CATEGORY 900 MATERIALS SECTION 921 — MISCELLANEOUS
921.01 Water for Concrete Mixes
D512. Determine the chloride concentration of water used in mixing and curing of Portland cement concrete as specified. Chloride content shall not exceed the following limits:
a.Bridge Superstructure and Prestressed Concrete 500 ppm
b.Latex Modified Concrete 50 ppm
c.Other Concrete and Water Used in Curing 1000 ppm
921.02 Moisture and Dust Control Agents
921.02.01 Calcium Chloride. M 144, Type S, Grade I, Class A for solid calcium chloride.
Calcium chloride in solution shall contain a minimum of 30 percent salts. Prepare the solution using potable water as directed. The residue shall meet M 144 when analyzed according to E449.
921.02.02 Magnesium Chloride. Magnesium chloride shall be supplied in flakes and meet the
following: TEST PROPERTY SPECIFICATION LIMITS Magnesium Chloride MgCl 2, % 46.0 – 47.0 Calcium Chloride CaCl 2, % 2.0 – 3.0 Potassium Chloride KCl, % 0.5 – 1.0 Sodium Chloride NaCl, % 0.5 – 1.0 Sulfates, % max 0.05 Magnesium chloride shall contain 30 percent to 32 percent solids when used as a solution.
921.03 Lime
921.03.01 Hydrated lime shall meet the chemical requirements of C 206, Type N when used in
finishing; or C 207, Type N when used for masonry. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
921.03.02 Hydrated lime for soil stabilization shall have a minimum combined calcium oxide and
magnesium oxide content of 65 percent when tested according to C 25 and meet the following gradation: SIEVE SIZE PERCENT RETAINED max 3/8 in. 0 No. 30 3 No. 200 25
921.03.03 Quicklime shall have a combined calcium oxide and magnesium oxide content of
75 percent minimum and a gradation of 100 percent passing the 3/8 in. sieve when tested according to C 25.
921.04 Epoxy Adhesives
Epoxy resin bonding material shall consist of a thermosetting epoxy resin and a hardener. The individual components of mixed epoxy shall not settle or skin and contain no volatile solvents, lumps, or foreign materials. The epoxy shall meet C881. Epoxy adhesive used for bearing and expansion pads shall be non-sagging unless specified otherwise. The manufacturer shall furnish certification as specified in TC-1.03. The certification or data sheet shall accompany each sample and show actual test results for each required property of the type, grade, and class of epoxy submitted. The manufacturer shall also supply actual bond test results for each batch submitted for use. When used as an Epoxy Bonding Compound, use Type II for non-load bearing and Type V for load bearing.
921.05 Structural Timber and Lumber
M 168. The manufacturer shall furnish certification as specified in TC-1.03.
921.06 Timber Preservatives
All preserved wood used for highway construction and maintenance applications shall be treated according to M 133, and the American Wood Protection Association (AWPA) and ICC-ES standards for preservative, retention, and penetration with United States Environmental Protection Agency (EPA) pesticide registrations. Timber preservatives shall meet the following:
a.Water borne preservatives shall be used where a clean surface is desired, or when the wood is to be painted. Moisture content of wood shall not be greater than 19 percent at the time of treatment. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
b.All treated wood shall be free of excess preservative on the surface. Creosote-treated wood shall be double vacuum treated according to EPA requirements for use in aquatic and marine environments.
c.Wood used for sign posts, fence posts, wood posts, guardrail posts, bridge decking, gates, stair treads, and offset blocks shall be treated according to M 133 and AWPA standards with EPA pesticide registrations.
d.Wood used for piles, timbers, and composites shall be treated according to M 133 and AWPA standards with EPA pesticide registrations.
e.Wood used for hand-contact surfaces such as handrails, playground equipment and picnic tables shall be treated according to M 133 and AWPA standards with EPA pesticide registrations for residential applications. Fasteners for preservative treated wood shall be hot-dipped galvanized steel conforming to A153 or A653, Class G185. Type 304 or 316 stainless steel fasteners are also permitted.
f.Pressure treatment shall conform to the requirements of the AWPA “Use Category” as follows: Wood End Use Category AWPA Standard Bridge structures including decking, guard rail posts and offset blocks UC4B - Ground Contact Heavy Duty U1: Commodity Specification A (sawn solid products) Foundation piles UC4C - Ground Contact Extreme Duty U1; Commodity Specification E (round timber piles) Wood Composites UC4A - Ground Contact, General Use U1; Commodity Specification F (wood composites) Sign posts, fence posts and gates UC4A - Ground Contact, General Use U1: Commodity Specifications A (sawn solid products) and B (round posts) Piling, bracing and bulk heading UC4B - Ground Contact Heavy Duty U1; Commodity Specifications A (sawn solid products), B (round products) and E (round timber piles) Piling, bracing, bulkheads and fender systems UC5B Marine (Salt water) Immersion U1: Commodity Specifications G (sawn products, round timber piles and plywood)
921.07 Conduits
921.07.01 Metallic Conduit.
flow. Manholes for sanitary sewers shall have a factory molded invert for channeled flow. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS MATERIAL SPECIFICATION Electrical Metallic Tubing UL 797 Intermediate Metal Conduit UL 1242 Rigid Metal Conduit UL 6 Rigid Steel Conduit, Zinc Coated ANSI C80.1 Metallic Outlet Boxes UL 514A Fittings for Conduit and Outlet Boxes UL 514B
921.07.02 Nonmetallic Conduit. The manufacturer shall furnish certification as specified in
NEMA designation. MATERIAL SPECIFICATION Schedule 40 and 80 Rigid Polyvinyl Chloride (PVC) Conduit UL 651 Electrical Plastic Tubing (EPT) and Electrical Plastic Conduit (EPC-40 and EPC-80) NEMA TC 2 Nonmetallic Outlet Boxes, Flush Device Boxes and Covers UL 514C Electrical Nonmetallic Conduit (ENC) NEMA TC 13 PVC Fittings for use with Rigid PVC Conduit and Tubing NEMA TC 3 Flexible PVC Coated Conduit UL 360 Liquid Tight Flexible Nonmetallic Conduit for Detector Sleeves UL 1660 TC-1.03. Each length shall be stamped or embossed with the grade or type and applicable UL or
921.07.03 PVC Coated Metallic Conduit. NEMA RN 1. PVC externally coated, galvanized,
rigid steel conduit and electrical metallic tubing.
