OKLAHOMA DEPARTMENT OF TRANSPORTATION SPECIAL PROVISIONS FOR PLANT MIX BITUMINOUS BASES AND SURFACES

Transcription

1 708-18(-e)99 OKLAHOMA DEPARTMENT OF TRANSPORTATION SPECIAL PROVISIONS FOR PLANT MIX BITUMINOUS BASES AND SURFACES These Specil Provisions revise, mend nd where in conflict, supersede pplicble sections of the 1999 Stndrd Specifictions for Highwy Construction, English nd Metric, s pplicble. Units of mesurement re provided in the subsections in both Englis h nd Metric equivlents. The units pplicble for this project will be those specified in the project plns MINERAL AGGREGATE. (Add SMA column in Tble 1 s follows:) TABLE 1 PHYSICAL PROPERTIES OF AGGREGATES Test SMA L.A Abrsion, % wer, mximum 30 Snd Equivlent(b), % minimum 50 Mechniclly Frctured Fces b c j, % minimum 100/95 Aggregte Durbility Index, minimum 40 Insoluble Residue d e, % minimum 40 Micro-Devl, % wer, mximum 25 Flt nd Elongted Pieces c f, % mximum 10 Nturl Snd nd Grvel b, % mximum 0 Cly Blls nd Frible Prticles g, % mximum 0 Soft Prticles, % mximum 5 Sticks or Roots, % mximum 0 Applies to ech source except s noted. b Applies to the combined ggregte except s noted. c Applies to the ggregte retined on the No.4 (4.75mm) sieve. d Applies to the combined corse ggregte. e Applies to the corse ggregte used in the surfce course. Does not pply to shoulders nd temporry detours. f Flt nd elongted prticles hve rtio of length to thickness greter thn 5:1.

2 g h i (b) 04 Applies to the combined ggregte. Provided the mximum for the combined ggregte is not exceeded, mximum 1.5 percent will be llowed for ny one source. In the requirement formt xx/yy, xx denotes the percentge of corse ggregte requiring one frctured fce nd yy denotes the percentge of corse ggregte requiring 2 frctured fces. Regrdless of the ctul design life of the rodwy, the design ESALs re bsed on 20 yers. () Corse Aggregte. (Add the following:) The corse ggregte for SMA shll be tht prt of the ggregte retined on the No.8 (2.36mm) sieve nd shll consist of clen, tough, durble prticles. (b) Fine Aggregte. (Add the following:) Fine ggregte for SMA shll be tht prt of the ggregte pssing the No. 8 (2.36mm) sieve nd shll consist of hrd, durble crushed stone, stone dust, crushed grvel, or mine cht or ny combintion of these mterils COMPOSITION OF MIXTURES. (Chnge s follows:) () As phlt Mix Design nd Initil Job-Mix Formul. The SMA mix design nd initil job-mix formul re the responsibility of the Contrctor nd shll be submitted to the Mterils Division for review. The review of the proposed mix design will be to determine tht the mix meets the design criteri. The Contrctor shll furnish one mix design for ech specific SMA mixture listed on the plns or in the Contrct. The mix design shll be prepred in n pproved lbortory of the Contrctor s choice. A request for lbortory pprovl my be mde either by Contrctor or Lbortory. Approvl will be ccording to the Mterils Division Policy for Asphlt Mix Design Lbortories. Mix designs will not be pproved for use until the Contrctor submits n cceptnce letter stting cceptnce sttus, project number nd mix design designtion, or signs nd returns the mix design to the Mterils Engineer. The initil job-mix formul shll meet the requirements of tbles 5E nd 6E. The contrctor shll prepre tril mixture. The tril mixture, prepred t the initil job-mix formul proportions, must meet the requirements for the following properties: grdtion, AC content, ir voids, nd VMA. If the tril mixture fils to meet ny of the requirements, the Contrctor my propose chnges to the job-mix formul. If the chnges result in mixture meeting these Specifictions, the job-mix formul will be djusted ccordingly. The job-mix formul shll estblish single percentge of ggregte pssing ech required sieve, single percentge of sphlt to be contined in the mixture, nd single temperture of the mixture t point of dischrge from the plnt. The job-mix formul with the llowble tolernces shown in Tble 7 shll estblish the Specifiction limits for ech mixture. These limits my be outside the brod rnge in Tble 5E except for the bsolute mximum sieve size. (3/4" Sieve for SMA.)

