Section 4 DMS-9203, Asphaltic Concrete Patching Material (Containerized)
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1 Section 4 DMS-9203, Asphaltic Concrete Patching Overview Effective Date: August December This Specification governs for rapid curing containerized asphaltic concrete mixture intended primarily for cool to cold, wet weather repair of small pavement areas. Classification This specification includes two (2) classes of containerized asphaltic concrete-patching material. Class I mixture shall meet the requirements for a rapid-curing asphaltic concrete. Class II mixture shall meet the requirements for a medium-curing asphaltic concrete. A mixture found to meet the requirements for Class I will be considered meeting the requirements for Class II. Properties of the Mixture Class I - Rapid-Curing Asphaltic Concrete General The mixture shall have good adhesion to wet surfaces and be resistant to water damage. It shall consist primarily of crushed stone, rapid-curing cutback asphalt, and additives. The mixture must be uniform and not require any remixing of the contents of a given container prior to use. Test Requirements When tested according to standard TxDOT test methods and ASTM procedures indicated, the mixture shall comply with the following requirements. The Materials & Pavements Section Director of the Construction Division has the discretion to waive any portion of the testing procedures when it has been determined that this waiving will not affect the acceptance decision. Asphalt Content Exclusive of Volatiles Percent by Weight Aggregate Gradation Sieve Percent by Weight Departmental Material Specifications 5-13 TxDOT 04/2006
2 Asphalt Content Exclusive of Volatiles Passing 1/2" 100 Passing 3/8" 95 to 100 Passing 1/4" 75 to 100 Passing 1/4", Retained on No to 75 Passing No. 10, Retained on No to 30 Passing No. 40, Retained on No to 15 Passing No. 80, Retained on No to 10 Passing No to 6 Hydrocarbon Volatile Content of Mix Percent by Weight Moisture Content of the Mix Percent by Weight Distillation Range of Volatiles Recovered from Mix Distillate, expressed as percent by volume of total volatiles recovered from mix when tested by ASTM D 86 Off at 149 C (300 F) 0 15 Off at 177 C (350 F) Off at 204 C (400 F) Off at 232 C (450 F) Properties of Asphalt Extracted from the Mix Penetration, 25 C (77 F), 100 g, 5 sec Ductility at 25 C (77 F), 5 cm/min, cms Stability and Density Properties Stability of as-received mix (no curing) at 25 ±1 C (77 ±2 F), (molded at 25 ±1 C [77 ±2 F]) Stability of Cured Mix at 60 C (140 F), (cured and molded at 60 C [140 F]) Density (Mixed, cured, and molded at 60 C (140 F) - Percent density shall be the ratio of the compacted specific gravity to the theoretical maximum specific gravity determined by "Tex-227-F, Theoretical Maximum Specific Gravity of Bituminous Mixtures"). 35% - 40% - 90% 96% Departmental Material Specifications 5-14 TxDOT 04/2006
3 Asphalt Content Exclusive of Volatiles Resistance to Water Damage The as-received mix shall be evaluated by "Tex-530-C, Effect of Water on Bituminous Paving Mixtures." It must not evidence more than ten (10) percent stripping of the aggregate surfaces. Class II - Medium-Curing Asphaltic Concrete General The mixture shall have good adhesion to wet surfaces and be resistant to water damage. It shall consist primarily of crushed stone, the designated type of asphalt, and additives. The mixture must be uniform and not require any remixing of the contents of a given container prior to use. The Engineer will designate on the plans or requisition which of the following combinations of asphalt and aggregate may be supplied, meeting all requirements stated below: Asphalt Aggregate MC-250 MC-800 MC-800 w/ Diesel SCM I SCM II AES 300S Item 334 x x x x - x Gradation I x x x x x x Gradation II x x x x x x Materials Asphaltic Material - The asphaltic material shall be an MC-250, MC-800, SCM I, SCM II, or AES-300S meeting the requirements below. The specific asphaltic material to be used shall be designated by the Engineer on the plans or requisition. 1. MC-250 or MC The asphaltic materials shall comply with the requirements of Standard Specification Item 300, Asphalts, Oils, and Emulsions. 2. SCM I (Special Cutback Material I) Tests on SCM I Flash Point Tex-512-C (see Note) 79 C (174 F) Water Tex-501-C et al (see Note) 0.2% Maximum Kinematic Viscosity at 60 C (140 F) Tex-529-C (see Note) 500 to 1,000 cst Distillation expressed as a percent by volume of total distillate to 360 C (680 F) Tex-515-C (see Note) Min. Max. Departmental Material Specifications 5-15 TxDOT 04/2006
4 Tests on SCM I Flash Point Tex-512-C (see Note) 79 C (174 F) Off at 225 C (437 F) 0 0 Off at 260 C (500 F) Off at 315 C (600 F) Residue at 360 C (680 F), Volume % Tests on Distillation Residue Penetration at 25 C (77 F), 150 g, 5 sec. (ASTM D 5 procedure, except using cones conforming to ASTM D 217. Also, the level of water in the transfer dish shall be lowered to less than the height of the sample and water decanted from top of sample before transferring from the bath to the penetrometer.) 180 Solubility in Trichloroethylene Tex-507-C (see Note) 99% NOTE: Refer to "Tex-501-C, et al Test Methods for Various Bituminous Materials." 3. SCM II (Special Cutback Material II) - SCM II is allowed for Aggregate Gradations I and II only. Tests on SCM II Flash Point Tex-512-C (see Note) 79 C (174 F) Water Tex-501-C (see Note) 0.2% Maximum Kinematic Viscosity at 60 C (140 F) Tex-529-C (see Note) 1,000 to 2,000 cst Distillation expressed as a percent by volume of total distillate to 360 C (680 F) Tex-515-C (see Note) Min. Max. Off at 225 C (437 F) 0 0 Off at 260 C (500 F) Off at 315 C (600 F) Residue at 360 C (680 F), Volume % Tests on Distillation Residue Departmental Material Specifications 5-16 TxDOT 04/2006
5 Tests on SCM II Flash Point Penetration at 25 C (77 F), 150 g, 5 sec Tex-512-C (see Note) ASTM D 5 procedure, except using cones conforming to ASTM D 217. Also, the level of water in the transfer dish shall be lowered to less than the height of the sample and water decanted from top of sample before transferring from the bath to the penetrometer. 79 C (174 F) 180 Ductility at 4 C (39.2 F), 1 cm/min Tex-503-C (see Note) 100 cm (39 in.) Solubility in Trichloroethylene Tex-507-C (see Note) 99% NOTE: Refer to "Tex-501-C, et al Test Methods for Various Bituminous Materials." 4. AES-300S - The emulsion shall be a high float, mixing-grade type utilizing a polymer-modified asphalt base. Tests for AES-300S Viscosity at 25 C (77 F), SSF Sieve Test - 0.1% 24-hour Storage Stability (Note 1) - 1% Stone Coating Good - Residue from 175 C (347 F) 65% 100% Oil Portion from Distillation, ml of oil per 100 g emulsion - 7% Tests on Distillation Residue Solubility in Trichloroethylene 97% - 60 C (140 F), sec C (77 F), 100 g, 5 sec Tests on Cured Residue** Elastic 10 C (50 F) 30% - **Method of Curing - Two rolling thin film containers of as-received cutback shall be poured and tested in accordance with ASTM D Note 1 - The undisturbed emulsion shall show no white milky substance at either the top of or bottom of the test cylinder after the 24-hour period. Departmental Material Specifications 5-17 TxDOT 04/2006
6 Asphaltic Additives. One or more asphalt additives to prevent stripping of the asphalt from the aggregate in the presence of water and promote bonding to damp or wet surfaces shall be incorporated into the mixture. The additive(s) shall be added to the asphalt material at the point of origin or be metered in at the mix plant to provide a uniform concentration of the agent(s). The type and amount of additive(s) used will be approved by the Engineer in the design stage based on the resistance to stripping, as described in 'Properties of the Mixture,' and desired bonding and workability characteristics. Distillate. When an MC-800 is designated as the asphaltic material to be used, the Engineer may also direct that distillate in amounts not to exceed five (5) percent by weight of the MC-800 be added in order to extend stockpile life and improve cold weather workability. The distillate shall meet the requirements for No. 1 or No. 2 diesel, ASTM D 975, with the exception that the maximum water content shall not be greater than 0.2 percent. The distillate shall be metered into the mix plant separately