Title: Data to support "A survey on problems encountered in current concrete construction and the potential benefits of self-healing cementitious materials"

Citation
Gardner DR, Lark RJ, Jefferson AD, et al. (2018). Data to support "A survey on problems encountered in current concrete construction and the potential benefits of self-healing cementitious materials". Cardiff University. http://doi.org/10.17035/d.2018.0045754162


Access Rights: Data can be made freely available subject to attribution
Access Method: Click to email a request for this data to opendata@cardiff.ac.uk

Dataset Details
Publisher: Cardiff University
Date (year) of data becoming publicly available: 2018
Coverage start date: 28/07/2017
Coverage end date: 10/09/2017
Data format: .pdf, .xlsx
Estimated total storage size of dataset: Less than 100 megabytes
Number of Files In Dataset: 3
DOI: 10.17035/d.2018.0045754162

Description

This dataset presents the market research conducted as part of an EPSRC research grant. The repair, maintenance and replacement of civil engineering infrastructure attracts significant expenditure in the UK. Anecdotal evidence suggests that a significant number of existing and new concrete structures suffer from repair and maintenance problems, but a lack of objective construction industry supported data concerning these problems makes it difficult to establish, with any certainty, the actual problems encountered in current concrete construction in the UK. A market research exercise was commissioned to not only address this lack of data but explore the appetite and potential use of self-healing cementitious materials in the construction industry. The full market research results are found in the report (.pdf) which presents all of the data collected through the market research exercise. The separate excel files associated with the data are those which have been recreated from the data contained in the report to use for publication. The market research was conducted using a range of client, contractor and consultancy participants and the results are presented either in these categories or considered all together as an industry wide response. The data/report also contains comments from industry on a series of self-healing technologies. A summary of comments from a breakout session at a CIRIA/M4L conference conducted on behalf of the M4L research team is also included. For the main market research exercise the questions posed to the market were as follows:

 Q1.
To help us understand needs, firstly some general questions. Have you in the
last 5 years had any of these client requirements which have influenced the
performance requirements for the general material selection in your projects? (selection
from a predefined list and free-text ‘other’ option)

 Q2.
Have any others of these influenced the approach to, design or use of concrete
either in-situ or precast in the last 5 years?

 Q3.
Which of these issues with concrete structures have you experienced in the last
5 years? (selection from a predefined list and free-text ‘other’ option)

 Q4.
What type of structures have you found to be particularly vulnerable to these
issues? (Free-text answer)

 Q5.
Have these issues been experienced during the.(i) Curing and setting time (ii)
Early service life (iii) longer service life or (iv) Don't know

 Q6.
What has been the consequence of these issues? (selection from a predefined
list and free-text ‘other’ option)

 Q7.
Thinking of your last 2 projects involving concrete structures or
sub-structures, which of these issues or threats to the integrity of the
concrete were taken into account in the design and or mix? (selection from a
predefined list and free-text ‘other’ option)

 Q8.
Which is the most difficult or challenging issue to overcome?

 Q9.
Which of these performance enhancements have been built into the concrete
design, specification or mix on your last 2 projects? (selection from a predefined
list and free-text ‘other’ option)

 Q10.
What specific chemical deterioration did you take into account? (selection from
a predefined list and free-text ‘other’ option)

 Q11.
On your last 2 projects, which of these measures did you use to provide
protection to the concrete and reinforcement? (selection from a predefined list
and free-text ‘other’ option)

 Q12.
You said yes to over-design of service loads, can you give an estimate of the
percentage of the designed loading expected to be used in service?

 Q13.
Which would you say are the most common measures used to provide durability and
protection to concrete structures within the civils projects in which you have
been involved over the last 5 years? (selection from a predefined list and
free-text ‘other’ option)

 Q14.
What in your view are the impacts of current approaches to prolonging the life
of concrete? These could include environmental, social or cost factors.
(Free-text answer)

 Q15.
Do you feel that issues with concrete being designed and used currently on your
projects will, over the anticipated life, require: (i) A lot of maintenance
(ii) Some maintenance (iii) Very little maintenance (iv) Some maintenance but
don't know how much (v) Varies

 Q16.
What consequential effects will or could maintenance have, for example
disruption to use etc? (Free-text answer)

 Q17.
Can you give some examples of the types of structures or applications where
maintenance is particularly required?

 Q18.
And is there any particular part of the concrete structures with which you are
involved where maintenance and repair could be required, i.e. it is
particularly vulnerable? (Free-text answer)

  Q19.
Cardiff University and partners are working on a range of self-diagnosing and self-healing
technologies which respond to and treat specific issues with concrete. These
would be incorporated within concrete specifications and mixes. The research is
at a stage where guidance is required from the market on the most appealing
benefits and application of these techniques. From the key benefits listed
which holds appeal, in principle? (selection from a predefined list)

 Q20.
Which holds the greatest appeal?

 Q21.
Assuming the product was fully tested and had appropriate certification, where
can you see these features being used, and to overcome what issues or problems?
(Free-text answer)

 Q22.
Taking into account the self-diagnosing, self-healing and more ductile benefits
of the new technologies, again assuming full testing and proven use, in which
of these structures or any others do you feel a self-healing concrete could
have particular appeal? ? (selection from a predefined list)

 Q23.
Are there any specific applications or elements within those you have mentioned
where self healing concrete may be particularly suitable? (Free-text answer)

 Q24.
Do you have any other suggestions for applications of self-healing concrete or
project types where in principle the healing properties and more ductile
material would be particularly suited? (Free-text answer)

Q25.
If the new self-healing concrete cost 20% more than a standard concrete mix in
materials cost only, but the cost to install remained the same, where would it
most be of value to justify the cost? (Free-text answer)

 Q26.
What would be the main benefit to justify paying a premium? (Free-text answer)

 Q27.
Which of these benefits would you expect of a self-healing concrete, in
principle? (selection from a predefined list)

 Q28.
Again in principle, assuming the material was proven in use, which would be the
1st, 2nd and 3rd in order of their benefit for you and your type of work?
(Ranked list of Q27)

 Q29.
How important is it to you that any new concrete can be pumped and how
important that it can be sprayed?

 The
new techniques are capable of introducing a range of new materials into the
concrete, either on their own or in conjunction. These include: *Microcapsules
which rupture in response to environmental triggers, to deliver chemical
healing agents throughout the mix *Dormant bacteria which activate to seal
cracks in response to water or chemical ingress *Synthetic polymers built into
the Concrete which can be used to create compressive forces to close cracks
*Flow networks which are a series of capillary like tubes built in to the concrete
to allow the distribution of chemical healing agents and fillers when needed

 Q30.
Do you have any comments or reactions to these? (Free-text answer)

 Q31.
Do you have any points or queries to be passed back to the research team? All
questions are welcomed. (Free-text answer)

 Q32.
Thank you. To help with our analysis can you confirm the type of structures in
which you have been involved over the last 2 projects? (Free-text answer)

Research results based upon these data are published at https://doi.org/10.1016/j.cscm.2018.02.002



Keywords

reinforced concrete sections, Self-healing, self-healing polymers

Related Projects

Last updated on 2018-15-05 at 13:30