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Investigation of Basalt Reinforced Digital Printed (BRDP) structures

School of Natural and Built Environment | PHD
Funding
Funded
Reference Number
SNBE-2024-GA2
Application Deadline
30 June 2024
Start Date
1 October 2024

Overview

This project aims to explore innovative reinforcement methods for digitally manufactured concrete structures using basalt composites. 3D concrete printing, a groundbreaking technology within digital concrete manufacturing, is driving a paradigm shift in the traditionally low-tech construction sector. The emergence of digital concrete manufacturing offers unparalleled flexibility, speed, and cost-effectiveness compared to traditional methods. As the construction industry accounts for 13% of global expenditure but has an annual growth rate of only 1%, digitalization will boost productivity and open new possibilities for architects, engineers, and construction professionals. Enhancing the structural integrity and durability of 3D printed concrete structures is one of the critical aspects for advancing the technology readiness level of 3D concrete printed (3DCP) structures. From a structural point of view, effective reinforcement strategies and a strong interlayer bond are pivotal research areas for optimizing the performance and durability of 3D printed concrete structures. While traditional reinforcement methods, such as steel bars (rebars) and mesh, have been extensively used in conventional concrete construction, the unique characteristics of 3DCP demand innovative approaches to reinforcement.

In recent years, researchers have made significant innovation in developing novel reinforcement techniques tailored specifically for digital concrete manufacturing. Among the most novel fabrication solutions stand out the Mesh Mould by ETH Zurich (Hack et al., 2020) where automated fabrication of reinforcement is performed using precision guided robots. Salet et al, (2018), demonstrated using metal wire as reinforcement placed while with the concrete is extruded through an ad hoc new nozzle design. Researchers at Swinburne University of Technology, also introduced a new process approach for embedding steel mesh reinforcement at the same time as concrete layers are being printed (Marchment and Sanjayan, 2020).
Recently Perrot et al. (2020) proposed the nailing of layers as a promising reinforcement method for 3D printed concrete structures. By embedding nails or dowels between successive layers, this approach enhances interlayer bonding and improves the overall mechanical properties of the printed elements. While these findings highlight the potential of simple yet effective reinforcement techniques, one major weakness of this method lies on the vulnerability of steel nails to corrosion which is also facilitated by penetration of corrosive agent and carbonation process due to permeability. Influence of corrosion was considered by researchers at Loughborough University (Wang et al. 2020) who have used Alkali resistant-glass textiles as reinforcement in 3D printed concrete to enhance the flexural strength of 3D printed beams.
In response to these challenges this PhD project aims to explore the innovative use of basalt composites as reinforcement components for 3DCP structures. While basalt fibers are currently investigated to reduce shrinkage and enhance durability in 3DCP composition, the direct use of basalt as reinforcement remains unexplored. Basalt, a naturally occurring volcanic rock, has high tensile strength and excellent corrosion resistance, making it an ideal material for reinforcing concrete. Basalt fibers are also more sustainable than glass fibers due to their simpler production process, lower energy consumption, minimal emissions, and higher recyclability. Additionally, basalt is easily produced in a variety of lightweight geometries and shapes, from bars and minirebars, to textiles and grids allowing continuous, tailored reinforcement that cater for flexibility in the architectural and structural design.

The proposed research will focus on two primary areas:

Topology Optimization: This aspect of the research will involve the use of advanced numerical analysis and scaled prototypes to determine the optimal placement and geometry of reinforcement within 3D printed concrete elements (Vantyghem et al., 2020). By employing computational methods and mechanical testing, the study aims to identify configurations that enhance the structural efficiency of the printed structures. Specifically, basalt minibars and grids will be investigated as potential reinforcement solutions. The goal is to propose reinforcement strategies that meet structural requirements and have potential to be easily implemented on real scale structures.

