SECTION 910 – MASONRY UNITS
910.01 Clay Or Shale Brick
Use clay or shale brick conforming to AASHTO M 114, Grade MW, with the dimensions as specified in Table 910.01-1. Table 910.01-1 Dimensions of Clay or Shale Brick Length 7 3/4 – 8 1/4 inches Width 3 1/2 – 3 7/8 inches Depth 2 1/8 – 2 3/8 inches Submit a certification of compliance as specified in 106.07.
910.02 Concrete Block for Inlets and Manholes
In the manufacture of concrete block, use cement as specified in 903.01 and aggregates conforming to the requirements for concrete aggregates as specified in 901.06. Manufacture concrete block according to ASTM C 139. The manufacturer shall sample and test concrete block according to ASTM C 140. Manufacture blocks to be either rectangular in shape or curved with the inside and outside surfaces curved to the required radii, whichever is appropriate for the shape of the structure. Ensure that the length is between 12 and 18 inches, the height is between 5 and 8 inches, and the width is at least 6 inches. For the reduction of cross sectional area of the cones or tops of manholes, the Contractor may use blocks of special shapes and heights. The Contractor may also use blocks of special shapes and heights in the top courses of all structures so that the head castings is set at the required elevation on a mortar bed not more than 1/2 inch thick without cutting the blocks. Ensure that all blocks have an interlocking-type joint at the ends and are sound and free from cracks or other defects. Submit a certification of compliance as specified in 106.07.
910.03 Concrete Brick
In the manufacture of concrete brick, use cement as specified in 903.01 and aggregates conforming to the requirements for concrete aggregates as specified in 901.06. Manufacture concrete brick to conform to ASTM C 139 and to the dimensions specified in Table 910.01-1. The manufacturer shall sample and test concrete brick according to ASTM C 140. Submit a certification of compliance as specified in 106.07.
910.04 Stone Curb
Use stone curbs that are of a lithology, color, and texture as specified in the Special Provisions. Fabricate stone curb from a commercially available material with an established history of satisfactory durability and resistance to weathering. Use curb stones from a single quarry with the same color and texture . The Department may allow reasonable variations in color and texture if the variations do not affect the architectural qualities or the structural properties of the stone.
1.Quarry-Split Stone. Ensure that the top face of quarry-split stone for curbs is machine-finished or dressed to an even surface, without depressions or projections of more than 3/8 inch below or above the plane of the face. Ensure that the edges are straight and even, and the ends are cut square for the entire depth of the exposed curb face. Dress curb stones so that joints are not more than 3/8 inch wide from top to gutter line and not more than 1 inch wide below the gutter line.
2.Dressed Stone. Ensure that dressed stone for curbs is dressed to an even, smooth finish on the top face, on the front face for the entire depth of the exposed curb face, on the back face to a depth of 2 inches, and on the ends to a depth of 1 inch. Ensure that projections and depressions on the various faces do not exceed the allowances in Table 910.04-1. Extend the rough-dressed part of end faces to 1 inch below the gutter line. Ensure that the back edge of the top is parallel to the front face, the top and front faces are sloped, and the front edge is rounded. Fabricate the stones to have the width specified at the top, and to have a bottom width of not less than 1 and not more than 3 inches different from the top width. Provide stones in lengths of between 4 and 8 feet. Table 910.04-1 Maximum Allowable Deviations for Dressed Stone Depression (inches) Projection (inches) Top 1/4 1/4 Front, dressed part 1/4 1/4 Front, undressed part 1 1/2 1/2 Back, dressed part 1/2 1/2 Back, undressed part 1 1/2 1 1/2 Ends, dressed part 1/4 1/4 Ends, rough-dressed part 1/2 1/4 Ends, undressed part 1 1/2 1/4 The Contractor may use straight-cut stone for curved curb having a radius of more than 50 feet, but shall dress the curb to true radius after it is set in place. For curved curb having radii smaller than 50 feet, cut the stone to the required radius, and cut the ends so that the joints are less than 1/4 inch wide for the full depth. Submit a certification of compliance as specified in 106.07.
910.05 Stone Facing for Pier Shafts
Use stone facing for pier shafts that is of a lithology, color, and texture as specified in the Special Provisions. Ensure that the stone is sound, durable, and free from flaws, discoloration, and structural defects. Granite and stone of similar lithologies normally exhibit a relatively uniform color and texture. The Department may allow a reasonable variation in color and texture and an occasional irregular distribution of the component minerals of the granite, termed waves, or knots, if the variations do not impair the architectural qualities or affect the structural properties of the stone. Quarry the stone from quarries that have ample production capacity both as to quantity and quality. Submit 1 × 1 foot duplicate samples to the Department to indicate the range of color, texture, and surface finish of the stone to be provided. After approval of the samples, the Department will return 1 set of samples for guidance. Ensure that all stone used in the Project matches the samples. Ensure that the stone provided is capable of withstanding a crushing stress of 20,000 pounds per square inch on 2 1/2 inch diameter cores tested air-dry. Submit a certification of compliance as specified in 106.07. Include with the certification a performance history indicating that the stone proposed for use has satisfactorily withstood prolonged exposure in environments similar to that of the Project.
910.06 Stone Paving Block
For stone paving block, use new or used stone block of good quality. Ensure that the color, texture, and uniformity conform to the requirements specified in the Special Provisions. Ensure that reclaimed blocks are free of bituminous and cement grout coatings and other foreign matter. Submit a certification of compliance as specified in 106.07.
Referenced in this section
Sections that cite this one
Masonry Units in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 513–514 of 651. View official source ↗