Design and multi-physical properties of a new hybrid hemp-flax composite material

Page, Jonathan; Sonebi, Mohamed; Amziane, Sofiane

doi:10.1016/j.conbuildmat.2016.12.037

Cited by 62 publications

(35 citation statements)

References 21 publications

(2 reference statements)

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“…Hemp shiv is a highly hydrophilic porous structure and shows strong capillary action, which ends up in the absorption of water up to nearly five times of its own weight that may often cause a lack of hydration. Therefore for proper slaking of the lime considerable amount of water is required in the mixture, which delays drying and setting time [ 183 ]. In contrast, incomplete hydration of binders causes unsatisfactory mechanical strength [ 184 ].…”

Section: Hempcretementioning

confidence: 99%

Hemp as a potential raw material toward a sustainable world: A review

Ahmed

Islam

Mahmud

et al. 2022

Heliyon

112

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Global warming as a result of climate change has become a major concern for people all over the world. It has recently drawn the attention of the entire conscious community, with the fear that if not addressed properly, it will result in the extinction of numerous species around the world. At the same time, it will pose a threat to human health, food security, living environment and standard of living. Thereby, possible solutions are being explored accordingly; regulations have been imposed in places binding green production practices, limiting the emission of CO 2 and emphasis is given on renewable resources along with the search for alternatives to carbon-positive materials. Cannabis sativa L. (hemp) has received a lot of attention because of its multipurpose usability, short production cycle, low capital demand in cultivation, possibility of carbon-negative transformation and easy carbon sequestering material. This paper reviews hemp as a very promising renewable resource including its potential uses in paper, textiles, composites, biofuel, and food industry.

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Section: Hempcretementioning

confidence: 99%

Hemp as a potential raw material toward a sustainable world: A review

Ahmed

Islam

Mahmud

et al. 2022

Heliyon

112

View full text Add to dashboard Cite

show abstract

“…The thermal properties of hemp-lime are sufficient for it to be used as a thermal insulation material. In previous research, thermal conductivity values measured for hemp-lime varied between 0.06 and 0.19 W/mK [20][21][22][23].…”

Section: Hemp-limementioning

confidence: 99%

Full-scale Studies of Improving Energy Performance by Renovating Historic Swedish Timber Buildings with Hemp-lime

2019

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With an increased focus on reducing greenhouse gas emissions, energy saving is of great importance in all sectors of society. EU directives set targets for member states to reduce energy use in buildings. Energy saving in historic buildings requires special measures, balancing energy-saving renovations against the preservation of heritage values. Traditional constructions are open to vapor diffusion and generally work differently from modern constructions. Modern materials in traditional constructions sometimes damages the original material as they are usually diffusion-tight. The aim of this study was to investigate whether hemp-lime could be used as an insulation material to improve the energy efficiency of historic timber building envelopes with a rendered façade in Sweden. The objective was to determine the actual energy savings for space heating. An additional objective was to determine the actual thermal transmittance and to study thermal buffering through in-situ measurements in a full-scale wall renovated with hemp-lime. Two full-scale wall sections were constructed at the Energy and Building Design laboratory at Lund University: A traditional post-and-plank wall with a lime render (80 mm), and a post-and-plank wall with a hemp-lime render (90 mm). Energy use for space heating was monitored continuously over a period of one year. The wall with a hemp-lime render required 33% less energy for space heating than the traditional post-and-plank wall with a lime render. This was accomplished without changing the framework, appearance or material in the render and without drastically changing the hygric properties of the façade. From the gathered data, the thermal transmittance (U-values) for both walls was calculated using two different methods, one based on material properties and the other based on energy use data. For both walls, thermal transmittance based on actual energy use data during the heating period was lower than what was expected from their material properties. This indicates that more material properties than thermal conductivity and material thickness need to be taken into account when performing energy use calculations. With hemp-lime, a renovation can be accomplished without damaging the timber structure and wooden slats, and it can be done with local traditional materials and building methods with no difference in appearance to a traditional lime render. This allows for heritage values to be preserved, while also allowing the building to comply with modern standards and with increased thermal comfort and reduced energy use.

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“…Hemp-lime has been used as a building material for new walls but also as insulation material when renovating or retrofitting historic buildings. While the material has good insulating properties [75][76][77][78], it is also moisture diffusion open, allowing moisture transport through the material. Hemp-lime has a complex porosity; a micro porosity inside the lime binder, meso porosity in the hemp shiv and lime binder and a macro porosity in the material due to the arrangement of the hemp shiv [79,80].…”

Section: Case Studies Using Hemp-lime As Sacrificial Plastermentioning

confidence: 99%

Understanding Deterioration due to Salt and Ice Crystallization in Scandinavian Massive Brick Masonry

Balksten

Strandberg

2021

Heritage

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Extensive durability problems such as weathering and degradation are found in historic Scandinavian brick masonry buildings, especially from the neo-Gothic period. These are largely due to the crystallization of salts and frost action in the bricks and mortars. This article aims to show and illustrate which salts and crystals are found in historic brick masonry buildings and to describe their appearance and behavior. An additional aim is to explore possibilities of preventing salt-related damage on internal masonry wall surfaces, such as using hemp-lime sacrificial plaster beneath the plaster. The objective is to show the mechanisms behind salt-related problems and to perform a case study and a laboratory study on salt-damaged brick masonry containing sodium sulphate. In order to prevent and stop damage to the masonry, it is important to be able to identify the nature of the salt damage and the type of salt that caused the damage. Neo-Gothic brick masonry buildings require well-planned, continuous maintenance of the masonry. It is therefore of the utmost importance to have an understanding of the complex functions of the masonry and of the salts that can cause damage to these historic buildings.

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Design and multi-physical properties of a new hybrid hemp-flax composite material

Cited by 62 publications

References 21 publications

Hemp as a potential raw material toward a sustainable world: A review

Hemp as a potential raw material toward a sustainable world: A review

Full-scale Studies of Improving Energy Performance by Renovating Historic Swedish Timber Buildings with Hemp-lime

Understanding Deterioration due to Salt and Ice Crystallization in Scandinavian Massive Brick Masonry

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