A Laboratory Simulation of In-Situ Grouting Using Standard Portland Cement and Polyurethane Materials with Standard Methods

Grouting features below ground is a common construction activity. The main purposes for placing grout have been previously identified (Shannon and Wilson, 1987), and are: 1) lower permeability, 2) reduce hydrostatic pressures under structures, 3) reduce water losses, 4) increase strength and bearing capacity, 5) stabilize rocks and subgrades, 6) backfill annular openings, and 7) fill cavities. Various requirements on the need for additional research have been identified in the review of the state-of-the-practice in grouting (Shannon and Wilson, 1987). One suggestion was the use of laboratory models as an interim step between theoretical mathematical models and full scale field tests. The objectives of this research study were to develop procedures and to perform tests to satisfy some of these previously suggested research needs. In-situ conditions were simulated in the laboratory, portland cement grout and polyurethane grout were placed under field-like conditions, and the grouted features were recovered for forensic testing and analysis of performance. Grout properties were measured and grouted modules were examined.