cement hydration in the presence of wood

CEMENT HYDRATION IN THE PRESENCE OF WOOD

2016-4-1  cement [5]. Wood extractives were found to adversely affect the exothermic hydration characteristics of Port-land cement, which in turn affects the wood cement compatibility [6]. The main inhibitor of cement hydration are wood fibre soluble sugars and part of hemicellulose, which under certain conditions can be resolved in these sugars [7, 8, 9].

More

Probing of wood-cement interactions during hydration of ...

Besides, another important hydration product, calcium hydroxide Ca(OH)2, requires much longer time to form in the presence of both wood flours during hydration relative to the neat cement, e.g ...

More

Towards a further understanding of cement hydration in

2020-6-1  Cement hydration is regarded as a simultaneous process including dissolution of clinkers and precipitation of hydration products [14,15] via the pore solution as the reaction medium. A good correlation of heat flow curve with the results of quantitative in-situ XRD has been built to follow cement hydration [16,17]. In addition, the pore ...

More

Hydration Process of Cement in the Presence of a ...

2005-7-7  In the cement industry, the extrusion technique is used to produce flat shapes with improved resistance to compression. Extrusion is a plastic-forming process that consists of forcing a highly viscous plastic mixture through a shaped die. The material should be fluid enough to be mixed and to pass through the die, and on the other hand, the extruded specimen should be stiff enough to be ...

More

Behaviour of ASTM Type V cement hydrated in the

ASTM Types I and V Portland cements were hydrated up to 28 days in the presence of 0.3% and 0.6% sulfonated melamine formaldehyde (SMF), at a water/cement ratio of 0.35. Hydration was studied by conduction calorimetric and thermogravimetric analyses. The amount of Ca(OH)2 produced, compressive strength and porosity were determined after 1, 3, 7 and 28 days of curing. The compressive strengths ...

More

Study on the early cement hydration process in the ...

2020-11-20  Theoretically speaking, the process of cement hydration may be influenced by cationic AE due to the incompatible between the asphalt and cement particles. Therefore, it is of great importance to investigate the properties of CA paste/mortar by understanding the early hydration behavior of cement in the presence of cationic AE.

More

Hydration of Portland Cement - Pennsylvania State

2000-3-17  Hydration of Portland Cement. The tricalcium aluminate reacts with the gypsum in the presence of water to produce ettringite and heat: Tricalcium aluminate + gypsum + water ® ettringite + heat. C3A + 3C S H2 + 26H ® C6AS3H32, D H = 207 cal/g. Ettringite consists of long crystals that are only stable in a solution with gypsum.

More

Hydration of Cement in the Presence of SBR Dispersion

Hydration of cement in the presence of SBR dispersion and powder respectively was investigated using the methods of ITC, XRD and ESEM. The results show that both the dispersion and powder of SBR facilitate the formation, enhance the stability of AFt and inhibit the formation of C4AH13 in cement paste; the effect of the powder is more evident than the dispersion.

More

Wood-cement composites: a review SpringerLink

2004-7-31  The term compatibility, when applied in the research area of wood-cement composites, refers to the degree of cement setting after mixing with water and with a given wood in a fragmented form.In general terms, if the chemical process of cement hardening is undisturbed, or disturbed just in a low extent, by the presence of wood it is said that this cement and this wood are compatible; on the ...

More

Effect of different sulphate carriers on Portland cement ...

2021-8-2  Hence, the question arises how different types of sulphate carriers influence cement hydration in the presence of TEA, which has attracted only limited attention until now. Recchi et al. [38] examined the workability and compressive strength of mortars with different amounts and types of sulphate carriers with and without the addition of TEA.

More

Effects of Two Types of Waste Wood Species on the ...

Besides, another important hydration product, calcium hydroxide Ca(OH) 2, requires much longer time to form in the presence of both wood flours during hydration relative to the neat cement, e.g. nearly double time for the poplar-filled cement system. The findings provide useful information for extending the potential application of wood flours ...

More

What are the Products of Cement Hydration? [PDF] - The ...

🕑 Reading time: 1 minute The chemical reaction which takes place between cement and water is known as hydration of cement. This reaction is exothermic in nature, which means heat is released during the reaction, and the evolved heat is called as heat of hydration.. Typically, cement produces 89-90cal/gm of heat in 7 days and 90-100cal/gm in 28 days.

