DMS EPOXIES AND ADHESIVES

Transcription

1 DMS EFFECTIVE DATES: OCTOBER 2007 MAY Description. This Specification details requirements for various types of epoxy and adhesive materials suitable for highway use. These materials consist of a resin component and a hardener component or a catalyzing agent mixed to produce the finished product. All epoxies and adhesives must be resistant to the action of weathering, moisture, acids, alkalis, and other environmental factors. This Specification describes the following types of epoxies and adhesives: Type I (Classes A, B, and C) precast concrete segment adhesive Type II traffic marker adhesives Type III (Classes A, B, and C) dowel and tie bars adhesives Type IV bridge deck sealant and adhesive Types V and VII concrete adhesives Type VIII (Classes A and B) binder for producing grout or concrete Type IX epoxy for crack injection Type X epoxy coating for concrete Units of Measurements. The values given in parentheses (if provided) are not standard and may not be exact mathematical conversions. Use each system of units separately. Combining values from the two systems may result in nonconformance with the standard Material Producer List (MPL). The Materials and Pavements Section of the Construction Division (CST/M&P) maintains a quality monitoring program (QMP) for epoxies and adhesives, as outlined in DMS Materials listed on the MPL, entitled "Epoxies and Adhesives, do not require further testing, unless deemed necessary by the Engineer. Products that are not currently on the MPL require project-specific testing and approval before their use, unless otherwise shown on the plans. Submit samples with a certified test report from an independent laboratory with test data verifying that the material meets the requirements stated within this Specification. Do not use this material until testing is complete Sampling and Testing. The Department samples in accordance with Tex-734-I and tests in accordance with and other test procedures as stated. Costs of sampling and testing are normally borne by the Department; however, the costs of sampling and testing of material failing to conform to the requirements of this Specification are borne by the Contractor or supplier. Costs of sampling and testing failing material will be assessed at the rate established by the Director of CST/M&P in effect at the time of testing. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

2 Amounts due to the Department for conducting such tests will be deducted from monthly or final estimates on Contracts or from partial or final payments on direct purchases by the State Material Properties. A. Type I Precast Concrete Segment Adhesive. 1. Description. Type I adhesives are used for the joining of precast bridge segments. The adhesive functions as a lubricant during the joining of the match cast segments and as a durable, watertight bond at the joint. There are three epoxy classes: Class A low temperature. This formulation provides a fast reacting system for placement when the concrete temperature is between 40 F and 60 F (4 C and 16 C). Class B medium temperature. This formulation is suitable for placement when the concrete temperature is between 55 F and 80 F (13 C and 27 C). Class C high temperature. This formulation is suitable for placement when the concrete temperature is between 77 F and 105 F (25 C and 41 C). 2. Physical Requirements. Table 1 describes the requirements for precast concrete segment adhesive. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

3 Table 1 Type I s Workability Class 60 F (16 C) Class 80 F (27 C) Class 105 F (41 C) Contact Time, min. Class 60 F (16 C) Class 80 F (27 C) Class 105 F (41 C) Thixotropy, in. (mm) Class 60 F (16 C) Class 80 F (27 C) Class 105 F (41 C) Tensile Bond 24 hr., psi (MPa) Class 40 F (4 C) Class 55 F (13 C) Class 77 F (25 C) The mixed adhesive must be sufficiently fluid to apply by spatula or trowel without any difficulty (5.0) Max 290 (2.00) Compressive 24 and 48 hr., psi (MPa) Class 40 F (4 C) Class 55 F (13 C) At 24 hr. - 2,000 (14.0) At 48 hr. - 6,000 (41.5) Class 77 F (25 C) 120 F (49 C) ASTM D The adhesive has a low sensitivity to damp conditions during application. After curing, the adhesive exhibits high bonding strength to cured concrete, good water resistivity (resistance), and low creep characteristics. B. Type II Traffic Marker Adhesive. 1. Description. Type II adhesive is designed for machine application and suitable for bonding ceramic, plastic, or metal markers to concrete pavements. Include the following information with every shipment: proper type of dispensing equipment to be used and weather conditions, during application, that are detrimental to material performance. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