Optimization of basalt-mortar bond and interlayer bond: The second focus area of the research will be on refining the composition of the mortar used in 3D concrete printing. This aims to ensure a strong bond between basalt reinforcement and mortar, as well as enhancing interlayer adhesion within the printed elements. This will be critical for ensuring that the reinforcement integrates effectively with the printed concrete and maintaining the structural integrity of the 3DCP structures over time. The optimized mortar mix will need to balance extrudability and pumpability with buildability, ie, stability during printing, dimensional accuracy and overall strength and durability of the final printed structure.

References

• Hack et al. (2020). Structural stay-in-place formwork for robotic in situ fabrication of non-standard concrete structures: A real scale architectural demonstrator. Automation in Construction, 115, 103197.
• Salet et al. (2018). Design of a 3D printed concrete bridge by testing. Virtual and Physical Prototyping, 13(3), 222-236.
• Marchment and Sanjayan (2020). Mesh reinforcing method for 3D concrete printing. Automation in Construction, 109, 102992.
• Perrot et al. (2020). Nailing of layers: A promising way to reinforce concrete 3D printing structures. Materials (Basel), 13, 1-13.
• Wang et al. (2020). Flexural behaviour of AR-glass textile reinforced 3D printed concrete beams. In Second RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2020 (pp. 728-737). Springer International Publishing.
• Vantyghem et al. (2020). 3D printing of a post-tensioned concrete girder designed by topology optimization. Automation in Construction, 112, 103084.

ESSENTIAL BACKGROUND OF CANDIDATES

Minimum of a strong upper second class (2.1) honours degree (completed or in the final stages of completion) in
civil engineering/structural engineering/concrete technology;
experience of finite element analysis

RESEARCH PROPOSAL - INSTRUCTIONS FOR APPLICANTS

Please note that applicants are not required to upload a research proposal as part of the application. Instead, interested candidates should upload a copy of their CV and a covering letter outlining their motivation to undertake a PhD on this theme, and describing any relevant experience in:
Civil engineering: mechanics of structures and/or concrete technology

APPLICATION PROCEDURE

• To apply, visit https://dap.qub.ac.uk/portal/user/u_login.php (link to the QUB Direct Application Portal)
• Apply for Degree of Doctor of Philosophy in ‘Civil Engineering’ at Queen's University Belfast, School of Natural and Built Environment.
• State name of lead supervisor on application form ‘Dr Giuseppina Amato’.
• State the intended source of funding on your application as EPSRC.
• Include your CV and a covering letter.

Funding Information

PLEASE NOTE: These EPSRC studentships are open only to candidates who are classed Home, UK or Republic of Ireland and candidates with settled status or ILTR. International candidates are not eligible. The value of an award includes the cost of approved fees as well as maintenance support (stipend). As an indicator, the level for 2023/2024 is currently £18,622.

Please note that this research project is one of several advertised projects at Queen’s which are in competition for funding. The selection will be based on the projects which receive the best application.

Project Summary
Supervisor

Dr Giuseppina Amato

More Information

g.amato@qub.ac.uk

Research Profile


Mode of Study

Full-time: 3.5 years


Funding Body
EPSRC
Apply now Register your interest

Civil Engineering overview

The research centre will address the topical grand challenges in civil engineering field, building on existing and developing new international collaborations. Financial support to meet these challenges will be acquired through both internal University initiatives (for enhanced infrastructure and facilities) and external funding from government grants, charities and direct industrial support.

Research will address the grand challenges of energy, carbon, clean water, infrastructure; exploring extremes and defining new limits. Key research areas include:

Marine renewable energy
Groundwater and environmental systems
Geotechnics
Intelligent infrastructure and high performance structures
Energy efficient materials

Mode of study / duration

Registration is on a full-time or part-time basis, under the direction of a supervisory team appointed by the University. You will be expected to submit your thesis at the end of three years of full-time registration for PhD, or two years for MPhil (or part-time equivalent).

