Study of hydration behavior of wood cement-based composite II: effect of chemical additives on the hydration characteristics and strengths of wood-cement composites

2000 ◽  
Vol 46 (6) ◽  
pp. 444-451 ◽  
Author(s):  
Yi Min Wei ◽  
Yia Guang Zhou ◽  
Bunichiro Tomita
Keyword(s):  
Cement Composites ◽  
Chemical Additives ◽  
Hydration Characteristics ◽  
Wood Cement Composites

scholarly journals PAINÉIS CIMENTO-MADEIRA DE Eucalyptus saligna COM DIFERENTES ADITIVOS QUÍMICOS E MÉTODOS DE FORMAÇÃO

FLORESTA ◽  
2014 ◽  
Vol 45 (2) ◽  
pp. 349 ◽  
Author(s):  
Vinicius Gomes Castro ◽  
Rafael Leite Braz ◽  
Rafael Rosa Azambuja ◽  
Pedro Lício Loiola ◽  
Setsuo Iwakiri ◽  
...  
Keyword(s):  
Portland Cement ◽  
Physical And Mechanical Properties ◽  
Dry Weight ◽  
Cement Composites ◽  
Type Ii ◽  
Cement Type ◽  
Chemical Additives ◽  
Eucalyptus Saligna ◽  
Cold Press ◽  
Wood Cement Composites

Este trabalho teve como objetivo avaliar o potencial de uso de diferentes aditivos químicos e métodos de formação na produção de compósitos cimento-madeira com clone de Eucalyptus saligna. Utilizou-se o cimento Portland tipo CP II-Z, como aglutinante mineral, e cloreto de cálcio (CaCl2) e cloreto de magnésio (MgCl2),como aceleradores de cura do cimento. Os painéis cimento-madeira foram produzidos pelo método de prensagem na prensa de pratos de 50,5 x 38,5 x1,5 cm, e pelo método de adensamento por vibrocompactação em dimensões de 35 x 7 x1,5 cm. Os painéis foram formados com densidade nominal de 1 g/cm³ e relação cimento:madeira de 2,75:1. Com base nos resultados, pode-se concluir que: (I) os testes de hidratação mostraram que a madeira é compatível com o cimento Portland tipo II; (II) o uso de cloreto de cálcio e de magnésio na proporção de 3% em relação à massa do cimento proporcionou incremento nas propriedades físicas e mecânicas dos painéis produzidos pelos dois métodos de formação avaliados; (III) os painéis produzidos pelo método de adensamento por vibrocompactação apresentaram menor densidade média, maior estabilidade dimensional e melhor tração perpendicular do que os painéis produzidos pelo método tradicional de prensa de pratos.Palavras-chave: Compósito cimento-madeira; vibro compactação; aceleradores de cura. AbstractWood-cement boards of Eucalyptus saligna with different chemical additives and methods of formation. The aim of this work was evaluate the potential use of different chemical additives and methods of formation for wood-cement composites with Eucalyptus saligna clones. Portland cement type II-Z was used as mineral bonding and Calcium chloride (CaCl2) and Magnesium chloride (MgCl2) as accelerator of the cement hydration. The wood-cement panels were produced by the cold press method with dimensions of 50.5 x 38.5 x1.5 cm, and by vibro-compaction densification with 35 x 7 x 1.5 cm. Both methods used a nominal density of 1.0 g/cm3 and wood: cement ratio of 1:2.75. Main results: (I) Hydration tests showed that E. saligna wood is compatible with Portland cement type II; (II) Use of Calcium and magnesium chlorides at 3% in relation of the cement dry weight improve physical and mechanical properties of wood-cement composites produced by studied methods; (III) Composites produced by vibro-compaction densification presented lower density, higher dimensional stability and higher internal bond than composites produced by the traditional cold press method.Keywords: Cement-wood composites; vibro-compaction; chemical accelerators.

