Papers by Nicolas Montrelay
Academia Materials Science, Oct 30, 2023
The biobased mortars are gaining interest because of the opportunity to upgrade agricultural byp... more The biobased mortars are gaining interest because of the opportunity to upgrade agricultural byproducts and to reduce environmental impact of cementitious materials. However, to face the drawbacks linked to the use of flax byproducts, such as mucilage and its hygroscopy, it’s necessary to study the impact of the water to cement ratio and the addition way of mucilage on mortars. The W/C ratios range from 0.5 to 0.8 and the mucilage is added anhydrous with cement or pre-dissolved in the mixing water. High W/C ratios affect both fresh and hardened properties of mortars. A high ratio accelerates the setting process and generates more heat released on unmodified mortars while decreasing the induction period. Conversely, when mucilage is added, the setting time is increased due to a poisoning effect affecting the hydrates growth by a chemisorption mechanism on Ca2+. This delay is higher as the W/C ratio rises and the mucilage is in-solution. Anhydrous mucilage accelerates the setting until the highest water content is reached. The undissolved polysaccharides of the mucilage cannot impact the hydration process for a W/C ratio below 0.8. Increasing the water content is beneficial for the mortars strengths but an excessive W/C ratio is harmful for the unmodified mortar. Mucilage polysaccharides generate a lack of strength compared to the standard. This reduction in strengths is lowered in flexural tests due to an elastic behavior conferred by the mucilage. The changes in properties are not correlated to any mineralogical modification as shown by FTIR and TGA analyses.
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Energies
The lubricating oil industry is widespread in the world, but getting rid of the used oils has bec... more The lubricating oil industry is widespread in the world, but getting rid of the used oils has become an environmental concern. Lubricating oils are used in industries and cars but potentially contaminate groundwater after use. This research uses montmorillonite clay to refine old oil treated with acetic acid. Compared to more conventional procedures, the suggested strategy for treating waste oil is more cost-effective due to the relatively inexpensive cost of the acid and the modest process conditions. Water content, sediment content, density, flash and fire points, viscosity, viscosity index, total acid and base number, pour points, and refractive index were among the physicochemical parameters of the treated oil that were examined as a result of this treatment. We analyzed the oils using Fourier transform infrared spectroscopy (FTIR) and atomic absorption spectrometry (AAS). New oil (10w 40), old oil, oil treated with acetic acid, and montmorillonite clay were all put through thei...
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Journal of Architectural Environment & Structural Engineering Research
The approach that contributes to the development of eco-materials in construction is the use of m... more The approach that contributes to the development of eco-materials in construction is the use of mineral powders, which can improve mechanical properties and reduce cement consumption. This article aims to study the effect of substitution by mass of cement with mineral powders on the physicomechanical properties and microstructure of sand concretes. The used mineral powders are A: the limestone, B: the natural pozzolan, C: the hydraulic lime, D: (1/3 limestone + 1/3 natural pozzolan + 1/3 hydraulic lime), and E: (1/2 natural pozzolan + 1/2 hydraulic lime). The studied percentages are 5%, 10% and 15%, in both separated and combined states. The studied properties are workability, compressive strength, the elasticity modulus in compression, shrinkage and microstructure analysis. The objective is to target the optimal percentage of the substitution of cement with mineral powders, which ensures the best compromise between the main properties of the studied sand concretes. The obtained res...
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Matériaux 2018, Nov 1, 2018
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Proceedings of the 4th International Symposium on Materials and Sustainable Development, 2020
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Revue des composites et des matériaux avancés, 2006
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Construction and Building Materials, 2014
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Polymer, 2006
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Industrial Crops and Products, 2011
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Composites Science and Technology, 2007
... By embedding natural reinforcing fibres such as flax, hemp and ramie into a biopolymeric matr... more ... By embedding natural reinforcing fibres such as flax, hemp and ramie into a biopolymeric matrix made out of derivatives from cellulose, starch, polylactic acid, polycaprolactone for example, new fibre-reinforced materials called biocomposites have been created and are still ...
