Assessment of the technical and economic efficiency of the construction of logging roads made of fiber cement soil

The construction of logging roads should ensure standard quality indicators of road pavements at a minimum cost of work. Traditionally, road pavements are made from inert materials - crushed stone and sand. The difficult natural conditions of the forest zone and high transport loads require the use of significant volumes of inert materials, while the costs of their transportation significantly increase the total cost of the work. An effective technology in the conditions of a forest zone is the construction of road pavements from fiber cement soil, obtained by mixing local natural soil with the addition of Portland cement, fiber fiber and water. In comparison with the volumes of use of inert materials, the content of additives in the composition of fiber cement-soil mixtures is insignificant, which is an advantage for reducing transport costs and the cost of work in general. To assess the technical and economic efficiency, the design parameters and volumes of work for the construction of two equal-strength road pavements: from fiber cement soil and from inert materials (crushed stone and sand), a logging highway of category III, with a length of 1 km, were calculated. Calculations have been made and response surfaces have been compiled for the estimated cost of constructing these road pavement structures depending on the different transportation distances of the road building materials used. Based on the research results, it was determined that the parameters of the transport and logistics scheme for the delivery of materials significantly affect transport costs and the total estimated cost of construction. With an average hauling distance of up to 30 km, the estimated cost of installing fiber cement-soil road pavements is almost the same compared to using inert materials. When the distance for transporting road building materials increases to more than 30 km, the use of fiber cement-soil road pavements is cost-effective, relative to equal-strength structures made of crushed stone and sand. Nomograms have been developed for determining the cost of work on the construction of road pavements depending on the distance of transportation of road-building materials for the rapid assessment of the technical and economic efficiency of the construction of logging roads from fiber cement soil.

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