674STONE SLOPE WALLS

674.1DESCRIPTION—This work is construction of plain or mortared stone slope walls.

674.2MATERIAL—

substances. Submit samples to the LTS for petrographic examination before use, unless the rock comes from material providing an approved Type A aggregate. Use stones at least 3 inches thick, of a length at least three times the thickness, and of a width at least equal to the depth of the slope wall from the exposed surface of the slope wall to the subgrade, except for spalls for packing voids. For stones in excess of 6 inches thick, use stones at least twice as long as their thickness.

• Class A Cement Concrete. Section 704

• Premolded Expansion Joint Filler. Section 705.1

• Mortar. Section 705.7(b), except use Type C, fine aggregate.

• Filler. Acceptable coarse sand, gravel, or other material.

• Geotextiles, Class 4, Type A. Section 735

674.3CONSTRUCTION—As shown on the Standard Drawings and as follows:

placing geotextiles, set stones by hand and firmly bed on the prepared graded area, with the length dimension approximately parallel to the toe wall foundation. Bed stones one against the other with ends and sides in contact, then break joints. Lay the stones flat in toe wall and cutoff wall areas. Set the stones on edge in anchor wall areas and on sloped areas. Pack spaces between the larger stones with spalls, then ram into place. Tamp the whole area of the wall to a tight, even surface. Fill voids by sweeping filler over the surface.

mortar and spalls, as required, to within 1/2 inch of the surface of the adjacent stone. Use mortar with a stiff but workable consistency. Pointing is not required. Do not hammer, roll, o r ram the stones after mortaring. If the bond around stones becomes broken, remove stones and mortar, reset the stones, and fill the voids with mortar, as specified. Do not place mortar in freezing weather, unless allowed in writing, and then only with adequate protection. Remove and replace work damaged by frost. Protect completed wall from the elements and cure with water for a period of at least 3 days.

indicated and as specified in the applicable parts of Section 1001.3. Obtain approval.

674.4MEASUREMENT AND PAYMENT—

675 – 1