814RIPRAP MATERIALS

685

RIPRAP MATERIALS

814.01Stone

All stone for riprap shall consist of field stone or rough unhewn quarry stone as nearly rectangular in section as is practicable. When tested as specified in AASHTO T 104, the stone shall show a soundness of not less than 85 percent for 5 cycles, using sodium sulphate, and shall be suitable in all other respects for the purpose intended. It shall have a percentage wear not over 60 percent by the Los Angeles Test, AASHTO T 96, and shall meet the requirements of Article 801.02 for deleterious substances; however, the requirements for deleterious substances may be modified by the Engineer. Control of the gradation of the various classes of riprap will be by visual inspection either at the source or the project site at the Engineer's option. Any difference of opinion between the Engineer and the Contractor shall be resolved by checking two random truck loads (or equivalent size sample) in accordance with the method provided in ALDOT-239 with all the equipment, labor, and sorting site for this check being provided by the Contractor at his expense.

Stone for this class riprap shall consist of graded stones ranging from 10 to 100 pounds {5 to 50 kg} with not more than 10% having a weight {mass} over 100 pounds {50 kg} and at least 50% having a weight {mass} over 50 pounds {25 kg} and not over 10% having a weight {mass} under 10 pounds {5 kg}.

Stone for this class riprap shall consist of graded stones ranging from 10 to 200 pounds {5 kg to 100 kg} with not over 10% having a weight {mass} over 200 pounds {100 kg} and at least 50% having a weight {mass} over 80 pounds {40 kg} and not over 10% having a weight {mass} under 10 pounds {5 kg}.

Stone for this class riprap shall consist of reasonably well graded stones ranging from 25 pounds to 500 pounds {10 kg to 250 kg} with not over 10% having a weight {mass} over 500 pounds {250 kg}, at least 50% having a weight {mass} over 200 pounds {100 kg} and not more than 15% having a weight {mass} under 25 pounds {10 kg}.

Stone for this class riprap shall consist of reasonably well graded stones ranging from 50 to 1000 pounds {25 kg to 450 kg} with not over 25% having a weight {mass} over 1000 pounds {450 kg}, at least 50% having a weight {mass} over 500 pounds {250 kg} and not more than 25% having a weight {mass} under 50 pounds {25 kg}.

Stone for this class riprap shall consist of reasonably well graded stones ranging from 2000 pounds {900 kg} and down with not over 10% having a weight {mass} over 2000 pounds {900 kg}, at least 50% having a weight {mass} over 1000 pounds {450 kg} and not more than 25% having a weight {mass} under 200 pounds {100 kg}.

814.02Concrete Sacked Riprap

Sacks shall be new, unused, manufactured from jute, cotton, burlap, reinforced paper, or other approved materials capable of holding the cement mixture without significant leakage when handled. The sacks shall be of uniform size and dimension with a capacity of approximately 0.75 cubic feet {0.025m3}.

Local sand, gravel, or other designated aggregates shall be from sources approved by the Engineer suitable for the purpose intended.

Cement shall meet the requirements of Section 815.

Water shall meet the requirements of Section 807. CEMENT 686

The aggregate and cement shall be formulated by volumetric measure in the proportions of one part cement to four parts sand and five parts gravel or nine parts of bank run gravel, or to designated proportions of other materials, then damp mixed in a concrete mixer using sufficient water to provide for a crumbly consistency.

Prepackaged sack riprap which utilizes approved bagging material and a dry mixture of predried sand-cement material may be substituted for the concrete sacked riprap noted in this Article provided

the packing material is permeable and absorptive enough to permit passage of sufficient water to provide for hydration of the cement, (3) the sand and cement materials are from sources acceptable to the Materials and Tests Engineer, (4) the sand and cement are dry mixed in the proportions of 5 cubic feet {0.14 m³} of sand to one bag of cement until uniform in color, (6) packaging, handling, and storage shall be such as to prevent damage to the prepackaged material, especially from collecting excess moisture until placed.

814.03Filter Blanket

Filter blanket material shall consist of a blanket of aggregate or geotextile blanket placed under a riprap material.

An aggregate blanket may be either gravel or crushed stone ALDOT Size No. 467 aggregate, unless otherwise shown on the plans, reasonably free from flat or elongated pieces and from organic or soft friable particles in objectionable quantities.

The geotextile shall meet the requirements of AASHTO M 288 for Permanent Erosion Control Geotextile and Section 810 of these specifications. CEMENT

815.01Portland Cement

Type I Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type II Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type III Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type IS Portland blast furnace slag cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement.

Type IL Portland limestone cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement.

Type IP Portland pozzolan cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement.