Standard Interpretations - Table of Contents|
| Standard Number:||1926.752; 1926.752(a)(1)|
|OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov.|
Before authorizing the commencement of steel erection, the controlling contractor shall ensure that the steel erector is provided with the following written notification: the concrete in the footings, piers and walls and the mortar in masonry piers and walls has attained, on the basis of an appropriate ASTM standard test method of field-cured samples, either 75 percent of the intended minimum compressive design strength or sufficient strength to support the loads imposed during steel erection.As you are aware, the standard does not specify the number of test cylinders that must be taken to assess concrete strength. However, since the standard does require the concrete to attain a specified strength, the number of samples taken must be sufficient for the tester to make a reasonably accurate assessment. In determining the number of samples, the tester will have to consider conditions and factors typically used by professionals in making these judgments. These include the volume of concrete being used, number of batches, whether different classes of concrete are used, and amount of surface area (for slabs and walls).
|Standard Interpretations - Table of Contents|