The experiment was carried out on fine uniform sand and fine uniform humus sand. Soil samples were collected from the surface of forest dirt roads located in the Noteć Primeval Forest. Portland cement and multi-component Portland cement were used for stabilization. Cement-soil mixtures were prepared with four doses (3, 6, 9, 12%) of both cements. Samples for strength tests were stored under conditions of optimum humidity, water saturation, freezing and thawing. Testing results were compared to strength criteria for road surfaces according to Polish Standard PN-S- 96012, 1997. Generally it was found that both soils, especially humus sand, are difficult to stabilize with cements. Portland cement exhibited 2-times better stabilization effects in comparison to multi-component cement. Mixes showed high water resistance and low freeze resistance. For the lower layer of reinforced subgrade compression strength criteria were met by fine humus sand with a 9% addition of Portland cement and fine sand with a 9% addition of multicomponent cement. For the upper layer of reinforced subgrade strength criteria were met only by the mixture of fine sand with a 12% addition of Portland cement. Further tests are required using larger doses of Portland cement and after testing of grain size upgrading ...
The Promotion Forest Complexes are a functional areas in peculiarities about to ecological meaning, educational and social. The own name Promotion Forest Complex (PFC) Rychtalskie Forest is accepted from a situated forests on precinct Rychtal of Forest Inspectorate Syców. This forests of precinct are celebrated from ekotype ordinary pine, about unrepeatable genetic values, confirmed in scientific investigations. Total area of the PFC Rychtalskie Forest carries out 47 992 ha, in this Forest Inspectorate Antonin 19915 hahectare, Forest Inspectorate Syców 22 140 ha, and Forest Experimental Institution Experimental Siemianice 5938 ha. Generally, on the PFC Rychtalskie Forest area are: 57% coniferous forest, 37.5% broadleaved forest and 5.5% upland forest. In Forest Inspectorate Antonin greatest area occupies fresh coniferous forest. In Forest Inspectorates Syców and Siemianice dominates habitats of fresh mixed coniferous. On all area least participation has flooded forest. Defined, that under notion marshlands were described forest areas, forest ekosystems forest in excess wet, to which belongs initially these grounds, that are in forest descriptions classified as: Bb, BMB, LMB, Ol, OlJ and Lł (Polish standard). To detailed investigations are selected three experimental areas, microcatchments and 6 transects transverse to forest roads situated or in frames above mentioned areas or ...
