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// CODE SNIPPET

1808.8.2 Concrete Cover

Building Code 2018 of Illinois > 18 Soils and Foundations > 1808 Foundations > 1808.8 Concrete Foundations > 1808.8.2 Concrete Cover
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ILLUSTRATION
The concrete cover provided for prestressed and nonprestressed reinforcement in foundations shall be not less than the largest applicable value specified in Table 1808.8.2. Longitudinal bars spaced less than 11/2 inches (38 mm) clear distance apart shall be considered to be bundled bars for which the concrete cover provided shall be not less than that required by Section 20.6.1.3.4 of ACI 318. Concrete cover shall be measured from the concrete surface to the outermost surface of the steel to which the cover requirement applies. Where concrete is placed in a temporary or permanent casing or a mandrel, the inside face of the casing or mandrel shall be considered to be the concrete surface.
TABLE 1808.8.2
MINIMUM CONCRETE COVER
FOUNDATION ELEMENT OR CONDITION MINIMUM COVER
1. Shallow foundations In accordance with Section 20.6 of ACI 318
2. Precast nonprestressed deep foundation elements  
Exposed to seawater  3 inches
Not manufactured under plant conditions
2 inches
Manufactured under plant control conditions In accordance with Section 20.6.1.3.3 of ACI 318
3. Precast prestressed deep foundation elements  
Exposed to seawater 2.5 inches
Other In accordance with Section 20.6.1.3.3 of ACI 318
4. Cast-in-place deep foundation elements not enclosed by a steel pipe, tube or permanent casing 2.5 inches
5. Cast-in-place deep foundation elements enclosed by a steel pipe, tube or permanent casing 1 inch
6. Structural steel core within a steel pipe, tube or permanent casing 2 inches
7. Cast-in-place drilled shafts enclosed by a stable rock socket 1.5 inches
For SI: 1 inch = 25.4 mm.

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