from the MC-800, or with the permission of the Engineer, may be blended with the MC-800. Aggregate. The aggregate shall meet the requirements for aggregate as specified in Standard Specification "Item 334, Hot Mix-Cold Laid Asphaltic Concrete Pavement." General Testing. When tested according to Standard TxDOT's test methods, the mixture shall comply with the following requirements: General Testing Requirements Asphalt Content, Exclusive of Volatiles, percent by weight Hydrocarbon Volatile content of Mix, percent by weight Moisture Content of Mix (this requirement does not apply to mixtures produced at mixing temperatures of 79 C [174 F] or less), percent by weight Hveem Stability at 60 C (140 F), percent (cured and molded in accordance with "Tex-206-F, Compacting Test Specimens of Bituminous Mixtures")** **The requirements for Hveem Stability are applicable to mixtures with "Item 334, Hot Mix-Cold Laid Asphaltic Concrete Pavement," gradations only. Mixture Design and Aggregate Gradation. One or more of the gradation types specified in "Item 334, Hot Mix-Cold Laid Asphaltic Concrete Pavement," for optimum density mixtures or of the open mixture gradations shown below, shall be designated by the Engineer on the plans or requisition. For mixtures to be produced with "Item 334, Hot Mix-Cold Laid Asphaltic Concrete Pavement" gradation, the mixture should be designed in accordance with "Tex-204-F, Departmental Material Specifications 5-18 TxDOT 04/2006
7 Design of Bituminous Mixtures" and the asphalt content selected to result in laboratory density as follows: Density (Percent) Maximum Optimum For mixtures to be produced with Gradation I or II below, the Engineer shall select the asphalt content within the range specified under Asphalt Content, above. Percent Passing (by weight) Sieve Size Gradation I Gradation II 1/2" / No No No No No The as-received mix shall be evaluated for resistance to water damage by soaking a 100- gram representative sample of the total mixture in 200 milliliters (seven [7] fluid ounces) of distilled or de-ionized water at 60 ± 1 C (140 ± 2 F) for 24 ± 2 hours. The soaking test shall be accomplished in a glass beaker of approximately 400 milliliters (fourteen [14] ounces). Upon completion of the 24-hour soaking period, the mixture shall be evaluated while submerged in the testing water. The material shall show no visible evidence of stripping. Preparation of Mixture Class I - Rapid-Curing Asphaltic Concrete When required by the Engineer, trial batches shall be made with various asphalt contents and/or gradations. The Engineer may designate a job mix formula based upon the results of trial batch testing. Class II - Medium-Curing Asphaltic Concrete The mixture shall be plant mixed. All production equipment shall meet the requirements of Standard Specification "Item 334, Hot Mix-Cold Laid Concrete Pavement." The asphaltic material Departmental Material Specifications 5-19 TxDOT 04/2006
8 shall be heated in accordance with Article 300.3, Storage, Heating, and Application Temperatures. The application temperature for SCM I and SCM II shall be 77 ± 93 C (170 to 200 F) unless otherwise specified by the material supplier. The application temperature for AES-300S shall be as specified by the material supplier. The temperature of the bituminous mixture at the point of discharge from the mixer and the temperature of the aggregate, when mixed with bituminous material shall not exceed 93 C (200 F) unless otherwise approved by the Engineer. The mixture shall be mixed until all of the aggregate is uniformly coated. Sampling for hydrocarbon volatile and moisture contents will be performed after the material has been placed in containers. Containers Class I and Class II mixtures shall be provided in airtight, resealable plastic buckets of fifteen- (15) to nineteen- (19) liter (four- [4] to five- [5] gallon) capacities. Archived Versions Archived versions of "DMS-9203, Asphaltic Concrete Patching," are available through the following links: Click on for the Specification effective July 1999 through July Departmental Material Specifications 5-20 TxDOT 04/2006
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