The Influence of Wood Extractives and Additives on the Hydration Kinetics of Cement Paste and Cement-bonded Particleboard

Nazerian, Morteza; Gozali, Ebrahim; Dahmardeh, Mohammad

doi:10.3923/jas.2011.2186.2192

Cited by 23 publications

(14 citation statements)

References 8 publications

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“…It is widely accepted that wood materials do not react with cement (Hachmi et al 1990) and different wood species hold different components and contents, thus resulting in significantly different effects in inhibiting the formation of hydration products (Fan et al 2012). Moreover, the complex chemical and physical interactions between wood and cement components also have a significant influence on the property of the wood-cement composites (Nazerian et al 2011). Therefore, it is rather necessary to clarify how wood species affect the hydration of the cement system.…”

Section: Introductionmentioning

confidence: 99%

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

Dong

Song

et al. 2016

ACT

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Despite much work on wood-cement composites, effects of wood species on the hydration of cements remain unclear until now. Thus, we herein investigated systematically effects of two typical wood species wastes on the hydration of Portland cement in this work. It was found that adding the poplar flour prominently affects the formation of the calcium silicate hydrate gel (C-S-H gel) delaying the hydration process, while the Chinese fir flour hardly retards the process due to different components. Compared with the neat cement, addition of both wood flours makes it easier to generate the ettringite. 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 waste in cement composites.

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Section: Introductionmentioning

confidence: 99%

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

Dong

Song

et al. 2016

ACT

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“…Also, the positive side effect of using the additives is the fact that the possibility to wash out aggressive extractives from the wooden particles and therefore mechanical properties are increased (Eusebio et al 2000, Frybort et al 2008. Nazerian et al (2011) argued that impermeable hydrates are formed around unhydrated cement grains when extractives are present and therefore the need to remove them. …”

Section: Influence Of Pinus Residues and Pretreatments On The Composimentioning

confidence: 99%

“…Nazerian et al (2011) reported that the additives such as chlorides could be used effectively as accelerators to restrain the inhibitory influence of wood species. Different letters denote the statistical difference between the averages in columns at P-value < 0.05; CV: coefficient of variation; CPV, ARI, and RS: Standard Portland cement mortar; PN: untreated Pinus residues (without pretreatment); AF-24H, AF-48H, and AF-72H: cold water extraction for 24 h, 48 h, and 72 h, respectively; AQ-1H, AQ-2H, and AQ-3H: hot water extraction for 1 h, 2 h, and 3 h, respectively; NaOH-1%, NaOH-3%, and NaOH-5%: extraction in sodium hydroxide solutions at a concentration of 1%, 3%, and 5%, respectively; Ca(OH)2-5%, Ca(OH)2-7%, and Ca(OH)2-10%: extraction in calcium hydroxide solutions at concentrations of 1%, 3%, and 5%, respectively.…”

Section: Influence Of Pretreatments On the Hydration Of Portland Cementmentioning

confidence: 99%

Study of the Interaction of Portland Cement and Pinus Wood for Composites using Bragg Sensors in Optical Fibers

2015

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The potential usage of Pinus wood residues in cement-wood composites and the behavior of CaCl2•2H2O, used as an additive were assessed in this work. In order to improve the interaction between the cement-wood composites, CaCl2•2H2O and 12 different pre-treatment types were tested. Pre-treatments involved extractions in cold and hot water, NaOH solutions, and several Ca(OH)2 concentrations for different times. An evaluation of the mechanical features (compressive strength and tensile resistances) of composites was also performed using 50 mm cylindrical samples. The interaction of the composites was analyzed using Bragg sensors in optical fibers. Pinus residues were tested having particle size of 4.8 mm and a CaCl2•2H2O content between 0% and 8%. The highest compressive strength was observed for the production of composites with 4.5% CaCl2•2H2O and the hot and cold water pre-treatment. Conversely, for tensile strength, the highest performance occurred when NaOH was used as a pre-treatment. The technology for determining the temperature of composites using Bragg sensors in optical fibers was judged to be efficient.

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“…For all the CBCB specimens, the water to cement ratio was maintained at 0.5. After 15 min of manual mixing (Nazerian et al 2011), the cement-wood water mixture was uniformly spread in a wooden mold. Nine types of panels were produced under laboratory conditions (Table 1).…”

Section: Production Of Cement-bonded Composite Boardsmentioning

confidence: 99%

“…In addition, hemicellulose, starch, sugar, tannins, and lignin, each to a varying degree, affect the cure rate and ultimate strength of these composites (Nazerian et al 2011). The compatibility between wood particles and cement can be enhanced by the incorporation of chemical additives (Wei and Tomita 2001;Okino et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Technological Properties of Cement-Bonded Composite Board Produced with the Main Veins of Oil Palm (Elaeis guineensis) Particles

Ayrılmış¹,

Hosseinihashemi²,

Karimi³

et al. 2017

BioResources

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The effects of main veins of palm (Elaeis guineensis) particles and the amount of CaCl2 on the mechanical and physical properties of cementbonded composite boards (CBCBs) were investigated in this study. Homogenous CBCBs were produced with main veins palm particles content at three levels of 10, 15, or 20 wt.% and CaCl2 at three levels of 0, 3, or 6 wt.%. Other manufacturing parameters consisting of pressure and time for cold-press, material dry weight, and panel dimensions were kept constant. The flexural strength, flexural modulus, internal bonding, water absorption, thickness swelling, and the thickness of CBCBs after 2 and 24 h immersion in distilled water were determined. The results indicated that increased amount of lignocellulosic particles caused a decrease in the mechanical properties of the CBCBs. The increase in calcium chloride up to 6 wt.% improved mechanical properties of the CBCBs. The panels manufactured with 10 wt.% E. guineensis particles and 6 wt.% CaCl2 showed the most favorable physical and mechanical properties.

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The Influence of Wood Extractives and Additives on the Hydration Kinetics of Cement Paste and Cement-bonded Particleboard

Cited by 23 publications

References 8 publications

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

Effects of Two Types of Waste Wood Species on the Hydration Characteristic of Portland Cement

Study of the Interaction of Portland Cement and Pinus Wood for Composites using Bragg Sensors in Optical Fibers

Technological Properties of Cement-Bonded Composite Board Produced with the Main Veins of Oil Palm (Elaeis guineensis) Particles

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