GENERAL DESCRIPTION OF THE PROBLEM
The house was built between 1981-1982. It is constructed on a ribbon foundation, and the building itself is located on a natural slope. During construction, all organic materials were excavated, and the base was leveled by filling sand to the lower sections of the slope, as well as replacing the soil from the upper to the lower level. After finishing the foundation casting, heavy rain weakened and washed the compacted sand from the bottom of foundation. The sand was simply shoveled back without proper compaction. The loose soil caused cracks in the walls and a maximum of 87 mm of subsidence.
Seal loose sand and prevent future subsidence with minimal interference in the life of the family living in the house. Clients wanted to live in the house throughout the process.
After testing with a penetrometer, an improper compaction of the base soil was found. It was determined that for maximum results, compaction of the soil will be performed using expanding geopolymer columns and injection of geopolymers between them.
A test that was conducted after the project was completed showed a significant increase in the penetrometer values, from 3 to 31 and from 2 to 35 blows. After that, the team performing the injection came to the conclusion that the soil was adequately compacted. The entire project took less than a week, and the family lived in the house and led a normal family life.