CEMENT COMPOSITES REINFORCED WITH TEOS-TREATED WOOD FIBRES

In this study, wood fibres were extracted from eucalyptus and pine woods, treated by immersion in tetraethyl orthosilicate (TEOS) and incorporated into a cementitious matrix at three weight contents (2 wt%, 5 wt% and 10 wt%). The fibres were characterized using chemical and morphological analyses and the cement-based composites were evaluated using chemical, hygroscopic, mechanical and morphological tests. The morphological and spectroscopic results satisfactorily justified the physical-mechanical properties. The wood fibre-cement composites reached similar water uptake and apparent porosity to those of the neat mortar, but exhibited higher mechanical properties. Furthermore, all treated fibres yielded composites with improved mechanical and hygroscopic properties compared to those with pristine fibres. Overall, the best performance (based on hygroscopic and mechanical results) was obtained for the wood fibre-cement composite with 2 wt% pine fibres.

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Wood fibre - cement composites by extrusion

Canadian Journal of Civil Engineering ◽

10.1139/l99-093 ◽

2000 ◽

Vol 27 (3) ◽

pp. 543-552 ◽

Cited By ~ 10

Author(s):

Yixin Shao ◽

Shylesh Moras ◽

Nilgun Ulkem ◽

George Kubes

Keyword(s):

Cement Composite ◽

Temperature Cycling ◽

Wood Fibre ◽

Flexural Behavior ◽

Cement Composites ◽

Building Product ◽

Toughness Index ◽

Composites Materials ◽

Fibre Cement ◽

Hardwood Pulp

Wood fibres derived from both hardwood and softwood, being relatively inexpensive and in ample supply, have gained increasing popularity in the fibre-cement building product industry. Presently, the manufacture of most wood fibre - cement composites employs the Hatschek process. The purpose of this paper is to examine the feasibility of using extrusion technology for the production. Wood fibre - cement sheets, composed of both hardwood and softwood fibres of different fibre contents, were fabricated using an auger-type extruder. The flexural behavior, moisture content, water absorption, and density of all batches were evaluated. To investigate the weathering durability of the extruded composites, materials were also subjected to a temperature-cycling test and a natural exposure weathering test. With a relative ease of manufacture and a much cleaner production, extrusion was found to be a suitable means for making cement composite thin sheets with up to 8% fibres by weight. The extruded composites exhibited a performance comparable to or even better than that of the Hatschek products. Hardwood fibres, which are cheaper and more available than the softwood fibres, were found to be more suitable for extrusion production in terms of the extrudability, finished surface, and long-term mechanical properties.Key words: wood fibre - cement composites, hardwood pulp, softwood pulp, extrusion, strength, toughness index, temperature cycling, natural weathering.

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On durability and mechanical properties improvement of a compacted copper-fibre cement composite subjected to general corrosion

Cement and Concrete Research ◽

10.1016/0008-8846(88)90046-4 ◽

1988 ◽

Vol 18 (4) ◽

pp. 539-544 ◽

Cited By ~ 1

Author(s):

P. Kittl ◽

R. Perret ◽

N. Alvarez ◽

G. Díaz

Keyword(s):

Mechanical Properties ◽

Cement Composite ◽

General Corrosion ◽

Fibre Cement ◽

Fibre Cement Composite

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Experimental investigation of wood fibre cement composite wall panel under axial loading

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/78/1/012037 ◽

2015 ◽

Vol 78 ◽

pp. 012037

Author(s):

Mst Sadia Mahzabin ◽

Roszilah Hamid

Keyword(s):

Experimental Investigation ◽

Axial Loading ◽

Cement Composite ◽

Wood Fibre ◽

Wall Panel ◽

Composite Wall ◽

Fibre Cement ◽

Fibre Cement Composite

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The mechanical response of a polypropylene fibre-cement composite and its analogy with bone