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Construction and Building Materials, 2016
Abstract It is an experimental work that aims to study an eventual contribution to the developmen... more Abstract It is an experimental work that aims to study an eventual contribution to the development of a eco-lightweight concrete destined to be used in arid environments by using local and renewable materials and waste. Its main objective is the assessment of the effect of the addition of barley straws on the physico-mechanical properties and the microstructure of a concrete which consists only of sand as main aggregate. Indeed, the study was devoted, firstly to determine the optimal composition of sand concrete based on barley straws by researching a good compromise between compactness and workability, and secondly, to study its physical, mechanical, thermal and microstructural properties. The obtained results showed that the addition of barley straws to the sand concrete significantly improves its thermo-physical properties. According to the quantity of straws introduced in the sand concrete, the improvements in the flexural strength have reached 6%. Significant improvements have also been recorded in other properties, such as lightness, deformability, ductility, toughness and thermal characteristics. However, the increase of barley content decreases the compressive strength and increases the dimensional variations. But it should be noted that obtaining acceptable strength values is possible according to the straw content and the shrinkage values are in general less than the recommended limit for wood concretes. As to the microstructure of the studied composite, the SEM analysis showed that the presence of lignocellulosic aggregates did not alter the development of species within the cementitious matrix. Moreover, and contrary to the case of wood aggregates, only calcium species are observed in the vicinity of the lignocellulosic material, there are no silica species. Finally, it should be also noted the easy introduction of the cementitious material inside the tubular pores of some straws.
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Construction and Building Materials, 2016
Abstract This work goes within the framework of the valorization of local materials and wastes, s... more Abstract This work goes within the framework of the valorization of local materials and wastes, such as dune sand, barley straws and aggregate crushing waste. In this context, barley straws have been incorporated in a sand concrete in previous works in order to develop a new lightweight concrete and interesting results have been obtained. However a decrease in the mechanical strength and an increase in the dimensional variations have been recorded. The main objective of the present work is therefore to solve these problems. Indeed, it consists in improving the properties of the barley straws by applying different treatments before using them in order to improve the properties of the optimum composition of the studied lightweight concrete (15 kg/m3 of barley straws). Among several treatments tested, four treatments have proved effective and therefore have been selected for the continuation of this study: the hot water, the gasoil, the varnish and the waste oil. These treatments adhere well to the outer surface of the barley straw and significantly increase its tensile strength without changing much of its mass and dimensions. Introduced in the sand concrete, the straws treated with the hot water gave good improvements in the flexural strength of the composite, they did not change much its density and its thermal characteristics remained acceptable. However, the gasoil was the most effective in reducing the shrinkage of the studied concrete, but no marked improvements in the other properties have been recorded. As to the varnish, this product improved most of the characteristics of the studied concrete, but the rates of increase were lower than those recorded in other treatments. Finally, it should be noted that the waste oil gave relatively good compressive and thermal results, acceptable flexural characteristics, but a high shrinkage and density.
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J Polym Environ, 2014
ABSTRACT Biocomposites, which consist of renewable resources like proteins, have been extensively... more ABSTRACT Biocomposites, which consist of renewable resources like proteins, have been extensively investigated. However, studies on the combination of marine sediments and proteinic biopolymer have not been conducted yet. In this work, marine sediments were added to the matrix in proportions ranging from 0 to 20 %. The mechanical properties in terms of tensile, flexural and compressive strength tests were investigated. Thermogravimetric analysis were also used to assess the thermal stability of the produced composites. The hemoglobin marine sediments (HESM) may be dedicated to ground coating or to wall covering, it is then necessary to perform a preliminary structure analysis. A multi-phase mechanical model able to reproduce the compressive behavior of the HESM is developed in order to simulate the HESM coating at different marine sediments ratios and different strain rates. The incorporation of sediments increases the stiffness of the material and improves the compressive properties of the composite.
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Journal of Adhesion Science and Technology, 2016
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Revue Des Composites Et Des Materiaux Avances, 2008
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Polymer Degradation and Stability, 2008
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Polymer Composites, 2015
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Revue des composites et des matériaux avancés, 2008
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Papers by Nicolas Montrelay