1. Mechanical Properties of Concrete Containing Natural Zeolite
Jaroslava KOŤÁTKOVÁ, Pavel REITERMAN
Czech Technical University in Prague, Faculty of Civil Engineering, Experimental Centre,
Thákurova 7, , Praha 6 Dejvice, Czech Republic

2. Contents Motivation Characterization of natural zeolite
Experimental program
Results
Conclusions

3. Motivation Development of HPC
Use of supplementary cementitious materials in concrete
Decrease in cement consumption
Enhancement of mechanical properties and durability
Availability, cost?
Silica fume x natural zeolite
→ ternary binders

4. Natural zeolite Volcanic highly porous rock
3D structure of tetrahedras SiO4 and AlO4
Pozzolanic properties
Interlinked channels of < 2 nm,
ability of ion exchange
Molecular sieve
Sorbent
Crystal structure of Na-clinoptilolite

5. Experimental program HPC Four fractions of silica aggregate
(maximum size 4 mm)
Inert filler – silica powder
Cement CEM I 52.5 R
Low w/c (0,21) + superplasticizer
Silica fume 140 kg/m3
10 – 60 % cement replacement by natural zeolite
Investigation of mechanical properties in time

6. Results – compressive strength

7. Results – flexural strength

8. Summary HPC with ternary binder system Compressive strength
Silica fume % of natural zeolite as SCM
Compressive strength
Decrease with rising amount of NZ due to unreacted particles
Visible rise after 1 year from manufacture – continuing pozzolanic reaction
Flexural strength
Slight decrease up to 180 days – microcracks
late strength – pozzolanic reaction prevailed, highest values for 20% replacement level

9. Thank you for your attention!!