Waste Wood Chips Research Articles

Syngas composition analysis for waste to methanol production: Techno-economic assessment using machine learning and Aspen plus

The yield of methanol is heavily influenced by the composition of the syngas which varies from waste type and gasification conditions. This study uniquely explores machine learning (ML) and artificial neural network (ANN) algorithms with shapley additive values (SHAP) analysis to predict syngas compositions and interpret the complexities of waste gasification. Aspen Plus is then utilized to investigate the impact of syngas compositions on the economics of methanol production. Among the different ML models, gradient boosting regression achieved remarkable accuracy in predicting carbon monoxide and carbon dioxide, while ANN excelled in predicting nitrogen and hydrogen based on the coefficient of determination (>0.95). The feature importance analysis demonstrated the gasification agent type as the most important feature. Steam gasification of waste sawdust, straw, and wood chips showed the highest methanol yield. Economic analysis indicated the lowest levelized cost of methanol (LCMeOH) to be 1195.79 USD/MT which further decreased to 933.97 USD/MT upon hydrogen addition. Uncertainty analysis using Monte Carlo method showed the possible minimum LCMeOH to be 254.05 USD/MT. This study provides a comprehensive picture of the economic viability of waste-to-methanol production and provides an important reference for stakeholders on a global scale to quickly assess the feasibility of waste-to-energy projects.

Study on synergistic effect of co-pyrolysis of wood chips and its gasification tar on the biochar and subsequent activated carbon upgrading using response surface method

Wood processing and gasification produce large amounts of waste wood chips and tar separately. The utilization of these wastes is highly significant for the comprehensive utilization of wood. In this study, waste wood chips and tar were used as raw materials and the characteristics of biochar and activated carbon obtained using a two-step process (co-pyrolysis followed by activation), were investigated. On the basis of response surface methodology, the comprehensive effects of the three co-pyrolysis factors (proportion of tar, pyrolysis temperature, and residence time) on the properties of biochar and activated carbon were studied. Results showed that there was synergistic effect between waste wood chips and tar during co-pyrolysis. A lower biochar yield was obtained from pyrolysis of tar (25.5%) and wood chips (24.7%) alone, as compared to that of biochar (27.1%) obtained by co-pyrolysis. Additionally, the activated carbon produced by co-pyrolysis (1280 m2/g) had higher specific surface area (SBET), as compared to that produced by pyrolysis of tar and waste wood chips alone. Regression equations were established for the co-pyrolysis conditions with the properties of biochar and activated carbon. The trends for the three experimental conditions were intuitively shown by the 3D response surface diagrams, which facilitated the utilization of waste wood chips and tar.

Gasification of organic solid waste for syngas: Physicochemical and conversion mechanism investigation

The syngas of organic solid waste (OSW) obtained through gasification is of great interest in energy and fuel production owing to its clean and environmentally friendly characteristics. In this study, the physicochemical properties of typical OSW were systematically studied, and the mechanism of the influence of OSW sample structure and composition on gasification behavior was studied by thermogravimetric mass spectrometry and gasification experiments. Scanning electron microscopy was used to observe the surface morphology of the samples, showing that waste wood chips (WWC) and Pennisetum giganteum (PG) have well-developed pore structures. Fourier transform infrared spectroscopy results indicated that polyurethane foam (PF) and polyethylene terephthalate (PET) have more oxygen-containing functional groups than WWC and PG. X-Ray diffraction showed that the order of crystallinity index was WWC > PET > PF > PG. X-ray photoelectron spectroscopy results showed the order of the surface alkali content was PG > PF > WWC. Furthermore, thermogravimetric and mass spectrometry experiments were used to explore the components released from volatiles during heating, demonstrating that WWC and PG produce mainly H2O, while PF and PET produce mainly CO2. Gasification experiments were carried out at different heating rates, and PET had the highest initial and final gasification temperatures. The distributed activation energy model was used to calculate the apparent activation energy, which was in the order WWC (153.7 kJ/mol) > PET (136.9 kJ/mol) > PG (81.2 kJ/mol) > PF (78.9 kJ/mol) and was consistent with the carbon ordering degree result.

