Soundproofing Properties Research Articles

Developing and testing systems for the attenuation of ships' machinery noise

With ships operating in areas including important marine biodiversity, it is crucial to understand the sources and characteristics of underwater noise and develop effective measures to mitigate underwater noise's impact on the environment. The underwater noise signature from a ship is usually dominated by machinery noise and propulsion engines at low speeds. Given the importance of onboard electrical power, diesel generators might continuously function (i.e., even when a ship is docked) and generate low-frequency underwater noise. Université de Sherbrooke (Sherbrooke, Canada) and Innovation Maritime (Rimouski, Canada) lead a collaborative work focusing on the means and methods for attenuating machinery noise. Two main research axes are considered. The first concerns the setup and validation of a small-scale platform that can be used to test noise reduction methods in a controlled water basin environment. The second research axis investigates passive, tunable, and possibly multi-resonant vibroacoustic solutions to attenuate machinery noise. These solutions mostly come as 3D-printed folded quarter-wave resonators following spiral or cantilever resonators. Acoustic resonators can also be embedded into a layer of sound-absorbing material to improve soundproofing properties at specific frequencies. The applications and scope of this work are finally put into perspective.

Effects of interior doors on the audibility of fire alarms

One of the most important purposes of installing fire alarm systems is to provide an alarm signal in the protected building in the event of a fire. Fire alarms are most often provided by networked audible warning devices. The signal must be easily and quickly detectable and identifiable so that the occupants inside can start to escape after the alarm has been sounded. This is apparently a simple expectation, but if you look at the efficiency of fire alarms as a whole, and the effects that determine whether an evacuation will occur in response to an alarm during an actual fire, the question is not so simple anymore. In this article, we will examine the circumstances that may affect the alarm signal. Among these aspects, we will focus on the soundproofing properties of building structures, including interior doors, and their effect on sound propagation. By carrying out on-site measurements, we verify the design principles used in engineering practice, looking for the factors that may influence efficiency of the fire alarms in today’s construction environment. We hypothesise that the increase in sound insulation of certain building materials and structures has an increasingly negative effect on the audibility of fire alarm signals.

Soundproofing properties of open- cell microcellular polyurethane foam containing styrene-grafted polyester polyol

Both soundproofing and mechanical strength present significant challenges in the context of sound-insulating materials. Herein, to take advantage of higher intermolecular interactions of ester groups, a soundproofing open-cell Microcellular Polyurethane Foam (MPUF) was developed using polymer-grafted polyester polyol (POP) and saturated polyester polyol. The POP was synthesized by grafting polystyrene on unsaturated polyester polyol (UNPES) in a saturated polyester polyol media. The amount of styrene monomer and UNPES were changed and the POP with optimum properties was selected. The successful synthesis of POP was approved by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR), and gel permeation chromatography (GPC). The spherical morphology of selected POP with a diameter of about 500 nm was confirmed by scanning electron microscopy (SEM) and dynamic light scattering (DLS) analysis. MPUFs containing different amounts of POP (10, 30, 50, and 100 %) as polyester polyol parts were prepared. It was found that mechanical properties including tensile strength: 3500 KPa, elongation at break%: 350% and soundproofing properties with acoustic activity of 0.72 were obtained when the POP content of the MPUF was fixed at 30%. The cell-opening behavior of POP in polyester-based MPUF was studied using SEM. It was found that the average of the open cells’ size and their population were increased as the POP content increased. Such MPUFs can be effective in successful mechanical and acoustic damping in the automotive industry.

Bench Studies of Sound Insulation Materials and Vacuum Sound Insulation Panel

There is a problem of protection from high-level sound of city residents, employees of enterprises; to a greater extent, in the workshops of machine-building factories, for example, during stamping, forging and other metalworking processes. Specialists and maintenance personnel are exposed to high-intensity noise near powerful agitators, pumps, engines and other power equipment. Due to these circumstances, it is necessary to constantly improve systems, devices, materials, coatings that reduce the negative impact of high noise levels on people. For this purpose, various soundproof walls, panels, screens, plates are being developed. One of the directions of modernizing sound-proofing fences is the method of using vacuum to design these protective devices. The article discusses the use of vacuum in special sound-insulating panels developed by the authors. The information about bench experimental studies of some sound-proofing materials is given, some results of testing of vacuum soundproofing panels are presented. The research stand and research methodology are described. The features of the stand for the study of sound-proofing properties of flat samples of sound-proofing materials of the same size and thickness are given.