Materials Science and Engineering ◽

10.1016/0025-5416(80)90217-7 ◽

1980 ◽

Vol 45 (2) ◽

pp. 117-122 ◽

Cited By ~ 1

Author(s):

M.R. Macklwy ◽

A.R. Parker

Keyword(s):

Mechanical Response ◽

Cement Composite ◽

Polypropylene Fibre ◽

Fibre Cement ◽

Fibre Cement Composite

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Reinforced Cement Composites – Effect of Hybrid Fibres on Selected Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.824.179 ◽

2015 ◽

Vol 824 ◽

pp. 179-183

Author(s):

Dana Koňáková ◽

Eva Vejmelková

Keyword(s):

Mechanical Properties ◽

Thermal Loading ◽

Bending Strength ◽

Linear Thermal Expansion Coefficient ◽

Linear Thermal Expansion ◽

Cement Composite ◽

Polypropylene Fibre ◽

Cement Composites ◽

Matrix Density ◽

Reinforced Cement

In this article selected properties of a glass and polypropylene fibre reinforced cement composite materials are studied. They are determined either after preceding thermal treatment or during thermal loading. Basic physical properties (in concrete terms bulk density, matrix density and open porosity), mechanical properties (in concrete terms tensile strength and bending strength) are determined after subjecting the specimens to the pre-heating temperatures of 600°C, 800°C and 1000°C. The linear thermal expansion coefficient is measured directly as functions of temperature up to 1000°C. The critical temperature for the glass and polypropylene fibre reinforced cement composite when most properties are worsening in a significant way is found apparently 500°C.

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Structure and Mechanical Properties of Portland Cement-Polyacrylnitril Fiber Composites

MRS Proceedings ◽

10.1557/proc-114-153 ◽

1987 ◽

Vol 114 ◽

Author(s):

I. Odler

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Portland Cement ◽

Fracture Mechanism ◽

Cement Composite ◽

Fiber Composites ◽

Cement Composites ◽

Cement Ratio ◽

Variable Water ◽

Pan Fibers

ABSTRACTA series of fiber-cement composite materials was prepared by dispersing different amounts of polyacrylnitril (PAN) fibers in portland cement suspensions of variable water/solid ratios. The samples were used to study the effect of the volume of fibers and the water-cement ratio on the physico-mechanical properties of the material. The distribution of the fibers within the cementitious matrix and the fracture mechanism were studied by SEM and compared with those existing in glass fiber-cement composites.

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Influence of Silica Based Carbon Nano Tube Composites in Concrete

Advanced Composites Letters ◽

10.1177/096369351702600103 ◽

2017 ◽

Vol 26 (1) ◽

pp. 096369351702600

Author(s):

BLP Dheeraj Swamy ◽

Vaibhav Raghavan ◽

K Srinivas ◽

K Narasinga Rao ◽

Mahadevan Lakshmanan ◽

...

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Mechanical Performance ◽

Cement Mortar ◽

Cement Composite ◽

Small Scale ◽

Cement Composites ◽

Potential Candidate ◽

Carbon Nano Tube ◽

Portland Cement Paste

This study focuses on the utilization of highly densified materials in cementitious composites with objectives of improving the mechanical performance and minimizing the number and size of defects. Due to their excellent mechanical properties, carbon nanotubes (CNTs) are now viewed as potential candidate for reinforcement in cement composites. The present paper reports the use of carbon nanotubes (CNTs) as reinforcement to improve the mechanical properties of portland cement paste and creating multifunctional concrete. In order to increase the bonding, and strength, a material with intermediate fineness, highly densified silica fumes, was also utilized. The densified silica fumes along with CNT are added to cement mortar in various proportions. Small-scale specimens were prepared to measure the mechanical properties as a function of nanotube concentration and distribution. Furthermore, properties like shrinkage, permeability and alkalinity of the resultant composite were also investigated. The study addresses the significance of CNT as an additive to the enhancement of properties of cement composite.

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