PRIMARY WOOD PROCESSING IN KYIVAN RUS’ (based on materials from the Middle Dnipro area)

The paper deals with the initial stages of wood processing — the selection and primary processing of raw materials. Wooden artifacts used in this work include not only completed wood products but also waste (wood chips, fragments with traces of tools, shavings, etc.). The analysis of the woodworking raw material base also involves the use of natural science methods to identify the wood species that formed its basis.
 The selection of raw materials requires the selection of wood that is technically suitable for each type of product. This is primarily achieved by selecting wood species with the appropriate qualities. An oak wood is most often recorded as a building material but this applies mainly to lower logs of the fortifications and for various engineering structures. For residential buildings made of pine wood, oak foundations are not required and are not always found. In the case of using unstable deciduous species, which were destroyed by contact with the soil, strong oak foundations were more essential. Wood with the right properties for each type of product was also used to make household utensils and other products. All identified wood, except boxwood for the combs, belongs to local wood species. The question of the possibility of using other types of imported wood, especially in connection with the manufacture of Christian worship items, remains unresolved.
 The wooden artifacts under study also indicate that high quality wood without large knots, cracks and other defects was used. There may have been some primary processing of the wood in specially selected places.
 According to literary sources, logging of building timber took place mostly in winter. Indirect evidence of winter logging can be found in the presence of a large amount of bark among the tree remains in the cultural layer «with chips» which is associated with the primary processing of wood in the north-west of Kyiv Podil. Preferring winter logging is an established practice, driven by natural factors and taking into account the biological characteristics of trees. However, in some Early Rus sites logs with bark have been found, which can be linked to summer logging.
 There are reasons to believe that some products could have been manufactured at the site of primary wood processing. Processing of blanks could also have been carried out within the settled area. This is evidenced by the discovered woodworking complexes in the settlement of Khodosivka — Roslavske and on the outskirts of Chernihiv.
 The study of all wooden artifacts obtained as a result of archaeological research, including production waste, provides additional important information about the peculiarities of local woodworking.

Optimization of Mechanical Properties of Bonded Particle Boards Produced From Agricultural Waste Wood Chips

The aim of this research work was to optimize the production of particle boards from agricultural waste (wood chips). The mechanical properties investigated were the modulus of elasticity (MOE) and modulus of rupture (MOR). The production of particle boards was investigated under the following conditions: stacking time (14-21days), resin loading (386-463 g) and amount of agro residue (154-185 g) using Box-Behnken design. Statistically significant models (p<0.05) were developed to represent the relationship between the responses (MOE and MOR) and the independent variables. Both models showed significant fit with experimental data with R2 values of 0.99 and 0.97 respectively. Analysis of variance (ANOVA) results showed that MOE and MOR were influenced by the stacking time, amount of resin and agro residue used. Response surface methodology (RSM) was used to optimize the MOE and MOR and the optimization results showed that the maximum MOE and MOR values of 1114.09N/mm2 and 9.34 N/mm2 were respectively obtained at the optimum production conditions of stacking time, resin loading and amount of agro residue (i.e. 21days, 462.82g and 185.00 g respectively). The particle board produced at the optimized conditions satisfied the American National Standard Institute ANSI/A208.1-1999 specification for general purpose particle boards.

Fabrication and mechanical properties of waste wood chips/cements composites for paving materials

In this article, cement-based wood composites (CWC) were prepared by the hydrostatic method using waste wood chips as filler material and cement mortar as the binder. The effects of wood content, wood particle size, and wood modification method on flexural strength, modulus of elasticity, and toughness were experimentally investigated. The results showed that the flexural toughness of the specimens became more pronounced with the increasing wood content and particle size, and the maximum value was 0.742. The flexural toughness of the samples reached the maximum value at 30% wood content after the wood was modified by NaOH and silane coupling agent. The changes in flexural strength and elastic modulus of the specimens were consistent, and both decreased with the increase in wood content. A positive correlation between the flexural strength of the samples and the wood particle size was observed. About 30% wood content, 5.0–10.0 mm wood particle size, and NaOH modification are recommended to prepare the composites. This research can open new avenues for the research and promotion of CWC paving materials.