Civil Engineering Highlights
Global Opportunities
  • Civil Engineering brings together researchers from spatial planning, architecture, geography, paleoecology and civil engineering to tackle some of the world's most pressing urban and environmental challenges.
    https://www.qub.ac.uk/schools/NBE/Research/
Industry Links
  • Civil Engineering is led by a Head of Discipline supported by team leaders with responsibility for maintaining excellence in its research groups. One of these, the Intelligent and Sustainable Infrastructure Group (ISIG - including low carbon structural materials) has several joint projects with international Centres of Excellence. Further information about our research groups can be found on the School website.
    https://www.qub.ac.uk/schools/NBE/Disciplines/civil-and-structural-engineering/
World Class Facilities
  • The School of Natural and Built Environment has a range of state-of-the-art facilities to support our outstanding students and staff conducting leading-edge research and teaching. These include a heavy structures laboratory, rheology laboratory, the Belfast Wave Flume and the Portaferry coastal wave basin.
    https://www.qub.ac.uk/schools/NBE/Research/facilities-infrastructure/
Student Experience
  • Postgraduates form an intrinsic part of our research community and are actively involved in the School's cross-disciplinary Research Groups, enabling the creation of synergies in areas such as sustainability, infrastructure, culture, design and heritage. The School is engaged with major research themes such as urbanism, community, heritage, population and climate change which contributes to the development of policy and practice both locally and globally. Visit our School website and read about the exciting research being undertaken by our current PhD students:
    https://www.qub.ac.uk/schools/NBE/Study/PostgraduateResearch/
Key Facts

Civil Engineering at Queens is in the Top 200 in the World QS Rankings (2022).

  • Civil Engineering is ranked 20th in the UK (Times and Sunday Times Good University Guide 2022).

Course content

Research Information

Associated Research
The dynamic nature of this research has been key to the our success in attracting significant funding from UK research councils, government departments and agencies.
The Civil Engineering Research Centre (CERC) is a leading international, interdisciplinary centre that enables scientists and engineers from all areas of civil engineering investigation to work on diverse, yet complementary research.
A special feature of the CERC is the extensive and diverse range of research topics being researched by students and staff in the Centre.

Career Prospects

Introduction
Many of our PhD graduates have moved into academic and research roles in Higher Education while others go on to play leading roles in educational practice, the public sector or within NGO’s. Queen's postgraduates reap exceptional benefits. Unique initiatives, such as Degree Plus and Researcher Plus bolster our commitment to employability. For further information on career opportunities at PhD level please contact the Faculty of Engineering and Physical Sciences Student Recruitment Team on askEPS@qub.ac.uk. Our advisors - in consultation with the School - will be happy to provide further information on your research area, possible career prospects and your research application.

People teaching you

Dr David Hester
Senior Lecturer
Natural and Built Environment

Dr Giuseppina Amato
Senior Lecturer
Natural and Built Environment

Dr Louise Kregting
Senior Lecturer
Natural and Built Environment

Dr Madjid Karimirad
Senior Lecturer
Natural and Built Environment

Dr Mohammed Sonebi
Professor
Natural and Built Environment

Dr Myra Lydon
Royal Academy of Engineering Research Fellow
Natural and Built Environment

Dr Raymond Flynn
Senior Lecturer
Natural and Built Environment

Dr Rory Doherty
Senior Lecturer
Natural and Built Environment

Dr Siobhan Cox
Senior Lecturer
Natural and Built Environment

Dr Sree Nanukuttan
Senior Lecturer
Natural and Built Environment

Dr Ulrich Ofterdinger
Reader
Natural and Built Environment

Professor G Hamill
Professor
Natural and Built Environment

Professor Marios Soutsos
Professor
Natural and Built Environment

Professor Wei Sha
Professor
Natural and Built Environment

Learning Outcomes
A research degree offers students an opportunity to foster their capacity for independent research and critical thought. It also allows students to explore an area of interest and so understand and solve theoretical and practical problems within the field.

Undertaking a research degree also enhances a student’s written and oral communication skills, and a PhD is almost always a formal requirement for an academic post.
Course structure
You will carry out original research under the guidance of your supervisory team. There is no specific course content as such. This independent research is complemented by postgraduate skills training organised by Queen’s Graduate School, and other internal and external training courses organised through your supervisor.

You will normally register, in the first instance, as an ‘undifferentiated PhD student’ which means that you have satisfied staff that you are capable of undertaking a research degree. The decision as to whether you should undertake an MPhil or a PhD is delayed until you have completed ‘differentiation’.

