DMS ASPHALTIC CONCRETE PATCHING MATERIAL (STOCKPILE STORAGE)

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Sherman Dawson
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1 DMS (STOCKPILE STORAGE) EFFECTIVE DATES: AUGUST 2004 APRIL Description. This Specification governs for an asphaltic concrete mixture intended primarily as a cool to cold weather stockpile patching mix for maintenance. It will remain workable in the stockpile for six months and have good adhesion to wet surfaces. The length of satisfactory stockpiling and the lowest temperature at which it can be used will vary according to the type and grade of asphaltic binder specified. It is primarily a crushed-stone asphaltic-concrete with asphalt additives. The Engineer will designate on the plans or requisition which of the following combinations of asphalt and aggregate may be supplied, meeting all requirements listed in Table 1. Aggregate MC- 250 MC- 800 MC-800 w/diesel Table 1 Asphalt SCM I SCM II AES- 300S CMA SG Item 334 x x x x x Gradation I x x x x x x Gradation II x x x x x x x x Gradation III x x CMA WG 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. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

2 Materials. A. Asphaltic Material. Furnished asphaltic material should be an MC-250, MC-800, SCM I, SCM II, AES-300S, or CMA, meeting the requirements below. The Engineer designates the specific asphaltic material used on the plans or requisition. 1. MC-250 or MC-800. Provide the asphaltic materials compliant with the requirements of Standard Specification Item SCM I (Special Cutback Material I). Table 2 Tests on SCM I Flash Point Tex-512-C (see Note) 79 C (174 F) Minimum Water Tex-501-C (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. 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 % 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 is 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 Minimum Ductility at 4 C (39.2 F), 1 cm/min. Tex-503-C (see Note) 100 cm (39 in.) Minimum Solubility in Trichloroethylene Tex-507-C (see Note) 99% Minimum Note Refer to Tex-501-C. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

3 3. SCM II (Special Cutback Material II). SCM II is allowed for Aggregate Gradations I and II only. Table 3 Tests on SCM II Flash Point Tex-512-C (see Note) 79 C (174 F) Minimum 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 % 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 is 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 Minimum Ductility at 4 C (39.2 F), 1 cm/min. Tex-503-C (see Note) 100 cm (39 in.) Minimum Solubility in Trichloroethylene Tex-507-C (see Note) 99% Minimum Note Refer to Tex-501-C. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

4 4. AES-300S. The emulsion should be a high float, mixing-grade type utilizing a polymermodified asphalt base. Table 4 Tests on 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% Oil Portion from Distillation, ml of oil per 100 g emulsion 7% Solubility in Trichloroethylene 97% 60 C (140 F), sec C (77 F), 100 g, 5 sec 300 Tests on Cured Residue** Elastic 10 C (50 F) 30% **Method of Curing: Two rolling thin film containers of as-received cutback is poured and tested in accordance with ASTM D Note 1 The undisturbed emulsion will not show white milky substance at either the top of or bottom of the test cylinder after the 24-hour period. Min. Min. Max. Max. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

5 5. Cold Mix Asphalt Summer Grade (CMA-SG). CMA-SG is allowed for Aggregate Gradations II and III. Table 5 Tests on CMA-SG Flash Point Tex-512-C (see Note) 70 C (158 F) Minimum Water Tex-501-C (see Note) 1.0% Maximum Viscosity at 25 C (77 F) Distillation expressed as percent by volume of total distillate to 360 C (680 F) ASTM D 4957 #200 Modified Koppers Viscometer at 300 mm of Vacuum 3,000-5,000 P Tex 515-C (see Note) Min. Max. Off at 225 C (437 F) 0 0 Off at 260 C (500 F) 0 5 Off at 315 C (600 F) Residue at 360 C (680 F), Volume % Penetration at 25 C (77 F), 100 g, 5 sec Tex-502-C (see Note) Float Test at 60 C (140 F), sec Tex-519-C (see Note) 1,200 Minimum Solubility in Trichloroethylene Tex-507-C (see Note) 99% Minimum Note Refer to Tex-501-C. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

