| 023162 Gravel sub-base
Gravel sub-base shall be suitable approved by the engineer, crushed stone or naturally occurring gravel of specified size and finishing thickness laid on compacted fill or naturally occurring surface. The sub-base shall be well blinded to receive finish material.
Gravel surface shall be measured by the area of the surface on which it is laid.
023163 Hard core & stone filler
Hard core shall be sound approved stone of specified finishing thickness and placed as directed by the Engineer and finished blinded with 20mm crushed aggregate.
Hard core shall be measured by the area of the surface on which it is laid if the finished thickness does not exceed 300mm. Hard core and stone filling exceeding 300mm thickness shall be measured by the volume of void filled by the hard core or stone chipping.
The girths of sinking shall be taken as the surface area of hard core where such sinking occur.
023164 Dust blinding
Dust blinding shall be approved crushed stone dust from quarries for concrete aggregate production and shall be 50mm thickness finished true and level. Dust blinding shall be measured by the area of the surface on which it is laid.
023165 Slopes to embankments
"Slopes to embankments, cuttings, shoulders, ditches, etc., shall be trimmed to the dimension and inclinations shown on drawings. Excess material shall be removed. Depressions or voids that may be created during trimming shall be filled with the same material that is used to form the slopes and ditches.
Trimming of slopes shall be measured by length and shall be understood to cover the girth as detailed or specified in drawings or directed by the Engineer.
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