RESEARCH OF ACOUSTIC PROPERTIES OF MATERIALS FOR FOUNDATIONS UNDER THE FLOOR

The most important components of comfortable conditions for people on the premises of residential and public buildings are thermal (temperature) and acoustic comfort. By the regulatory documents of Ukraine, high requirements are imposed on the thermal and sound insulation qualities of external and internal building envelopes, especially on interfloor floors. While the problem of insufficient thermal protection primarily concerns floors over cold basements and passageways, poor sound insulation of floors is a problem for all apartments in high-rise buildings. This article analyzes the causes of acoustic discomfort in buildings. A person indoors is exposed to three types of noise: airborne, impact, and structural. The most difficult problem to solve is an impact noise through the floors. It is emphasized that despite the different noise sources, the mechanisms of propagation of structural and impact noise are similar ‒ through the structural elements of the building. Therefore, measures to reduce impact noise can simultaneously reduce the level of structural noise. The most common methods of reducing sound transmission through floors are analyzed. It is proposed to replace the conventional screed in the floor structure with a heat and sound-insulating screed based on a gypsum-cement-pozzolana binder. This paper considers only an acoustic aspect of the problem. According to the theory of acoustic dissipation, it is assumed that the effect of sound energy dissipation is enhanced by the introduction of aggregates into the mixture, which increases the number of structural heterogeneities and interfaces. The aggregates used in the mixture are expanded polystyrene granules, cork chips, and granular waste from the production of foam glass. In order to experimentally verify this assumption, laboratory methods and devices were developed for a comparative assessment of the soundproofing properties of the developed compositions. Based on the results of measuring the acoustic properties of the prototypes, experimental and statistical (ES) models were constructed, and the best combinations of mixture components were determined in terms of sound insulation. ES models of noise properties were used in the multi-criteria optimization of the composition of the composite mixture.

From Bioresources to Thermal Insulation Materials: Synthesis and Properties of Two-Component Open-Cell Spray Polyurethane Foams Based on Bio-Polyols from Used Cooking Oil.

Open-cell spray polyurethane foams are widely used as highly efficient thermal insulation materials with vapor permeability and soundproofing properties. Unfortunately, for the production of commercial foams, mainly non-renewable petrochemical raw materials are used. The aim of this study was to determine the possibility of completely replacing petrochemical polyols (the main raw material used in the synthesis of polyurethanes, alongside isocyanates) with bio-polyols obtained from used cooking oils, classified as waste materials. The research consisted of three stages: the synthesis of bio-polyols, the development of polyurethane foam systems under laboratory conditions, and the testing of developed polyurethane spray systems under industrial conditions. The synthesis of the bio-polyols was carried out by using two different methods: a one-step transesterification process using triethanolamine and a two-step process of epoxidation and opening oxirane rings with diethylene glycol. The obtained bio-polyols were analyzed using gel chromatography and nuclear magnetic resonance spectroscopy. The developed polyurethane foam formulations included two types of fire retardants: halogenated tris(1-chloro-2-propyl) phosphate (TCPP) and halogen-free triethyl phosphate (TEP). In the formulations of polyurethane systems, reactive amine catalysts were employed, which become incorporated into the polymer matrix during foaming, significantly reducing their emission after application. The foams were manufactured on both a laboratory and industrial scale using high-pressure spray machines under conditions recommended by commercial system manufacturers: spray pressure 80-100 bar, component temperature 45-52 °C, and component volumetric ratio 1:1. The open-cell foams had apparent densities 14-21.5 kg/m3, thermal conductivity coefficients 35-38 mW/m∙K, closed-cell contents <5%, water vapor diffusion resistance factors (μ) <6, and limiting oxygen indexes 21.3-21.5%. The properties of the obtained foams were comparable to commercial materials. The developed polyurethane spray systems can be used as thermal insulation materials for insulating interior walls, attics, and ceilings.

