Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Parcesepe, Eliana; Masi, Rosa De De Francesca; Lima, Carmine; Mauro, Gerardo Maria; Pecce, Marisa; Maddaloni, Giuseppe

doi:10.3390/ma14040882

Cited by 15 publications

(5 citation statements)

References 73 publications

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“…A similarly high water vapor transmission rate was reported, e.g., by Silva et al [68], who analyzed blended lime-hydraulic lime mortars. High water vapor permeability of lime mortars was acknowledged also by Parcesepe et al [69]. The cement-lime mortars yielded higher resistance to water vapor transport, which limits their use on masonry suffering from excessive moisture content.…”

Section: Materials ρ B (Kg•mmentioning

confidence: 89%

Zeolite Lightweight Repair Renders: Effect of Binder Type on Properties and Salt Crystallization Resistance

et al. 2021

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Rendering mortars with lightweight zeolite aggregates were designed and tested. The effect of the type of binder used was also researched. For the hardened mortars, macrostructural parameters, mechanical characteristics, hygric and thermal properties were assessed. Specific attention was paid to the analysis of the salt crystallization resistance of the developed rendering mortars. Quartz sand was fully replaced in the composition of mortars with zeolite gave materials with low density, high porosity, sufficient mechanical strength, high water vapor permeability and high water absorption coefficient, which are technical parameters required for repair rendering mortars as prescribed in the WTA directive 2-9-04/D and EN 998-1. Moreover, the zeolite enhanced mortars exhibit good thermal insulation performance and high sorption capacity. The examined rendering mortars were found to be well durable against salt crystallization, which supports their applicability in salt-laden masonry. Based on the compatibility of the repair materials with those originally used, the lime and natural hydraulic lime zeolite mortars can be used as rendering mortars for the repair of historical and heritage buildings. The cement-lime zeolite render is applicable for repair purposes only in the case of the renewal of masonry in which Portland cement-based materials were originally used.

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Section: Materials ρ B (Kg•mmentioning

confidence: 89%

Zeolite Lightweight Repair Renders: Effect of Binder Type on Properties and Salt Crystallization Resistance

et al. 2021

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“…Previous studies have shown the thermo-mechanical performance of hemp concrete [20][21][22][23][24][25][26] with the limitations of being a non-structural material [27][28][29][30], but at the same time, it excels when it comes to heat transfer and the thermo-regulating capacity of ambient humidity, which makes it recognised as a very good thermal insulation material with a decisive role in increasing the hygro-thermal performance of sustainable constructions [31][32][33]. The fact that it is obtained from natural sources as a by-product of agricultural activities qualifies it in the race for the best products with potential in the circular economy [34] while contributing to the reduction of carbon emissions [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete

et al. 2023

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The meaning of technological progress is to produce economic development and to increase the level of personal comfort. Sustainability can only be achieved if, at the microsystem level as well as at the macrosystem level, the secondary effects of the activities undertaken by people on the environment are in a state of neutrality compared to the impact they can produce on natural conditions. This neutrality can be intrinsic or can be achieved through coercive and compensatory measures. If we take into account the production of carbon dioxide that accompanies a product from the stages of conceptualisation, design, procurement of materials, execution, operation, maintenance, decommissioning and recycling the waste produced at the end of use, then nothing can be sustainable in pure form. Nevertheless, there are products whose production, both as a raw material and as a technological process, can be neutral in terms of carbon emissions. Moreover, they can even become carbon negative over time. This is also the case with eco-sustainable hemp concrete, whose capacity to absorb carbon dioxide starts from the growth phase of the plant from which the raw material is obtained and continues throughout the existence of the constructed buildings. Not only does it absorb carbon dioxide, but it also stores it for a period of at least 50 years as long as the construction is guaranteed, being at the same time completely recyclable. However, in order to obtain an optimal mixture from the point of view of raw material consumption, represented by industrial hemp wood chips and the binder based on lime and cement, multiple experiments are necessary. The study presented in this work is based on the use of an advanced method of experimental planning (design of experiments method), which makes possible the correlation between the values obtained experimentally and the algorithm that generated the matrix arrangement of the quantities of materials used in the recipes. This approach helps to create the necessary framework for parametric optimisation with a small number of trials. Thus, it is possible to obtain the mathematical law valid within the minimum and maximum limits of the studied domain that defines the characteristics of the material and allows the achievement of optimisation. The material is thus designed to satisfy the maximum thermal insulation requirements that it can achieve depending on a certain minimum admissible compressive strength.

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“…All sorts of organic materials available in given geographic regions are utilized as a main layer of a wall or they are added to plaster mortars, where a small amount of the additive introduced in the form of organic fibers may significantly improve the thermal insulation and strength parameters [24]. Another example for improvement of the heat transfer coefficient and thermal inertia of lime mortars is application of the additive in the form of iron (III) oxide [25].…”

Section: Introductionmentioning

confidence: 99%

The Fire Resistance and Heat Conductivity of Natural Construction Material Based on Straw and Numerical Simulation of Building Energy Demand

et al. 2022

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The motivation for research to help address climate change is a continuous process of searching for eco-friendly materials in the building industry, which will allow minimizing the negative impact of this sector on the environment. The main objective of the paper is to assess the properties of a natural resource such as straw as an eco-friendly material in various variants for use in low-energy demand construction. The research results will fill the knowledge gap in the field of numerical analyses of the energy demand of straw material buildings based on the results of the conducted laboratory tests. A test of a heat transfer coefficient was conducted with different orientation of straw stalks. Then, samples were subject to a fire resistance test to determine material behavior at 1000 °C. During the fire resistance test, the clay-based plaster was ‘burnt out’, which hardened its structure, effectively preventing flames from reaching the insulation layers in the form of straw stalks. As a result of shrinkage (no plaster mesh), the plaster cracked and turned brick-red in color. The insulation layer of straw under the plaster was charred to a depth of 3.0 mm due to the high temperature. However, when the torch was turned off, no fire spread was observed in any layer of the sample. The 3D models of the buildings were created for different eco-friendly materials applied to make external walls. The results of numerical simulation allowed determining the amount of final energy needed to heat the designed building at the level of 26.38 (kWh/m2·year). Conclusions of the above-mentioned tests indicate very good thermal insulating properties determined using the lambda coefficient of 0.069 (W/m·K) and the possible application of straw bales as an alternative for conventional construction. Research has proven that it is possible to construct a building with low energy requirements using natural, easily available waste and completely biodegradable material.

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Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Cited by 15 publications

References 73 publications

Zeolite Lightweight Repair Renders: Effect of Binder Type on Properties and Salt Crystallization Resistance

Zeolite Lightweight Repair Renders: Effect of Binder Type on Properties and Salt Crystallization Resistance

Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete

The Fire Resistance and Heat Conductivity of Natural Construction Material Based on Straw and Numerical Simulation of Building Energy Demand

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