More

(PDF) Hydration performance of cement-bonded wood ...

The presence of inhibitory substances such as starches, sugars, hemicelluloses and extractives in wood are known to affect and influence cement curing / setting time. The hydration heat ...

More

Probing of wood-cement interactions during hydration of ...

Besides, another important hydration product, calcium hydroxide Ca(OH)2, requires much longer time to form in the presence of both wood flours during hydration relative to the neat cement, e.g ...

More

Hydration behavior of wood cement-based composite I ...

2000-8-1  As an essential preliminary evaluation for understanding the hydration behavior of wood-cement-water mixtures, an isothermal calorimetry and experimental method were used to measure the hydration heat of woodcement-water mixtures. The compatibility of 38 wood species with ordinary portland cement was studied using this procedure. Based on the results, all the wood species tested

More

Behaviour of ASTM Type V cement hydrated in the

ASTM Types I and V Portland cements were hydrated up to 28 days in the presence of 0.3% and 0.6% sulfonated melamine formaldehyde (SMF), at a water/cement ratio of 0.35. Hydration was studied by conduction calorimetric and thermogravimetric analyses. The amount of Ca(OH)2 produced, compressive strength and porosity were determined after 1, 3, 7 and 28 days of curing. The compressive strengths ...

More

Cement Hydration In The Presence Of High Filler Contents

Cement Hydration In The Presence Of High Filler Contents. To realize self-compacting concrete, high filler contents are often used, and in order to avoid problems with excessive heat development during hardening, inert filler materials can be used. In this research two different filler types, limestone and quartzite, are considered in ...

More

Hydration of Portland Cement in the Presence of Highly ...

2015-5-15  TU 5729-097-12615988-2013, Russia) introduced into Portland cement paste at various dosages, as well as its influence on the kinetics of Portland cement hydration and the formation of hydration products by means of 27Al -and 29Si MAS NMR spectroscopy. 2. Experimental 2.1. Materials According to the manufacturer, the content of Al 2O 3 and SiO

More

Hydration of Portland Cement - Pennsylvania State

2000-3-17  Hydration of Portland Cement. The tricalcium aluminate reacts with the gypsum in the presence of water to produce ettringite and heat: Tricalcium aluminate + gypsum + water ® ettringite + heat. C3A + 3C S H2 + 26H ® C6AS3H32, D H = 207 cal/g. Ettringite consists of long crystals that are only stable in a solution with gypsum.

More

Portland cement hydration in the presence of admixtures ...

The heat flow as a function of time during the hydration of cement in the absence and presence of 2.0 wt. (%) BGP and SP are shown in Figure 2.In the case of reference, the curve is divided into five parts: 1) rapid heat evolution due to cement wetting, dissolution of alkalis, dissolution of hemihydrates and hydration of C 3 A and its reaction with gypsum 2) induction period where the ...

More

Hydration of Cement in the Presence of SBR Dispersion

Hydration of cement in the presence of SBR dispersion and powder respectively was investigated using the methods of ITC, XRD and ESEM. The results show that both the dispersion and powder of SBR facilitate the formation, enhance the stability of AFt and inhibit the formation of C4AH13 in cement paste; the effect of the powder is more evident than the dispersion.

More

Cement Hydration in the Presence of Nano Magnesium

2018-9-25  Jafariesfad, N, Skalle, P, Geiker, MR. "Cement Hydration in the Presence of Nano Magnesium Oxides With Controlled Reactivity." Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology. Madrid, Spain. June 17–22, 2018 ...

More

(PDF) The Influence of Wood Extractives and Additives on ...

The experiment was carried out to study the effect of wood extractives, chamotte and CaCl2 on hydration and hardening of cement paste. It also allowed study of the effects of these additives on ...

More

Hydration study of ordinary portland cement in ... - SciELO

The significant retardation of early cement hydration in the presence of zinc is assessed in detail by differential calorimetry as a complement to the study carried out by IR and XRD, providing evidence that permits to evaluate the kinetic of the early hydration. Keywords: Portland cement, infrared spectroscopy, X ray diffraction, zinc. 1 ...

More

Hydration behavior and compressive strength of cement ...

