Influence of accelerated aging on the properties of hemp concretes

Marceau, Sandrine; Glé, Philippe; Guéguen-Minerbe, Marielle; Gourlay, Étienne; Moscardelli, Sandrine; Nour, Issam; Amziane, Sofiane

doi:10.1016/j.conbuildmat.2016.11.129

Cited by 46 publications

(23 citation statements)

References 15 publications

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“…and HS3. This accords with the previous studies conducted with the three types of shiv [2,35], in which the mechanicals strengths of the hemp concretes were found to be very different depending on the type of shiv used. On the basis of these data, the CX' factors are determined (Table 4).…”

Section: Effect Of Type Of Shivsupporting

confidence: 92%

“…The first is the shiv which we used previously in the durability study, where a lack of hydration was observed [2]. The other two shives are of different origins, and were used in an earlier study, where no problem was found with the hydration [35].…”

Section: Vegetalmentioning

confidence: 99%

“…Three types of hemp shiv were selected for this investigation, based on observations made during previous studies [2,35]. They are referred to as HS1, HS2 and HS3 ( Figure 1).…”

Section: Types Of Shivmentioning

confidence: 99%

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Impact of hemp shiv extractives on hydration of Portland cement

Delannoy

Marceau

Glé

et al. 2020

Construction and Building Materials

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When formulating materials containing an hydraulic binder and plant particles, the setting of the binder may be slowed or prevented by the compounds extracted from the plant. In this article, a methodology is fixed to analyse three types of hemp shiv and to study the variability of the composition of extractives and their influence on the hydration of cement. Isothermal calorimetric measurements have shown that one type of shiv caused a greater delay in the setting of the cement. Analysis of free compounds extracted from the plant has shown that this shiv has a higher content of extractives, and in particular, of sugar. By using the same quantities of standard sugars, it was found that the measured sugar content could not, in and of itself, account for the delay in hydration measured in the presence of shiv. Other extracted molecules, such as phenolic compounds, also play a part in the hydration of the cement.

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Section: Effect Of Type Of Shivsupporting

confidence: 92%

Section: Vegetalmentioning

confidence: 99%

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Impact of hemp shiv extractives on hydration of Portland cement

Delannoy

Marceau

Glé

et al. 2020

Construction and Building Materials

Self Cite

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“…Several durability mechanisms have been studied thus far; from biological aging [8], [9], fire exposure [10], wetting and drying with variable humidity cycles [9], [11], carbonation [12], [13], salt exposure and freeze-thaw [14].…”

Section: Introductionmentioning

confidence: 99%

The effect of long term weathering on hemp and rapeseed concrete

Sheridan

Sonebi

Taylor

et al. 2020

Cement and Concrete Research

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Two vegetal aggregate types are studied for their performance regarding immersion and outdoor weathering. The most widely researched bio-aggregate to date is hemp shiv; which is used in this study as well as chopped rapeseed straw which is an alternative bio-aggregate widely available in the UK. In this study the binder used is Vicat prompt natural cement as well as a viscosity modifying agent (VMA) admixture. It was found that the hemp aggregate produced the most durable concrete when compared to rapeseed, and the addition of a VMA resulted in a much more durable material for both aggregate types. Organic and inorganic leaching was also investigated, and it was found that the binder and soluble organics were leaching from all of the concrete types.

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“…As a result, hemp shiv based building composites have extremely long drying times when mixed with lime [9], or they have poor interfacial adhesion with the polymeric matrix [10]. Moisture sensitivity also results in microbial growth causing degradation of the aggregate cell wall and deterioration of the composite durability [11].…”

Section: Introductionmentioning

confidence: 99%

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

Hussain

Calabria-Holley

Lawrence

et al. 2019

Construction and Building Materials

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This study focuses on the surface treatment of an extremely hydrophilic natural plant material, hemp shiv, using a functionalised silica based coating to provide hydrophobicity while retaining its moisture buffering ability. The chemical composition and physical structure of bio-based materials results in their extremely hydrophilic behaviour. In this work, a simple one step coating process was used to enhance the water-repellence of hemp shiv without compromising its ability to adsorb and release moisture. The coating modified the morphology and surface roughness of hemp shiv providing a hydrophobic surface having a water contact angle of 118° and reduced the bulk water absorption by 250% over 24 hours. Mercury intrusion porosimetry (MIP) showed that the treatment refined the pore size distribution of hemp shiv, reducing the size of larger pores but not completely blocking the smaller pores thereby allowing hemp shiv to buffer moisture. Fourier-transform infrared spectroscopy (FTIR) revealed the chemical composition was modified by the coating, reducing the hydroxyl groups. Hemp shiv aggregates treated with functionalised silica based coating show potential for the development of robust lightweight building materials with enhanced hydrophobicity.

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Influence of accelerated aging on the properties of hemp concretes

Cited by 46 publications

References 15 publications

Impact of hemp shiv extractives on hydration of Portland cement

Impact of hemp shiv extractives on hydration of Portland cement

The effect of long term weathering on hemp and rapeseed concrete

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

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