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Improved production of advanced concrete structures - planning and control of properties during hardening to enhance durability

Objective



During the construction phase and the subsequent life span of advanced concrete structures costs can be significantly reduced, in particular by avoiding premature damage in the construction stage. A fundamental issue in order to achieve this is proper planning and production of the structure. With e.g. new high performance concretes it is of the utmost importance that the right quality is maintained throughout the construction period. Otherwise heavy reduction in robustness and resistance can be the result. Crucial here is the risk of early age cracking of the concrete due to restrained volume changes from temperature and shrinkage during the hardening period.
An Expert System will be developed to plan and control the production of concrete structures. The Expert System will contain modules of varying simplicity and refinement which can be used in the following phases of a construction project:
the predesign phaseto get rough estimates of the cost and efficiency of alternative production methods
the design phasefor detailed planning of concreting (choice of materials, cooling and/or heating methods, insolation of formwork, formstripping time etc)
the construction phasefor updating the influence of weather changes, fluctuation of material properties and temperatures on target crack risks
the maintenance phaseto check maintenance costs and repair needs.
The overall savings using these tools will be in the order of 100 MECU/year in Europe for reduced production costs. To this will be added prolonged life time and reduced maintenance costs which can be estimated to 200300 MECU per year.
The project encompasses leading firms working in all of the four phases mentioned above i e consulting firms, contractors, material producers, owners and maintainers of structures as well as research institutions specialised in the different tasks of the project work.
The project will contain the following main tasks:
Mobilization and mangement of the project: Many partners are involved and it is important to coordinate the different tasks effectively
Hydration and volume changes: Tests will be performed in order to aquire data for the modelling of properties of a number of currently used concretes
Mechanical properties: Testing and modelling of mechanical properties
Behaviour of structures: Computer modelling of structural behaviour
Field tests: To check and improve the models of the previous tasks in full scale tests
Expert system: The results of the earlier tasks will be synthesized into a robust Expert System, which can be used for planning and control of the production of high quality concrete structures

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Scancem AB
Address
..,..
100 74 Stockholm
Sweden

Participants (12)

CESI CENTRO ELETTROTECNICO SPERIMENTALE ITALIANO GIACINTO MOTTA SPA
Italy
Address
Via Rubattino 54
Milano
Elkem ASA
Norway
Address
--,--
4602 Kristiansand
Enel.Hydro SpA
Italy
Address
Via Pastrengo
24068 Seriate
LULEAA UNIVERSITY OF TECHNOLOGY
Sweden
Address
Regnbagsallén, Porsön
97187 Lulea
NCC AB
Sweden
Address
Vallgatan 3
170 80 Solna
NORWEGIAN PUBLIC ROADS ADMNINISTRATION
Norway
Address
92,Grenseveien 92
0033 Oslo
Norcem AS
Norway
Address

3950 Brevik
Norges Teknisk-Naturvitenskapelige Universitet
Norway
Address
3C,richard Birkelandsvej
7034 Trondheim
SELMER SKANSKA AS
Norway
Address
25,Olavsgate 25
0166 Oslo
Skanska Teknik AB
Sweden
Address

182 25 Danderyd
TECHNISCHE UNIVERSITAET BRAUNSCHWEIG
Germany
Address
52,Beethovenstrasse 52
38106 Braunschweig
Technische Universiteit Delft
Netherlands
Address
1,Stevinweg 1
2628 BL Delft