Poor compatibility was found between exploded wood fiber strand (WFS) and cement due to the excessive presence of water-soluble degraded polysaccharides in extractives of exploded WFS obtained from weathered wood waste treated by the water-vapor explosion process (WVEP). This study presents some comparative results from a continuing investigation on the compressive strengths of exploded

More

Hydration behavior of wood cement-based composite I ...

2000-8-1  As an essential preliminary evaluation for understanding the hydration behavior of wood-cement-water mixtures, an isothermal calorimetry and experimental method were used to measure the hydration heat of woodcement-water mixtures. The compatibility of 38 wood species with ordinary portland cement was studied using this procedure. Based on the results, all the wood species tested

More

EFFECTS OF KENAF BAST FIBRES ON HYDRATION

2014-7-23  bonded composites is the effect of wood on the hydration (setting) rate of the ordinary Portland cement (OPC) (Yi et al. 2000, Jorge et al. 2004). The problem of compatibility between cement and wood arises due to the presence of wood extractives, especially sugars, which appear to inhibit the setting of cement (Wei 2002). Wood

More

Hydration of tricalcium silicate in the presence of ...

2018-9-9  The early age-hydration of tricalcium silicate, the main chemical compound in Portland cement, was studied in the presence of synthetic calcium silicate hydrate (C–S–H) addition having C/S ratios = 0.8 and 1.2. Isothermal conduction calorimetry,

More

Cement Hydration in the Presence of Municipal Solid

1998-3-1  The hydration products formed in a cement paste in the presence of MSWIFA were also studied. X-ray diffractometry was performed on the pure cement paste and on the cement pastes containing MSWIFA. The comparison of the diffractograms obtained has allowed us to identify the main hydrates formed due to the presence of MSWIFA.

More

Cement Hydration In The Presence Of High Filler Contents

Cement Hydration In The Presence Of High Filler Contents. To realize self-compacting concrete, high filler contents are often used, and in order to avoid problems with excessive heat development during hardening, inert filler materials can be used. In this research two different filler types, limestone and quartzite, are considered in ...

More

Portland cement hydration in the presence of admixtures ...

The heat flow as a function of time during the hydration of cement in the absence and presence of 2.0 wt. (%) BGP and SP are shown in Figure 2.In the case of reference, the curve is divided into five parts: 1) rapid heat evolution due to cement wetting, dissolution of alkalis, dissolution of hemihydrates and hydration of C 3 A and its reaction with gypsum 2) induction period where the ...

More

Hydration of Portland Cement in the Presence of Highly ...

2015-5-15  TU 5729-097-12615988-2013, Russia) introduced into Portland cement paste at various dosages, as well as its influence on the kinetics of Portland cement hydration and the formation of hydration products by means of 27Al -and 29Si MAS NMR spectroscopy. 2. Experimental 2.1. Materials According to the manufacturer, the content of Al 2O 3 and SiO

More

Hydration study of ordinary portland cement in ... - SciELO

The significant retardation of early cement hydration in the presence of zinc is assessed in detail by differential calorimetry as a complement to the study carried out by IR and XRD, providing evidence that permits to evaluate the kinetic of the early hydration. Keywords: Portland cement, infrared spectroscopy, X ray diffraction, zinc. 1 ...

More

Cement Hydration in the Presence of Nano Magnesium

2018-9-25  Jafariesfad, N, Skalle, P, Geiker, MR. "Cement Hydration in the Presence of Nano Magnesium Oxides With Controlled Reactivity." Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology. Madrid, Spain. June 17–22, 2018 ...

More

Hydration of Ordinary Portland Cement in Presence of

Lead, as well as other heavy metals, is known as retarder of the hydration process of Ordinary Portland Cement (OPC), used for the immobilization. In this paper, influence of sorbed Pb and PbO, as reference compound, on cement hydration was studied by calorimetry, thermogravimetry and Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy ...

More

EFFECTS OF KENAF BAST FIBRES ON HYDRATION

bonded composites is the effect of wood on the hydration (setting) rate of the ordinary Portland cement (OPC) (Yi et al. 2000, Jorge et al. 2004). The problem of compatibility between cement and wood arises due to the presence of wood extractives, especially sugars, which appear to inhibit the setting of cement (Wei 2002) . Wood

More