Sound Absorption of Tufted Carpets Produced from Coarse Wool of Mountain Sheep

ABSTRACT Coarse wool from Polish mountain sheep, often treated as a useless by-product of sheep husbandry, was used to produce pile carpets with tufting technique. Raw wool was used in the small-scale spinning mill to spin prototype rug yarns, which were then used for the production of carpets. The carpets with cut and loop piles of two different heights and densities were manufactured. During examinations, the basic parameters of raw wool, yarns, and tufted fabrics were determined. Then, the soundproofing properties of carpets were analyzed. To characterize the acoustic properties of the carpets, the sound absorption coefficient and transmission loss were measured. The measurements were carried out in one-third octave bands in the frequency range of 80–5000 Hz using the impedance tube method. It was stated that the wool of Polish mountain sheep is coarse, highly differentiated both in thickness and length and contains a significant content of medullated fibers and kemp. Despite its poor characteristics, the wool can be used for the production of rag yarns suitable for the production of pile carpets with tufting technique. The carpets possess acceptable sound absorbing capacity comparable to other similar products obtained from other wool types, which is dependent on both pile types and their parameters. The carpets exhibit low transmission loss, which is influenced, to a lesser extent, by the change in the parameters of the pile layer.

RESEARCH OF ENERGY EFFICIENT SOLUTIONS FOR HEAT INSULATION OF CONSTRUCTIONS AND PIPELINES WITH AEROGEL

Ways of energy saving in buildings, namely compliance with the regulatory framework of European standards, possibilities to reduce heat losses during energy transportation through pipelines on the example of heating systems and reducing heat losses during the operation of buildings and structures are studied in the article. It was found that, despite the regular updates of the State Construction Norms of Ukraine, the coefficient of thermal conductivity of insulation materials is not brought into line with generally accepted European standards. The second part of the article presents the results of analytical studies of various thermal insulation materials that are widely used in the territory of Ukraine. After comparing the results, we concluded that the most common at this stage of development of insulation materials will not fully satisfy all the requirements, which must meet all the materials for insulation of structures. The use of some materials is impossible of thermal insulation of structures and pipelines with complex configuration. The solution of energy efficiency along with increasing soundproofing properties, reducing the fire hazard, reducing the load on the bearing structures of buildings and structures is possible through the use of aerogel as a thermal insulation material. The material is characterized by low dependence of the thermal conductivity coefficient on changes in ambient temperature, which makes it the best option for use in harsh operating conditions. After analytical studies of various insulating materials, it was found that aerogel in roll in addition to low coefficient of heat transfer is characterized by better operating properties, namely, non-combustibility of the material, environmental safety, light weight, which reduces the burden on the structure, ease of installation, the possibility of using the structures with high rate of sound insulation.

A Study on Fire Retardant and Soundproof Properties of Stainless Steel EAF Reducing Slag Applied to Fiber Reinforced Cement Boards.

In recent years, cases of the improper utilization of steel furnace slag have been widely reported, resulting in a crisis of nowhere for recycled resources such as inorganic slag. The misplacement of resource materials that originally had sustainable-use value not only has a great impact on society and the environment but also greatly reduces industrial competitiveness. To solve the dilemma of steel furnace-slag reuse, it is critical to find solutions to the stabilization of steelmaking slag under the innovative thinking of the circular economy. In addition to enhancing the reuse value of recycled resources, the balance between economic development and environmental impact is also crucial. The high-performance building material could provide a solution based on a high-value market. With the development of society and the increasing requirements for quality of life, the requirements for the soundproof and fireproof performance of lightweight decorative panels common in cities have gradually become popular. Therefore, the high performance of fire retardant and soundproofing could be the main development focus of high-value building materials to ensure circular economic feasibility. This study continues the research results of the application of inorganic re-cycled engineering materials in recent years, and the application of electric-arc furnace (EAF)-reducing slag to the development of base materials for reinforced cement boards, in order to complete the development of high-value panels with fireproof and sound-insulation properties in line with the engineering characteristics of the boards. The research results showed the optimization of the proportions of the cement boards with EAF-reducing slag as a raw material. The proportions of EAF-reducing slag to fly ash at ratios of 70:30 and 60:40 all met the requirements of ISO 5660-1 Class I flame resistance; the sound transmission loss in the overall frequency band can reach more than 30 dB, which is higher by 3-8 dB or more than the same board with similar specifications (such as 12 mm gypsum board) in the present building-materials market The products could be developed into building partitions and ceiling decoration boards with high performance in terms of fire retardant and soundproofing values, and also reduce the use of natural raw materials by more than 35%. The results of this study could meet environmental compatibility targets and contribute towards greener buildings. This model of circular economics would achieve energy reduction, emissions reductions, and be environmentally friendly.