921.08 Straw Bales
When used for approved erosion and sediment control applications, straw bales shall be approximately 14 in. x 18 in. x 36 in. and as specified.
921.09 Polyethylene (Pe) Manholes
D1248, Type III, Class C, Category 3, Grade P34. Submit working drawings prior to fabrication. Compressive strength shall be determined according to D2412, modified pipe stiffness test. Pipe stiffness shall be a minimum of 12 psi at 5 percent deflection, including joints. Axial compressive strength shall be a minimum of 10 000 lb at less than 3 percent deflection. PE manholes for storm drains shall be manufactured with an invert bowl that will not interrupt The manufacturer shall furnish certification as specified in TC-1.03. Certification shall accompany each shipment of PE manholes and show actual test results, the quantity of manhole sections, and date of manufacture. Manholes shall be marked with the manufacturer’s name and trademark.
921.10 Preformed Fiberglass
Meet the following. TEST PROPERTY TEST METHOD SPECIFICATION LIMITS Density, g/cm, min D792 1.25 Absorption, % max D570 1.0 Tensile Strength, average of five specimens each direction*, psi min D638 10 000 Thickness (unless otherwise specified), in. — 3/16 Thickness Tolerance, in. — (+)1/16, -0 Color No. AMS-STD-595A 26622
921.11 Detectable Marking Tape
A direct-burial-rated subgrade detectable marking tape between 2 in. and 12 in. in width, having a 5.0 mil overall nominal thickness. The tape shall be composed of 0.8 mil clear virgin polypropylene film, reverse printed and laminated to a 0.35 mil or 35 gauge solid aluminum foil core, and then laminated to a 3.75 mil clear virgin polyethylene film with polyethylene. Tapes using reprocessed plastics or resins are not acceptable.
921.11.01 Strength. Not less than 150 lb of tensile break strength per 6 in. width. 921.11.02 Resistance. Resistant to ink rub-off, corrosion, acids, alkalis, chemicals, oils, and other
elements that may be present below grade.
921.11.03 Printing, Color, and Reflectivity. Diagonally striped design with bold, black lettering
and meeting American Public Works Association (APWA) Uniform Color-Code standard for identification of buried utilities. Color codes as follows.
a.Blue for potable water lines.
b.Green for sanitary sewer and drain lines. (c) Yellow for gas, oil, steam, petroleum, and gaseous material lines. (d) Red for electric power lines, cables, conduit, and lighting cables. (e) Orange for communication, alarm or signal lines, cables, conduits, fiber optic, and telephone lines. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
f.Purple for storm drain pipe culverts. A continuous message shall be permanently reverse printed 1.5 in. tall bold black letters; repeated every 20 in. to 36 in. and cannot be scratched off. The tape shall be inscribed with the proper message for the applicable utility over which it is installed with warnings such as “CAUTION……LINE BURIED BELOW” and shall contain a diagram and burying instructions. The imprint shall allow total reflectivity. Tape must be clearly and easily detectable before it can be read.
921.11.04 Detectability. Capable of being detected below grade by either conductive or inductive
location techniques and locatable by standard methods typical of utility quality level B investigations. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 922 — PREFABRICATED EDGE DRAINS CATEGORY 900 MATERIALS SECTION 922 — PREFABRICATED EDGE DRAINS
922.01 Certification
The manufacturer shall furnish certification as specified in TC-1.03.
922.02 Prefabricated Edge Drains
Shall be flexible, rectangular conduit consisting of supporting drainage core encased in a geotextile. Drainage Core. Material shall be manufactured from polymers having a high resistance to deterioration by pavement deicing salts, petroleum-based materials, and naturally occurring soil chemicals. The core shall have sufficient flexibility to withstand bending and handling without damage or significant weakening. The core geotextile contact point spacing for post and cuspated sheet type cores shall not exceed 1.125 in. Elongated pipe core sections shall have a 7.5 in./ft minimum open area to allow lateral flow into the core. Cores with support on only one side shall have a minimum of 5 percent of the area of that support side in unobstructed flow. Drainage core shall meet the following requirements: TEST PROPERTY TEST METHOD SPECIFICATION LIMITS Thickness, in. min — 0.75 Compressive Strength, psi, @ 20% maximum deformation, min (a) 40 In-plane Flow Rate, gal/min/ft of width, min D4716 (b) 15
a.D5034 for crushed sheet and post type cores. D2412 for elongated pipe type cores. (b) 10 psi load after 100 hr at a hydraulic gradient of 0.1 Geotextile Wrap. Section 919, Class SD, Type II. The fabric shall be bonded to contact points of supporting core for post and cuspated sheet type cores to ensure that the geotextile does not sag into the core flow area. The geotextile shall be tightly stretched over the core for elongated pipe type cores. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 1048–1053 of 1,113.