Cluster

1
Life-time prediction of high-performance concrete
with respect to durability
Major Objective Development of deterioration
models and life-time design concepts for
high-performance concrete (HPC) under different
environmental conditions and exposure classes
Work program
Investigation of all relevant HPCproperties with
identification of damage mechanisms,
service-life estimation and final definition of
hints (Fig.1)
Variation of additives admixtures, cement, air
(A) Mix design/ composition
Mixing order, SP dosage,etc.
(B) Production
Lab testing by appropriate test methods
Rheology, workability, etc.
(C) Fresh concrete properties

• Results
• Understanding and avoidance of damages of HPC
  due to practical conditions
• Know-how about optimal composition of HPC mix
  designs with regard to rheological aspects and
  damage protection
• Adjustment of existing test methods to the
  behaviour of HPC
• Estimation of a service-life of HPC constructions
  under various climates
• Achievement of a fundamental database and an
  unified European level

Strength, pore size distr.,etc.
(D) Hardened concrete properties
Accelerated lab testing simulation of attack type
standardized by test methods, testing of 66 mixes
Durability
Freeze-thaw
Description of deterioration process and
definition of recommendations for application
Input of data into database
Frost-salt
Cyclic temperature
Field testing of 22 mixes per region at totally
9 teststations all over Europe,
covering different climatic conditions
Acid
Seawater
Analysis of in-service structures app. 60
existing structures with differences of climate,
application type and mix design
Fire
Shrinkage
Fig.1 Summary of work program
Main output Manual with recommendations and
hints regarding HPC application and service-life
estimation, including acceptance criteria and
production rules(2) (Fig.2)
? Effect of w/b ratio on drying and autogenous
shrinkage, for HPC and OPC (w/b0.50).
Applied test procedure
Implementation of test procedure
Exposed aggregate from severe scaling of surface
paste layer ?
Amendments of test method for HPC
e.g. shrinkage
Lab performance
Performance of HPC under different exposure
conditions (D)
Field performance
Mix design and production rules (A), (B)
Properties of HPC (C), (D)
e.g. frost-salt
Review of in-service structure
e.g. frost
General assessment and recommendations for mix
designs
e.g. seawater
Service-life evaluation
Exposure classes (EN206)
Prediction of corrosion initiation period
where
t period of corrosion initiation in year, xc
cover thickness in mm, a, b regression
constants, a 0.212 and b 1.53, D6m the
diffusivity measured at 6 months age by the CTH
method fp factor describing effect of
pozzolanic additives on chloride threshold
Kx,env environmental factor.
? Comparison of laboratory and field exposure in
Finnish -40?C environment, for an HPC mixture
with a w/b0.42, 7 silica fume and non-air
entrained
Fig.2 Overview of manual structure, divided into
the above sub-chapters for each of the
investigated exposure type - example of
results(1),(2),(3)
Publications (1) M.J. Setzer, S. Palecki
Proceedings of international conference on
durability of HPC and final workshop of CONLIFE,
23-24 September 2004, Essen, Germany, ISBN 3 931
681 807 (2) CONLIFE Manual with
recommendations for application of HPC database
as CD-rom, published and distributed by MC
Bauchemie, September 2004 (3) CONLIFE web
page http/fasae.ibpmw.uni-essen.de/euproject ,
deliverable reports 1-10