9-121 Section 914. Joint and Waterproofing Materials
914.01 General Requirements
Joint and waterproofing material s for use in concrete construction must meet the requirements of this section.
914.02 Testing
Steel joint material testing must be in accordance with ASTM E8/E8M or ASTM A370 and the ASTM specifications applicable to the specific material. Other joint and waterpro ofing material testing must be in accordance with the specified ASTM, AASHTO , or Department methods, as modified by this section.
914.03 Joint Filler for Concrete Construction
Cut joint filler into the shape and to the dimensions shown on the plans . Joint filler must not deform or break due to twisting, bending, or handling when exposed to atmospheric conditions . For concrete pavements, punch holes in the fiber joint filler for load transfer bars in new concrete pavements , as shown on the plans.
A.Fiber Joint Filler . Fiber joint filler must meet the requirements of ASTM D1751.
B.Recycled Rubber Joint Filler . Recycled rubber joint filler must meet the requirements of ASTM D 1751 except that the minimum asphalt content does not apply .
C.Closed -Cell Polypropylene Foam . Semi -rigid, closed-cell polypropylene foam joint filler must meet the requirements of ASTM D8139.
914.04 Joint and Crack Sealants for Construction
A.Hot-Pour ed Joint and Crack Sealant . Hot-poured joint and crack sealant must meet the requirements of the Qualified Products List for Hot-Poured, Extra Low Modulus, Joint and Crack Seal ant. Material containers must be legibly marked with a non-fading, weather -resistant ink or paint . Include the manufacturer ’s name or trade name, batch number, recommended pouring temperature, and the maximum safe heating temperature on the label.
B.Backer Rod for Use with Hot -Poured Joint Sealant . Backer rod for use with a hot -poured joint sealant must be solid, round, heat -resistant, closed -cell, cross-linked PE foam meeting the requirements of ASTM D5249 for Type I. MDOT Standard Specifications for Construction Section 914 9-122 914.05. Joint Spall Repair Materials Select joint spall repair material according to the contract .
914.06 Epoxy Resin Adhesive
Epoxy resin adhesive must be capable of being injected into, and flow along, a crack 0.005 inch wide. Select epoxy -resin adhesive from the Qualified Products List. Use a fast -setting grout or fast -set temporary seal as recommended by the epoxy resin adhesive manufacturer.
914.07 Dowel Bars for Transverse Expansion and Contraction Joints
Dowel bars must meet the requirements of ASTM A1078/A1078M. Provide dowel baskets from a Department -approved source. Secure the dowel bars into the baskets by welding or other mechanical method so the dowels maintain alignment during and after concrete placement. The ends of dowel bars for expansion and contraction joints must be saw cut or sheared and free of burrs . If dowel bars are sheared, ensure that the ends remain round and do not deform . Dowel bars that are not free of burrs, deformation, or other surface defects will be rejected. Protect dowel bars during handling and storage according to ASTM A 1078/A1078M .
A.Coatings for Dowel Bars . If required, provide dowel bars coated with an epoxy powder coating meeting the requirements of the Qualified Products List. The epoxy powder must be pigmented purple or gray. The Engineer may sample and test dowel bars for average coating thickness, and check for chips, cracks, or other damage to the coating and for the presence of a bond breaker, if required, before ins tallation in the concrete construction. Dowels with coatings not meeting the thickness requirements or dowels with coating damage will be rejected . Epoxy -coated dowel bars must have an average coating thickness of not less than 0.010 inch or more than 0.014 inch on any bar, with individual determinations on a single bar within 0.004 inch of the average. Coating is not required on the end faces of the bars or on the cylindrical surface within 3 inches of the end fixed in the supporting basket by welding or other mechanical means. To prevent bonding to concrete, epoxy -coated dowels must be coated with an asphalt material meeting the requirements of MC 70 or RC 250, as specified in subsection 904.03.B , or an alternat ive bond-release agent selected from the Qual ified Products List . Bond-release agents must provide a pull -out shear bond stress of the dowel bar no greater than MDOT Standard Specifications for Construction Section 914 9-123 60 psi for initial and final movement of the dowel from the concrete specimen. The Contractor or supplier may apply asphalt ic coatings to the dowel bar and the dowel basket assembly . The manufacturer must apply the alternat ive bond-release agents to the dowel bar and the dowel basket assembly.
