Cluster “LIFETIME”

Cluster “LIFETIME” projects:

• LIFECON (Coordinator VTT, Finland)• EUROLIFEFORM (Coordinator Taylor Woodrow, United Kingdom)• INVESTIMMO (Coordinator CSTB, France)• LICYMIN (Coordinator ICSTM, United Kingdom)• CONLIFE (Coordinator Universität Essen, Germany)

Cluster “LIFETIME” coordinating organisations:

• VTT Technical Research Centre of Finland, FI (coordinator of the cluster: Prof. Dr. Asko Sarja, asko.sarja@vtt.fi)• Taylor Woodrow Construction Ltd, UK• CSTB Centre Scientifique et Technique du Bâtiment, FR• Imperial College of Science, Technology and Medicine, UK• Universität Essen, DE

Cluster “LIFETIME” consists of five EU Growth programme projects, with objective to integrate the knowledge of partners of these projects for advancing the work and results of all projects, and to produce an

integrated and generic “European Guide for Lifetime Design and Management of Civil Infrastructures and Buildings”

Project: C O N L I F ECoordinator: Universität Essen, IBPM, Germany. Prof. Dr. Max J. Setzer, mj.setzer@uni-essen.de

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

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

Freeze-thaw

Frost-salt

Cyclic temperature

Acid

Seawater

Shrinkage

Fire

(A) Mix design/ composition

(B) Production

(C) Fresh concreteproperties

(D) Hardened concrete properties

Rheology, workability, etc.

Strength, pore size distr.,etc.

Durability

Des

crip

tio

n o

f d

eter

iora

tio

n p

roce

ss a

nd

d

efin

itio

n o

f re

com

men

dat

ion

s fo

r ap

pli

cati

on

Applied test procedure

Per

form

ance

of

HP

C u

nd

er d

iffe

ren

t ex

po

sure

co

nd

itio

ns

(D)

Exposure classes (EN206)

Implementation of test procedure

Amendments of test method for HPC

Lab performance

Field performance

Review of in-service structure

General assessment and recommendations for mix designs

Service-life evaluation

↑ Comparison of laboratory and field exposure in Finnish -40C environment, for an HPC mixture with a w/b=0.42, 7% silica fume and non-air entrained

0.0

0.1

0.2

0.3

0.30 0.35 0.42 0.50water/binder ratio

Sh

rinka

ge

[mm

/m]

Drying

Autogenous

OPC

e.g. shrinkage

← Effect of w/b ratio on drying and autogenous shrinkage, for HPC and OPC (w/b=0.50).

21

6menv,

pc

b

x D

a

K

fxt

e.g.

seawater

0,125 mm e.g. frost-salt

Exposed aggregate from severe scaling of surface paste layer ↓

Main output: Manual with recommendations and hints regarding HPC application and service-life estimation, including acceptance criteria and production rules(2) (Fig.2)

20

40

60

80

100

0 20 40 60 80 100Lab test duration [ftc]

RD

M [%

]

laboratory resistance

field resistance

critical

1st Winter 2nd Winter

Accelerated lab testingsimulation of attack type standardized by test methods, testing of 66 mixes

Field testing of 22 mixes per region at totally 9 teststations all over Europe, coveringdifferent climatic conditions

Analysis of in-service structures app. 60 existing structures with

differences of climate, application type and mix design

Work program:

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

Investigation of all relevant HPCproperties with identification of damage mechanisms, service-life estimation and final definition of hints (Fig.1)

e.g. frost

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)

Fig.1: Summary of work program

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.

Prediction of corrosion initiation periodwhere:

Variation of additives +admixtures, cement, air

Mixing order, SP dosage,etc.Lab testingby appropriate test methods

Mix

des

ign

an

d p

rod

uct

ion

ru

les

(A),

(B

)

Pro

per

ties

of

HP

C (

C),

(D

)

Inpu

t of

dat

a in

to d

atab

ase