Characterization and comparison of hygric properties of rape straw concrete and hemp concrete

Rahim, M. Kaysar; Douzane, Omar; Le, Anh Huy Tuan; Promis, Geoffrey; Langlet, Thierry

doi:10.1016/j.conbuildmat.2015.11.021

Cited by 122 publications

(71 citation statements)

References 27 publications

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“…Different shapes of hemp shives cause them to randomly form an air voids between the individual shives during the compaction of mix. According to Rahim's research [5] composites porosity was comparable -hemp composite with apparent density of 478 kg/m 3 indicated total porosity equal to 76.4% and rape straw composite with apparent density of 487 kg/m 3 indicated total porosity equal to 75.1% . Other research [8] has presented that composite revealed total porosity of 79% with the apparent densities of 430-460 kg/m 3 .…”

Section: Apparent Density Specific Density and Total Porositymentioning

confidence: 98%

“…The difference in comparison with own research could be related to the compaction force [7] or the size of shives. The obtained apparent density values can be compared to the apparent density of composites based on other plant components, eg flax shives (405-467 kg/m 3 [3]) or rape straw (487 kg/m 3 [5]). Total porosity of the tested composites ranged between 78.7 and 80.1% (Table 3).…”

Section: Apparent Density Specific Density and Total Porositymentioning

confidence: 99%

“…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: Apparent Density Specific Density and Total Porositymentioning

confidence: 98%

Section: Apparent Density Specific Density and Total Porositymentioning

confidence: 99%

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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“…Many studies have underlined the great interest of the hygrothermal properties of bio-based materials (Bourdot et al 2017;Collet and Pretot 2012;Rahim et al 2014;Ratiarisoa et al 2016). Use of bio-aggregates reduces the thermal conductivity of many materials because of the high porosity of hemp shives (Bennai et al 2018;Bourdot et al 2017;Rahim et al 2016), while moisture exchanges with the air around the material could enhance indoor comfort.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to consider other bio-aggregates largely and locally available. Some alternative bio-aggregates, such as flax shives (Rahim et al 2015), rape straw (Rahim et al 2016), lavender stalks (Ratiarisoa et al 2016) etc. have been studied.…”

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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Physico-chemical Characterization and Development of Hemp Aggregates for Highly Insulating Construction Building Materials

Jiang

Hussain

Heidari

et al. 2020

Sustainable Agriculture Reviews

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The natural hemp aggregates and their bio-composite panels which have been developed for sustainable construction with low thermal conductivity and high hygrothermal efficiency. The combination of the hemp aggregates with natural matrix materials results in exceptionally low thermal conductivity and high hygrothermal efficiency compared to conventional materials of construction as a result of their microporosity and breathability. In addition, the developed biobased composites with nanotechnology improve resistance to liquid water and protect the hemp shiv from biodegradation without impacting the natural ability of the shiv to buffer moisture vapor.The chapter assesses the physical characteristics of hemp aggregates in terms of their density, microstructure and porosity. Hemp-concrete and novel Hemp-organic composite have been studied and compared. Measurements of the thermal conductivity of hemp-composite panels are described which confirm their highly insulating properties. Hygroscopic testing demonstrates their effectiveness in absorbing and releasing moisture. The thermal and hygroscopic performance of hemp-composite panels in test cells is reported together with their application in construction. The life cycle assessment of hempcrete and hemp organic composite were performed. This chapter is part of the output of the ISOBIO programme supported by the European Union Horizon 2020 program, within the 'Materials for Building Envelopes' call for Energy Efficient Buildings.

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Characterization and comparison of hygric properties of rape straw concrete and hemp concrete

Cited by 122 publications

References 27 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

Physico-chemical Characterization and Development of Hemp Aggregates for Highly Insulating Construction Building Materials

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