Timo Kärki
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View article: Structural and Chemical Modification of Cellular Wood Composite for Enhanced Strength, Fire, and Biological Resistance
Structural and Chemical Modification of Cellular Wood Composite for Enhanced Strength, Fire, and Biological Resistance Open
High-performance cellular wood composites with enhanced strength, flame retardancy, and termite resistance were developed through delignification, densification, and impregnation with amino-functionalized polyglycerol phosphate (APGP) and …
View article: Reutilization Potential of Fine Fraction from Construction and Demolition Waste in the Circular Economy
Reutilization Potential of Fine Fraction from Construction and Demolition Waste in the Circular Economy Open
Fine fraction waste is a remarkable secondary material without a rational utilization objective, demonstrating a real research gap for its study. The fine fraction can constitute up to several dozen percent of the total waste volume, repre…
View article: Assessing the Effects of Inline Steam Treatment on the Geometric Characteristics of the Thermoformed Plastic‐Coated Fibre‐Based Products
Assessing the Effects of Inline Steam Treatment on the Geometric Characteristics of the Thermoformed Plastic‐Coated Fibre‐Based Products Open
Thermoforming of fibre‐based materials faces challenges due to their restrictive three‐dimensional formability and lack of compatibility between material properties and traditional thermoforming methods. Treatment techniques present an int…
View article: Assessing life cycle sustainability: A comprehensive review of concrete produced from construction waste fine fractions
Assessing life cycle sustainability: A comprehensive review of concrete produced from construction waste fine fractions Open
This paper presents an overview of the scholarly works employing the life cycle assessment (LCA) approach to evaluate the environmental impact of construction and demolition waste (CDW) fine fractions derived from concrete elements through…
View article: A review of plastic waste nanocomposites: assessment of features and applications
A review of plastic waste nanocomposites: assessment of features and applications Open
View article: A review of flame protection of wooden material and future potential with nano additives
A review of flame protection of wooden material and future potential with nano additives Open
Wood is a highly sustainable material and there is significant interest in its use in the construction industry in terms of modern building construction. However, safety rules and regulations, including fireproof requirements, have become …
View article: Katsaus näkemyksistä ja osaamistarpeista puutekniikan korkeakoulutuksessa
Katsaus näkemyksistä ja osaamistarpeista puutekniikan korkeakoulutuksessa Open
Metsä ja puuteollisuudella on kansantaloudellisesti merkittävä asema hyvinvointiyhteiskunnan varmistajana sekä taloudellisesti että sosioekonomisesti, etenkin valtakunnallisesta näkökulmasta tarkasteltuna. Eräs merkittävä tekijä toimialan …
View article: Thermoformability study of wood flour–HDPE composites with variations in wood content under vacuum forming
Thermoformability study of wood flour–HDPE composites with variations in wood content under vacuum forming Open
View article: The Effects of Bromine Additives on the Recyclability of Injection Molded Electronic Waste Polymers
The Effects of Bromine Additives on the Recyclability of Injection Molded Electronic Waste Polymers Open
Excessive waste amounts, such as waste electrical and electronic equipment (WEEE) and plastic waste, have increased simultaneously with the development of society. Despite the increased material amounts, the recycling rates are too low and…
View article: Highly Flexible, Self-Bonding, Self-Healing, and Conductive Soft Pressure Sensors Based on Dicarboxylic Cellulose Nanofiber Hydrogels
Highly Flexible, Self-Bonding, Self-Healing, and Conductive Soft Pressure Sensors Based on Dicarboxylic Cellulose Nanofiber Hydrogels Open
Conductive hydrogels have gained a great deal of interest in the flexible electronics industry because of their remarkable inherent properties. However, a significant challenge remains for balancing hydrogel's conductivity, self-healing, a…
View article: Effects of thermoforming operation and tooling on the thermoformability of plastic‐coated fibre‐based materials
Effects of thermoforming operation and tooling on the thermoformability of plastic‐coated fibre‐based materials Open
Advances in the three‐dimensional (3D) forming of fibre‐based materials require the formulation of more formable materials and the development of process lines, machinery, and tools. Using a thermoforming process to convert fibre‐based mat…
