610RIPRAP

488

water level. The back of the trench shall be on the same slope as the fill. The laying of the courses shall progress upward, the larger stones being placed in the lower courses. The individual pieces of stone in each horizontal course shall be laid so that they will break joints with the stones in the course below the tops sloped to drain away from embankment. Open joints shall be filled with spalls, or small stones in such manner that all stones are tightly wedged or keyed. The finished surface shall present a reasonably uniform appearance and shall not vary more than 6 inches {150 mm} from the average surface. The finished surface at the ends of the riprap shall be flush with the adjacent earth fill surface.

Class 2 and 3 riprap is designed for use in areas with minimal to medium water currents and wave action. The stones shall be placed in such a manner as to produce a reasonably well graded mass of rock with the minimum practical percentage of voids. The riprap shall be constructed to the lines, grades and thickness shown by the plans or directed within a tolerance of plus 15 inches {375 mm} or minus 3 inches {75 mm} from the designated finish surface of the riprap, except that either extreme of such tolerance shall be reached as a uniform rate over an area greater than 200 square feet {19 m²}. Riprap shall be placed in its full course thickness in one operation and in such a manner as to avoid displacing the filter blanket material, where filter blanket is required. The larger stones shall be well distributed and the entire mass of stones in their final position shall conform to a reasonable uniform gradation. The finished riprap shall be free from objectionable pockets of small stones and clusters of larger stones. Placing riprap by dumping into chutes or by other methods likely to cause segregation of sizes will not be permitted. The desired distribution of the various sizes of stones throughout the mass shall be obtained by selective loading of the material at the source, by controlled dumping of successive loads during final placing, or by other methods of placement which will produce the specified results. Rearranging of individual stones by mechanical equipment, or by hand, will be required to the extent necessary to obtain a reasonably well graded distribution of stone as specified above.

Class 4 and 5 riprap is designed for use in medium to high water currents and wave actions for the protection of bridge piers and abutments, and protection of channel slopes. Stones may be placed without strict gradation controls provided sufficient small sizes are included to choke the larger stones. Dumping of the stones will be allowed; however, mechanical equipment to dress the material to a reasonable uniform slope will be required. Stones deposited contrary to directions will be considered wasted and will not be paid for.

Immediately following mixing, as noted in Article 814.02, the mixture shall be placed in the bags, tied (so that when laid in position they will flatten out and give a thickness of not less than 6 inches {150 mm} and placed flat on the area designated. Bags shall be rammed against each other to form closed joints, with tied ends of sacks all laid in the same direction. When required to be placed under water, special care shall be taken to see that bags are closely jointed to give the same tight joints as required on dry slopes. After the riprap is placed, it shall be sprinkled with water as directed and kept damp for not less than three days. No Concrete Sacked Riprap shall be mixed in freezing weather.

Tied concrete block mat shall be placed according to the manufacturer’s recommendations.

The Contractor shall maintain all riprap until the contract is accepted, and shall replace, without additional compensation, any damaged or lost riprap.

610.04Method of Measurement

Loose Riprap of the class designated by the plans or proposal will be measured in square yards {square meters}, computed from measurements taken parallel to the surface of the riprap or in tons {metric tons} as specified in Subarticle 109.0l(h), whichever is specified by the plans or proposal. Concrete Sacked Riprap, Filter Blanket, and Tied Concrete Block Mat will be measured in square yards {square meters} computed from measurements taken parallel to the outer surface of the riprap or the filter blanket, whichever is applicable. MORTAR FOR MASONRY 489

610.05Basis of Payment

The contract unit price for Loose Riprap, Concrete Sacked Riprap, Filter Blanket, and Tied Concrete Block Mat shall be full compensation for furnishing and hauling all materials, preparation of the placement area, placing materials and for all equipment, tools, labor and incidentals necessary to complete these items of work. The preparation of the area for the placement of riprap and tied concrete block mat includes excavation, dressing the placement area and surrounding area, and the disposal of any excess excavated material. Payment for this preparation shall be included in the contract unit price for the riprap unless otherwise noted on the plans.

610-A Loose Riprap, Class ____ , ____ inches {mm} Thick - per square yard {square meter} 610-B Concrete Sacked Riprap - per square yard {square meter} 610-C Loose Riprap, Class ____ - per ton {metric ton} 610-D Filter Blanket, * - per square yard {square meter} 610-E Tied Concrete Block Mat – per square yard {square meter} * If a specific type of blanket is required, so designate (aggregate or geotextile). MORTAR FOR MASONRY

611.01Description

This Section shall cover the work of furnishing mortar made in accordance with these specifications, for the various classes and kinds of masonry when its use is required.

611.02Materials

Materials shall conform to the provisions of Division 800, Materials. Specific reference is made to the following:  Masonry Cement Article 815.06  Sand Article 802.03  Water Article 807.01  Hydrated Lime Section 805

611.03Construction Requirements

The mortar shall be composed of one part of cement and two parts of sand by volume, on basis of dry sand, and sufficient water to make a mortar of such consistency that it can be easily handled and spread with a trowel. If directed, hydrated lime, not to exceed 15 percent of cement by weight {mass}, shall be added, except that if masonry cement is used hydrated lime will not be required. Mortar shall be mixed only in quantities required for immediate use. Unless an approved mortar mixing machine is used, the sand and cement shall be mixed dry in a watertight box until the mixture assumes a uniform color, after which water shall be added as the mixing continues until the mortar attains the proper consistency. Mortar which is not used within 45 minutes after water has been added shall be wasted. Retempering of mortar will not be permitted.

611.04Method of Measurement

No measurement will be made for mortar for masonry.

611.05Basis of Payment

Payment for mortar for masonry shall be included in unit prices of pay items for various kinds of masonry, and no direct payment will be made for mortar.