/paper sludge as constituents of cements: hydration phases

GiménezRosario¹,

VillaRaquel²,

GoñiSara³

et al. 2015

Journal of Environmental Engineering and Science

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“…The porosity of the pastes typically increases with the water cement ratio. The water enclosed in the microstructure is directly responsible for the porosity of the hardened cement pastes [40].…”

Section: Bulk Density and Total Porositymentioning

confidence: 99%

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Saraya¹,

Bakr²

2015

MSCE

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The aim of the present work is to study the effect of Nano-barium sulfate additions on the physicomechanical properties of hardened cement pastes. Nano-barium sulfate was prepared by the precipitation method. Eight mixes of filled cement pastes containing 0.5 wt%, 1.0 wt%, 1.5 wt% and 2.0 wt% of both nano-barium sulfate and micro-limestone were prepared and compared to the base OPC. The hydration characteristics were evaluated by the measure of combined water content, bulk density, total porosity and compressive strength for samples hydrated up to 90 days. The progress of hydration reactions was followed up by XRD analysis. The morphology and microstructure were studied by SEM. Nano-size barium sulfate acted as a nucleating agent and enhanced the hydration of cement pastes up to 2.0% mass content. Also, the microstructure was improved considerably. Accordingly, nano-size barium sulfate can be used successfully in the preparation of filled cement.

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“…The modification with redispersible polymer powders is similar to that of latex formation except that it also involves the redispersion of the polymer powders [8][9][10][11][12][13][14][15] . In these cases, the modification is governed by both Portland cement hydration and polymer film formation processes in their binder phase [16][17][18][19][20][21][22] . The cement hydration process generally precedes the polymer film formation by coalescence of polymer particle.…”

Section: Polymer Additionmentioning

confidence: 99%

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

Gomes

Savastano

2013

Mat. Res.

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Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some properties of asbestos-free fiber cement composites were studied, such as density, porosity and loss or absorption of water. For the understanding of the behavior of this material, modifiers were employed in the cement matrix such as styrene-acrylic, styrene-butadiene and vinyl acetate-versatic vinylester copolymers to verify their influence on the variables described above. All composites were analyzed by mercury intrusion porosimetry (MIP). For monitoring the expansion/shrinkage movements, the specimens were exposed inside a controlled environmental chamber with constant temperature and relative humidity (RH) during the test time. The results showed no interference on hygral behavior because particular casting process of these composites but, as showed by literature, increase of toughness. Also, it was possible to verify that moisture movement within the asbestos-free fiber cement can be very complex and the variables density and porosity (pore structure) play a very important role in the expansion/shrinkage properties of these composites.

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Recent advances in the field of cement hydration and microstructure analysis

Cited by 166 publications

References 532 publications

Fly ash/paper sludge as constituents of cements: hydration phases

Fly ash/paper sludge as constituents of cements: hydration phases

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

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