6 6. Cold Mix Winter Grade (CMA-WG). CMA-WG is recommended for Aggregate Gradations II and III. Table 6 Tests on CMA-WG Flash Point Tex-512-C (see Note) 70 C (158 F) Minimum Water Tex-501-C (see Note) 1.0% Maximum Viscosity at 25 C (77 F) Distillation expressed as percent by volume of total distillate to 360 C (680 F) ASTM D 4957 #200 Modified Koppers Viscometer at 300 mm of Vacuum 1,500-4,000 P Tex 515-C (see Note) Min. Max. Off at 225 C (437 F) 0 0 Off at 260 C (500 F) 0 5 Off at 315 C (600 F) Residue at 360 C (680 F) Volume % Penetration at 25 C (77 F), 100 g, 5 sec Tex-502-C (see Note) Float Test at 60 C (140 F), sec Tex-519-C (see Note) 1,200 Minimum Solubility in Trichloroethylene Tex-507-C (see Note) 99% Minimum Note Refer to Tex-501-C. B. Asphaltic Additives. Incorporate one or more asphalt additives into the mixture to prevent stripping of the asphalt from the aggregate in the presence of water and promote bonding to damp or wet surfaces. Add the additives to the asphalt material at the point of origin or meter in at the mix plant to provide a uniform concentration of the agents. The Engineer will approve the type and amount of additives used in the design stage based on the resistance to stripping, as described in Article and desired bonding and workability characteristics. C. 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 5% by weight of the MC-800 be added in order to extend stockpile life and improve cold weather workability. Furnish the distillate that meets the requirements for No. 1 or No. 2 diesel, ASTM D 975, with the exception that the maximum water content does not exceed 0.2%. Meter the distillate into the mix plant separately from the MC-800, or with the permission of the Engineer, blend with the MC-800. D. Aggregate. Furnish aggregate that meets the requirements for aggregate as specified in Standard Specification Item 334. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

7 Mixture Properties. A. General Testing. Provide a mixture that complies with the following when tested according to standard Department test methods. Table 7 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**) 35 **The requirements for Hveem Stability are applicable to mixtures with Item 334 gradations only. B. Mixture Design and Aggregate Gradation. The Engineer will designate on the plans or requisitions one or more of the gradation types specified in Standard Specification Item 334, for optimum density mixtures or of the open mixture gradations shown below. Design the mixtures to be produced with Item 334, gradation in accordance with Tex-204-F, and the asphalt content selected to result in laboratory density as follows. Table 8 Density (Percent) Minimum Maximum Optimum For mixtures to be produced with Gradation I, II, or III below, the Engineer will select the asphalt content within the range specified under Asphalt Content, below. Table 9 Percent Passing (by Weight) Sieve Size Gradation I Gradation II Gradation III 3/4" 100 1/2" /8" No No No No No AC %* *Allowed asphalt content range C. Resistance to Water Damage. The as-received mix will be evaluated for resistance to water damage by soaking a 100-g representative sample of the total mixture in 200 ml Min Max 2.0 TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

8 (7 fl. oz.) of distilled or de-ionized water at 60 ±1 C (140 ±2 F) for 24 ±2 hours. The soaking test is performed in a glass beaker of approximately 400-ml (14 fl. oz.). Upon completion of the 24-hour soaking period, the mixture will be evaluated while submerged in the testing water. The material shall show no visible evidence of stripping Mixture Preparation. Provide a plant mixed mixture. Furnish all production equipment that meets the requirements of Standard Specification, Item 334. Heat the asphaltic material in accordance with Article When SCM I or SCM II is specified, apply SCM I and SCM II at 77 to 93 C (170 to 200 F), unless otherwise specified by the material supplier. When AES-300S and CMA is specified, apply AES-300S and CMA at the temperature specified by the material supplier. Unless otherwise approved by the Engineer, mix the aggregate with bituminous material at temperature not exceeding 93 C (200 F). Discharge the bituminous mixture at temperature not exceeding 93 C (200 F) at the point of discharge from the mixer unless otherwise approved by the Engineer. Mix the aggregate and bituminous material until all of the aggregate is uniformly coated Sampling and Testing. The District will sample and test asphaltic concrete patching material at the time of stockpile or delivery to the project site. Failing material will be rejected. The Department reserves the right to conduct random sampling of materials for testing. Department representatives may sample material from the manufacturing plant, the project site, and the stockpile. CST/M&P reserves the right to test samples to verify compliance with THIS Specification. The Department tests will govern in all circumstances. Costs of testing and sampling are normally borne by the Department. However, the costs of sampling and testing materials failing to conform to the requirements of this Specification are be borne by the contractor or supplier. Costs of sampling and testing failing material will be assessed at the rate established by the Director or CST/M&P and in effect at the time of testing Archived Versions. Archived versions are available. TEXAS DEPARTMENT OF TRANSPORTATION /04 04/10

DMS-9202, Asphaltic Concrete Patching Material (Stockpile Storage)

DMS-9202, Asphaltic Concrete Patching Material (Stockpile Storage) Overview Effective Date: July 1999 July 2004 This specification shall govern for an asphaltic concrete mixture intended primarily as a cool to cold weather stockpile patching mix for maintenance. It shall