Eco-friendly wood plastic composites with biomass-activated carbon-based form-stable phase change material for building energy conversion

Phase change materials (PCM) can store heat energy through the process of phase change and keep the ambient temperature in a comfortable range, thus reaching the aim of energy conservation and emission reduction. To improve the latent heat capacity, activated carbon (AC) with a dendritic pore structure was used as the carrier, and polyethylene glycol (PEG) was loaded by vacuum adsorption method. A dendritic pore structure with a nesting pattern of macropores, mesopores, and micropores was formed through the steam activation process of waste wood chips, leading to a high load capacity (70%) and uniform distribution, which showed high heat storage performance (ΔHm reached 116 J/g). Then the form-stable phase change material with satisfactory performance (AC/PEG-70) was combined with wood flour/ high-density polyethylene (WF/HDPE) through blending and hot pressing to fabricate phase change heat storage wood-plastic composite material (A-WPC). When the AC/PEG-70 content was 50%, the elongation at break increased by 167% (20%), and the rigidity of the material enhanced. ΔHm of A-WPC-50 was 19 J/g, undoubtedly at this point, achieving the expected thermal performance. Thus, we prepared an eco-friendly wood-plastic composite with high latent heat capacity and high stability by using the dendritic pore structure of biomass activated carbon-based form-stable PCM, which has great significance in promoting energy conservation and emission reduction, responding to green technological innovation and promoting the development of the green and low-carbon industry.

Oscillating combustion of different fuel types for NOX reduction in grate furnaces and coal burners

Oscillating combustion is a method to reduce NOX emissions and is to be understood as a time-resolved staged combustion where either the fuel or the secondary air supply is oscillated. These two operating options with oscillating combustion have been the focus of the research group behind this paper for several years. In this work, experimental investigations of an oscillating air supply demonstrate nitrogen oxide reductions in the combustion of hard coal, lignite, wood pellets and waste wood chips by up to 35 %. Investigations were carried out in a test facility for pulverized fuel called BRENDA, in a laboratory fixed bed reactor called KLEEA and an industrial vibrating-grate firing system.

Magnetic properties of ilmenite used for oxygen carrier aided combustion

Oxygen carrier aided combustion is a combustion process that utilizes oxygen carrying particles in a fluidized bed to transport oxygen from oxygen-rich to oxygen-poor regions in the reactor. A commonly used oxygen-carrying material is ilmenite (FeTiO3) which is a naturally occurring mineral. At higher oxygen partial pressures ilmenite can react to pseudobrookite (Fe2TiO5) and thereby take up oxygen. Upon reduction of pseudobrookite in oxygen-lean locations the oxygen is released, which enhances the distribution of oxygen through the reactor.Ilmenite was used as bed material in an industrial 115 MWth circulating fluidized bed (CFB) boiler where recycled waste wood and wood chips were utilized as fuel. Bottom ash samples were extracted after one and two weeks and the samples were separated into two fractions by a magnetic separator. The magnetic fraction was expected to be enriched in iron-containing oxides and was therefore aimed to be recirculated into the boiler.The SEM-EDS analysis revealed that the non-magnetic fraction consists to the largest extent of feldspar (KAlSi3O8) particles. A significant amount of freshly introduced ilmenite particles was also classified as non-magnetic by the magnetic separator. Characteristic for these particles was a lack of ash layer, suggesting they had only recently been added to the system. In the magnetic fraction, several feldspar particles were found which were covered by a layer rich in Ca, Fe, Ti, and Si. Comparing the XRD analysis of the ash prior to magnetic separation with its magnetic fraction revealed a decrease of the peaks corresponding to feldspar. The removal of feldspar particles by magnetic separation was further corroborated by XRF analysis, where the concentration of K, Al and Si was significantly higher in the non-magnetic fraction, however, no changes were observed in the concentration of Fe. The present analyses shows that prolonged exposure time of ilmenite increases its magnetic susceptibility. Non-magnetic feldspar was shown to acquire significant magnetic susceptibility by formation of a surface layer containing Fe-rich attrition products from ilmenite.

Economic Improvement of Small and Medium Business through the Utilization of Waste

This research aims to downstream/commercialize integrating the management of export-scale wood products with the potential for waste wood chips and sawdust as an impact, so as to increase village potential and create an environmentally friendly village in Manggung village in order to increase village potential. This research was conducted as a leap in the field ofwood product management and processing of waste wood scraps and sawdust into handicrafts and accessories. Improved financial management and marketing of wood production in Manggung village through improving the quality of human resources as well as export-import training to help increase exports of wood products as well as handicrafts and accessories. By utilizing local potential and local wisdom and increasing the role of persons with disabilities and victims of layoffs through training to increase knowledge and skills by cooperating with the support of the Boyolali District Government. Institutional strengthening of BUMDes Maju Makmur in optimizing the management of wood and wood waste through mentoring, training and provision of supporting equipment as well as improving governance capabilities and establishing teaching factories that will be used to study undergraduate students.

