Behaviour of composite soil reinforced with natural fibres

Ghavami, Khosrow; Filho, Romildo Dias Toledo; Barbosa, Normando Perazzo

doi:10.1016/s0958-9465(98)00033-x

Cited by 346 publications

(195 citation statements)

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“…For dry and wet compressive strength test, it was evident that the fibers provided sufficient resistance towards breakage, holding the block more intact compared to the unreinforced CSEB. This supports the theory where reinforcing fibers in the soil matrices prevent cracking through their adhesion or bonding [6]. Meanwhile, unreinforced CSEB presents noticeable breakage since there is no added fibers that holds the block together.…”

Section: Influence Of Fiber On Failure Modesupporting

confidence: 82%

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Investigation of the Effects of Different Natural Fibers on the Strength of Compressed Stabilized Earth Blocks (Cseb)

Lejano

Pineda

2018

GEOMATE

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This study investigates the most effective combination of natural fibers (namely coconut coir, abaca, and maguey) used as reinforcement for Compressed Stabilized Earth Blocks (CSEB). Portland cement and 0.25% fibers by weight were used to stabilize and reinforce CSEB, respectively. The blocks were made primarily with Manila soil and were formed using hand-pressed machine. CSEB without fibers were first tested with varying cement contents of 6%, 8%, 10%, and 12% by weight. This was examined to determine the practical cement content (PCC). Three strength tests namely dry compressive strength, wet compressive strength, and flexural strength were conducted on CSEB at PCC with different fiber combinations of coir, abaca, and maguey fibers to determine the mix producing maximum strength. The highest dry compressive strength was obtained with 100% maguey fiber; the highest wet compressive strength was obtained with 100% abaca fiber; while the highest flexural strength was obtained with 17% coir fiber, 17% abaca fiber, and 67% maguey fiber. Using the Response Surface Methodology (RSM), the maximum strengths were predicted as follows: 100% maguey for dry compressive strength, 100% abaca for wet compressive strength, and 38.4% abaca and 61.6% maguey for flexural strength. However, the optimal mix of CSEB for three the strength tests consists of CSEB with 42.5% abaca and 57.5% maguey. The fibers were found to improve the performance of the block such as the strength and post-crack behavior. Furthermore, the performances of a wall made of fiber-reinforced and unreinforced CSEB were investigated. The test results showed a 33.79% increase in load carrying capacity of the fiber-reinforced wall compared to unreinforced wall.

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Section: Influence Of Fiber On Failure Modesupporting

confidence: 82%

“…The length of the fibers considered was based on the studies of [6], [7], where 50-mm fibers were used in the production of their CSEBs. The coir fibers were processed using dry mill while abaca fibers were extracted by hand.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Effects of Different Natural Fibers on the Strength of Compressed Stabilized Earth Blocks (Cseb)

Lejano

Pineda

2018

GEOMATE

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“…The upper, lower, mean and coefficient of variation (CV) of the physical and mechanical properties of these fibres based on a minimum of twenty tests are given in Table 1 [4,7,8]. The Thames Valley sand used in this investigation had a fineness modulus of 2.81, specific gravity of Table 1 Physical and mechanical properties of sisal and coconut fibres [4,7,8] 2.65 and total moisture content of 0.35%, determined using the procedures specified in British Standard 812 [9]. Chemical and physical properties of the OPC, ground granulated blast-furnace slag (GGBS), undensified silica fume and slurry silica fume used are presented in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Development of vegetable fibre–mortar composites of improved durability

Filho

Ghavami

England

et al. 2003

Cement and Concrete Composites

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388

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The primary concern for vegetable fibre reinforced mortar composites (VFRMC) is the durability of the fibres in the alkaline environment of cement. The composites may undergo a reduction in strength and toughness as a result of weakening of the fibres by a combination of alkali attack and mineralisation through the migration of hydration products to lumens and spaces. This paper presents several approaches used to improve the durability performance of VFRMCs incorporating sisal and coconut fibres. These include carbonation of the matrix in a CO 2 -rich environment; the immersion of fibres in slurried silica fume prior to incorporation in the ordinary Portland cement (OPC) matrix; partial replacement of OPC matrix by undensified silica fume or blast-furnace slag and a combination of fibre immersion in slurried silica fume and cement replacement. The durability of the modified VFRMC was studied by determining the effects of ageing in water, exposure to cycles of wetting and drying and open air weathering on the microstructures and flexural behaviour of the composites. Immersion of natural fibres in a silica fume slurry before their addition to cement-based composites was found to be an effective means of reducing embrittlement of the composite in the environments studied. Early cure of composites in a CO2-rich environment and the partial replacement of OPC by undensified silica fume were also efficient approaches in obtaining a composite of improved durability. The use of slag as a partial cement replacement had no effect on reducing the embrittlement of the composite.

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“…In previous studies, it was found that adding fibres to rammed earth or to composite soils either decreased the unconfined compressive strength (UCS) (Maniatidis and Walker, 2003;Schroeder et al, 2005) or gave a small increase at low-fibre contents (Bouhicha et al, 2005;Galán-Marín et al, 2010;Ghavami et al, 1999;Houben and Guillaud, 1994;Marandi et al, 2008). The effect of fibre content on UCS was possibly governed by the clay content of the soil; soils with larger clay contents responded to increased fibre content with a higher UCS, while more sandy soils showed a lower UCS with increased fibre content.…”

Section: Fibre Stabilisation In Rammed Earthmentioning

confidence: 99%

Fibre reinforcement in earthen construction materials

Readle

Coghlan

Smith

et al. 2016

Proceedings of the Institution of Civil Engineers - Constructio

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. proposed that reinforcement be added in the form of fibres of various materials. Construction in earthquake-prone parts of the world is thought to benefit from this form of reinforcement, and indeed fibres (in the form of straw) are a key part of many adobe (unit-based) materials. To remain in harmony with the generally excellent environmental credentials of these materials, the reinforcement should be obtained from a natural material ideally obtained as a waste stream, so natural fibres are often chosen. While some studies have been published on the macroscopic mechanical behaviour of reinforced earthen materials, little is known of what is happening at the interface between the soil matrix and the fibres. In this paper, the authors present laboratory-based studies that attempt to fill this gap, covering pull-out behaviour of natural fibres embedded in earthen construction materials, both stabilised and unstabilised.

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Behaviour of composite soil reinforced with natural fibres

Cited by 346 publications

References 0 publications

Investigation of the Effects of Different Natural Fibers on the Strength of Compressed Stabilized Earth Blocks (Cseb)

Investigation of the Effects of Different Natural Fibers on the Strength of Compressed Stabilized Earth Blocks (Cseb)

Development of vegetable fibre–mortar composites of improved durability

Fibre reinforcement in earthen construction materials

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