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

Dong, Zhiqiang; Yu, Youming; Song, Pingan; Ma, Li; Lu, Fengzhu

doi:10.3151/jact.14.13

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…This result supports the more significant suppressing effect when chlorella is introduced in cement as compared to spirulina. A similar effect of wood flour in Portland cement at 7.5 wt % (wood flour/dry cement) was reported by Dong et al 73 They showed that the wood with high content of sugar and sugar acid (poplar wood) inhibits the hydration process more than the Chinese fir (lower content of sugar and sugar acid). However, they reported that ettringite generation was not negatively affected by the presence of wood flour in either case, which agrees with our findings.…”

Section: ■ Results and Discussionsupporting

confidence: 76%

Long-Term Hindrance Effects of Algal Biomatter on the Hydration Reactions of Ordinary Portland Cement

Lin

Grandgeorge

Jimenez

et al. 2023

ACS Sustainable Chem. Eng.

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The incorporation of carbon-fixing materials such as photosynthetic algae in concrete formulations offers a promising strategy toward mitigating the concerningly high carbon footprint of cement. Prior literature suggests that the introduction of up to 0.5 wt % chlorella biological matter (biomatter) in ordinary Portland cement induces a retardation of the composite cement’s strength evolution while enabling a long-term compressive strength comparable to pure cement at a lower carbon footprint. In this work, we provide insights into the fundamental mechanisms governing this retardation effect and reveal a concentration threshold above which the presence of biomatter completely hinders the hydration reactions. We incorporate Chlorella or Spirulina, two algal species with different morphology and composition, in ordinary Portland cement at concentrations ranging between 0.5 and 15 wt % and study the evolution of mechanical properties of the resulting biocomposites over a period of 91 days. The compressive strength in both sets of biocomposites exhibits a concentration-dependent long-term drastic reduction, which plateaus at 5 wt % biomatter content. At and above 5 wt %, all biocomposites show a strength reduction of more than 80% after 91 days of curing compared to pure cement, indicating a permanent hindrance effect on hardening. Characterization of the hydration kinetics and the cured materials shows that both algal biomatters hinder the hydration reactions of calcium silicates, preventing the formation of calcium hydroxide and calcium silicate hydrate, while the secondary reactions of tricalcium aluminate that form ettringite are not affected. We propose that the alkaline conditions during cement hydration lead to the formation of charged glucose-based carbohydrates, which subsequently create a hydrogen bonding network that ultimately encapsulates calcium silicates. This encapsulation prevents the formation of primary hydrate products and thus blocks the hardening of cement. Furthermore, we observe new hydration products with composition and micromorphology deviating from the expected hardened cement compounds. Our analysis provides fundamental insights into the mechanisms that govern the introduction of two carbon-negative algal species as fillers in cement, which are crucial for enabling strategies to overcome the detrimental effects that those fillers have on the mechanical properties of cement.

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Section: ■ Results and Discussionsupporting

confidence: 76%

Long-Term Hindrance Effects of Algal Biomatter on the Hydration Reactions of Ordinary Portland Cement

Lin

Grandgeorge

Jimenez

et al. 2023

ACS Sustainable Chem. Eng.

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“…Chinese fir particles for the production of CBPB were adjusted to a moisture content (MC) of 12±1.0% in an oven (DKN611, Yamato Company, Japan) at the temperature of 103±2°C. Portland cement applied in this study was produced by Shanggan cement plant of Lin'an, Zhejiang Province, China, with its chemical compositions and mineral compositions cited by Wang et al (2012), and Dong et al (2016). CaCl 2 , purchased from Hangzhou Gaojing Fine Chemical Co., Ltd, Hangzhou, China, was used as the cement curing accelerator.…”

Section: Methodsmentioning

confidence: 99%

Probing the Effects of Density on Combustion Performance of Cement-bonded Particleboard Produced from Wood Processing Residues

Hou

Wang

Jiang

et al. 2021

ACT

Self Cite

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The purpose of this study was to provide insights into deeper understanding of the combustion performance of cement-bonded particleboards. Cement-bonded particleboard produced from Chinese fir processing residues is fabricated and its combustion performance is further evaluated by cone calorimeter analysis. Obtained results revealed that combustion performance of cement-bonded particleboard positively depends on the density of which, and higher density imparts corresponding particleboards reduction in heat release rate, total heat release, and mass loss rate, along with elevated time to ignition. With the density of particleboard increasing from 0.7 to 1.0 g/cm 3 , peak and average heat release rate, total heat release and average mass loss rate of specimens were decreased by 55.9, 73.4, 77.8 and 60.3%, respectively. Furthermore, time to ignition of particleboard increased by more than 20 times as the density increasing. Residual mass of specimens was also remarkably elevated along with higher yields of CO and CO 2 as the density of particleboard increasing. We believe that proposed investigation is beneficial for the value-added utilization of wood processing residues and further developing products fabricated by wood processing residues.

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“…For the production of wood-cement composites such woodworking wastes and organic components as straw, nutshell, sludge, foam, various wastes, etc are used [13][14][15][16][17][18][19][20][21]. Portland cement is used as astringent but the following additives as accelerators and plasticizers are allowed [22].…”

Section: Introductionmentioning

confidence: 99%

About the Possibility of Recycling Water Treatment Sludge in the Wood–Cement Composites Production

Sapronova

Свергузова

Svyatchenko

2020

SSP

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The paper presents the results of a study of the possibility of recycling water treatment sludge in the production of wood-cement composites. Sludge is formed during the treatment of sewage, containing industrial machine oil, with a sorption material, based on thermally modified chestnut tree waste (CTW). It was found that the addition of sludge leads to an increase in the density of the samples. Thus, the samples without the addition of sludge have an average density of 860 kg/m3, samples with the addition of sludge in an amount of 10 mass% - 875 kg/m3, 20 mass% - 879 kg/m3, 30 mass% - 882 kg/m3, 42 mass % - 887 kg/m3. Studies of the change in water absorption of samples, depending on the amount of sludge added, showed that the values slightly decrease for samples containing sludge, what is explained by the presence of oil in the mixture. The compressive strength of the samples with the addition of sludge in the amount of 42 mass% was 3.1 MPa, what corresponds to the regulatory requirements for a wood cement composites.

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

Cited by 8 publications

References 24 publications

Long-Term Hindrance Effects of Algal Biomatter on the Hydration Reactions of Ordinary Portland Cement

Long-Term Hindrance Effects of Algal Biomatter on the Hydration Reactions of Ordinary Portland Cement

Probing the Effects of Density on Combustion Performance of Cement-bonded Particleboard Produced from Wood Processing Residues

About the Possibility of Recycling Water Treatment Sludge in the Wood–Cement Composites Production

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