921 MISCELLANEOUS

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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) BridgeA structure including supports erected over a depression or an obstruction, such as water, highway, or railway, and having a track or passageway for carrying traffic or other moving loads, and having an opening measured along the center of the roadway of more than 20 feet between undercopings of abutments or spring lines of arches, or extreme ends of openings for multiple boxes; it may also include multiple pipes, where the clear distance between openings is less than half of the smaller contiguous opening. For lengths, all dimensions shall be parallel to the center line of the roadway. The dimensions of handrails will not be taken into account in measuring bridge lengths. Any bridge or highway grade separation structure includes the connecting highways, substructure, superstructure, roadway approaches, entrance plazas, interchanges, overpasses, underpasses, and other structures which the Administration may deem necessary together with all property rights, easements, franchises, and interests acquired by the Administration for the construction and operation of the bridge. SuperstructureAll of that part of the structure above bottoms of bearings of simple and continuous spans, skewbacks of arches and tops of footings of rigid frames, except as noted above for substructure. 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 per MSMTMaryland Standard Method of Tests (as developed by the State Highway Administration) 601.
921.02.02 Magnesium Chloride. Magnesium chloride shall be supplied in flakes and meet the following:
TEST PROPERTY SPECIFICATION LIMITS
Magnesium Chloride MgCl2, % 46.0 – 47.0
Calcium Chloride CaCl2, % 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 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.
921.03.02 Hydrated lime for soil stabilization shall have a minimum combined calcium oxide and magnesium oxide content of 65 percent when tested per 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 per 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 per [[TC - SECTION 1: REFERENCES AND DEFINITIONS#TC-1.03 Definitions|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.
921.05 STRUCTURAL TIMBER AND LUMBER.
M 168. The manufacturer shall furnish certification as specified in TC-1.03.
921.06 TIMBER PRESERVATIVES.
All wood shall be treated per M 133 and the American Wood Protection Association (AWPAAmerican Wood Preservers Association) and ICCIntercounty Connector-ES StandardsThe official Standards for Highway and Incidental Structures, maintained on the Administration website. The latest incorporated revisions issued on or before the date of advertisement of the Contract. for preservative, retention, and penetration with US Environmental Protection Agency (EPAEnvironmental Protection Agency) pesticide registrations. Timber preservatives shall meet the following.
(a) Water borne preservatives shall be used where a clean surface is desired or the wood is to be painted. Moisture content of wood shall not be greater than 19 percent at the time of treatment.
(b) All treated wood shall be free of excess preservative on the surface.


(c) Wood used for sign posts, fence posts, wood posts, guardrail posts, bridge decking, gates, stair treads, and offset blocks shall be treated per M 133 and AWPAAmerican Wood Preservers Association StandardsThe official Standards for Highway and Incidental Structures, maintained on the Administration website. The latest incorporated revisions issued on or before the date of advertisement of the Contract. with EPAEnvironmental Protection Agency pesticide registrations.
(d) Wood used for piles, timbers, and composites shall be treated per M 133 and AWPAAmerican Wood Preservers Association StandardsThe official Standards for Highway and Incidental Structures, maintained on the Administration website. The latest incorporated revisions issued on or before the date of advertisement of the Contract. with EPAEnvironmental Protection Agency pesticide registrations.
(e) Wood used for hand-contact surfaces such as handrails, playground equipment and picnic tables shall be treated per M 133 and AWPAAmerican Wood Preservers Association StandardsThe official Standards for Highway and Incidental Structures, maintained on the Administration website. The latest incorporated revisions issued on or before the date of advertisement of the Contract..
(f) Wood preservative pesticides shall be registered with the EPAEnvironmental Protection Agency 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.
Pressure treatment shall conform to the following:
Wood AWPAAmerican Wood Preservers Association End Use