View article: The effect of glass fiber on fresh properties of industrial based geopolymer concrete
The effect of glass fiber on fresh properties of industrial based geopolymer concrete Open
This research study is primarily focused on evaluating the fresh properties of industrial-based 3D printable geopolymer concrete by adding glass wool strings and glass fibers activated by sodium silicate solution with a molar ratio of 2.4-…
View article: Closed-Loop Recycling and Remanufacturing of Polymeric Aircraft Parts
Closed-Loop Recycling and Remanufacturing of Polymeric Aircraft Parts Open
The aviation industry is facing the challenge of reducing fossil fuels and emissions. Fuel efficiency is improved by making efficient powerplant systems and lighter aircraft. Modern passenger aircraft utilize polymeric and polymeric compos…
View article: The Effects of Additives on the Recyclability of Injection Molded WEEE Polymers
The Effects of Additives on the Recyclability of Injection Molded WEEE Polymers Open
View article: A comparative cradle-to-gate life cycle assessment of geopolymer concrete produced from industrial side streams in comparison with traditional concrete
A comparative cradle-to-gate life cycle assessment of geopolymer concrete produced from industrial side streams in comparison with traditional concrete Open
Traditional concrete production is a major contributor to global warming. Industrially produced geopolymer concrete is a viable substitute to limit the negative impacts of concrete production. Thus, this study developed novel geopolymer co…
View article: Industrial Waste Pretreatment Approach for 3D Printing of Sustainable Building Materials
Industrial Waste Pretreatment Approach for 3D Printing of Sustainable Building Materials Open
The large volume of industrial by-products and wastes from the construction, timber and paper industries has become a serious challenge worldwide. Recycling these industrial wastes as functional materials in the construction industry is an…
View article: Esterified Lignin from Construction and Demolition Waste (CDW) as a Versatile Additive for Polylactic‐Acid (PLA) Composites—The Effect of Artificial Weathering on its Performance
Esterified Lignin from Construction and Demolition Waste (CDW) as a Versatile Additive for Polylactic‐Acid (PLA) Composites—The Effect of Artificial Weathering on its Performance Open
Demand for sustainable packaging and building materials has increased the need for biobased additives. Biocomposites can often be exposed to different weather conditions and UV irradiation. Thus, additives to prevent the negative impact of…
View article: Assessment of critical factors in waste electrical and electronic equipment (WEEE) plastics on the recyclability: A case study in Finland
Assessment of critical factors in waste electrical and electronic equipment (WEEE) plastics on the recyclability: A case study in Finland Open
Excessive waste is continually accumulating owing to increased consumption, and an excellent example is the consumption of electrical and electronic equipment (EEE), which are eventually transformed into waste from electrical and electroni…
View article: Three‐dimensional forming of plastic‐coated fibre‐based materials using a thermoforming process
Three‐dimensional forming of plastic‐coated fibre‐based materials using a thermoforming process Open
Three‐dimensional (3D) forming of fibre‐based materials has been a topic of growing interest over recent years and 3D forming processes using hydroforming, press forming and deep drawing processes have been widely explored. Thermoforming a…
View article: Life Cycle Assessment of a Thermal Recycling Process as an Alternative to Existing CFRP and GFRP Composite Wastes Management Options
Life Cycle Assessment of a Thermal Recycling Process as an Alternative to Existing CFRP and GFRP Composite Wastes Management Options Open
There are forecasts for the exponential increase in the generation of carbon fibre-reinforced polymer (CFRP) and glass fibre-reinforced polymer (GFRP) composite wastes containing valuable carbon and glass fibres. The recent adoption of the…
View article: Effect of Fiber Content and Silane Treatment on the Mechanical Properties of Recycled Acrylonitrile-Butadiene-Styrene Fiber Composites
Effect of Fiber Content and Silane Treatment on the Mechanical Properties of Recycled Acrylonitrile-Butadiene-Styrene Fiber Composites Open
The aim of the present study was to investigate the effects of fiber content and then silane treatment on the mechanical performance of the natural fiber composites of recycled acrylonitrile–butadiene–styrene (ABS) provided by the automoti…