Properties of Light Cementitious Composite Materials with Waste Wood Chips

The CO2 emissions from the cement industry and the production of waste wood chips are increasing with the rapid growth of the construction industry. In order to develop a green environmental protection building material with low thermal conductivity and up to standard mechanical properties, in this study, pine waste wood chips were mixed into cement-based materials as fine aggregate, and three different kinds of cementitious binders were used, including sulfur aluminate cement (SAC), ordinary Portland cement (OPC), and granulated blast furnace slag (GBFS), to prepare a recycled light cementitious composite material. The mechanical, thermal conductivity, shrinkage, water absorption, and pore structure of a wood chip light cementitious composite material were studied by changing the Ch/B (the mass ratio of wood chip to binder). The results showed that the strength, dry density, and thermal conductivity of the specimens decreased significantly with the increase in the Ch/B, while the shrinkage, water absorption, and pore size increased with the increase in the Ch/B. By comparing three different kinds of cementitious binders, the dry density of the material prepared with OPC was 942 kg/m3, the compressive strength of the material prepared with SAC was 13.5 MPa, and the thermal conductivity of the material prepared with slag was the lowest at 0.15 W/m/K. From the perspective of low-cost and low-carbon emissions, it was determined that the best way to prepare a light cementitious composite with waste wood chips is to use granulated blast furnace slag (GBFS) as the cementitious binder.

Applied smouldering for co-waste management: Benefits and trade-offs

Smouldering combustion is emerging as a valuable application for many environmentally beneficial purposes, including waste-to-energy. While many applied smouldering systems rely on small fractions of fuel mixed within inert porous media (IPM) like coarse grain silica sand, there is also an opportunity to pursue co-waste management with much higher fuel loadings. This study explores these co-waste systems by blending non-smoulderable wastes (e.g., sewage sludge) with smoulderable wastes (e.g., construction waste woodchips) to form porous solid fuels (PSFs). Key differences between these IPM and PSF systems were identified by contrasting the temperature profiles in space and time, specific mass loss rates, and emissions profiles across experiments in multiple reactors (with 0.054, 0.080, and 0.300 m radii). For example, the PSF systems exhibited higher throughputs, a more straightforward path towards continuous operation, improved scalability, and higher production of potentially useful by-products (e.g., CH4, H2) than the IPM systems. However, the PSF systems were more sensitive to extinction and exhibited lower fuel moisture content limitations than the IPM systems. Altogether, this study illuminates the benefits and trade-offs of co-waste smouldering.

Multi-objective utilization of wood waste recycled from construction and demolition (C&D): Products and characterization

Producing energy and higher value bio-products from waste materials has been proposed as an economically viable opportunity in the renewable energy sector. However, several challenges associated with the integrated biomass conversion processes remain to be resolved. The present study introduces a multi-faceted plant production of thermal energy and biochar from construction and demolition (C&D) wood chips. The overarching objective of the study is to reduce waste materials while simultaneously producing a self-independent clean thermal energy resource along with value-added co-products such as biochar, biogases and/or activated carbon. The combined thermal energy and slow pyrolysis unit relies on 95% of its energy from waste wood chips to produce thermal energy and high value carbon products. The system not only supplies the energy required for the indirect pyrolysis unit but also provides a major portion of thermal energy demanded for the site.A multi-purpose objective of wood waste management, energy production from waste material, high-quality biochar from waste wood (over 80% carbon), and carbon offsets is demonstrated through the utilization of this plant by addressing some of the major previously problems and challenges faced. The information is useful for techno-economic and life cycle analysis in the next study.

Processing of low-density waste in fluidized bed made out of lightweight expanded clay aggregate

