This paper addresses the assessment of the durability properties of mixtures of two soils using laboratory wetting and drying durability tests for forest road applications, as follows: (a) soils stabilization with the industrial waste grits; (b) soil improvement using lime or cement; (c) soil stabilization using grits, and soil mixture improvement using lime or cement. A mature and a young residual soil from the Zona da Mata Norte of Minas Gerais were used throughout the study. The laboratory testing program comprised the following steps: (a) grits content of 24 % in relation to soil dry mass; (ii) lime or cement contents of 10 % and 20 % in relation to grits dry mass; (c) specimens compacted at the standard and modified Proctor effort; (d) mixture specimens curing time of seven days in acclimatized room. The testing program data supported that: (a) the soil -lime, soil-cement, soil-grits-lime and soil-grits-cement mixtures endured all cycles in the durability test; (b) the mixtures of soil 1, grits and lime compacted at the modified Proctor effort presented the best mechanical response in the durability tests, showing losses of approximately 7 %; regarding soil 2 mixtures, the best result was related to the grits and cement mixtures compacted at the modified Proctor effort, showing losses of approximately 9 %; (c) as for durability standard requirements, the mixtures of soil-grits presented potential for road engineering applications only in association with lime or cement.
Soil stabilization; industrial waste grits; forest roads and durability tests