Bionic design and numerical studies of spider web-inspired membrane-type acoustic metamaterials

Being demonstrated to have excellent soundproof properties, Membrane-type acoustic metamaterials (MAMs) have been extensively investigated. Inspired by a spider web, this study designed a bionic MAM by combining a membrane, frame, and set of resonators. The computational and experimental results show that the bio-inspired model has a 19 % reduction in mass and 61 % expansion in bandwidth. Furthermore, we investigated the laws of three design parameters— membrane shape, resonator position and model size—of the structure soundproof performance and analyzed its multi-state anti-resonance modes. The results show that the round model performed better than other two square models on soundproof performance. The best soundproof performance was achieved when the resonator was positioned at a radius ratio of 0.54. The model still has a substantial noise reduction at reduced size but the risks of failure when size increases. These studies will generate fresh insight into producing more efficient low-frequency sound insulation materials.

ARCHITECTURAL AND LANDSCAPE SOLUTIONS TO PROTECT THE TERRITORY FROM TRAFFIC NOISE ALONG TRANSPORT HIGHWAYS

Based on the review of research works, it was established that the noise load from moving transport units affects the health of people, which requires the development of effective design and planning solutions to reduce the noise load on residential areas. It was established that the noise-absorbing structure consisting of a metal sheet and sheet glass has high acoustic properties. Because glass absorbs sound energy in a wide range of frequencies, and what is especially important – even in the low frequency range. At the same time, the acoustic properties do not depend on the influence of the environment: dust, snow and moisture. The entire structure of the screen has high soundproofing properties. The combination of both these properties (sound-absorbing and sound-insulating) enables this screen to effectively protect residents of residential buildings from traffic noise. It has been established that architectural and landscape solutions to protect areas from noise pollution from vehicles significantly reduce the noise level. A significant reduction in the noise load is observed behind the house. However, the use of architectural and planning methods for noise protection are not always effective methods of protecting residential areas from noise pollution. Since there are areas where buildings have already been built, or are being built, without taking into account noise. In addition, the area of land plots in urban conditions is limited, which sometimes prevents the full implementation of architectural and landscape solutions. It has been established that the most effective ways to protect agricultural land from traffic noise are the construction of screen houses along transport highways. The amount of noise behind the house decreases to 23 dBA compared to the noise level on the transport highway. Noise maps are used to identify the noise regime in the built-up area as a whole and in individual sections of microdistricts, which are curves of equal levels plotted on the plan diagram, they characterize the decrease in noise level when moving away from the highway.

Application of sawdust concrete in construction

Sawdust concrete is a type of lightweight concrete in which some of the mineral aggregate is replaced by sawdust - a by-product of wood processing. It is not a new material, but its potential is not utilised to its full degree. Taking into account the most important advantages of sawdust concrete - lower density and greater thermal and acoustic insulation than ordinary concrete - it is worth to consider the possibilities of its usage in construction wider than currently . In order to present the properties of sawdust concrete, the review of contemporary technical literature has been performed.&#x0D; For the production of sawdust concretes mineralized sawdust from various types of trees, ordinary cements, mineral aggregates and water, are used. The usage of additives and admixtures is also allowed. The properties of the finished sawdust concrete are mainly influenced by the proportion of its components, especially the amount of fine aggregates replaced by sawdust. The construction products made of sawdust concrete are characterized by a low coefficient of thermal conductivity λ and soundproofing properties. In bending tests, a simply supported sawdust concrete beam behaves similar to a regular concrete beam, cracks first appear in the tension zone. Tensile strength, compressive strength and Young's modulus of sawdust concrete products depend on the proportion of components and the method of sawdust preparation before applying in the sawdust concrete-mix. Compared to ordinary concrete, the obtained values for sawdust concrete are lower, but partially fall within the ranges for the lower classes of ordinary concrete.&#x0D; There are several possible applications of sawdust concrete in construction. One of the perspectives is to use it to build walls in buildings that require soundproofing between rooms, or to replace wood with it when renovating old buildings. However, further tests of sawdust concrete are needed in terms of the most favourable composition for its mechanical properties, and to define the standards according to which sawdust concrete elements should be produced.

