Maris Sinka

Maris Sinka
Riga Technical University | RTU · Department of Civil Engineering

Doctor of Engineering
Researching bio-based building materials and 3D printing of building materials @ RTU, Head of 3D concrete printing lab

About

47
Publications
21,373
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
342
Citations
Citations since 2017
39 Research Items
331 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Introduction
Maris Sinka currently works at the Department of Civil Engineering, Riga Technical University. Maris does research in Materials Engineering, Structural Engineering and Civil Engineering.

Publications

Publications (47)
Article
Full-text available
To address the need to reduce consumption and pollution in the industrial sector, composite materials were created using a new type of raw materials—organic lake sediments (sapropel) as a binder; sphagnum moss, flax fiber, and vermiculite as a filler. The main application of these composite materials is for sound absorption and moisture buffering,...
Article
Full-text available
3DCP is becoming more common in the construction industry nowadays, however, the aspects of durability of printed concrete are not well-studied yet. This paper focuses on determining how frost-thaw cycles affect printed concrete samples, compared to cast samples of the same concrete mix and whether the conventional concrete frost resistance tests c...
Article
Full-text available
Eco materials derived from natural plant fibres and mineral binders are an alternative solution for modern ecological construction. This research is devoted to developing production technology for ecological high-performance fibre composite materials based on hemp shives and magnesium binder. The proposed composite wall structures consist of outer...
Conference Paper
Full-text available
More than 4.4 billion metric tons of cement were produced in 2021 [1], making it one of the most common building materials. Unfortunately, excessive cement use brings up several environmental concerns, one being the enormous volumes of CO 2e (carbon dioxide equivalent) created as a by-product. CO 2e is a standard unit for measuring carbon footprint...
Article
Full-text available
Magnesium binder is an alternative to lime binder in the technology of hemp-based composites. The advantage of using this binder is an increase in mechanical strength compared to those based on lime. These composites are mainly used as an insulating wall material, as a filling of a wooden frame structure. During compaction of the mixture, hemp shiv...
Article
Full-text available
Cement is a widely used building material, with more than 4.4 billion metric tons produced in 2021. Unfortunately, the excessive use of cement raises several environmental issues, one of which is the massive amounts of CO2e produced as a by-product. Using recycled materials in the concrete mix is widely employed to solve this problem. A method for...
Article
Full-text available
The share of bio-based materials in modern construction needs to grow more rapidly due to increasingly stringent environmental requirements as a direct result of the climate emergency. This research aims to expand the use of hemp concrete in construction by replacing traditional lime binder with magnesium oxychloride cement, which provides a faster...
Article
Full-text available
Three-dimensional concrete printing (3DCP) is becoming more common in the construction industry nowadays; however, the aspect of durability of printed concrete is not well-studied yet. Frost resistance is a very important factor for durability of concrete structures located in northern regions. Since air-entraining agents (AEAs) are widely used in...
Article
Full-text available
Hempcrete is a bio-based self-bearing envelope and thermal insulation building material that is becoming more popular nowadays and has a low environmental impact, especially CO 2 emissions. This study looks for solutions for hempcrete printing using a custom-built gantry type 3D printer typically used for concrete 3D printing. Preliminary research...
Article
Full-text available
The view towards a sustainable bioeconomy is increasing the interest of using renewable natural resources in the production of composites. Until now, the production of sustainable composites has been mainly examined from the point of view of material composition and structure, by replacing petroleum-based components with those that are obtained fro...
Article
Full-text available
The evolution of bio-based composites in the building industry is strongly linked with the growing demand for sustainable development, which is relevant nowadays. Hemp shives are a large group of organic residues that are obtained in the process of oil extraction as well as straw processing. These residues could be utilized along with a binder as c...
Article
Full-text available
Thermal insulation bio-composites made of plant origin by-products as bio-aggregates are one of the ways to decrease the impact of the building and construction sector on CO2 emissions. In this study, three bio-aggregates were analysed for their potential use in the production of bio-composites with potato starch binder. Technologically important p...
Poster
Full-text available
Hempcrete is 3D printable, has sufficient buildability and strength to form an outer shell layer for self-supporting walls the inner layer of such walls can be filled with less dense hempcrete, providing adequate thermal resistance at an overall wall thickness of 400-640 mm.
Article
Full-text available
Hempcrete is a very promising bio-based insulating material with a minor or even negative CO2 footprint and low thermal conductivity. To utilize it efficiently, it must be possible to make predictions regarding hempcrete hygrothermal performance and whether it is up to the modern standards—this requires a verified material model for use in numerica...
Conference Paper