View article: Optimization of Compression Molding Process Parameters for NFPC Manufacturing Using Taguchi Design of Experiment and Moldflow Analysis
Optimization of Compression Molding Process Parameters for NFPC Manufacturing Using Taguchi Design of Experiment and Moldflow Analysis Open
This paper presents the application of Taguchi design of experiment and Autodesk Moldflow® simulation in finding the optimal processing parameters for the manufacturing of natural fiber–polymer composite products. The material used in the …
View article: A Finite Element Study to Investigate the Mechanical Behaviour of Unidirectional Recycled Carbon Fibre/Glass Fibre–Reinforced Epoxy Composites
A Finite Element Study to Investigate the Mechanical Behaviour of Unidirectional Recycled Carbon Fibre/Glass Fibre–Reinforced Epoxy Composites Open
Recycled carbon fibre–reinforced epoxy (rCF/EP) composites and recycled glass fibre–reinforced epoxy (rGF/EP) composites were numerically investigated to examine their mechanical properties, such as uniaxial tensile and impact resistance, …
View article: Cost Analysis of Various Factors for Geopolymer 3D Printing of Construction Products in Factories and on Construction Sites
Cost Analysis of Various Factors for Geopolymer 3D Printing of Construction Products in Factories and on Construction Sites Open
The utilization of geopolymer 3D printing for construction products in recent years has been exceptionally substantial, owing to their low carbon dioxide emissions, high-performance properties such as durability, and good thermal and mecha…
View article: Printing Parameter Requirements for 3D Printable Geopolymer Materials Prepared from Industrial Side Streams
Printing Parameter Requirements for 3D Printable Geopolymer Materials Prepared from Industrial Side Streams Open
The objective of this investigation is to study the printing parameter requirements for sustainable 3D printable geopolymer materials. Side streams of the paper, mining, and construction industries were applied as geopolymer raw materials.…
View article: The Impact of Textile Waste on the Features of High-Density Polyethylene (HDPE) Composites
The Impact of Textile Waste on the Features of High-Density Polyethylene (HDPE) Composites Open
An increased amount of textile waste will be available in the future, and its utilization requires attention from various perspectives. The re-utilization of textile waste in a second material cycle is an option for dealing with a global p…
View article: A Study on the Effect of Construction and Demolition Waste (CDW) Plastic Fractions on the Moisture and Resistance to Indentation of Wood-Polymer Composites (WPC)
A Study on the Effect of Construction and Demolition Waste (CDW) Plastic Fractions on the Moisture and Resistance to Indentation of Wood-Polymer Composites (WPC) Open
This paper investigated the moisture and strength properties of wood-polymer composites (WPC), which were made using three different recycled polymers using wood flour as filler. The recycled polymers were acrylonitrile butadiene styrene (…
View article: Design of Tooling System and Identifying Crucial Processing Parameters for NFPC Manufacturing in Automotive Applications
Design of Tooling System and Identifying Crucial Processing Parameters for NFPC Manufacturing in Automotive Applications Open
The aim of this study was to design a tooling system for manufacturing automotive components using a natural fiber polymer composite (NFPC) material. As a case study, an automotive battery cover was selected and a compression molding tool …
View article: An evaluation of thermoplastic composite fillers derived from construction and demolition waste based on their economic and environmental characteristics
An evaluation of thermoplastic composite fillers derived from construction and demolition waste based on their economic and environmental characteristics Open
The use of waste is often justified by the economic and environmental benefits of their use. This study compares the use of waste materials derived from construction and demolition waste—namely wood waste, mineral wool waste, gypsum board …
View article: Re-Processing of Multilayer Plastic Materials as a Part of the Recycling Process: The Features of Processed Multilayer Materials
Re-Processing of Multilayer Plastic Materials as a Part of the Recycling Process: The Features of Processed Multilayer Materials Open
The weight of packaging materials will be increased with advanced innovations, such as multilayer plastic. The consequence of the advanced innovations is challenges in the following reuse activities. This study aimed to investigate the pro…