B.Dowel Bar Expansion Caps . Dowel bars for expansion joints must include metal or plasti c expansion caps as shown on the plans and approved by the Engineer . Expansion caps must be sized to provide a slip fit onto the coated bar. Expansion caps must have a uniform diameter for a length of at least 4 inches and must inc lude a stop to ensure tha t the end of the cap remains at least 1 inch away from the end of the dowel bar during concrete placement . Fabricate metal expansion caps from at least 28-gauge sheet steel and close at the sides and end by crimping. Plastic expansion caps must be one piec e with a uniform thickness of at least 1/16 inch, entirely closed on the end.
914.08 Devices for Transverse End -of-Pour Joints
Use straight steel tie bar devices for end-of -pour joints. Straight tie bars for end-of -pour joints must consist of bars of the diameter and length shown on the plans meeting the requirements of ASTM A615/A615M , ASTM A706/A706M , or ASTM A996/A996M (Type R or Type A ). Epoxy coat straight tie bars as specified in subsection 905.03.C except that the application of the epoxy coating within 4 inches of each end of the tie bar or the repair of damage to the coating within 4 inches of each end of the bar is not required.
914.09 Lane Ties for Longitudinal Pavement Joints
A.Straight Tie Bars. Straight tie bars for longitudinal pavement joints must consist of bars of the diameter and length shown on the plans meeting the requirements of ASTM A615 /A615M , ASTM A706/A706M , or ASTM A996/A 996M (Type R or Type A ). Epoxy coat straight tie bars as specified in subsection 905.03.C except that the application of the epoxy coating within 4 inches of each end of the tie bar or the repair of damage to the coating within 4 inches of each end of the bar is not required.
B.Bent Tie Bars for Bulkhead Joints. Bent tie bars for bulkhead joints must consist of bars of the diameter and length shown on the plans . The tie bars must have a yield strength of at least 40,000 psi and be capable of withstanding bending to a 90° angle, re-straightening, and then MDOT Standard Specifications for Construction Section 914 9-124 withstanding the pull -out test requirements specified in subsection
602.03 F.
Epoxy coat bent tie bars as speci fied in subsection 905.03.C except that the application of the epoxy coating within 4 inches of each end of the tie bar or the repair of damage to the coating within 4 inches of each end of the bar is not required.
914.10 Structure Expansion Anchors and Bolts
Select expansion anchors from the Qualified Products List in the sizes and shapes shown on the plans . Bolts for flush-type anchors must meet the requirements of ASTM A307 for Grade A.
914.11 Preformed Waterproofing Membranes and Joint Waterproofing
Select preformed waterproofing fabric system, including the manufacturer ’s recommended primer, from the Qualifi ed Products List.
914.12 Elastomeric Bearings and Pads
A.Bearings . Elastomeric bearings must meet the requirements of the AASHTO LRFD Bridge Construction Specifications , Subsection 18.2, “Elastomeric Bearings ,” for 100% virgin polychloroprene (neoprene) or polyisoprene (natural rubber) bearings and must be classified as being of low-temperature Grade 4 or 5. Laminated bearings must have a shear modulus of 100 psi ±15 psi . Plain bearings must have a shear modulus of 200 psi ±30 psi . Rolled steel sheet laminate s must meet the requirements of ASTM A36 /A36M or ASTM A1011 /A1011M , Grade 36, Grade 40, or Grade 50. Blast -clean the surfaces of the laminates where el astomers are to be bonded. Elastomeric bearings must be tested and accepted in accordance with Section 8 of AASHTO M 251 except that the definition of a lot specified in Subsection 8. 2 of AASHTO M251 is revised as follows: Sampling, testing, and acceptance consideration will be made on a lot basis . A lot of bearings must be considered to be a group of bearings that are manufactured over a 4-month period from the same elastomer recipe, cured under the same conditions, and type (plain, fabric laminated, or steel -laminated).
B.Leveling Pads. Elastomeric leveling pads (1/8 inch thick or as specified in the contract) must meet the requirements of the AASHTO LRFD Bridge Construction Specifications , Subsection 18.2, “El astomeric Bearings ,” for 100% virgin polychloroprene (neoprene) or polyisoprene (natural rubber) bearings and must be classified as being of low -temperature Grade 3. Leveling pads must be plain elastomer and have a hardness between MDOT Standard Specifications for Construction Section 914 9-125 50 and 70 on the Shore A scale . Provide certification to the Engineer that elastomeric leveling pads conform to this subsection. Elastomeric leveling pads must be tested and accepted in accordance with Appendix X1 of AASHTO M251 except that a lot is defined to be material that is manufactured from the same elastomer recipe and cured under the same conditions and tested no less than once per year.
914.13 Non-Metallic Washers
Washers used as spacers between pin plates and link plates must be HDPE , non-metallic washers meeting the requirements of ASTM D4976, Group 2, Class 4, Grade 4.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 931–935 of 1,146.