Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw

Babenko, Maryna; Estokova, Adriana; Unčík, Stanislav; Savytskyi, M. V.

doi:10.2478/sjce-2022-0023

Slovak Journal of Civil Engineering

2022

DOI: 10.2478/sjce-2022-0023

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Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw

Maryna Babenko

Adriana Estokova

Stanislav Unčík

et al.

Abstract: The article presents the results of a study involving the properties of flax and hemp-based lightweight concretes as well as the initial characteristics of different straw-based materials. A comparison of straw-based lightweight concretes with and without ordinary Portland cement (OPC) showed that hemp concrete has a 5.6 % higher strength at a 10% deformation, and at the same time, has a 13% greater thermal conductivity coefficient than flax concrete. The physical-chemical study based on a thermal analysis in … Show more

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Cited by 4 publications

References 16 publications

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Complex Study of the Composite Building Material Based on Flax Straw Organic Waste: Hygrothermal and Physicochemical Properties

Cerny,

Babenko,

Bartos

et al. 2023

Waste Biomass Valor

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The focus of this study is on the hygrothermal and mechanical properties of the elaborated insulating composite based on flax straw. Flax straw is considered as an agricultural waste of organic origin, which has a high sorption capacity and a low thermal conductivity potential due to its natural porosity. Investigations on sorption moisture, thermal conductivity and mechanical properties under laboratory conditions have allowed us to develop a perspective building material suitable for use in ‘green’ construction, especially in rural areas, due to the relative accessibility of the base component. Liquid glass is proposed as a binder. The optimal composition of the filler and binder, sorption moisture, thermal conductivity and surface mapping of the proposed material were investigated. The thermal conductivity reached a minimum value of 0.0728 W m−1 K−1 at relative humidity of 50% during desorption, which is highly competitive to the values for conventional insulation materials on an organic basis. The binder was visually distributed evenly over the surface according to the SEM analysis. Corresponding to the spectral analysis by chemical elements, Na and SiO2 in total showed 17.69% quantity volume on the composite surface of 2–5 μm in depth. Graphical Abstract

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Complex Study of the Composite Building Material Based on Flax Straw Organic Waste: Hygrothermal and Physicochemical Properties

Cerny,

Babenko,

Bartos

et al. 2023

Waste Biomass Valor

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show abstract

Effective wall structures with use of flax straw concretes

Novosad¹,

Marushchak²,

Pozniak³

2023

Theory build. pract.

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The modern building technologies are technologies of green construction, near zero-energy and active buildings with bioclimatic design, optimized energy consumption and CO2 emissions. Prospective enclosing structures of such buildings are structures using available, low cost, and environmentally friendly materials based on plant raw materials. In this paper the evaluation of technical solutions of wall enclosing structures using flax concrete based on lime binder with a density of 300-350 kg/m3 was carried out, taking into account their heating and cooling loads in residential buildings. It is shown that the provision of the necessary indicators of the external walls of energy-efficient buildings is achieved by using multilayer structures with a heat-insulating layer of flax straw concrete or a single-layer structures made from flax straw concrete in frame construction technology.

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Physical-Mechanical and Durability Properties of Concrete with Lightweight Artificial Aggregate Produced by Controlled Self-Burning of Waste Coal Tailings

Stehlík,

Batelka,

Heřmánková

et al. 2024

Slovak Journal of Civil Engineering

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The goal of this research focusing on the burning of coal tailings to produce a lightweight artificial aggregate is to compare the physical-mechanical and durability properties of concrete containing this new type of artificial aggregate with those of the reference concrete. The following parameters are measured on all the samples: compressive strength, volume mass, the static modulus of elasticity in compression, the frost resistance of this new type of concrete, and the resistance to CO2. All the concretes tested with the new artificial aggregate exceeded the characteristic strength values in all the strength classes monitored. The volume mass of the concrete with the new artificial aggregate is tens of percentages lower than that of the conventional reference concrete. The frost resistance of the concrete tested was reliably proven by the non-destructive resonance method. It was also found that at the lower strength classes of concrete, carbonation occurred earlier, but there was no obvious direct relation to the porosity of the new artificial aggregate. The tests performed showed that it is possible to produce high - quality concrete using a new lightweight artificial aggregate produced from coal tailings

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Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw

Cited by 4 publications

References 16 publications

Complex Study of the Composite Building Material Based on Flax Straw Organic Waste: Hygrothermal and Physicochemical Properties

Complex Study of the Composite Building Material Based on Flax Straw Organic Waste: Hygrothermal and Physicochemical Properties

Effective wall structures with use of flax straw concretes

Physical-Mechanical and Durability Properties of Concrete with Lightweight Artificial Aggregate Produced by Controlled Self-Burning of Waste Coal Tailings

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