Effect of Hemp Shive Sizes on Mechanical Properties of Lightweight Fibrous Composites

Števulová, Nadežda; Kidalova, Lucia; Junak, Jozef; Cigasova, Julia; Terpáková, Eva

doi:10.1016/j.proeng.2012.07.441

Cited by 42 publications

(28 citation statements)

References 6 publications

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“…[3]). According to the literature, the strength parameters depend on the type of binder, its ratio to the filler, the fraction of shives, as well as the method of mixture compaction [3,4,6]. In this study, as the amount of binder increases, the compressive and flexural strength increases.…”

Section: Compressive and Flexural Strengthmentioning

confidence: 80%

“…Investigations on the use of hemp, flax and wood fibers as insulation in loose or mat form [2] were carried out. In addition to fibers, the possibility of using wooden parts of plants, such as hemp [3,4], flax shives [3] or rape straw [5], in the building industry is also being investigated. These materials are characterized by high porosity, low thermal conductivity and high thermal capacity.…”

Section: Introductionmentioning

confidence: 99%

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Physical and mechanical properties of composites based on hemp shives and lime

Brzyski

Łagód

2018

E3S Web Conf.

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Abstract.One of the objectives of sustainable development in construction is the use of low-processed materials. They have a positive impact on the ecological balance of the building throughout the entire life cycle. Examples of such materials are materials of plant origin -straw, shives, cellulose fibers. They are used as thermal insulation or wall material. In recent years, hemp shives are increasingly used as a component of a lime-based composite, which performs the function of wall filling in timber frame constructions. The shives, due to the high porosity, determine the high thermal insulation properties of the composite. The physico-mechanical properties of the composite can be modified depending on various factors, including the ratio of hemp shives to the binder. The lime binder, in turn, can be modified by hydraulic and pozzolan additives. The paper presents mechanical properties (compressive and flexural strength) as well as physical properties (density, porosity, thermal conductivity coefficient, absorbability) of composites with various proportions of hemp shives of the Bialobrzeskie variety to the lime binder modified with Portland cement and metakaolinite.

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Section: Compressive and Flexural Strengthmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties of composites based on hemp shives and lime

Brzyski

Łagód

2018

E3S Web Conf.

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“…Nevertheless, hemp bio-based materials can have variable mechanical properties in accordance with drying process (Benfratello et al 2013), curing conditions and time of demolding (Pavía et al 2015), nature of the binder matrix (Balčiūnas et al 2013;Dinh 2014;Stevulova et al 2013), composites design (Balčiūnas et al 2013), or hemp shives characteristics (Arnaud and Gourlay 2012;Stevulova et al 2012). Hemp shives characteristics can be length or nature of shives, including with hemp shives in compliance with the requirements of the label hemp aggregate of "Construire en chanvre", meaning "Build with hemp".…”

Section: Introductionmentioning

confidence: 99%

Impact of Bio-Aggregates Properties on the Chemical Interactions with Mineral Binder, Application to Vegetal Concrete

Bourdot

Magniont

Lagouin

et al. 2019

ACT

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Plant concretes were developed and are currently used as filling material in a timber frame. Their properties are strongly related to the bio-aggregates characteristics. In addition, since hemp shiv, the reference bio-based aggregate, has a limited availability, it is necessary to consider alternative bio-aggregates largely and locally available. Thus, this paper focused on identifying and understanding mechanisms of interaction between different bio-aggregates and mineral binders. To address this issue, the first objective was to determine the properties of five hemp shives and two alternative bioaggregates for vegetal lightweight concrete: corn and sunflower bark particles. The study of the chemical interactions between bio-aggregates and a pozzolanic binder was conducted on model pastes mixed with filtered solutions containing bio-aggregates extractives. The mechanical properties of the paste, as well as their hydration and their mineralogical evolution were studied. In the last part, the mechanical behavior of vegetal concretes was assessed. The results highlight a strong relation between the mechanical behavior of pastes and concretes and the extractive content of the different tested bio-aggregates. Finally, pastes appeared as a relatively good model to predict the behavior of concretes by following their early age performances: setting delay and 3-day mechanical strength.

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“…The stem tissues inside the bark are referred as hemp or bast fiber. The fibers are composed of disordered arrangement of cellulose fibrils that are held together by the complex organic matrix of hemicellulose, lignin and proteins [18]. The inner woody portion that is surrounded by the hemp fibers contains the pith and xylem vessels and is referred as hurd or hemp hurd (Fig.…”

Section: Introductionmentioning

confidence: 99%

Improvements in self-consolidating cementitious composites by using micro carbonized aggregates

Ferro

Ahmad

Khushnood

et al. 2014

Frattura Ed Integrità Strutturale

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ABSTRACT. There is growing interest in the use of self-consolidating cementitious systems in construction industry. The present research was conducted to enhance the mechanical performance of cement composites by the utilization of micro-sized inert particles. This paper deals with the synthesis of micro-sized inert carbonized particles from hemp hurds. The synthesized carbonized particles were characterized by field emission scanning electron microscope (FESEM). These particles were further used as additive in self-consolidating cement composites. Total of four different wt% additions (i.e. 0.08, 0.20, 1.00 and 3.00 by wt% of cement) were investigated. The cement composites containing carbonized particles inclusions were characterized by three point bending and compression tests. The results indicate that the carbonized particles additions enhanced the flexural and compressive strengths of the cement composites. It was also observed that the fracture properties and the energy absorption capability of the cement composites were enhanced substantially.

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Effect of Hemp Shive Sizes on Mechanical Properties of Lightweight Fibrous Composites

Cited by 42 publications

References 6 publications

Physical and mechanical properties of composites based on hemp shives and lime

Physical and mechanical properties of composites based on hemp shives and lime

Impact of Bio-Aggregates Properties on the Chemical Interactions with Mineral Binder, Application to Vegetal Concrete

Improvements in self-consolidating cementitious composites by using micro carbonized aggregates

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