The main aim of the study is to obtain a new, innovative method for the organization of combustion processes in fluidized bed reactors. A key aspect of the change in the organization of the fluidized bed combustion process is the creation of a fluidized bed made out of lightweight expanded clay aggregate (LECA). The new fluidized bed has a density of 0.5 g/cm3, therefore, allowing for thermal processing of low-density solid and liquid industrial wastes, as well as waste biomass. Polyolefins (polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, and polypropylene homopolymer) were selected as examples of low-density solid wastes. The use of an innovative fluidized bed for liquid waste degradation was studied on the example of glycerol combustion. Waste wood chips were chosen to represent low-density biomass. Thermal degradation of selected materials in the fluidized bed made out of LECA was carried out at a temperature range of 500–900 °C with an interval of 100 °C. Video analysis of the fluidized bed surface proved the sinking of waste materials into the bed and significant elimination of diffusion flames in the freeboard. Qualitative and quantitative flue gas analysis was carried out using the FTIR spectrometer. More than 95% conversion of the carbon contained in the polyolefins to CO2 was achieved already at 700 °C. At 500 °C, more than 30% of the polymeric carbon left the reactor as aromatic compounds. To avoid the emission of harmful aldehydes during the thermal processing of glycerol, the bed should be heated to at least 800 °C. Waste wood chips as an alternative fuel can be thermally incinerated in the fluidized bed made out of LECA. The disappearance of volatile organic compounds and CO emissions occurred at 700 °C and 800 °C.

Solar pyrolysis tars treatment using oxidation processes – Efficiency and toxicity analysis

This paper presents oxidation and photocatalytic oxidation as the methods for elimination of toxic activity of biomass pyrolysis liquids subjected to the environment – water. With the increasing interest in biomass pyrolysis-derived fuels and chemicals, there is still a need for determining the environmental impact of unwanted leakage of the pyrolysis liquids to the environment via inappropriate handling or containers damage and proposing adequate solutions to solve it. Tars from solar pyrolysis of three biomass types (waste straw – WS, wood chips – WC, and dried sewage sludge – DSS) were treated using selected oxidation processes (ozonation – O3, photolysis – UV, and photocatalysis – UV-TiO2). The decomposition of organic substances present in the tars was investigated by changing the absorbance (Abs), total organic carbon (TOC), and phenol index (PI). Tar solutions before and after treatment were also submitted to an ecotoxicological assessment. It was determined that the tars organic substances content depended on the type of biomass subjected to solar pyrolysis. The highest concentration of organics was denoted in the liquid products from the solar pyrolysis of the sewage sludge. The decomposition of organic substances took place in the process of photocatalysis and ozonation, with higher effectiveness of the latter. The organic compounds present in the solar pyrolysis tar depend on the biomass feedstock. After 60 min of photocatalysis (TiO2 dose 1500 mg/L), phenolic compounds from tars coming from the solar pyrolysis of waste straw and wood chips were completely removed. In turn, the reduction in Abs and TOC was 37 and 19% for WS and 41 and 28% for WC, respectively. Abs in tars from the solar pyrolysis of sewage sludge in the photocatalysis process did not change, and the reduction of TOC and PI was 8 and 86%, respectively. However, the toxicity of post-process solutions requires attention. Tar solutions from the solar pyrolysis of wood chips after the photocatalysis process were non-toxic against bacteria, but tar solutions coming from the solar pyrolysis of waste straw and sewage sludge were low-toxic and toxic. Additionally, tars from the solar pyrolysis of sewage sludge after the photocatalysis process were highly toxic to crustaceans.

Organic matter amendments improve soil fertility in almond orchards of contrasting soil texture

The effects of organic matter amendments (OMA) on soil fertility in permanent cropping systems like orchards is under-studied compared to annual cropping systems. We evaluated experimentally the impact of OMAs on soil fertility in almond (Prunus dulcis) orchards over a two-year period with annual applications. Two OMAs, derived from composted green waste (GWC) or composted manure wood chips (MWC), were applied as surface mulch and compared to a control at two sites with different soil textures (sandy loam and loamy sand). OMAs increased soil moisture content (0–0.1 m depth) at both sites by 27–37%. Both amendments increased soil inorganic N at the sandy loam (GWC: 194%; MWC: 114%) and loamy sand (GWC: 277%; MWC: 114%) sites the month following application, but soil inorganic N concentrations quickly decreased to values similar to those of control plots. After two-years, the GWC and the MWC amendments increased the soil cation exchange capacity (CEC) by 112% and 29%, respectively, in the sandy loam site, but no change was observed in the loamy sand site. The greatest increase in soil extractable K occurred in the GWC-amended plots at the sandy loam site even though the initial K concentration of MWC was higher. Both OMAs increased soil organic carbon (SOC) after two years, but the SOC increase in the GWC-amended plots was greater. Our results suggest that OMAs can significantly improve soil fertility after one or two annual applications, and that fertility gains appear to be dependent on soil texture than the nutrient concentrations of the OMA.