Category

AWPAAmerican Wood Preservers Association Standard
BridgeA structure including supports erected over a depression or an obstruction, such as water, highway, or railway, and having a track or passageway for carrying traffic or other moving loads, and having an opening measured along the center of the roadway of more than 20 feet between undercopings of abutments or spring lines of arches, or extreme ends of openings for multiple boxes; it may also include multiple pipes, where the clear distance between openings is less than half of the smaller contiguous opening. For lengths, all dimensions shall be parallel to the center line of the roadway. The dimensions of handrails will not be taken into account in measuring bridge lengths. Any bridge or highway grade separation structure includes the connecting highways, substructure, superstructure, roadway approaches, entrance plazas, interchanges, overpasses, underpasses, and other structures which the Administration may deem necessary together with all property rights, easements, franchises, and interests acquired by the Administration for the construction and operation of the bridge. structures including decking, guard rail posts and offset blocks UC4B - Ground Contact Heavy Duty U1: Commodity SpecificationA written description of functional characteristics, or the nature of a construction item to be procured. It may include a A (sawn products)
Foundation piles UC4C - Ground Contact Extreme Duty U1; Commodity SpecificationA written description of functional characteristics, or the nature of a construction item to be procured. It may include a E (round timber piling)
Wood Composites UC4A - Ground Contact, General Use U1; Commodity SpecificationA written description of functional characteristics, or the nature of a construction item to be procured. It may include a F (wood composites)
Sign posts, fence posts and gates UC4A - Ground Contact, General Use U1: Commodity Specifications A (sawn posts) and B (round posts)
Piling and bracing and bulk heading UC4B - Ground Contact Heavy Duty U1; Commodity Specifications A (sawn products), B (round products) and E (round timber piling)
921.07 CONDUITS.
921.07.01 Metallic Conduit.
MATERIAL SPECIFICATION
Electrical Metallic Tubing ULUnderwriters Laboratories, Incorporated 797
Intermediate Metal Conduit ULUnderwriters Laboratories, Incorporated 1242
Rigid Metal Conduit ULUnderwriters Laboratories, Incorporated 6
Rigid Steel Conduit, Zinc Coated ANSIAmerican National Standards Institute C80.1
Metallic Outlet Boxes ULUnderwriters Laboratories, Incorporated 514A
Fittings for Conduit and Outlet Boxes ULUnderwriters Laboratories, Incorporated 514B
921.07.02 Nonmetallic Conduit. The manufacturer shall furnish certification as specified in TC-1.03. Each length shall be stamped or embossed with the grade or type and applicable ULUnderwriters Laboratories, Incorporated or NEMANational Electrical Manufacturers' Association designation.
MATERIAL SPECIFICATION
Schedule 40 and 80 Rigid Polyvinyl Chloride (PVC) Conduit ULUnderwriters Laboratories, Incorporated 651
Electrical Plastic Tubing (EPT) and Electrical Plastic Conduit (EPC-40 and EPC-80) NEMANational Electrical Manufacturers' Association TC 2
Nonmetallic Outlet Boxes, Flush Device Boxes and Covers ULUnderwriters Laboratories, Incorporated 514C
Electrical Nonmetallic Conduit (ENC) NEMANational Electrical Manufacturers' Association TC 13
PVC Fittings for use with Rigid PVC Conduit and Tubing NEMANational Electrical Manufacturers' Association TC 3
Flexible PVC Coated Conduit ULUnderwriters Laboratories, Incorporated 360
Liquid Tight Flexible Nonmetallic Conduit for Detector Sleeves ULUnderwriters Laboratories, Incorporated 1660
921.07.03 PVC Coated Metallic Conduit. NEMANational Electrical Manufacturers' Association 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 x 18 x 36 in. and as specified.
921.09 POLYETHYLENE (PE) MANHOLES.
D 1248, Type III, Class C, Category 3, Grade P34. Submit working drawings prior to fabrication.
Compressive strength shall be determined per D 2412, 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 flow. Manholes for sanitary sewers shall have a factory molded invert for channeled flow.
The manufacturer shall furnish certification per TC-1.03. CertificationA document which verifies that the material and work complies with the applicable specifications and includes the actual test results to confirm the statement. The contents of the certification shall be on the Contractor's/vendor's/manufacturer's letterhead or approved document and shall be duly signed by a company officer. Certifications for metal products, when required, shall include a statement that the material was melted and manufactured in the United States except as provided in Section 165 of the Surface Transportation Assistance Act of 1982, as amended by Section 1041(a) and 1048(a) of the Intermodal Surface Transportation Efficiency Act of 1991 with regard to the furnishing and coating of iron and steel products. A nationwide waiver for this provision has been granted for pig iron and processed, pelletized, and reduced iron ore. 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. Fed. Std. 595 26622
921.11 DETECTABLE MARKING TAPE.
A direct-burial-rated subgrade detectable marking tape between 2 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 lbs. 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.
(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 to 36 inches 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.
SPECIAL PROVISION INSERTS

The following Special Provision Inserts update Section 921 after the official publication of the Standard SpecificationA written description of functional characteristics, or the nature of a construction item to be procured. It may include a. Updated documents may be found within the Standard and Supplemental Specifications for Construction and Materials on the MDOTMaryland Department of Transportation SHA web page.

SPI-Section 921-Miscellaneous. Dated 5/11/2018.