Influence of nanomaterials on properties of lime and hemp/lime composites for energy efficient wall design

O'Flaherty, Fin; Khalaf, Faraj Jabber; Starinieri, Vincenzo

doi:10.1080/17512549.2019.1586584

Cited by 4 publications

(1 citation statement)

References 24 publications

(25 reference statements)

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“…Furthermore, hemp shives (HS), polyvinyl acetate (PVAc), hemp fibers (HF) and fiber glass (FG) were also used to determine their effects on the mechanical strength properties. The impact of these components on other properties such as thermal conductivity, porosity, shrinkage, water absorption and water vapour permeability of lime was also studied but is outside the scope of this paper (O'Flaherty et al, 2019). SEM images were taken of many specimens to obtain a better understanding of the composition of the fibers and lime matrix.…”

Section: Introductionmentioning

confidence: 99%

Development of Lime Based, Load-Bearing Materials for Wall Construction

O'Flaherty¹,

Khalaf²,

Starinieri³

2020

Proceedings of International Structural Engineering and Construction

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Construction of buildings in the UK is traditionally done using building materials such as concrete blocks, bricks and less so, timber. Although timber is a sustainable product, concrete blocks and bricks require a lot of energy input during fabrication, concrete especially being a large producer of CO2 during its manufacture. Reducing energy consumption either domestically or industrially is an important part of achieving the UK Government’s legally binding commitment to reducing greenhouse gas emissions by at least 80% (relative to 1990 levels) by 2050. New, low embodied energy construction materials are urgently required to enable the construction industry to revolutionize and drastically decrease its carbon footprint. The constituents of the materials investigated were selected based on low embodied energy criterion. To achieve this, lime was selected as the base material with hemp (fibers and shives) and PVAc used as additives. Specially selected nanomaterials were used as fillers. The constituents were combined in a manner, which led to different materials being developed, all exhibiting different characteristics. One characteristic was strength (load bearing) to eliminate the use of timber studding during construction. The results show that the highest strengths were achieved by mixing 10 wt. % hemp fiber, 4 wt. % nanozinc oxide and 12 wt. % PVAc at a 0.4 W/L ratio, yielding 17.7 MPa in compression and 7.3 MPa in flexure.

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Section: Introductionmentioning

confidence: 99%

Development of Lime Based, Load-Bearing Materials for Wall Construction

O'Flaherty¹,

Khalaf²,

Starinieri³

2020

Proceedings of International Structural Engineering and Construction

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Influence of additives on strength enhancement and greenhouse gas emissions of pre-cast lime-based construction products

O’Flaherty,

Khalaf,

Starinieri

2023

Low-carbon Mater. Green Constr.

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Strength properties of laboratory scale lime-based samples enhanced with additives such as nanomaterials (nanofibrillated cellulose, nanosilica, nanoclay, expanded graphite), hemp & glass fibres, hemp shiv and polyvinyl acetate (PVAc) are determined. Samples were cured for 26 days in air at 20˚C / 60% RH after casting before being oven dried for a further two days at 50˚C (28 days total). Results show that the nanomaterials on their own had a mixed effect on the strength although nSiO2 as a solo additive performed exceptionally well. The combination of fibres in conjunction with PVAc also greatly enhanced the strength due to increased bond between the fibres and the matrix. In addition, Greenhouse Gas emissions (GHG, kgCO2eq) of an arbitrary block was determined for all composites and compared to the GHG of a commonly used lightweight aerated concrete block. Comparison of the normalised compressive strengths to the different loading conditions as outlined in BS EN 8103 shows that a more widespread use of pre-cast lime composites is possible and without unduly increasing GHG emissions.

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Editorial

Inthavong

Ito

2020

Advances in Building Energy Research

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Influence of nanomaterials on properties of lime and hemp/lime composites for energy efficient wall design

Cited by 4 publications

References 24 publications

Development of Lime Based, Load-Bearing Materials for Wall Construction

Development of Lime Based, Load-Bearing Materials for Wall Construction

Influence of additives on strength enhancement and greenhouse gas emissions of pre-cast lime-based construction products

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