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

2020 ◽  
Vol 299 ◽  
pp. 305-310
Author(s):  
Zh.A. Sapronova ◽  
S.V. Sverguzova ◽  
A.V. Svyatchenko
Keyword(s):  
Compressive Strength ◽  
Water Treatment ◽  
Water Absorption ◽  
Average Density ◽  
Cement Composites ◽  
Water Treatment Sludge ◽  
Regulatory Requirements ◽  
Sorption Material ◽  
Industrial Machine ◽  
Wood Cement Composites

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.

scholarly journals Suitability of sawdust from three tropical timbers for wood-cement composites

2018 ◽  
Vol 37 (4) ◽  
pp. 414-428 ◽  
Author(s):  
Charles Antwi-Boasiako ◽  
Linda Ofosuhene ◽  
Kwadwo B. Boadu
Keyword(s):  
Cement Composites ◽  
Wood Cement Composites

The study of strength of wood-cement composites based on waste wood

2015 ◽  
Vol 5 (3) ◽  
pp. 191-199
Author(s):  
Филичкина ◽  
Maria FilichkinaM ◽  
Копарев ◽  
Vladimir Koparev
Keyword(s):  
Cement Composite ◽  
Strength Properties ◽  
Material Strength ◽  
Cement Composites ◽  
Compression Method ◽  
Waste Wood ◽  
Good Range ◽  
Wood Cement Composites ◽  
Construction Product

The article presents the results of studies on the production of wood-cement composite with various fillers, such as sawdust, gravel, bark and shavings, the binder acts as a cement. The developed technology allows producing the construction product with a good range of strength properties depending on the product. In the work carried out tests of samples on the strength of a compression method on the equipment VSFEU. The result of testing the strength of steel obtained dependence of material strength on the fraction of components in the mixture components, which then led to the conclusion that the strength limits varied from 0.38 MPa to 2.72 MPa.

A Study of Ordinary Portland Cement Hydration With Wood by Isothermal Calorimetry

Holzforschung ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 104-108 ◽  
Author(s):  
N. Sauvat ◽  
R. Sell ◽  
E. Mougel ◽  
A. Zoulalian
Keyword(s):  
Portland Cement ◽  
Calcium Chloride ◽  
Activated Charcoal ◽  
Ordinary Portland Cement ◽  
Cement Hydration ◽  
Isothermal Calorimetry ◽  
Cement Composites ◽  
Total Enthalpy ◽  
Portland Cement Hydration ◽  
Wood Cement Composites

Summary As an essential preliminary to understand the hydration of wood-cement composites, the effects of some additives on the delayed setting due to wood of an Ordinary Portland Cement have been investigated by isothermal calorimetry. With the addition of calcium chloride and activated charcoal, an increase of 50% of the total enthalpy is observed in wood-cement composites hydration, because calcium chloride mostly influences aluminate phases and activated charcoal silicate phases.

scholarly journals Enhanced Resistance to Fire of the Bark-Based Panels Bonded with Clay

2020 ◽  
Vol 10 (16) ◽  
pp. 5594 ◽  
Author(s):  
Eugenia Mariana Tudor ◽  
Christoph Scheriau ◽  
Marius Catalin Barbu ◽  
Roman Réh ◽  
Ľuboš Krišťák ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fire Resistance ◽  
Fire Retardant ◽  
Wood Particle ◽  
Cement Composites ◽  
Insulation Material ◽  
Enhanced Resistance ◽  
Ventilation Rates ◽  
Indoor Spaces ◽  
Wood Cement Composites

The aim of this study was to investigate the flammability of ecologically friendly, 100% natural larch and poplar bark-based panels bonded with clay. The clay acted as a fire retardant, and it improved the fire resistance of the boards by 12–15% for the surface and 27–39% for the edge of the testing specimens. The thermal conductivity was also analyzed. Although the panels had a density ranging from 600 to 900 kg/m3, thermal conductivity for the panel with a density of 600 kg/m3 was excellent, and it was comparable to lightweight insulation panels with much lower densities. Besides that, the advantage of the bark clay boards, as an insulation material, is mostly in an accumulative capacity similar to wood cement boards, and it can significantly improve the climatic stability of indoor spaces that have low ventilation rates. Bark boards with clay, similar to wood cement composites (wood wool cement composites and wood particle cement composites), have low mechanical properties and elasticity. Therefore, there their use is limited to non-structural paneling applications. These ecologically friendly, 100% natural and recyclable composites can be mostly used with respect to their thermal insulation, acoustics and fire resistance properties.

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