Concrete for infrastructure projects - Pre-construction phase

Claus  Pade

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Concrete for infrastructure projects - Pre-construction phase

Choice of materials and development of mix design (tendering and/or pre-construction phases)

DTI will assist with choice of the right materials and will develop and document mix design(s) that represent the optimum in terms of fulfilling requirements to execution and durability by making use of our concrete mixing station. The choice of constituents to be used in the concrete mix has impact not only on the cost of the concrete, but also on aspects of the execution. Different cement types (binder compositions) have different development heat and mechanical properties, which may have impact on e.g. the casting sequence and need for cooling pipes or insulation. Also, their durability performance are quite different.

Quality Assurance (tendering, pre-construction and construction phases)

DTI will provide all levels of assistance from constructing the complete QA system including procedures, work instructions, forms etc. to evaluation of your QA system (e.g. inspection and test plan) according to the requirements in the specifications. We have also experience in performing internal audits as well as audits of the suppliers. DTI will assume responsibility for non-conformance reporting (NCR) and associated communication with the Client.

Pretesting of concrete and constituents (pre-construction phase)

DTI can provide several tailored service packages including e.g.:

  • Setting up and staffing of an onsite laboratory performing all the required testing of the fresh and hardened concrete. If required the testing will be performed under accreditation.
  • Testing of input parameters required for temperature and stress calculations (under accreditation if required).
  • Establishing conformity to DS/EN ISO/IEC 17025:2005 of the concrete testing including management of the QA system, documentation of results and training of workers.
  • Compilation of pretesting reports with evaluation of requirements ready for submission to the Client.
  • Preparation of specifications for special concrete e.g. self-compacting concrete and steel fiber reinforced concrete.
  • General advice on results including proposals for potential improvement from e.g. fine tuning of mix design.

Full scale trial casting (pre-construction phase)

DTI can provide several tailored service packages including e.g.:

  • Temperature and stress calculations and subsequent planning, execution, monitoring and documentation of temperature in connection with the casting.
  • Documentation of the hardened concrete structure including surface finish, minimum cover to reinforcement and core drilling with associated testing of hardened concrete properties such as frost resistance, chloride migration coefficient and petrographic analysis under accreditation if required.
  • Compilation of full scale trial casting reports with evaluation of requirements ready for submission to the Client.
  • General advice on results including proposals for potential improvement from e.g. fine tuning of mix design and execution methods.

Repair work (pre-construction and construction phases)

DTI will provide recommendations for repair. Aided by non-destructive testing DTI will survey and categorize types of defects and provide recommendations for repair strategy. Evaluation of trial repairs and associated certification of the operators are provided.

Temperature and stress calculations (tendering, pre-construction and construction phases)

DTI will provided the required documentation related to early-age crack control from temperature and stress calculation. DTI will determine the necessary input parameters for the calculations and perform the calculation required to find the optimum execution procedure while ensuring fulfilment of requirements. In connection with full scale trial casting we will plan, execute, online monitor and document the control of temperature. DTI will provided the required documentation that the individual castings of permanent structures fulfil the requirements established during full scale trial casting. DTI will plan, execute, monitor in real time online and document the control of temperature using real time online technology.

Ad hoc general advice/documentation (pre-construction and construction phases)

DTI will provide advice on specialty matters. We have experience in dealing with all sorts of different concrete related issues that may occur during the pre-construction phase either internally within the consortium or be received from the Client, e.g. evaporation protection, formwork pressure, casting methods, constituents, mix designs, fulfilling of requirements, standards/codes.

Revisions to the specifications (pre-construction and construction phases)

DTI can provide the technical argumentation to support suggested changes to the specification proposed to the Client (Change Request).

Repair work (pre-construction and construction phases)

DTI will provide recommendations for repair. Aided by non-destructive testing DTI will survey and categorize types of defects and provide recommendations for repair strategy. Evaluation of trial repairs and associated certification of the operators are provided.