NBR/CR‐Based High‐Damping Rubber Composites Containing Multiscale Structures for Tailoring Sound Insulation

AbstractHigh‐damping acoustic composites with unique sound insulation feature is reported, demonstrating surprisingly stable soundproof properties over a wide bandwidth of frequency (63–6300 Hz) with good mechanical properties. The extraordinary acoustic properties are attributed to the multiscale synergy of lamellar and hollow structures by multifillers adding. The acoustic composites are designed and fabricated through a low‐temperature one‐time rubber mixing process using nitrile butadiene rubber(NBR), chloroprene rubber (CR) as matrix and mica powder (MP), hollow glass beads (HGB), and montmorillonite (MMT) as multifillers. The soundproof mechanism is discussed in detail. Results indicate that the synergism of damping and sound absorption behaviors in the composition has a considerable impact on the acoustic characteristics, which can be controlled by the blending ratio of NBR/CR matrixes and the multiscale structures of MP/HGB/MMT multifillers. The designed multifillers acoustic composites can adapt to broadband engineering noise control including walls in express train constructions, panels of vessel or aircraft cabins, and large transportation pipelines.

Research on Obtaining Biocomposite Structures with Sound Absorbing Properties

The paper addresses the methodology for obtaining biocomposite structures from waste, with sound-absorbing properties, such as: thuja shells, walnut shells, pistachio shells, beech sawdust, pumpkin seeds shells and sunflower seeds shells. The experimental analysis carried out considers the study of the sound-absorbing properties held by the proposed new biocomposite materials, by determining the value of the sound absorption coefficient, reflection coefficient, impedance ratio, using the Kundt tube. The interpretation of the results obtained from the evaluation of biocomposites shows that they have sound-absorbing properties. Consequently, sound-absorbing panels with soundproofing properties can be made from these materials, which can be used in industry, transportation, construction, etc. as well as for decorative purposes in spaces such as cinemas, malls, spas, etc.

Characterization of CaCO3 Filled Poly(lactic) Acid and Bio Polyethylene Materials for Building Applications.

Noise pollution has been identified as a cause of a broad spectrum of diseases, motivating researchers to identify building materials capable of attenuating this pollution. The most common solution is the use of gypsum boards, which show a good response for low frequencies but have a poorer response for high frequencies. In addition, due to environmental concerns associated with buildings, the use of materials that minimize environmental impacts must be favored. In this research, two biopolymers, a poly(lactic) acid and a bio-polyethylene, were filled with two typologies of calcium carbonate, and their soundproofing properties were tested using impedance tubes. In addition, the morphology of the fillers was characterized, and here we discuss its impact on the mechanical properties of the composites. The results showed that the incorporation of calcium carbonate into bio-based thermoplastic materials can represent a strong alternative to gypsum, because their mechanical properties and sound barrier performance are superior. In addition, the inclusion of mineral fillers in thermoplastic materials has a positive impact on production costs, in addition to preserving the advantages of thermoplastics in terms of processing and recycling. Although the use of carbonate calcium decreases the mechanical properties of the materials, it enables the production of materials with insulation that is four-fold higher than that of gypsum. This demonstrates the potential of these materials as building lightweight solutions.

The Study of Creep and Deformation Properties of Sulfur-Containing Arbolit Exposed to Various Compression Stresses

The present paper considers the study of creep and deformation properties of sulfur-containing arbolit exposed to various compression stresses. Investigating the creep of lightweight arbolit concretes greatly affecting the performance of bearing and envelope structures draws a special attention during the last years. This issue is of particular relevance in the regions with hot and sharp continental climate. Arbolit concrete is one of the lightest building materials with low thermal conductivity and good soundproof properties. The modern postulates of theory and practice of creation, development of high-strength arbolit concretes on the base of composite sulfur-containing binders have become the methodological framework of the present research. While carrying out scientific research, the following standard measuring and analysis methods of physical and mechanical properties have been used for sulfur-containing arbolit composites. Experimental tests have been implemented on the 28-days samples made of sulfur-containing arbolit, with the cotton plant footstalks as an organic component. The researched samples were vapor sealed with the purpose to eliminate overlapping the processes of contraction and creep. The experimental results have shown that the analysis of prisms deformation in time demonstrates certain derivation from the pattern. Deformation of prisms made of sulfur-containing arbolit loaded at the low stress level were growing at a slower rate that the same deformations at a higher stress level. No derivation has been observed for the prisms of sulfur-containing haydite concrete. For both types of concrete, creep deformation has reached the values exceeding completely recoverable deformation by a factor of 2 or all the samples, the rapid growth of creep deformation has been observed after loading, followed by the gradual slowdown of deformation growth. For sulfur-containing lightweight concretes, as the test shown, the rate of creep deformation growth depends on the hardening curve in time reflecting the process of concrete hardening. This, if compared with sulfur-containing lightweight concretes, creep of sulfur-containing arbolit concrete is significantly lower that eventually leads to the loss of creep deformation at the same stress level. The obtained results can be used when manufacturing an efficient wall material for residential construction, including seismic areas.

