7-26 SECTION 705 – MASONRY UNITS
705.01 BRICK . Brick masonry units shall meet the following requirements:
a.Manhole Brick . Manhole brick shall be in accordance with ASTM C32, Grade MS.
b.Sewer Brick . Sewer brick shall be in accordance with ASTM C32, Grade SM.
c.Pedestrian Paving Brick . Pedestrian paving brick shall be in accordance with ASTM C902 , Class SX, Type I.
d.Vehicular Paving Brick . Vehicular paving b rick shall be classified as Application PS in accordance with ASTM C1272 , unless otherwise specified.
1.Mortar Bedded . Vehicu lar paving brick to be set in mortar, with a concrete or bituminous base, shall be in accordance with ASTM C1272 , Type R.
2.Aggregate Bedded . Vehicular paving brick to be set in aggregate shall be in accordance with ASTM C1272 , Type F.
705.02 CONCRETE MASONRY BLOCKS . Concrete masonry blocks shall be in accordance with ASTM
C139 .
705.03 PRECAST DROP INLETS, CATCH BASINS, AND MANHOLES . Precast drop inlets, catch
basins, and manholes shall be in accordance with AASHTO M 199 . 7-27 SECTIO N 706 – STON E FOR MASONRY , RIPRAP , AND OTHE R PURPOSES 706.0 1 STON E FOR MASONRY . Stone for masonry shall be quarry stone, field stone, or rock fragments approximately rectangular in shape and of a hard, sound, and durable quality acceptable to the Engineer. The stone shall be free from structural defects or imperfections that would tend to compromise its resistance to the weather. At least 80% of the individual stones in a unit shall have a thickness of not less than 8 inches and a width of not less than 150% of the thickness. The minimum size of the other stones in the unit shall have a thickness of not less than 4 inc hes and a width of not less than 150% of the thickness. 706.0 2 STON E FOR MASONR Y FACING . Stone for masonry facing shall be irregularly shaped or roughly rectangular quarried granite, marble, or another quarried stone approved by the Engineer . Stone for capping shall conform to the dimensions shown on the Plans unless changes are ordered in writing by the Engineer. The stone shall be of approved quality, tough, sound, and durable, resistant to weathering action, unifor m in color, free from seams, cracks, laminations, pyrite inclusions, and minerals or other structural defects which, by weathering, would cause discoloration or deterioration , and shall be thoroughly cleaned of any iron or rust particles. Stone shall be of such character that it can be wrought to such lines and surfaces, whether curved or plane, as required. Any stone having defects that have been repaired with cement or other materials will be rejected. The stone shall be kept free from dirt, oil, and any other detrimental material that may prevent the proper adhesion of the mortar or detract from the appearance of the exposed surfaces. The front face of the facial stone, including capstones when required, shall be smooth, quarry -split, free from drill hole s in the exposed face, with no projections or depressions greater than 1 inch measured from the vertical plane of the face of the stone. The capstone shall have a top surface sawed to an approximately true plane. The front and back arris lines of the capst ones shall be pitched straight and true. 706.0 3 STON E FOR RIPRAP . Stone for riprap shall be approved, rough, unhewn quarry stone, as nearly rectangular in section as practical. The stones shall be hard, sound, and resistant to the action of water and weat hering. They shall be of a rock type other than serpentine rock containing the fibrous variety chrysotile (asbestos) and suitable in every respect for the purpose intended.
a.Riprap, Heavy Type . The individual stones shall have a depth equal to the thickness of the course of riprap. At least 75% of the volume of the riprap shall consist of stones that have a minimum volume of 16 cubic feet.
b.Riprap, Light Type . The individual stones shall have a depth equal to the thickness of the course of riprap and sha ll have a minimum volume of 1/2 cubic foot.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 1178–1178 of 1,380.