Attachment_2_-_Material_Specifications.pdf

NRCS-OKLA 263E-1 June 2010

MATERIAL SPECIFICATION

263E. ROCK FOR RIPRAP

1. SCOPE

This specification covers the quality and gradation of rock and aggregate to be used on this project.

2. QUALITY

Individual rock fragments shall be dense, sound and free from cracks, seams and other defects conducive to accelerated weathering. The rock fragments shall be angular to subrounded in shape. The least dimension of an individual rock fragment shall be not less than one-third the greatest dimension of the fragment.(Less than 5% of the individual rocks larger than five pounds shall be flat or elongated to the extent that they will not meet this criteria.)

Loads that arrive on the job that appear to have a significant deviation from the specification, as determined by a cursory inspection by the Government, will be rejected and the supplier will remove the questionable material. If the material is unloaded on the site and the Government determines there is a significant deviation from the specification, the weight ticket will be noted as objectionable and can be handled one of two ways as determined by the supplier's Job Coordinator:

a. The supplier can reload the material and remove it from the job. No compensation will be made for the material.

b. The Government can note on the ticket that the material does not meet specifications, the reason it does not meet specifications in his opinion, and the weight of the questionable load will be reduced by 50%. The material will then be utilized in some form or fashion on the job.

The source of rock for riprap must be approved by the Government and material shall meet or exceed the criteria of NRCS Rock Type 3, which are detailed below:

Bulk specific gravity (saturated surface-dry basis)—Not less than 2.3 when tested in accordance with ASTM C 127 on samples prepared as described for soundness testing.

Absorption—Not more than 4 percent when tested in accordance with

ASTM C 127 on samples prepared as described for soundness testing.

Attachment 2 AG-SPEC-S-16-0023

NRCS-OKLA 263E-2 June 2010

Soundness—The weight loss in 5 cycles shall be not less than 20 percent when sodium sulfate is used or more than 25 percent when magnesium sulfate is used.

In lieu of the above criteria, rock sources which possess a current Oklahoma Department of Transportation Stone for Riprap certification may be accepted.

3. GRADATION

a. Riprap-Bedding Gradation - (Approximate)

Size % Passing 4" 100 2" 60-90

1" 40-70 #4 0-15

b. Riprap Gradation - (Approximate)

Riprap Max Max Avg Avg Not More than 20% Thickness Wt Size Wt Size Lighter Smaller (inches) (lbs) (in) (lbs) (in) Than Than

12 150 12 30-50 8-9 20 lbs. 6 in.

18 350 18 70-125 10-12 30 lbs. 8 in.

24 1000 24 225-400 15-18 40 lbs. 9 in.

30 1000 24 225-400 15-18 40 lbs. 9 in.

36 2000 30 450-800 19-23 80 lbs. 10 in.

c. Surge

Rock Material - Maximum Size - 6" <10% (by weight) smaller than 1/2"

d. Crushed Rock

1-1/2" Crusher Run

Attachment 2 AG-SPEC-S-16-0023