3 708-18(c) 04 (c) Recycled Bituminous Pvements. (Delete nd replce s follows:) No reclimed sphlt pvement shll be used in SMA. TABLE 5E SMA MIXTURE GRADATION AND BINDER CRITERIA ( Percent Pssing) 3/4" (19.0mm) 100 1/2" (12.5mm) /8" (9.5mm) No. 4 (4.75mm) No. 8 (2.36mm) No. 200 (0.075mm) 8-12 Binder Content, % of mix weight 6.0 min. Performnce Grde of Binder PG OK Cellulose Fiber Content, % of mix weight 0.3 b Minimum binder content my be lowered with Engineer s pprovl for SMA mixes with combined ggregte bulk specific grvity over Cellulose fiber content my be incresed to 0.4% if needed to control drindown. TABLE 6E PROPERTIES OF LABORATORY MOLDED SPECIMENS Mixture Property SMA Design Requirements SMA Field Requirements VMA, min. % Air Voids, % b ± 1.2 Tensile Strength Rtio (TSR), min Drin-down, % < 0.20 < 0.20 Permebility, cm/s x 10-5, mx APA Rut Depth, mm, mx. 3 - VMA of the mix is clculted using the following eqution: VMA = 100 ( G / G ) P mb sb s where: G mb = bulk specific grvity of the compcted mixture (OHD L-14) G sb = bulk specific grvity of the totl ggregte P s = percent of ggregte in the mixture

4 708-18(d) 04 Air Voids re clculted from lb-molded specimens compcted to N=50 gyrtions with the Superpve Gyrtory Compctor (SGC) TOLERANCES. (Add SMA column to Tble 7:) TABLE 7 RANGE OF TOLERANCES FOR SMA MIXTURES Sieve Size Percent Pssing No.4 (4.75mm) & lrger ± 7 No.8 (2.36mm) ± 5 No.16 (1.18mm) ± 4 No.30 (0.60mm) ± 4 No.50 (0.30mm) ± 4 No.100 (0.15mm) ± 3 No.200 (0.075mm) ± 2 Asphlt Cement ± 0.4 Temp. of mix s dischrged from mixer, F ( C) ± 20 (± 10) The tolernce shown for sphlt content is for individul smples. The verge sphlt content by OHD L-26 shll be within ± 0.2 percent of the job-mix formul SAMPLING AND TESTING FOR SMA. () Methods. Smpling nd testing shll be done in ccordnce with AASHTO methods, except s noted below: 1. Smpling nd Testing Aggregtes: Smpling T 2 Sieve Anlysis T 27 Mteril Pssing No.200 (0.075 mm) Sieve T 11 Bulk Density nd Voids in Aggregte T 19 Los Angeles Abrsion T 96 Mud, Cly Blls, Snd Clusters, Sticks nd Roots, Retined on No. 4 (4.75 mm) Sieve OHD L9 Frctured Fces OHD L-18 Flt or Elongted Prticles in Corse Aggregte ASTM D4791 Snd Equivlent (Cly Content) T 176 Aggregte Durbility Index T 210

5 Insoluble Residue OHD L-25 Soft Prticles OHD L (e) Smpling nd Testing Bituminous Mixtures: Mechnicl Anlysis of Extrcted Aggregte T 30 Smpling T 168 Bitumen Content OHD L-26 Mximum Specific Grvity of Bituminous Pving Mixtures T 209 Preprtion nd Density of Hot Mix Asphlt Specimens by SHRP Gyrtory Compctor b c T 312 Determintion of Drindown Chrcteristics In Uncompcted Asphlt Mixtures T 305 Determining the Specific Grvity nd Unit Weight of Compcted Bituminous Mixtures OHD L-14 Resistnce of Compcted Bituminous Mixture to Moisture Induced Dmge d T 283 Designing Stone Mtrix Asphlt (SMA) PP 41 The smple size of compcted bituminous pvement shll be in ccordnce with T 168. b All reported vlues shll be the verge of 2 specimens. d Design mixtures shll be mixed t 325 F (163 C), ged t 300 F (149 C) for minimum of 2 hours nd mximum of 4 hours, nd compcted t 300 F (149 C). Field smples shll be compcted t 300 F(149 C). No ging period is required for field smples, but they should be heted for minimum of 2 hours to completely dry the smple nd to ensure tht the smple hs stbilized t 300 F(149 C). e AASHTO T 283 shll be run on 150mm dimeter specimens compcted by the Superpve Gyrtory Compctor to n pproximte height of 95mm. 3. Testing Asphlt Mterils Performnce Grded Asphlt Binder M 320 Accelerted Aging of Asphlt Binder Using Pressure Aging Vessel R 28 Creep Stiffness by Bending Bem Rheometer T 313 Rheologicl Properties by Dynmic Sher Rheometer T 315 Grding or Verifying Asphlt Binder R 29 Solubility in Trichloroethylene T 44 Flsh nd Fire Points by Clevelnd Open Cup T 48 Wter T 55 Rolling Thin Film Oven Test T 240 Specific Grvity by Pycnometer T 228