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IRC 58:2015
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Clauses
IRC 58:2015 — Clause Reference
6 detailed clauses with interactive calculators, reference tables, and practical notes.
Cl. 4
Design Basis — Flexural Strength & Fatigue, Not Compressive Strength
A concrete pavement slab fails in bending fatigue under repeated wheel loads, so IRC 58 designs on the concrete's flexur…
Cl. 5
Traffic — Axle-Load Spectrum & Cumulative Repetitions
IRC 58 designs against the realistic axle-load spectrum — the distribution of single, tandem and tridem axle loads from …
Cl. 6
Cumulative Fatigue Damage (Miner's Rule) & Temperature Stress
IRC 58 checks cumulative fatigue damage: for each axle-load category the applied (wheel-load + temperature curling) flex…
Cl. 7
Slab Thickness Design & Foundation (k-value)
Slab thickness in IRC 58 is found iteratively: a trial thickness is checked so the cumulative fatigue damage (bottom-up …
Cl. 8
Joints — Contraction, Expansion, Dowel & Tie Bars
Plain jointed rigid pavements are designed to crack at controlled locations: contraction joints (spaced to limit shrinka…
1 table
Cl. 9
Subgrade, Sub-base & Drainage
The slab is only as good as what it sits on. IRC 58 requires a prepared, compacted subgrade meeting a CBR/k target, a su…
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