Material Properties
The membrane waterproofing system shall consist of the following:
- Primer
- One or two coat rapid curing cold liquid spray applied seamless methyl methacrylate, polyurea, or polyurethane methyl methacrylate membrane
- Aggregate keycoat
- Polymer modified tack coat
The Spray Applied Waterproofing Membrane System shall be asbestos-free. The chemical composition of the primer, membrane, aggregate keycoat and tack coat that make up the membrane waterproofing system shall conform to the manufacturer’s specifications for the material. All components shall be approved by the manufacturer as being compatible for use with the specified membrane. Cleaning solvents shall also be approved by the manufacturer for use with the membrane.
Primer Material Properties for Spray Applied Membrane Systems (M9.08.1):
The primer shall promote adhesion of the membrane to the concrete surface.
The Primer shall meet the criteria specified in Table M9.08.1-1 of the Standard Specifications.
| Property | Test | Requirements |
|---|---|---|
| Gel Time | > 5 minutes | |
| Tack Free Time | < 2.5 hours, max at 77ºF | |
| Adhesion to Concrete | ASTM D7234 | ≥ 100 psi minimum and failure in concrete |
Membrane Material Properties for Spray Applied Membrane Systems (M9.08.1):
The Membrane shall meet the following requirements:
- The total minimum base thickness for the Membrane shall be 80 mils measured over peaks.
- The Membrane shall easily accommodate the need for day joints and patch repairs.
- The Membrane shall be able to bridge live cracks up to 1/8 inch in width.
- The Membrane shall meet the criteria specified in Table M9.08.1-2 of the Standard Specifications.
| Property | Test | Requirements |
|---|---|---|
| Solids Content | 100% | |
| Stability | ASTM C836 | ≥ 6 months |
|
Crack Bridging (Neat Material + Aggregated Keycoat) |
ASTM C1305* | Pass, no cracking |
| Extensibility after Heat Aging | ASTM C1522 | For information only |
| Percent Elongation at Break | ASTM D638 | ≥ 130% |
| Tensile Strength |
ASTM D638 Type IV @ 2 in/min |
> 1,100 psi |
| Shore Hardness | ASTM D2240** | ≥ 40 Type D |
|
Minimum Thickness (Membrane only) |
ASTM D6132 or other approved method |
≥ 80 mils minimum measured over peaks or ≥ thickness used to pass ASTM C1305 (Whichever thickness is greater) |
| Membrane Waterproofing System Adhesion to Concrete | ASTM D7234 |
≥ 100 psi minimum and failure in concrete |
| Water Vapor Transmission – Permeance |
ASTM E96 Water Method Procedure B |
≤ 1.0 perms [grains / (hr·ft2·in. Hg)] |
Notes:
* ASTM C1305 shall be modified to 25 cycles at -15℉ no failure at ⅛ in. per hour.
** Durometer Specification change on the MassDOT construction specifications is pending.
Aggregate for Keycoat Material Properties for Spray Applied Membrane Systems (M9.08.1):
The broadcast aggregate shall be durable and provide shear resistant to prevent the hot mix asphalt (HMA) from shoving. Aggregate shall have a minimum Mohs hardness rating of seven (7) and be approved by the manufacturer.
Polymer Modified Tack Coat Material Properties for Spray Applied Membrane Systems (M9.08.1):
The tack coat shall consist of either a polymer modified asphalt emulsion, or a polymer modified asphalt binder approved for use by the membrane waterproofing manufacturer and the Engineer. The tack coat may either be supplied by the membrane waterproofing manufacturer or by a MassDOT approved asphalt emulsion Supplier.
Submittal and Testing Requirements
A manufacturer requesting approval of a spray applied membrane system shall furnish to MassDOT RMS the following:
- The material specifications and performance data for their product.
- Detail drawings.
- Detail drawings must clearly display the complete Spray Applied Waterproofing Membrane System assembly.
- Detail drawings must also clearly label all sub-components used within the assembly by their corresponding component types and product names.
- If a Spray Applied Waterproofing Membrane System can use multiple products for a specific sub-component type, then the manufacturer must submit drawings which clearly demonstrate this.
- Certified independent test reports as specified under the Independent Testing Requirements section shown below.
- Samples for testing as specified under the MassDOT Testing Requirements section shown below.
All submittals shall be certified to be in conformance with the manufacturer’s instructions. Systems qualified by MassDOT per the performance criteria shall be considered for placement on the MassDOT QCML.
Independent Testing Requirements:
All submitted independent test results shall meet the following requirements:
- The Certified independent test reports submitted must demonstrate conformance to Table M9.08.1-2.
- The independent lab must be recognized by the National Cooperation for Laboratory Accreditation (NACLA) in Construction Materials Engineering and Testing (CMET) or an equal program approved by Research and Materials.
- All testing shall be performed by one independent lab unless approved by the Engineer.
- Independent test reports must be dated within two years from the initial submission.
- Samples for all required testing shall be fabricated at the same time. Test reports shall denote the lot of material as well as the sample fabrication and testing dates.
MassDOT Testing Requirements:
MassDOT shall perform prequalification testing on the membrane.
The manufacturer shall submit two (2) 10-inch by 10-inch square samples of the proposed membrane with smooth surfaces (no primer or aggregate in the keycoat). The samples shall either be a minimum of 80 mils thick OR the thickness used to pass the crack bridging requirement found in Table M9.08.1-2 (whichever is greater).
Product Listing, Expiration, and Re-Approval
Once approved, the Spray Applied Waterproofing Membrane System will be listed on the MassDOT QCML. The product shall remain on the approved list five (5) years unless one of the following occurs:
- If the product’s technology changes.
- If the product formulation or technology changes, the Manufacturer shall notify MassDOT RMS.
- MassDOT RMS determines that the product no longer meets the minimum requirements.
A written request for re-approval must be submitted to the Department at least 90 days prior to the expiration date for the product to remain on the QCML.