Experimental investigation on the influence of immersion/drying cycles on the hygrothermal and mechanical properties of hemp concrete

Benmahiddine, Ferhat; Bennai, Farès; Cherif, Rachid; Belarbi, Rafik; Tahakourt, Abdelkader; Abahri, Kamilia

doi:10.1016/j.jobe.2020.101758

Cited by 36 publications

(43 citation statements)

References 42 publications

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“…Indeed, MBV greater than 2 [g/(%HR.m 2 )] corresponds to excellent moisture regulator materials according to the Nordtest classification. These results are in good agreement with those reported in literature [34,51,52]. Bio-based materials, including flax and hemp concrete, are shown to be excellent moisture regulators.…”

Section: Moisture Buffer Value (Mbv)supporting

confidence: 92%

“…As can be observed, the investigated mortar mixtures showed a high porosity between 68% and 71%. These values are in good agreement with those reported in literature on the hemp (71%) and flax (74%) concrete mixtures [34,51,52]. The fiber mortar mixtures As can be observed, the investigated mortar mixtures showed a high porosity between 68% and 71%.…”

Section: Porosity Of the Fibers-reinforced Mortar Mixturessupporting

confidence: 91%

“…The fiber mortar mixtures As can be observed, the investigated mortar mixtures showed a high porosity between 68% and 71%. These values are in good agreement with those reported in literature on the hemp (71%) and flax (74%) concrete mixtures [34,51,52]. The fiber mortar mixtures incorporating 5% of PS and HF showed slightly higher porosity than those containing only 2.5% of fibers and the reference mortar mixtures.…”

Section: Porosity Of the Fibers-reinforced Mortar Mixturessupporting

confidence: 91%

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Hygrothermal and Mechanical Behaviors of Fiber Mortar: Comparative Study between Palm and Hemp Fibers

et al. 2021

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This paper presents an experimental investigation of the hygrothermal and mechanical properties of innovative mortar mixtures reinforced with natural fibers. Fibers extracted from palm stems (PS) and hemp (HF) were evaluated at different percentages. Scanning electron microscope (SEM) observations showed that the PS fibers have rough surfaces and very complex microstructures. Prior to their incorporation into the mortar, the fibers were subjected to different treatments to reduce their hydrophilic character. The employed treatments showed good efficiency in reducing the water absorption of both PS and HF fiber types. Furthermore, the mortar mixtures incorporating these fibers exhibited low thermal conductivity and excellent moisture buffering capacity. Indeed, the moisture buffer value (MBV) of the investigated mixtures ranged between 2.7 [g/(%HR·m2)] and 3.1 [g/(%HR·m2)], hence providing them excellent moisture regulator character. As expected, the fiber mortar mixtures showed very high porosity and low compressive strength ranging between 0.6 and 0.9 MPa after 28 days of age. The low-environmental footprint materials developed in this study are intended for thermal insulation and building filling.

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Section: Moisture Buffer Value (Mbv)supporting

confidence: 92%

Section: Porosity Of the Fibers-reinforced Mortar Mixturessupporting

confidence: 91%

Section: Porosity Of the Fibers-reinforced Mortar Mixturessupporting

confidence: 91%

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Hygrothermal and Mechanical Behaviors of Fiber Mortar: Comparative Study between Palm and Hemp Fibers

et al. 2021

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“…This water uptake contrasts with the stable behaviour of hemp concrete during the preconditioning step with the exception of the presence of disturbances in form of peaks at the set points. These peaks are due to the sensitivity of hemp concrete to the thermodiffusion phenomenon, where the heat transfer affects the mass transfer for this material [31][32][33].…”

Section: Temperature and Relative Humidity Evolutionsmentioning

confidence: 99%

Hygrothermal and Microstructural Investigation of PLA and PLA-Flax Printed Structures

Belarbi

Benmahiddine

Hamami

et al. 2022

Fibers

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The aim of this work is to explore the manufacturing of insulation structures using fused filament deposition of biosourced materials. The approach considers printing of Polylactic acid (PLA) and PLA-flax (PF) structures using varied infill density and printing temperatures. Differential Scanning Calorimetry and Thermal Gravimetry analysis are performed to study thermal behaviour of PLA and PF and derive weight content of fibres within PF. Thermal measurements show a strong dependence of thermal conductivity with infill density and slightly improved thermal insulation of PF compared to PLA. Moreover, both PF and PLA show a hydrophobic behaviour unlike conventional green concretes based on hemp or flax. In addition, both scanning electron and optical microscopies show marked morphological changes induced by the laying down process for PF. This latter exhibits a more complex and tortuous microstructure compared to PLA marked by the presence of inter-filament porosity. This work concludes with superior hygrothermal properties of PLA and PF compared to other biosourced materials such as hemp or flax concrete. This work also concludes with the beneficial role of flax fibres that provides better hygrothermal properties to the printed structures as well as on the need to optimize the infill characteristics including density and cell morphology density.

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“…After the compressive-strength tests, concrete fragments were taken to measure porosity by mercury intrusion porosimetry (MIP) in all the mixtures, except in the validation mixtures VM1 and VM2. There was no variation in the capillary porosity of the cementitious matrix with age after 7 days [40] so a single measurement was considered valid for all ages.…”

Section: Design and Experimental Testsmentioning

confidence: 99%

Elastic stiffness estimation of aggregate–ITZ system of concrete through matrix porosity and volumetric considerations: explanation and exemplification

Revilla‐Cuesta

Skaf

Santamarı́a

et al. 2022

Archiv.Civ.Mech.Eng

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The modulus of elasticity of a concrete depends on the elastic stiffness of both the cementitious matrix and the aggregate–ITZ system, which includes any slippage mechanisms under loading between the aggregate and the cementitious matrix within the interfacial transition zone (ITZ). A procedure is presented in this paper to estimate the elastic stiffness of an aggregate–ITZ system within a cementitious matrix, by considering the relative volumes and the porosities of the concrete components. The method was validated by determining the elastic stiffness of both the limestone–ITZ and the electric arc furnace slag (EAFS)–ITZ systems when embedded in a slag-based cementitious matrix. The greater stiffness of the EAFS–ITZ system in comparison with the natural aggregate system explained the higher strength and modulus of elasticity of the concrete following additions of EAFS. Moreover, having determined those parameters, the elastic moduli of concretes with a similar cementitious matrix could then be accurately estimated.

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Experimental investigation on the influence of immersion/drying cycles on the hygrothermal and mechanical properties of hemp concrete

Cited by 36 publications

References 42 publications

Hygrothermal and Mechanical Behaviors of Fiber Mortar: Comparative Study between Palm and Hemp Fibers

Hygrothermal and Mechanical Behaviors of Fiber Mortar: Comparative Study between Palm and Hemp Fibers

Hygrothermal and Microstructural Investigation of PLA and PLA-Flax Printed Structures

Elastic stiffness estimation of aggregate–ITZ system of concrete through matrix porosity and volumetric considerations: explanation and exemplification

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