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B1 APPENDIX B ON-BOARD SOUND INTENSITY RESULTS TABLE OF CONTENTS ON-BOARD SOUND INTENSITY DISCUSSION ................................................................B2
One-third five PCC for the d NC10, an (Sites NC Appendix level at 1 for the 5 NB1 leve Figure B sites The one- shown in somewha been asso range, th different. at 400 a Appendix porous gr below 1,0 octave ban pavements ifferent pav d NC11 ha 1 through A) and low ,000 Hz and 05 NB1 is ty ls are 2 to 5 1: One-thir third octave Figure B2 t porous. Th ciated with e OBSI leve For 505 S nd 500 Hz A), the 50 ound PCC, 00 Hz. ON-BOAR d spectra fo measured a ements are ve lower le NC3), Site est levels below is g pically with dB higher. d octave ba band spect . For both e spectra in porous pav ls at 505 S B2, the leve where 505 5 SB2 surfa which is lik D SOUND r the groun t 60 mph in somewhat vels below NC3 has the below 800 H reater than t in about 1 nd on-board ra for the O OGAC site dicate a slig ement in pr B1 and 505 ls are typica SB1 is slig ce appears ely contribu B2 INTENSIT d PCC pave North Caro similar; alth 2,500 hertz least amou z. Site NC hat of Site N dB of the S sound inte GAC pavem s, there is s ht âdipâ in t evious resea SB2 have lly higher t htly higher to have mor ting to the h Y DISCUS ment in No lina are sho ough, the g (Hz). For th nt of visua 2 has the g C1. From 8 ite NC10 le nsity level P ent sites f ome indica he 1,600 an rch. Throug a similar sh han 505 SB . From the e positive s igher level SION rthern Calif wn in Figur round PCC e transvers l texture (se reatest visua 00 Hz and vels. Below CC pavem rom Northe tion that th d 2,000 Hz hout much ape; althoug 1 by about 3 pavement p urface textu s for the OG ornia and fo e B1. The sh Sites 505 e tine pavem e Figure A l texture, b above, the l 800 Hz, the ent measure rn Californi e pavement bands, whic of the frequ h, the level to 5 dB, ex hotographs re than the AC in the b r the apes NB1, ents 14 in ut its evels 505 ment a are s are h has ency s are cept (see non- ands
 Figure B sites The DGA NC4, NC B3. Whil pavemen were 3 to At the 40 somewha indication produced Super pa asphalt s other No The aged beamform B4. Whil results fr than in 2 pavemen comparis Degradat lost from 2: One-third C paveme 5, NC6, NC e the DGAC t at the Lak 7 dB highe 0 and 500 t compared of this beh the lowest ve mix surfa urface treatm rth Carolina Lakeville ing work, e a slight d om 2007 do 007. As in t has degra on, most o ion in this r the surface octave ban nts tested in 7, NC9, N pavements eville site v r than all th Hz frequen to the rest avior. Of th levels. NC ce course w ent which Nova Chip DGAC pa and a comp ip at 1,600 not indicate dicated by t ded over th f this degra ange is typi , leaving a d on-board Northern C12, NC13, in North C aried. The e North Car cy bands, th of the spe e North Car 4 and NC5 ith a 9.5mm for this pa surface (refe vement was arison of th and 2,000 H the dip; ho he overall e nearly se dation has cally associ higher perc B3 sound inten California ( NC15, and arolina had levels for th olina sites a e spectra fo ctral traces. olina pavem were identi maximum vement had r to Figures also meas e 2007 and z indicates wever, the l level differe ven years b occurred in ated with ra entage of la sity level O Lakeville) a NC16) at 6 similar spec e Lakeville t frequency r the North However, ents, those fied at S9.5 aggregate si visibly sma A14 and A ured in 20 2013 measu porosity in evels in thes nce of 3.9 etween the the bands veling of th rger aggreg GAC pavem nd in North 0 mph are tral shapes, site in No bands at an Carolina s the Lakevil at Sites NC4 which is a ze. NC9 is ller aggreg 15 in Appen 07 as part rements is the 2013 m e bands are dB, the per studies. F from 1,250 e surface w ate. This in ent measure Carolina ( shown in F the older D rthern Calif d below 800 ites are flatt le site show , NC5, and type of As a Nova Chip ate size tha dix A. of the Cal shown in F easurements 1 to 2 dB h formance o rom the spe Hz and be hen aggreg creased po ment Sites igure GAC ornia Hz. ened s no NC9 phalt thin n the trans igure , the igher f the ctral low. ate is sitive
surface t frequenc data, whi the raveli Figure B sites Figure B site for 2 exture tend ies. At the v ch may be d ng. 3: One-third 4: Compari 007 and 201 s to affect ery high fre ue to some octave ban son of one- 3 the lower quencies ab relief of tire d on-board third octave B4 frequencies ove 3,150 H tread air-pu sound inten band OBSI to a grea z, the leve mping with sity level D spectra fo ter degree ls actually d more surfac GAC pavem r the Lakevi than the h rop in the r e void area ent measure lle measure igher ecent from ment ment
