Abstract
Microbial calcite precipitation has been intensively studied recently for the improvement of
compressive strength and durability of concrete, including those with pozzolanic materials such
as metakaolin (MK), fly ash (FA), and silica fume (SF). Such materials possess high pozzolanic
activity and have become an essential part of high strength and high performance concrete mix
design. However, when replacing cement at high proportion, it has been found that such
materials can cause a decrease of freeze-thaw resistance and early age strength of concrete. To
remedy the defects, microbial calcite precipitation, a continuous extracellular cementation
process dominated by bacteria, has been used to improve the engineering properties of such
concrete. This article gives an overview of the biocementation process for the improvement of
compressive strength and durability of concrete where cement was partially replaced with mk,
fa, and sf. It has been found that properties like compressive strength, and durability of
pozzolanic concrete can be improved with microbial calcite precipitation
| Original language | French |
|---|---|
| Title of host publication | RILEM Publications |
| State | Published - 2018 |
| Externally published | Yes |
Keywords
- pozzolanic macterials
- bacteria
- microbial concrete
- durability