Characterization of flax lime and hemp lime concretes: Hygric properties and moisture buffer capacity

Rahim, M. Kaysar; Douzane, Omar; Le, Anh Huy Tuan; Promis, Geoffrey; Laidoudi, Boubker; Crigny, A.; Dupre, B.; Langlet, Thierry

doi:10.1016/j.enbuild.2014.11.043

Cited by 147 publications

(74 citation statements)

References 27 publications

(33 reference statements)

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“…It was adapted to the local, Polish soil-climatic conditions. The hemp filler was characterized with high total porosity, about 90%, which has also been confirmed by literature (90.1 ± 0.5% [36]), and low apparent density, about 130 kg/m 3 , as in other studies (about 125 ± 9 kg/m 3 [36]). The applied mixture of hemp shives was characterized by a large diversity in length, width, and thickness of fractions.…”

Section: Description Of Materialssupporting

confidence: 89%

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Brzyski

Suchorab

2020

Materials

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The use of waste plants in the production of building materials is consistent with the principles of sustainable development. One of the ideas involves using hemp shives as an aggregate for the production of a composite used as a filling of the timber frame construction of the walls. The most important disadvantage of using the building materials based on organic components is their susceptibility to the water influence. The wall material is exposed to rising groundwater. The research part of the paper presented the preparation method and the investigation of the hemp-perlite-lime composites. Flexural and compressive strength, apparent density, total porosity, thermal conductivity, and mass absorptivity were examined. The main research part pertained to the analysis of capillary uptake occurrence in the composites, being the important phenomenon present in the external walls. The study on this phenomenon was carried out using the technique of indirect moisture evaluation—Time Domain Reflectometry (TDR). The indirect readouts were additionally verified with the traditional evaluation using the gravimetric method based on the PN-EN 1925 standard. The study proved that the tested composites were characterized by low apparent density, thermal conductivity, strength parameters, high total porosity, and mass absorptivity. The partial replacement of hemp shives by expanded perlite had a beneficial effect on the tested properties of composites.

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Section: Description Of Materialssupporting

confidence: 89%

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Brzyski

Suchorab

2020

Materials

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“…In the case of vapour permeable materials, however, the moisture penetration depth may be significantly greater than the usual thicknesses: for example, the moisture penetration depth can reach 10 cm for gypsum boards, while indoor sidings are generally 13 mm thick. It was also observed for hemp lime or flax lime concretes that the theoretical penetration depth was significantly smaller than the experimentally observed value [38].…”

Section: Buffering Potential Of Hygroscopic Materialsmentioning

confidence: 78%

From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential

Labat

Magniont

Oudhof³

et al. 2016

Building and Environment

110

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. From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential. Building and Environment, Elsevier, 2016, 97, pp.69 -81. 10.1016/j.buildenv.2015 1 From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential ABSTRACTThe development of innovative materials has to respond to both environmental and energy concerns. Bio-based materials are relevant because they are made from renewable raw materials and are carbon neutral. Similarly, unprocessed earth has a very low embodied energy. In this paper, the basic hygrothermal properties of straw-clay samples provided by two French companies were determined. Mixes with densities lower than 450 kg.m -3 would be suitable for use as self-insulating material in current construction. In addition, the material showed a high sorption capacity and very high water vapour permeability. The measurements were then implemented in a numerical model in order to simulate the hygric response of a small room. The straw-clay mixture was found to have a moisture buffering effect of the same magnitude as walls made of hemp concrete and largely higher than conventional walls. The influence of various indoor finishing materials was investigated through additional simulations.

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“…The moisture buffer value can be classified within the 'practical moisture buffer value classes', consisting of the following ranges: negligible, limited, moderate, good and excellent [19]. The moisture buffer value of exposed hemp-lime samples are reported as either 'Good' or 'Excellent' by a number of authors [16,17].…”

Section: Introductionmentioning

confidence: 99%

Moisture buffer potential of experimental wall assemblies incorporating formulated hemp-lime

Latif

Lawrence

Shea

et al. 2015

Building and Environment

115

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a b s t r a c tExperiments were carried out according to the Nordtest protocol to study the moisture buffer potential of hemp-lime walls with a range of different internal linings and surface treatments. It was observed that the moisture buffer value was 'Excellent' when the inner surface of hemp-lime was exposed. 'Excellent' moisture buffer values were also obtained for hemp-lime with lime plaster. All other assemblies demonstrated 'Good' moisture buffer value. Moisture buffer values of the assemblies, after application of paint on the upper surfaces, were also determined. It was observed that application of synthetic pigment based trade paint could reduce the moisture buffer performance of the assembly consisting of hemp-lime and lime-plaster from 'Excellent' to 'Good' while between 61 and 69% reduction of moisture buffer value was observed for the other assemblies. However, the reduced buffer values of the assemblies are still comparable with other moisture buffering building materials. It was further observed that moisture buffer performance was improved when clay based organic paint was used instead of trade paint.

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Characterization of flax lime and hemp lime concretes: Hygric properties and moisture buffer capacity

Cited by 147 publications

References 27 publications

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential

Moisture buffer potential of experimental wall assemblies incorporating formulated hemp-lime

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