4 2. Physical Requirements. Table 2 describes the requirements for traffic marker adhesive. Table 2 Type II Tensile 2 hr., psi (MPa) Stability, % increase Increase in Viscosity after 14-day heat 120 F (49 C) Difference in Viscosity Between the 2 Components, % Tensile Shear Strength, psi (MPa) Impact Strength, ft.-lb. (N-m) Wet Strength, psi (MPa) 120 F (49 C) (sag on test panel), in. (mm) 7 20 Max 15 Max 1,800 (12.40) 6-1/2 (9.0) 270 (1.85) 0.2 (5.0) Max Table 3 indicates the approximate set time for field conditions for traffic marker adhesive. Table 3 Approximate Set Time for Type II Epoxy Pavement Temperature Set Time (Hr.) 115 F (46 C) F (35 C) F (25 C) F (16 C) F (10 C) 7.0 The ratio of the epoxy adhesive resin to hardener components is 1:1 by volume. The producer must not use alumina or hard abrasive materials that might abrade or damage the application equipment as fillers. The producer must distinctly pigment each component of adhesive to produce a third color similar to concrete when properly mixed. C. Type III Dowel and Tie Bar Adhesive. 1. Description. Type III adhesives are used to anchor dowels and tie bars in concrete and are suitable to bond steel to hardened concrete. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

5 There are three classes: Class A is a bulk material used in applications where the anchor is placed in a horizontal orientation. Class B is a bulk material used only in applications where the anchor is placed in a vertical orientation, but not overhead. Class C is either a cartridge dispensed material or a bulk material for machine application only. Class C is used for either horizontal or vertical application. NOTE: Vertical overhead applications are not allowed. 2. Physical Requirements. Table 4 describes the requirements for dowel and tie bar adhesives. Physical Property Viscosity of mixed components, poise (Pa-s) Tensile 6 hr., psi (MPa) Tensile 120 F (49 C), psi (MPa) 120 F (49 C), mils (mm) Wet Pullout 1 Strength, lbf. (kn) Test Method Table 4 Type III Requirements Class A Class B Class C ,200 (120) Max 400 (2.8) 30 (0.75) 4,500 (20) 20 (2) 150 (15) Max 400 (2.8) (2.8) - 30 (0.75) 4,500 (20) 4,500 (20) 1. The wet pullout test determines the strength of the adhesive bond between a steel anchor and the surface of a hole in concrete or masonry units. The producer must distinctly pigment each component of adhesive to produce a third color when properly mixed. The fillers present in Class A and B must not abrade or damage the dispensing equipment. Use a 1:1 extruder with fully contained proportioning and dispensing system for two-component adhesives to handle the viscosity range defined in this Specification for Class A (horizontal) and Class B (vertical) applications. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

6 D. Type IV Bridge Deck Sealant and Adhesive. 1. Description. Type IV adhesive is a low viscosity epoxy intended for use in sealing cracks in concrete and restoring its structural integrity. 2. Physical Requirements. Table 5 describes the requirements for bridge deck epoxy. Table 5 Type IV Viscosity of Mixed Components, centipoise (Pa-s) Compressive 5% strain after 48-hr. 77 F (25ºC), psi (MPa) Wet Strength, psi (MPa) Track-Free 77 F (25ºC), hr. ASTM C mil thickness 125 (0.125) Max 25 5,000 (34.5) 350 (2.4) 5 8 Max The consistency of epoxy allows for the filling of voids in concrete by gravity flow. The epoxy has the capability of bonding to damp surfaces without shrinking, swelling, or cracking during or after its curing process. E. Type V and Type VII Concrete Adhesives. 1. Description. Type V and Type VII adhesives are used to bond fresh concrete to existing concrete and to bond hardened concrete to hardened concrete. Type V is suitable for sealing the surface of fine cracks in concrete or for waterproofing applications and designed for applying to horizontal and vertical surfaces. Type VII is a high-viscosity epoxy for vertical wall and overhead application where a high build-up is required. Type VII is also suitable for sealing the surface of cracks in concrete. 2. Physical Requirements. Table 6 describes the requirements for concrete adhesives. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

