Double bituminous surface treatment (DBST) is a process used in pavement construction that involves two separate applications of asphalt binder material and mineral aggregate on a prepared surface. Double bituminous surface treatments are used for surfacing roads and streets, parking areas, open storage areas, and airfield shoulders and overruns.A Impact crusher is producing double bituminous surface treatment (DBST) aggregate. Additional crushers continue to produce base course materials. A screening plant is producing sub-base materials. Sub-base has been placed between 16+220 and 16+480.The crushing plant is a two stage process with a primary jaw crusher and a secondary impact crusher with internal recirculation of oversize material.
Stone quarry / crushing plant
Stone Quarry is located approximately 500m from Engineer site camp road No 33 and 23km from Project Site – Currently extractions are at several levels on the side of the mountain – but good material of fresh rocks (Petrography Basalt family rock) are available only at the bottom/base of the mountain.
Fresh black rock is good for DBST crushed aggregates but not the yellow weathered rock at upper levels. Based on the visual inspection, the gradation and flakiness index of the present production of aggregate chips are not correct for road construction (base course pavement and DBST). Actually, the main products are for concrete. The correct scheme of crushing and screening is required in order to achieve a correct material for base course and crushed aggregates for DBST.
The crushing and screening plant can produce the correct materials for road aggregates unless there is enough equipment and follow the production line as per the above sketch. After re‐arranged the plant, surveys/controls and checking the grading, flakiness, hardness tests… will be required. Only the fresh black stone is good for DBST surface wearing course. Flakiness is a major problem and the correct fabrication/production is necessary for DBST. (All productions passed by gyratory crusher can give a good production/crushing unless the crusher is full of boulder rock).
The quarry and crushing plant is located ~500m from Engineer site camp along road No 33.Materials from this quarry are good for concrete but not good for base course or for DBST crushed aggregates. First, is the quality of material that only the fresh black rock at the bottom/base of the mountain are correct for hardness (LA) ‐ Second, the method of the present production is not correct, material with correct gradation and flakiness cannot be produced.
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