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      Mechanical, Thermal, and Moisture Buffering Properties of Novel Insulating Hemp-Lime Composite Building Materials

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          Abstract

          Hempcrete is a sustainable biocomposite that can reduce buildings’ embodied energy while improving energy performance and indoor environmental quality. This research aims to develop novel insulating hemp-lime composites using innovative binder mixes made of recycled and low-embodied energy pozzolans. The characterization of composites’ mechanical and hygrothermal properties includes measuring compressive strength, splitting tensile strength, thermal conductivity, specific heat capacity, and moisture buffer capacities. This study also investigates the impact of sample densities and water content on compressive strength at different ages. The findings suggest that mixes with a 1:1 binder to hemp ratio and 300−400 kg/m 3 density have hygrothermal and mechanical properties suitable for insulating infill wall applications. Hence, compressive strengths, thermal conductivity, and specific heat capacity values range from 0.09 to 0.57 MPa, 0.087 to 0.10 W/m K, and 1250 to 1557 J/kg K, respectively. The average moisture buffer value for all hempcrete samples of 2.78 (gm/m 2 RH%) indicates excellent moisture buffering capacity. Recycled crushed brick pozzolan can enhance the hygrothermal performance of the hemp-lime composites. Thus, samples with 10% crushed brick have the lowest thermal conductivity considering their density and the highest moisture buffer capacity. The new formulas of hydrated lime and crushed brick have mechanical properties comparable to metakaolin and hydraulic lime formulas.

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          Most cited references 49

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          Properties and composition of recycled aggregates from construction and demolition waste suitable for concrete production

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            Mechanical and thermal properties of lime and hemp concrete (“hempcrete”) manufactured by a projection process

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              Transient hygrothermal behaviour of a hemp concrete building envelope

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                06 November 2020
                November 2020
                : 13
                : 21
                Affiliations
                [1 ]Civil Engineering Department, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada; yabde079@ 123456uottawa.ca
                [2 ]Mechanical Power Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt
                [3 ]Civil Engineering Department, University of Manitoba, 15 Gillson St., Winnipeg, MB R3T 5V6, Canada; mohammadamilkhan@ 123456gmail.com (M.A.K.); asifkhantupu@ 123456gmail.com (A.K.); mehdi17uofm@ 123456gmail.com (M.I.A.)
                Author notes
                [* ]Correspondence: mkavgic@ 123456ottawa.ca
                Article
                materials-13-05000
                10.3390/ma13215000
                7664188
                33171950
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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