Abstract
Extensive research and practical experience have shown
that partial replacement of cement by metakaolin improves
concrete durability as a result of the refinement of the
pore structure. While literature confirms much research
on the performance of concrete with metakaolin, it is
scarce concerning the performance with regards to
chloride penetration, and the effect on the service life
of reinforced concrete structures.
In this study, several concrete mixes were cast with
varying cement type and content and were evaluated for
their chloride penetration performance. Reference mixes
where made with CEM I 42,5R and CEM IV/A 42,5 type
cements. Two cement contents levels where defined: 330
kg/m3 and 440 kg/m3 based on mix designs currently used
in the ready-mix industry for C20/25 and C30/37
concretes. Cement was replaced with metakaolin with
levels varying from 10 - 20%. All concretes where tested
for fresh properties, compressive strength, electrical
resistivity and chloride diffusion characteristics
(migration and ponding), and mercury intrusion
porosimetry.
The results demonstrate the improved resistance to
chloride penetration of concretes with metakaolin
additions. A beneficial effect on strength and durability
properties of metakaolin was also observed. In addition,
service life design calculations of reinforced concrete
structures in marine environment based on the performance
indicators obtained show a significant increase in the
time to fulfil the serviceability limit state of
corrosion initiation
| Original language | English |
|---|---|
| Title of host publication | ICDC 2012, International Congress on Durability of Concrete |
| Publisher | Norsk Betongforening |
| ISBN (Print) | 978-8-2820-8031-6 |
| Publication status | Published - 2012 |
| MoE publication type | Not Eligible |
| Event | International Congress on Durability of Concrete, ICDC 2012 - Trondheim, Norway Duration: 18 Jun 2012 → 21 Jun 2012 |
Conference
| Conference | International Congress on Durability of Concrete, ICDC 2012 |
|---|---|
| Abbreviated title | ICDC 2012 |
| Country/Territory | Norway |
| City | Trondheim |
| Period | 18/06/12 → 21/06/12 |
Keywords
- durability
- metakaolin
- chloride
- electrical resistivity
- service life
- addition