ETC 1250 Lesson 03c - Lesson #30 _ ETC1250 - Properties of...

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Unformatted text preview: Lesson #30 _ ETC1250 - Properties of Materials Asphalt TeStan Various tests the tests performed on asphalt measure: — Chapter #3 Consistency — Pgs 94 - 109 Durability Rate of hardening Serviceability Ability to be effective in hostile environments Asphalt Testing — Asphalt Cements Asphalt Testing — Asphalt Cements - Penetration Test - Viscosity Test — Measure of the hardness of the asphalt _ Either Saybolt — At 77°F measure depth of penetration of 100g needle (Same as motor — Range = hardest at 40-50 [4.0-5.0mm penetration) on) at 135 °F softest at 200-300 (20.0-30.0mm penetration) _ Time required for ,,,,,,,, W 60ml to flow PENETRAIIONIIN UNITS OF 0.1 MM. through orifice 100 G ’ ’ ’ ’ ” - Or Kinematic at 275°F - Times recorded are ASPHAU CEMENT . n a 333;; of 5RHMT. 9.5.8. AFIEE 5 SEC. Asphalt Testing — Asphalt Cements Asphalt Testing — Asphalt Cements - - Thin Film Oven Test .~ . I F” ' FlaSh POIHt TBSt l — Looking for no change in T Safety TEST consistency when heated to 325 “F . .- _- -- and cooled _ Cleve'and Open- I ’6’ i — Important for crack filling Cup Test . . - Slowly temperature appllcatlons is raised while open --- flame Is passed - '. a above a . . . _ l t . — Good Ductlllty = Good CoheSIon _ PenskyMamns Test — Important for paving applications Sam leis stirred in .. ' .. closejd container " _ - ' SOIUbIIIty Test - Produces lower - _ vales than Open_Cup 5 . Test. percentage of actual-asphalt " ' by dissolylng In Carbon Dlsulflde Asphalt Testing — Liquid Asphalt - Kinematic Viscosity Test — RC-30 to 70 can be poured at room temperature — FRO-200 to 300 is the highest penetration grade — RC-3000 is moderately less viscous than 200-300 - Flash Point Test — Safety Test Asphalt Testing —Emu|sions - Saybolt Viscosity Test — Tested at 77 °F and 122°F - Distillation Test — Tests the solvent’s (waters) ability to separate - Settlement Test 1 “L E . — Detects Asphalt’s Eu'fiLSIFIED tendency to drop out of suspension Asphalt Testing — Emulsions - Particle Charge Test (for R8 & M8) — Anionic (-) Asphalts work best with limes — Cationic (+) Asphalts work best with silicious aggregates and wet aggregates - AcidityfAlkalinity (pH) Test (for SS) — Used in place of Particle Charge Test - Oil Distillate Test (for R8 & MS) — Oil Distillate is an impurity that is limited by specification Asphalt Testing — Liquid Asphalt - Distillation Test — Tests the solvent’s ability to separate from the asphalt ' Water T651 ‘ CUTCK — Asphalt is mixed with a high boiling point petroleum then boiled to determine the percentage volume of water Asphalt Testing — Emulsions - Sieve Test — Detects particles of suspended Asphalt largerthan a #20 sieve (0035") - Demulsibility Test (RS & MS) and Cement Mixing Test (88) — Determine rate at which Emulsion breaks (hardens) when mixed with aggregates or Portland Cement - Coating Ability and Water Resistance Test — Coat an aggregate thoroughly — Withstand mixing action while remaining as a film on the aggregate — Resist the washing action of water after mixing is completed Asphalt Testing — Blown Asphalt Softening Point Test Measurement of consistency for Blown-Asphalts Penetration Test At 32, 7?, and 115°F measure depth of penetration of various needles Loss on Heating Test Similar to Thin Film Oven Test Looking for no change in consistency when heated to 325 “F and cooled Temperature and Viscosity Temperature and Viscosity - Viscosity of Asphalt during , construction operations - Based upon temperature- such