Differentiation takes place about 9-12 months after registration for full time students and about 18-30 months for part time students: You are normally asked to submit work to a panel of up two academics and this is followed up with a formal meeting with the ‘Differentiation Panel’. The Panel then make a judgement about your capacity to continue with your study. Sometimes students are advised to revise their research objectives or to consider submitting their work for an MPhil qualification rather than a doctoral qualification.

To complete with a doctoral qualification you will be required to submit a thesis of no more than 80,000 words and you will be required to attend a viva voce [oral examination] with an external and internal examiner to defend your thesis.

A PhD programme runs for 3-4 years full-time or 6-8 years part-time. Students can apply for a writing up year should it be required.

The PhD is open to both full and part time candidates and is often a useful preparation for a career within academia or consultancy.

Full time students are often attracted to research degree programmes because they offer an opportunity to pursue in some depth an area of academic interest.

The part time route is a suitable option for those unable to study for a PhD full time. This may be due to family commitments or those already in employment. On the former, studying part time for a PhD can be very accommodating in juggling different responsibilities. On the latter, part time candidates often choose to research an area that is related to their professional responsibilities.

If you meet the Entry Requirements, the next step is to check whether we can supervise research in your chosen area. We only take students to whom we can offer expert research supervision from one of our academic staff. Therefore, your research question needs to engage with the research interests of one of our staff.

Application Process
Please review the eligibility criteria on the webpages. If you believe that you meet these criteria then follow the steps below:

Select ONE potential supervisor from our list of Academic Staff (https://www.qub.ac.uk/schools/NBE/OurPeople/AcademicandResearchStaff/) and send an email containing:

a brief CV (1-2 pages maximum)
a concise statement that you are interested in studying for a PhD, stating when you would start, and how you would plan to fund the research
a brief statement of the research question or interest, and how you think the question could be investigated

Our academic staff welcome approaches from prospective students; staff can liaise with applicants to develop a research proposal of mutual interest. The potential supervisor should get back to you within a couple of weeks. They may invite you to meet with them or they may invite you to apply formally.

If you have difficulty identifying or contacting an appropriate supervisor, please contact Catherine Boone (email: pgr.snbe@qub.ac.uk) who will be happy to help.

For part-time study – the closing date for this option is 31st August each year.

For full-time study (self-funding) – for those full time candidates who do not wish to compete for a studentship or who are not eligible to compete for a studentship the closing date is 31st August each year.

For full-time study and application for a studentship/award; please be aware that awards are only available to full time students. Candidates wishing to apply for studentships available within the School must apply for full-time study at the same time. Available studentships and closing dates are detailed on the School's studentships web page: https://www.qub.ac.uk/schools/NBE/Study/PostgraduateResearch/ResearchStudentships/
Assessment

Assessment processes for the research degree differ from taught degrees. Students will be expected to present drafts of their work at regular intervals to their supervisor who will provide written and oral feedback; a formal assessment process takes place annually.

This Annual Progress Review requires students to present their work in writing and orally to a panel of academics from within the School. Successful completion of this process will allow students to register for the next academic year.

The final assessment of the doctoral degree is both oral and written. Students will submit their thesis to an internal and external examining team who will review the written thesis before inviting the student to orally defend their work at a Viva Voce.

Feedback

Supervisors will offer feedback on draft work at regular intervals throughout the period of registration on the degree.

Entrance requirements

Graduate
The minimum academic requirement for admission to a research degree programme is normally an Upper Second Class Honours degree from a UK or ROI HE provider, or an equivalent qualification acceptable to the University. Further information can be obtained by contacting the School.

International Students

For information on international qualification equivalents, please check the specific information for your country.

English Language Requirements

Evidence of an IELTS* score of 6.5, with not less than 5.5 in any component, or an equivalent qualification acceptable to the University is required. *Taken within the last 2 years.