 For the N Sites NC the same are clear the level particular Site NC9 below, th pronounc higher th peak is re and NC9 reference element except th and not t which is smooth s aggregate peaks ge pavemen NC4 and the NC r pavemen Figure orth Carolin 6 and NC12 (see Figure ly different s for Site N ly at 1,000 and the ot e levels fo ed peak in an Site NC vealed mor . At 1,000 test tire (SR passage freq at the peaks he pavemen consistent w urface creat is exposed nerated by ts with the S NC5 are al odeo. Beca ts would em B5: Narrow a pavemen are consist s A14 and A from the oth C9 are low and 1,250 H her DGAC r Site NC4 the Sites NC 9, creating t e clearly in Hz, the Si TT) used in uency. For are lower t. Below 80 ith the eff ed by fine ag , causing a the tread pa ite NC9 pa so quite sim use of the phasize mor band on-bo ts, Sites NC ently lower 15 in Appe er DGAC p er than the z where the sites, Sites N and NC5 a 4 and NC5 he slightly the narrowb te NC5 dat the OBSI the sites, sp for Site NC 0 Hz, the lev ects of pave gregate in t n increase ttern. It is vement bein ilar to those fine texture e tread relat ard sound i B5 7, NC13, NC than these f ndix A). Th avement lo other DGA levels are a C4 and NC re consisten data at 1,0 higher over and spectra a shows a procedure, t ecific peak 9. These ser els for Site ment aging he mixture a in the lowe likely that g older. Th measured f of Sites N ed tire noise ntensity leve 15, and NC our sites, ev e spectra fo cations. Exc C sites for s much as 4 5 have un tly lower t 00 Hz, whic all levels fo comparison distinct nar his correspo s above abo ies of peak NC9 are gr . Typically, re worn aw r frequency Sites NC4, e one-third or the new C4 and NC in the mea l for measu 16 are alm en though th r Sites NC4 luding Site frequencies dB lower. ique spectra han the oth h extends 1 r Sites NC4 of Figure B row peak. F nds to the fu ut 800 Hz s are due to eater than th as a pavem ay, and the u levels and NC5, and N octave band S9.5 pavem 5, it is exp sured pass-b rement Sites ost identical ey look vis , NC5, and s NC4 and up to 3,150 In comparis . At 800 Hz ers, and the .5 to about and NC5. 5 for Sites or the stan ndamental align quite the tread d ose of Site N ent ages, i nderlying l a broadenin C9 are all spectra for ents measur ected that y levels. NC5 and N , and ually NC9 NC5, Hz, on to and re is 2 dB This NC5 dard tread well, esign C5, nitial arger g of S9.5 Sites ed in these C9
The one- While the is a simi PCC and lower tha surface r Site NC compared Californi 5 dB re respectiv higher le than the NCHRP Technolo pavemen Figure B measurem third octave spectra for larity in the Site NC14 n Site NC8 oughness (s 8 in produc to 35 mp a. The PSP ductions in ely. The pre vels below two NC site Project 1-44 gy (NCAT) ts, with a le 6: One-thir ent Sites N band spect Site NC14 spectra tha is DGAC p at every fr ee Figure A ing the tire h OBSI re data are bef heavy tru -overlay res 1,250 Hz. A s. In terms , five differ test track. T vel of 97.3 d d octave b C8 and NC1 ra for 35 mp is consistent t is somewh avement. W equency ba 15 in Appe noise. In sults measu ore and afte ck pass-by ults are sim bove 800 of overall le ent pavemen hese ranged BA measur and on-boa 4 B6 h at Sites N ly lower tha at unexpect ith the exce nd. Site NC ndix A), wh Figure B7, red on Poin r a quieter p levels for ilar to the S Hz, the pos vel, Sites N ts were mea from 90.4 t ed for an ol rd sound in C8 and NC n Site NC8 ed since Si ption of 630 14 does ap ich may ac these resu t San Pedr avement ov acceleratin ites NC8 an t-overlay le C8 and NC sured at the o 96 dBA f der PCC pav tensity leve 14 are show throughout te NC8 is tr Hz, Site N pear to hav t similar to lts in North o (PSP) R erlay, which g and crui d NC14 da vels are con 14 are relati National C or ement in a l at 35 mp n in Figur the spectra, ansversely C14 is 1 to e a conside the roughne Carolina oad in Nor produced 3 sing condit ta, except fo siderably h vely high. I enter for As nearby town h for low s e B6. there tined 2 dB rable ss of were thern and ions, r the igher n the phalt . peed
 Figure B measurem results fr 7: One-thir ent Sites N om Point Sa d octave b C8 and NC n Pedro Roa and on-boa 14, with com d B7 rd sound in parison to tensity leve pre- and po l at 35 mp st-quieter p h for low s avement ov peed erlay
