1808.8.1 Concrete or Grout Strength and Mix Proportioning
Where concrete is placed through a funnel hopper at the top of a deep foundation element, the concrete mix shall be designed and proportioned so as to produce a cohesive workable mix having a slump of not less than 4 inches (102 mm) and not more than 8 inches (204 mm). Where concrete or grout is to be pumped, the mix design including slump shall be adjusted to produce a pumpable mixture.
|FOUNDATION ELEMENT OR CONDITION||SPECIFIED COMPRESSIVE STRENGTH, f 'c|
|1. Foundations for structures assigned to Seismic Design Category A, B or C||2,500 psi|
|2a. Foundations for Group R or U occupancies of light-frame construction, two stories or less in |
height, assigned to Seismic Design Category D, E or F
|2b. Foundations for other structures assigned to Seismic Design Category D, E or F||3,000 psi|
|3. Precast nonprestressed driven piles||4,000 psi|
|4. Socketed drilled shafts||4,000 psi|
|5. Micropiles||4,000 psi|
|6. Precast prestressed driven piles||5,000 psi|
For SI: 1 pound per square inch = 0.00689 MPa.