Forest communication network consists mainly of dirt roads. Technical
problems with forest roads transport occur especially for these dirt roads which are
constructed on cohesive topsoil. Lignite fly-ash may be utilized for successful stabilization
of cohesive topsoil dirt roads. The pavements stabilized with fly-ash often
perform unsatisfactorily under heavy loads and failures are noted as a result.
The research described in this paper aimed at developing technical solution for reconstruction
of road pavements constructed with admixture of fly-ash and fly-ashslug
respectively. Bearing strength variability of fly-ash-soil and fly-ash-slag-soil
mixes after failure and application of repair method were considered. Crushed then
re-compacted with addition of stabilizer soil mixes as influenced by period and
conditions of binding were tested. The stabilizers utilized for testing were both active
fly-ash of lignite group IIIC and coke blast furnace slag. Two varieties of
mixes were tested. These varieties were sandy clay mixed with addition of 14 %
lignite fly-ash and the mixture of 10 % lignite fly-ash and 10% furnace slag respectively.
The samples were crashed and re-compacted after 14- and 42-day period
of curing in optimal and air-dump conditions. After sample curing deformation
modules were measured with the utilization of VSS press. The deformation
module measurement procedure was the basis for assessment of the mixtures suitability
for reconstruction of forest road pavements after failure. Higher bearing
performance especially after air-dump curing occurred for sole fly-ash addition
mix varieties. The technical guidelines for reconstruction of road pavements with
utilization of re-used crashed pavement materials were developed as well. The
clayey pavements after failure may be stabilized again in fortnight period after
construction. The repair procedure includes re-compaction and watering to achieve
optimum moisture content. In addition, the optimum doses of stabilizer content for
the reconstruction after longer than forthright period since the road construction
were identified.
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