Choosing fill is more than selecting soil that compacts. This QUACRAFT episode examines material selection and soil suitability under MoRTH Clause 305.1.1 and 305.2.1.

Topics: approved materials; unsuitable fill; expansive-soil zoning; sulphates near permanent works; particle sizes and Engineer discretion; Table 300-1 laboratory dry-unit-weight suitability; design CBR; stabilization approval; material strength for high embankments.

Primary reference: MoRTH Specifications for Road and Bridge Works, Fifth Revision (2013).

QC review copy — technical narration and complete subsection coverage remain under review. Corrected visual cards address free swelling index, particle-size limits and heavy laboratory compaction.

Educational illustrations and recommended QA/QC records support understanding. Governing contract, specification edition, drawings, approved methods and Engineer directions control actual construction. Laboratory material suitability and field relative compaction are different checks.

Previous: Clause 305 Part 1 overview
Next: Clause 305 Part 3 approved sources, fly ash and compaction baseline

QUACRAFT — Quality in Construction
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