Table 3.

Comparison of advantages and disadvantages of installation methods.

Mixing methodAdvantagesDisadvantages
PremixingCan be done by machineSeparation during transportation and installation
Risk of soil compaction in voids
Can require special mixing equipment
Water mixing during installationContact between stones is ensuredCan require large volumes of water
Independent of weatherMost suitable at large aggregate sizes
Prevents soil compaction
Dry mixing during installationContact between stones is ensuredDry weather required
Prevents soil compactionRequires dry soil
Sand mixRational mixing with right equipmentRisk of soil compaction to a degree that impedes root growth
Inexpensive ingredientsThe compaction level must be controlled
Easy to installPoor load-bearing capacity