Method of Automated Research of Sound-Proofing Building Materials

There is a problem of effective organization and conducting experimental research in special situations. In scientific research, it is not uncommon to perform long and time-consuming experiments, when one experiment takes a relatively long period of time, when a complete factor plan of experiments is needed. The article describes an approach to organizing and conducting experimental studies of building materials on an automated stand with software control. An example of a stand for studying the sound-proofing properties of flat samples of b The authors have shown that automation of the experimental research process increases the accuracy and reliability of research results; expands the boundaries of research and provides an opportunity for preliminary evaluation of primary results with further adjustment of the research plan.uilding sound-proofing materials is given.The method under consideration can be the basis for various experimental studies on stands that perform research according to a given program.

Transparent broadband microwave metamaterial absorber with thermal insulating and soundproof

Nowadays, multi-functional materials are desperately required for adapting the complex environment, which urges us to take more factors into consideration. Here, we proposed a broadband microwave absorber with multi-functionality such as optically transparent, thermal insulating and soundproof properties. Using indium tin oxide (ITO) based metamaterial, the device can achieve above 90% microwave absorption from 5.6 GHz to 23 GHz (cover X and Ku band). Moreover, with designed vacuum structure inside, the device is thermal insulating and soundproof. These multi-functional advantages give the absorber more flexibility in electromagnetic shielding and stealth application, which can be potentially applied in windows related industry.

Soundproofing materials in construction using polymer composites

Today, obtaining products for recycling of polymer materials is of great interest, including for the construction industry. At the same time, not only new materials are created with the specified performance characteristics, but also the environmental problem is solved, nature is preserved and natural resources are saved. In this paper, it is proposed to use a fabric cord of used tires as a component of soundproofing material. Various types of latex were used as a binder: acrylic, natural, and styrene-butadiene. It was found that all the obtained composites have soundproofing properties. The best soundproofing properties are found in a material containing styrene-butadiene latex. Thus, it is shown that materials based on latex of various nature and textile products of tire processing can be used for soundproofing materials in the construction industry.

The study of structure formation and mechanical strength properties of sulfur-containing woodcrete composites exposed to permanently acting loads

The present paper considers the issues of mutual neutralization and toxicity elimination of toxic components of industrial by-products as well as the study of strength formation for sulfur-containing woodcrete composites exposed to various permanently acting loads and curing conditions in time. Woodcrete-concrete composites could be considered as one of the available lightweight heat insulating building materials with low heat conductivity and good sound proofing properties. The materials are based on recyclable raw materials widely available in the regions of Kazakhstan and Russia. The contemporary provisions of theory and practice of development of efficient lightweight woodcrete-concrete on the base of composite sulfur-containing binders obtained by the method of toxicity elimination and mechanochemical activation served as the methodological foundation of the research. While implementing scientific research, the authors used the standard measuring instrumentation and methods of analysis of physical and mechanical properties of woodcrete composites such as the up-to-date methods of X-ray diffraction analysis, differential thermal and microscopic analyses and testing equipment. The principle of mutual neutralization of toxic components of industrial by-products by means of mechanochemical treatment at low temperature has been applied in the paper. These methods allow reducing cement content due to its fractional replacement by industrial waste. For the experimental part of the research, ferrous iron with the oxidation number 3 (Fe2O3) has been used as the oxidizing agent, while elemental sulfur, wood coal dust and ferrous iron with the oxidation number 2 (FeO) have demonstrated regeneration properties. The properties of sulfur-containing woodcrete specimens have been studied after 7, 28 and 90 days of exposure in various curing conditions. It was stated that sulfur-containing woodcrete had been fractioned gradually, first, decomposition of mortar constituent part took place, then of organic filler fibers. The obtained results could be applied while manufacturing efficient walling material for civil engineering buildings and structures, including seismic areas.