Biochars from Post-Production Biomass and Waste from Wood Management: Analysis of Carbonization Products.

Waste biomass can be used as an alternative source of energy. However, such use requires prior treatment of the material. This paper describes the physicochemical characteristics of biochar obtained by the thermochemical decomposition of six types of agricultural waste biomass: residues from the production of flavored spirits (a pulp of lime, grapefruit and lemon), beetroot pulp, apple pomace, brewer’s spent grain, bark and municipal solid waste (bark, sawdust, off-cuts and wood chips). The biomass conversion process was studied under conditions of limited oxygen access in a reactor. The temperature was raised from 450 to 850 °C over 30 min, followed by a residence time of 60 min. The solid products were characterized in terms of their elemental compositions, mass, energy yield and ash content. The gaseous products from pyrolysis of the biomass were also analyzed and their compositions were characterized by GCMS (Gas Chromatography–Mass Spectrometry). The carbonization process increased the carbon content by, on average, 1.7 times, from an average percentage of 46.09% ± 3.65% for biomass to an average percentage of 74.72% ± 5.36% for biochars. After carbonization, the biochars were found to have a net calorific value of between 27 and 32 MJ/kg, which is comparable or even higher than good-quality coal (eco pea coal 24–26 MJ/kg). The net calorific values show that the volatile products can also be considered as a valuable source of energy.

Pyrolysis and torrefaction of waste wood chips and cone-like flowers derived from black alder (Alnus glutinosa L. Gaertn.) for sustainable solid fuel production

The aim of this study was to investigate black alder (Alnus glutinosa L. Gaertn.) waste wood chip biochar in torrefaction and pyrolysis over a wide range of temperatures (250, 300, 400, 500, 600 and 800 °C) and residence times of 1 h. The resultant biochar was investigated in detail. The carbon-rich materials obtained were compared with biochar derived from black alder cone-like flowers, which are woody by product in black alder cultivation. The obtained results displayed rather high heating values for both examined materials. The higher heating values were as high as 27.9 and 29.7 MJ kg−1 for biochar obtained at 600 and 800 °C from cone-like flowers and wood chips, respectively. Black-alder-originated biochar displayed a relatively high energy densification ratio; thus, such bioresources might be promising in terms of the production of sustainable solid smokeless fuels.

Development of a numerical model for co-combustion of the blended solid waste fuel in the grate boiler

This paper presents a model developed to numerically simulate the combustion of blended solid fuel in the grate boiler. The model can efficiently reproduce the thermal conversion process through a separate definition of the participating fuel by their unique physical and chemical properties. The advantage of this consideration is its flexibility and comprehensiveness in understanding and predicting the system reaction. The model is firstly validated with lab-scale experimental results. The validation shows that after the mechanism kinetics is determined through mono-combustion, the model is able to resemble the co-combustion result through direct numerical blending. This model is then extended for application in the industrial-scale boiler to investigate the blended combustion of waste wood chips with different ash content. The mono-combustion of the fuel is verified against boiler measurements, and then the effect of blending ratio and air supply is analyzed numerically. The results show that co-combustion can enhance on-grate carbon conversion as well as overall efficiency, as the low ash fuel content increase. Moreover, increasing the primary air supply while keeping the same total air excess can also elevate the thermal efficiency effectively.

Study of the mechanical behavior of a lightweight wood concrete

Today, the development of building materials based on toxic or non-toxic industrial waste is a topical issue for the productive structures in industrialized countries. In this article, non-toxic wood waste (wood chips) is used to improve the characteristics of ordinary concrete (lightness, thermal insulation, acoustic absorption, rigidity under stresses, etc.) for the purpose of eventually developing light wood concrete. The present experimental study aims at conducting a comparative behavioral analysis between concretes based on non-toxic wood waste of natural origin on the one hand, and ordinary concrete on the other.In order to achieve this goal, a series of test pieces were made, with five different formulations. Four of them are lightweight wood-concretes obtained by the substitution of a volume of aggregates; the fifth formulation is ordinary concrete. A number of tests were carried out at the Construction Technical Control Laboratory at different ages, i.e. 7, 14, 21 and 28 days. Interesting results were obtained with respect to the evolution of the mechanical characteristics of light wood-concrete at early age. Some of these features, such as the long-term compressive strength of concrete, are essential parameters in civil engineering.