Hemp concrete is a well-known bio-based building material, but due to its relatively low compressive strength is mainly used as an insulation material with a load-bearing wooden frame. There are possibilities to expand hemp concrete application in construction by substituting traditional lime with magnesium cement. Magnesium oxychloride cement is a...
Article
The present research investigated bio-based construction material based on hemp shives and gypsum. Low-density material was developed with densities of 200, 300, and 400 kg/m³. Simple yet robust production technology was used. For the first time, a binder for biocomposites obtained from phosphogypsum was used and properties were compared to commerc...
Article
Full-text available
This work is devoted to developing an energy-efficient solution for the external wall and evaluating its environmental impact. Several types of innovative single-layer and sandwich-type wall solutions were analysed and compared. Different constructive and thermal insulation materials were used, including traditional wall materials such as AAC (auto...
Conference Paper
The paper presents a method of calculation of thermal conductivity of bio-based building composites by applying numerical approach which based on the real morphology of sample and the solution of heat conduction equation in the micro-scale. The real microstructure of composite sample was obtained from the X-ray micro tomography (microCT). Then the...
Presentation
Full-text available
Short presentation with videos from our newly founded 3D printing laboratory and printing the first samples of hempcrete with lime binder
Article
Full-text available
The aim of this paper was to study the microbiological stability of bio-based composite building materials, which are made using organic-rich lake sediments (further – sapropel) with lime and magnesium cement as binders and hemp shives as filler. The microbial stability properties of the obtained composite materials were investigated and compared t...
Article
Biocomposite building materials with mineral binders are becoming more topical recently because they can address growing environmental concerns regarding carbon footprints and resource depletion better than traditional building materials. However, these new materials also pose new challenges. There have been issues with the compatibility of plant-o...
Article
Full-text available
The construction industry is one of the largest emitters of CO 2 because the production of traditional building materials is highly energy-intensive and uses considerable amounts of raw materials. This research aims to decrease the negative environmental impact of the construction industry by providing biocomposites with a low environmental impact...
Article
Full-text available
To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited...
Poster
Full-text available
Construction is one of the industries with the highest level of CO2 emissions, and it also has a negative effect on other environmental impact categories. This research aims to decrease the negative environmental impact of the construction industry by proposing alternative building materials that have lower environmental impacts due to their bio-ba...
Article
Full-text available
Traditional composite materials used for construction purposes currently face many questions regarding their sustainability – mainly because they do not come from renewable sources and due to the problems related to their end-of-life management. These challenges motivate companies and researchers to look at the natural fiber composite materials wit...
Article
Full-text available
Building materials contribute a significant amount of CO 2 to overall greenhouse gas emissions and this environmental impact should be reduced to improve the sustainability of the construction industry. Although new and low-carbon materials are emerging, the majority of materials used are still traditionally produced and are highly carbon intensive...
Article
Full-text available
Global warming being increasingly discussed, solutions for reducing emission greenhouse gases become more important in all industry sectors. The total energy consumed in the construction sector contribute up to 1/3 from all greenhouse gases emissions. Large part of it comes from the cement production – 5 % of the total global emissions. The foam co...
Article
Full-text available
Pēdējos gados pasaules politiskie līderi ir parakstījuši vairākas vienošanās, apņemoties ierobežot CO2 izmešu daudzumu, piemēram, Parīzes Klimata līgumu, ko Eiropas Savienība ratificēja 2016. gadā. Lai īstenotu šo apņemšanos, ES ir izvirzījusi nozīmīgus klimata mērķus, piemēram, Enerģētikas un klimata satvars 2030. gadam, kura mērķis ir līdz 2030....
Poster
Full-text available
In this study, traditionally used lime binders for hemp concrete were replaced by magnesium oxychloride binders and used in combination with hemp shives as a filler to produce composite materials to be used in production of construction panels on industrial scale. These panels consist of an outer and inner border layer and a middle thermal insulati...
Conference Paper
Full-text available
Bio-based building materials (3BMs) are one of the solutions for how the construction industry can mitigate its negative environmental impact because of energy consumed in material production and due to the insufficient thermal insulation of buildings, as, in general, these materials sequester CO2 in them and have low thermal conductivity. One of t...
Article
The construction industry (and buildings) is one of the largest energy consuming and CO 2 emitting sectors in the world. To counter this, more lightweight structures are being used and energy saving applications are being developed. Phase change materials (PCM) are materials that can be considered to tackle these new challenges. It has been proven...
Conference Paper
Full-text available
The hemp-lime concrete as a self-bearing thermal insulation material has a low thermal conductivity and neutral CO2 emissions. However, the strength limitation of lime binder is an issue to use this material as a load-bearing material. Magnesium oxychloride binders are of considerably higher strength level and better bio-compatibility compared to t...
