SECTION_31_37_00_Riprap_or_rock_lining.docx
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SECTION 31 37 00 RIPRAP
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SECTION 31 37 00
SECTION 31 37 00
RIPRAP
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Placement of loose riprap, hand-placed riprap, or grouted riprap. |
| 1.2 | REFERENCES |
| A. | ASTM C 535: Standard Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine. |
| 1.3 | SUBMITTALS |
| A. | Submit prior to use in the Work product data showing riprap source, gradation, aggregate wear and placement technique. |
| PART 2 | PRODUCTS |
| 2.1 | AGGREGATE |
| A. | Durable, angular, hard stone free from seams and cracks. |
| B. | Graded in size to produce a reasonably dense mass. |
| C. | The greatest dimension of 25 percent of the stones shall be at least, equal to but not more than 1-1/2 times the thickness of riprap indicated. |
| D. | The greatest dimension of 50 percent of the stone shall be at least 3/4, but not more than 1-1/2 times the thickness of riprap indicated. |
| E. | Not more than 10 percent of the aggregate shall have a dimension less than 0.1 times the thickness of riprap. |
| F. | At least 95 percent of the stones shall have a minimum of 2 fractured or clean angular faces. |
| 2.2 | ACCESSORIES |
| A. | Portland cement grout, Section 03 61 00. |
| B. | Geotextile fabric, Section 31 05 19. |
| 2.3 | SOURCE QUALITY CONTROL |
| A. | Aggregate: Wear not greater than 40 percent when tested, ASTM C 535. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Remove all brush, trees, stumps, and other objectionable materials and dress area to a smooth surface. Make Excavation to provide a firm foundation and protect against undercutting. Secure approval prior to backfilling. |
| B. | Install required geotextile in accordance with Section 31 05 19. |
| 3.2 | LOOSE-PLACED RIPRAP |
| A. | Place stones to secure a Rock mass with the minimum thickness and height indicated. Manipulate Rock to secure a regular surface of graded size and mass stability. |
| 3.3 | HAND-PLACED RIPRAP |
| A. | Place and bed the Rocks, one against the other, and key together. Fill irregularities between stones with suitable size spalls. |
| B. | Place so that finished surface of riprap is even, tight, and true to line and grade. Extend riprap sufficiently below ground surface to secure a firm foundation. |
| 3.4 | GROUTED RIPRAP |
| A. | Place riprap as indicated. |
| B. | After wetting the stones, sweep sand or fine gravel into the interstices to fill to within 4 inches of the outer surface of the riprap. |
| C. | Fill the remaining volume of the interstices flush with a well-mixed grout. |
| D. | Keep grout wet by sprinkling or covering with wet material for at least 3 days. Protect grout from disturbance during this cure period. |
| E. | Do not place grout in freezing weather. |
END OF SECTION
RIPRAP Page 1
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