International students wishing to apply to Queen's University Belfast (and for whom English is not their first language), must be able to demonstrate their proficiency in English in order to benefit fully from their course of study or research. Non-EEA nationals must also satisfy UK Visas and Immigration (UKVI) immigration requirements for English language for visa purposes.

For more information on English Language requirements for EEA and non-EEA nationals see: www.qub.ac.uk/EnglishLanguageReqs.

If you need to improve your English language skills before you enter this degree programme, INTO Queen's University Belfast offers a range of English language courses. These intensive and flexible courses are designed to improve your English ability for admission to this degree.

Tuition Fees

Northern Ireland (NI) 1 TBC
Republic of Ireland (ROI) 2 TBC
England, Scotland or Wales (GB) 1 TBC
EU Other 3 £25,600
International £25,600

1 EU citizens in the EU Settlement Scheme, with settled or pre-settled status, are expected to be charged the NI or GB tuition fee based on where they are ordinarily resident, however this is provisional and subject to the publication of the Northern Ireland Assembly Student Fees Regulations. Students who are ROI nationals resident in GB are expected to be charged the GB fee, however this is provisional and subject to the publication of the Northern Ireland Assembly student fees Regulations.

2 It is expected that EU students who are ROI nationals resident in ROI will be eligible for NI tuition fees. The tuition fee set out above is provisional and subject to the publication of the Northern Ireland Assembly student fees Regulations.

3 EU Other students (excludes Republic of Ireland nationals living in GB, NI or ROI) are charged tuition fees in line with international fees.

All tuition fees quoted are for the academic year 2021-22, and relate to a single year of study unless stated otherwise. Tuition fees will be subject to an annual inflationary increase, unless explicitly stated otherwise.

More information on postgraduate tuition fees.

Civil Engineering costs

There are no specific additional course costs associated with this programme.

Additional course costs

All Students

Depending on the programme of study, there may also be other extra costs which are not covered by tuition fees, which students will need to consider when planning their studies . Students can borrow books and access online learning resources from any Queen's library. If students wish to purchase recommended texts, rather than borrow them from the University Library, prices per text can range from £30 to £100. Students should also budget between £30 to £100 per year for photocopying, memory sticks and printing charges. Students may wish to consider purchasing an electronic device; costs will vary depending on the specification of the model chosen. There are also additional charges for graduation ceremonies, and library fines. In undertaking a research project students may incur costs associated with transport and/or materials, and there will also be additional costs for printing and binding the thesis. There may also be individually tailored research project expenses and students should consult directly with the School for further information.

Bench fees

Some research programmes incur an additional annual charge on top of the tuition fees, often referred to as a bench fee. Bench fees are charged when a programme (or a specific project) incurs extra costs such as those involved with specialist laboratory or field work. If you are required to pay bench fees they will be detailed on your offer letter. If you have any questions about Bench Fees these should be raised with your School at the application stage. Please note that, if you are being funded you will need to ensure your sponsor is aware of and has agreed to fund these additional costs before accepting your place.

How do I fund my study?

1.PhD Opportunities

Find PhD opportunities and funded studentships by subject area.

2.Funded Doctoral Training Programmes

We offer numerous opportunities for funded doctoral study in a world-class research environment. Our centres and partnerships, aim to seek out and nurture outstanding postgraduate research students, and provide targeted training and skills development.

3.PhD loans

The Government offers doctoral loans of up to £26,445 for PhDs and equivalent postgraduate research programmes for English- or Welsh-resident UK and EU students.

4.International Scholarships

Information on Postgraduate Research scholarships for international students.

Funding and Scholarships

The Funding & Scholarship Finder helps prospective and current students find funding to help cover costs towards a whole range of study related expenses.

How to Apply

Apply using our online Postgraduate Applications Portal and follow the step-by-step instructions on how to apply.

Find a supervisor

If you're interested in a particular project, we suggest you contact the relevant academic before you apply, to introduce yourself and ask questions.

To find a potential supervisor aligned with your area of interest, or if you are unsure of who to contact, look through the staff profiles linked here.

You might be asked to provide a short outline of your proposal to help us identify potential supervisors.

Download Postgraduate Prospectus