Article
Full-text available
Reduction of the CO2 emissions in the atmosphere is one of the goals set forth by the European Union, hence various directives have been adopted, such as the European directive 2012/27/EU on energy efficiency, i.e. ensuring from 2019 the construction of the near-zero energy buildings (nZEB). The construction segment plays a very important part in s...
Article
Full-text available
Over the last years there has been an increase in demand for construction materials that fulfil the high-level energy efficiency requirements while ensuring reduced impact on environment compared to the traditionally used materials. The hemp-lime concrete as a self-bearing thermal insulation material with low thermal conductivity and neutral CO2 em...
Article
To counter the negative environmental impact, particularly greenhouse gas emission generated by the construction industry, many low-impact materials are being produced and researched having neutral CO2 emissions and low thermal conductivity. One of these materials is lime-hemp concrete, a self-bearing bio-based insulation material with low thermal...
Article
Full-text available
This paper presents a study focusing on the environmental impacts of foamed concrete production and exploitation. CO2 emissions are very important factor for describing durability and sustainability of any building material and its life cycle. The building sector is one of the largest energy-consuming sectors in the world. In this study CO2 emissio...
Conference Paper
Full-text available
The major CO2 emitting countries have concluded an agreement aimed at reducing the CO2 emissions at the Paris Climate Conference 2015. However, the emission levels are still on the rise. As the building material industry is one of the largest producers of CO2, it should find solutions to limit these emissions, such as development of new materials w...
Conference Paper
Full-text available
The aim of this paper is to study possibilities to obtain composite materials using organic rich lake sediments (further-sapropel) and lime as binders and hemp shives, wood fibre, and wood sanding dust as fillers. The mechanical and thermal properties of the obtained composite materials are investigated and compared to similar composites, such as l...
Article
Full-text available
The article discusses possibilities for creating sustainable concrete compositions from local dolomite raw materials. In the first part of the article, practical examples of the use of dolomite quarry by-products (siftings) as a component of concrete mixes are summarized. The second part of article presents experimental study on obtaining caustic d...
Article
Full-text available
Recent development trends largely look for possibilities of a wider use of natural materials and local resources. In this perspective, the use of organic rich lake sediment - sapropel - as a binding material in line with other environmentally friendly filling materials can be considered as a challenge. Sapropel itself is a valuable resource with mu...
Article
Full-text available
One of the main challenges that construction industry faces today is how to address the demands for more sustainable, environmentally friendly and carbon neutral construction materials and building upkeep processes. One of the answers to these demands is lime-hemp concrete (LHC) building materials - carbon negative materials that have sufficient th...
Article
Full-text available
The key focus of the presented research is on sustainable thermal insulation biocomposites which can be made from locally available hemp and lime. The main gains of the use of such material are given, with emphasis on CO2 reduction. In the first stage samples of an artificial hydraulic lime using three different limes and three hydraulic additives...
Article
Full-text available
The EU directive 2010/31/EU – sets goals to reduce CO2 emission levels by 20% until year 2020. As primary energy for households and construction industry both are among the largest manufacturers of CO2, a building material that can positively impact both these industries is topical. A lime-hemp concrete (LHC) is a material with negative CO2 balance...
Article
Full-text available
Fossil energy resources in Latvia are imported from other countries, but at the same time, our country is rich in renewable energy resources and other raw materials, which are used very little. In the study it is proposed to create a thermal insulation material from hemp shives grown in Latvia as a filler material and lake sediment - sapropel as a...
Article
Full-text available
To answer different problems set by the 21st century, European Union is constantly updating the old and adapting new directives and regulations. One of these directives is 2010/31/EU as a piece of Energy package which sets forth a goal to reduce primary energy use by 20% and to achieve 20% reduction in greenhouse gas emissions by 2020. It also sets...
Conference Paper
Full-text available
The rising global temperature is partly associated with the increase of anthropogenic carbon dioxide (CO2) emissions. Major part of this CO2 comes from building material industry and from energy consumed to maintain buildings. To solve this problem a building material that both has low thermal conductivity and emits low amount of CO2 is needed. Hem...

Network

Cited By

Projects

Projects (4)
Project
The project is aimed to decrease the negative environmental impact of the construction industry by providing alternative building materials with low environmental impact due to their bio-based components and efficient use of the materials through 3D printing.
Project
To promote the sustainability of the building industry in Latvia, and globally, by developing a new concept for low-energy buildings using ecological and renewable materials and energy systems.