2017-01-18_INSPECTION - M1992069

Home Browse Search

Type H(Class 18) 70- 100 30 18 50- 70 24 35 - 50 18 2 - 10 6 Type VH(Class 24) 70- 100 42 24 50- 70 33 35 - 50 24 2- 10 9 * d50=Mean Particle Size 1. The riprap designation and total thickness of riprap shall be as shown on the Drawings. The maximum stone size shall not be larger than the thickness of the riprap. 2. The specific gravity of the riprap shall be 2.65 or greater. 3. Neither width nor thickness of a single stone of riprap shall be less than 1/3 of its length. 4. Broken concrete or asphalt pavement shall not be acceptable for use in the work. Rounded riprap (river rock) is not acceptable unless specifically designated on the Drawings. 5. The color of the riprap shall be as approved by the OWNER prior to delivery to the project site. Color shall be consistent on the entire project and shall match the color of rock to be used for all other portions of the work. Color required for this project shall be green-gray rock. 6. Minimum density for acceptable riprap shall be 165 pounds per cubic foot. The specific gravity shall be according to the bulk-saturated, surface-dry basis,AASHTO T85. 7. The riprap shall have a percentage loss of not more than 40 percent after 500 revolutions when tested in the Los Angeles machine in accordance with AASHTO Test T96. i S. The riprap shall have a percentage loss of not more than 10 percent after 5 cycles when tested in accordance with AASHTO Test T104 for ledge rock using sodium sulfate. t 9. The riprap shall have a percentage loss of not more than 10 percent after 12 cycles of freezing and thawing when tested in accordance with AASHTO Test T103 for ledge rock,procedure A. ; t 10. Rock shall be free of calcite intrusions. 11. Each load of riprap shall be reasonably well graded from the smallest to the largest size specified. Stones smaller than the 2-10 percent size will not be permitted in an amount exceeding 10 percent by weight of each load. Boyd Freeman Ditch Improvements 02375-2 Rpprap August 2005