7 Table 6 Type V and Type VII s Type V Type VII Tensile 6 hr., psi (MPa) Viscosity of Mixed Components, poise (Pa-s) Stability, % increase Increase in Viscosity after 14-day heat 120 F (49 C) Bond Strength of fresh concrete to cured concrete, psi (MPa) 400 (40) Max 1,200 (120) 20 Max 20 Max 350 (2.4) 300 (2.10) The ratio of resin and hardener components is either 1:1 or 2:1 by volume. The concrete adhesive must not contain volatile solvents. F. Type VIII Binder for Producing Grout or Concrete. 1. Description. Type VIII epoxies are binder materials mixed with select aggregates to form a quick-setting epoxy for use in concrete repair. There are two classes: Class A is a low-modulus epoxy grout used to repair spalls, chipped areas, and other defects in precast concrete. Class B is a high strength epoxy grout used to repair potholes, cracks or spalls, and other defects in concrete. 2. Physical Requirements. Table 7 describes the requirements for binder components of the epoxy grout without aggregate. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

8 Table 7 Type VIII (Binder) Stability, % increase Increase in Viscosity after 14-day heat 120 F (49 C) Tensile 24 hr. for Class A and 6 hr. for Class B, psi (MPa) Class A Class B Max 20 Max Water Gain, % 0.5 Max - Elongation, % Tex-618-J 40 - Table 8 describes requirements for the complete epoxy grout (binder and aggregate). Table 8 Type VIII (Grout) Class A Class B Compressive Strength, 500 (3.4) 5,000 (34.5) psi (MPa) Tex-618-J Resilience, % 70 - Old concrete to new grout mix, psi (MPa) 200 (1.4) 290 (2.0) Thixotropy (sag on test panel), in. (mm) 0.2 (5.0) Max 0.2 (5.0) Max The manufacturer must include the suitable mixing ratio on the label of every container for the resin, hardener, and the aggregate mix by volume. The manufacturer must specify the type and gradation of aggregate in the binder/aggregate mixture. G. Type IX Epoxy for Crack Injection. 1. Description. Type IX epoxy is a low viscosity epoxy adhesive to be pressure-injected into cracks in concrete to restore its structural integrity. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

9 2. Physical Requirements. Table 9 describes the requirements for epoxy for crack injection. Table 9 Type IX Viscosity of Mixed Components, centipoise (Pa-s) Wet Strength, psi (MPa) 20 1,000 (1.0) Max 250 (1.7) Type IX epoxy is capable of bonding to damp surfaces. The pigment of the mixed adhesive is gray in color with no streaks. H. Type X - Epoxy Coating for Concrete. 1. Description. Type X epoxy is a high-solids epoxy coating designed mainly as a coating for pier caps and the interior walls of rest areas. 2. Physical Requirements. Table 10 describes the requirements for the resin component of epoxy coating for concrete. Table 10 Type X (Resin Component) Grind (Fineness of Dispersion), Hegman 4 Table 11 describes the requirements for the mixed resin and hardener components of epoxy coating for concrete. Table 11 Type X (Mixed Resin and Hardener Components) Thixotropy, mil (mm) Thickness retained from a coating of 10 mil (0.25 mm) Hiding Power (contrast ratio) 80, 160 Max 8 (0.20) Packaging and Labeling. Package components in airtight containers and protect from light and moisture. Include detailed instructions for the application of the material and all safety information and warnings regarding contact with the components. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14

10 The label must include the following: resin or hardener components; brand name; name of manufacturer; lot or batch number; temperature range for storage; date of manufacture; expiration date; and quantity contained therein Storage. Store the epoxy and adhesive components at temperatures recommended by the manufacturer. Do not use damaged or previously opened containers and any material that shows evidence of crystallization, lumps, skinning, extreme thickening, or settling of pigments that cannot be readily dispersed with normal agitation Environmental Requirements. Follow sound environmental practices when disposing of epoxy and adhesive wastes. Dispose of all empty containers separately. Dispose of individual components by mixing according to manufacturers' instruction and allowing the mixed adhesive to cure before disposal. Dispose of epoxy adhesive provided in prepackaged containers by completely emptying and mixing the epoxy before disposal Archived Versions. Archived versions are available. TEXAS DEPARTMENT OF TRANSPORTATION /07 05/14