General requirements

163 PAVING
1631 General Requirement

The Specifications in the earthwork, masonry & concrete sections of this Technical Specification shall be equally applicable to works under this section in as long as the work is related.

1632 Excavation, Fill, Disposal & Trimming of Slopes

Comply with the requirement of the Specification in the Earth Work Section of this Technical Specification for excavation, fill, disposal and trimming of slopes under external paving.

1633 Sub-Base

Hard-core sub-base shall be in basalt or other sound stone approved by the Engineer, having a finished uniform thickness of 200mm, finished compacted to the approval of the Engineer.

Materials forming direct support of pavement shall be hard durable stone chips, gravel or other selected fill material, well graded to the required sizes.
The material shall be free from vegetable matter & clay lumps.
Naturally occurring sub-base material shall be scarified, watered, uniformly mixed and compacted to at least 95% MDD. Where improved sub-base is to be placed, the upper 150mm of soil under the improved sub-base shall be compacted to 95% MDD.
The improved sub-base shall be placed on the sub-soil, watered & compacted at 200mm thickness to a dry density of 95% MDD. Sub-grade shall be cleaned off all foreign material.

Potholes, loose material, corrugations, depressions and other defects appearing on sub-base shall be corrected to the satisfaction of the Engineer.

The final surface of sub-base shall be graded to levels, and profiles, (cross falls, camber, etc.) shown on drawings or directed by the Engineer. If sub-base finish is not executed to the satisfaction of the Engineer, the contractor shall scarify, grade, re-compact and finish the surface at his own cost and to the Engineer's approval.
Sub-base work shall be measured by the volume of material cut and filled in naturally occurring sub-base base, and the volume of filed material in improved sub-base and shall be understood as including all related work.