as_Sprayi_ng and - viscosity curves Mlen . B or Prlme - Temperatures are Im D0 ance regulated to produce However, the . i I asphalt mixes with the Tem perature-Viscosity . . . relationship of Asphalts same m'x'ng and handl'ng varies from refinery to -' r "' _ ' Characteristics refinery 3 t. - Important during: Thus, it is important to — the production of the know the Temperature— - asphalt °°ncrete . Viscosity curves for each . . . _ .. ' the '33“ down Operat'ons Asphalt that you use Asphalt Pavements Determining Pavement Thickness FAVIMM TIICKHE“ '0! Dlmlfi POI flilwl Chl$ The basic requirements for an asphalt pavement are: . """'5-'-'°-”5"—"‘-”,i-,',',:,"' . . . l‘—' .. a... 1. HavesuffiCIent total thickness and internal I J... _ am. .e. ,r hm! Salon I...) strength to carry expected trafficloads; " " ’ {fr-con" |ool nil».~up|ml« - 2-: 0.3‘ m4 Sch <on film plum 4..- -m _ I a... La. ‘4... ' " Prevent the penetration or internal accumulation 11:2:sz ' IMva-d fimmlqulmrnu-‘q iv. thlwmdl‘l Malia-lullaby- uhullllr-IINJMM of moisture; and _;;‘r ( “m.”c;c':::':r’:.a“‘"‘“”“ on um arm—.- mm 5m... ...ogu. nub... . Inn—Ian I... rlflLlRE 3-1! Shag... M pavement (rich-Ives lu' talking illl‘flfi :Inr. mvrwmys nature->5- F-‘Ir isu'im.‘ mun-urn.- Have a top surface is smooth and resistant to The factors that should be considered when designing an asphalt wear, distortion, skidding, and deterioration by pavement 3’93 weather and de-icing chemicals. 1. Tra‘fic to be served 1. initially and 2. over the design life ofthe pavement 2. Strength and other pertinent properties of the prepared subgrade Determining Pavement Thickness Design in Detail FAVIMM THEE-NE“ '0. DINA" Fol Flilwl CAIS YII‘III“ IIGURKNI‘HI! . lit!“ _ _' ' "' mm, — -* Traffic to be served initially and overthe design life ofthe WIFMZI UMG small INIIMJ -_. _ .wnwm nun-M pavement rum: awn (mu find-uh (n..- Ilka-a... rel WeightandVolume 5:4,-» w Dandy ms. «in drum-Id -‘ .7- m..le,c....u_...fl._a . ' ' _ -- to; Subgrade Evaluation — H—-——-——_-_'"°"“"""m'" ' ' ' " "’"m Field loading Tests 'h—mmdunl'fdu seesaw“..- Laboratory Loading Tests mun-www.mmunim "mm. Mum-ammm-‘wnu-uun uhmllurmJHh - ' ' ' umflzflywm um.::;_.l.,;:r-ammm-~ Evaluation based on Classification of scil “'Y-olxhidxwuundnim a—gpmmhmmflhlumnme-‘m FIGURE 3-1! 9.53an Da-fl‘wnl truths» lu‘ ram-lg iIH‘NK mr mvrw-Iys future->5- f-‘Ir visu'im.‘ mere-ma.- The factors that should be considered when engineering an asphalt pavement are . Strength and other influencing characteristics forthe layers or courses in the total asphalt pavement structure . Any special factors peculiar to the road being designed Design in Detail Asphalt Mix - Sufficient asphalt to ensure a durable pavement Sufficient mix stability to satisfy the demands of traffic without distortion or displacement Sufficient voids in the total compacted mix to allow for a slight amount of additional compaction under traffic loading without flushing. bleeding and loss of stability. yet low enough to Keep out harmful air and moisture Sufficient workability to permit efficient placement of the mix Assignment - Page 149 Review Questions 9, 10, & 16 If you do not understand a question, email me at tomlinm©phcoedu orthrough myPHCCedu ...
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This note was uploaded on 01/05/2011 for the course DRAFTING A ETC 1250 taught by Professor Tomlinson during the Spring '10 term at Pasco-Hernando Community College.

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ETC 1250 Lesson 03c - Lesson #30 _ ETC1250 - Properties of...

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