Mass stabilization as a modern method of substrate strengthening

Abstract The aim of the paper is to show one of the soil strengthening technologies - mass mixing. Two variations are to be distinguish – dry and wet type. In the first case the binding process take place with the use of ground water and the binder (cement, fly ash). In wet mass mixing the soil; is mixed with cement or cement-fly ash grout. The application of each type is dependent of the type of soil and its moisture content. The paper describes case studies of dry type: S5 road in the section Korzensko – Widawa, open pool complex in Olawa, Szczecinek bypass. Wet type case study is described as well – part of the “Wiślanka” gallery in Żory and site in Warsaw. The analysis of mentioned case studies has shown that the technology can be used in all type of civil engineering objects. While it is one of the technologies which is based on mixing of the existing soil, it is especially important to do comprehensive soil investigation and trial mixes before the start of the jobsite. One of the advantages is that the quality control in case of wet mass mixing is made similarly to DSM (deep soil mixing).