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Distribution authorized to U.S. Gov't. agencies and their contractors; Administrative/Operational Use; 01 MAY 1966. Other requests shall be referred to Corps of Engineers, Vicksburg, MS.

USAEWES ltr dtd 24 Jan 1972

'^1'

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ill ! '1

I , ' í:¡ i ,,

PfELo||lll il illi Hii dipÉlii '1 RUN\||^|¡! # ;ÍE SURFACED j|||l

StfeÉL LANDING |Ü HI I i|

¡I j!pl|pi|l i Wiw PN' HI..

j|||||J¡:jjj^

¡IIIHIé'

MRCIUlANMOUS WAI'iai MIO, *i4iili'

DEVELOPMENT OF CBR DESIGN CURVES

FOR RUNWAYS TO BE SURFACED WITH

MISAI (FORMERLY TIO) STEEL LANDING MAT

't*Y

C 10. Illiuw«

W- 111 Wrnm

Ml «mir lim

S|NWNW»M«Hï|! It

Ut St Army Mtlitirî«! C^wirtdH

Pmlmâ: Hlo, t*V*0*2l70l*A-CM

CtwIwtoMW ll^i

Ut Si., Army llii|liitir Wi»4*rwifii Cxpadlmwnl Slnlion

CO«K 01= ENGINEERS

IpIWpTia i^Mplééip MWiMM N'NHi'HImmHwHH*, M##I

I« mhUMt ta iptíliiilii «prt «itifio«# «n iir»Miinimiil t» il* «ilr iinttÉ iiljM* if# Il lull «li ip iplM 4»t (||pi* iiitiwtifiii piè*IHiKit HMIoiti.

i

tmf nt iwt; nm $wœidi«, and WAID lIAM"

fct .|rl4l4|w|i|,|w|

jj'N ! fift&fcittipiiWi ! ipif the KBA3. itwail iduMtltni: Mini iwiMt lilt IttlliMia a|Wi ¡4 MÄ'Wre Ihtul^Bd la, Corps of fiD^inÉÉfft

WfcèiüliiMttf1 ivAriíoiiiÉ fmiwM O'if Willil, n|Í|iU| m%

Ä l(!)i:itt|-|| i'M'lll |W |l||j^ ÄiciUntott« iM^iio, iíkttiMl pf (D.lita t»,.

Mu mm i b|p4^i ti!)» lljL1 |||i|¡wl itfelwÄteir ¡up !t|ii Pai! lilt1 ! !|i!r|l#äi|;:pBiiB iWiIIIM1 liiliiíiMnilí'Mittict

*p. ;ÍI»ÍiA»;|y||Íi; i¡|w»^ «tó4 'Waatti 4lHi«Mi4n«i* éié! imalis

rit!U.«r Irnm tel» » wüitfc. tvltmu u 90 mU «iiï Ittwifl«* 10,f i cMqMctwl un m.â «min 4 ¡ricDir |ii# of mn

lift, Alter tHe fotirfcHi «twl ifto«.]|. 1,:111, mt muâ iwi^pdtteeid, tin« eimrfertie of tbt iiiliip¡|Wlt ms :it!‘ijt|#i-lttlMe| to gtamia 'with ä mot or pitirol, in*

iiiiitint Cil: %*$,%$ were tíwtüctmt lift WiiaitüteHir «wfitn# nüiâoneemt

t» BiiwttrB Wsirt: propor «iftpnMle etrewgtto, nere kefcng ctoitmiwai,, fum entine: eiubgiMMle mm to« ítrfeoed with tlhe mu wat, (moi« ttgí| |)#

IJ| t3Qj:lÂI,| Uto'11 #1001101, «Iftiir #' Mlliii ;|iW4Ím: «

ftWlt..

,1,:.(1::,, ItfeliflÜ mi» e.||fl,ili#i to :itoe .lltâl mot 'ipiih « i|>ei<tli«ül. ttit load

\t%%» III*: íNt'ioiwl owfi; ei:wn»:i#f,«4 ouf ,1# tmm wittii, tiwo cwitiriiipÈir ^1111^,11,,1 »IM, » J,tM»4 IW: iKHMttiMi, iinwdift# to# ÄimiHi «ni ma toiendi lif ,i, Ovpet Cl

®'wn*a*®w|'4 4 IBÍ^pIr 'mm <BliK!l<*1 tUf# '»» '«»»Nil ito the

Äii'S* k, Ittit lottid «art fililí iiinijli« .nujtiât-fiA/ptiàèí load, box

KK>«-.j !tt%; iiwd 3#4-p| tit«! tipöiffiü. tifirts. -»mi .« ag,®*.®!# 3ß*piy

latilftltl tlwai mm ttittli ii til* 6ô«ptl tit». pNiWiift 'fcrt.ffto t*«t. Flue ft!«

Xchrtüîii: ÄttitlOöi 8Ï»w til* ar*iliit:lcttifli IPÆ«#» ifi^ pwastjr*,* mâ am-

li44*J mmt

lIlM,;,

a%«» aiiCtto .a||H

M;l|áb0¡

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fim infitfctiott ftíeisniWB

,100 eW' 3«

6o 1« too 300

fl.r* Oaitiiet íurei

. ftt^i ti»,.

¡lM m 004, 31® Bl?0 I10T

âmiîifitgie OkMitiiMst ftroaaiur«

100, 173 ¢03

60' ¡1314 185 câr

l6„ Im addition "’-o onher data,, table S auaramrizea the rea alts

■afiílc teats and the behavior of the various test sections under

The general behavior of the. su1:i.grade and mat is c

StúbjRxaãe

17» As otated prcvloasly, a heavy clay material was used in con

structing the test sections, Par the low-strength sections, the clay wus

;ed at water contents of 26 to 28 percent, which is well on the wet

MHi-STÏ)-621 CE-55 optimum, to dry densities of about 95 lb per eu

:);.!•! resulted in CBR values of about 4 to 6, Por the medium-strength

s> the day was compacted at water contents of 23 to 25 percent,

10 on the wet, side of ICÖj-STD-öSl, CE™ ;¡5 optibiMin, to dry densities

coiiir|:)'i!i c

side o:’

ft,, T

sect loi:

wM.eh

froffi table

1::0 11. were used in the ..at«. Tee

'■te the algnificance of the adc caused by an ...

15 hiiirt'e been aie:

brea a on the nti

:: t: 50,000 lb, it cai! -.^'eaae in load from 25,uia.

1 that test 5 ..id a 300.pai tire Iou.ded to 25,(:00 ... w

!:.i-<ll:iEï subgrade and that test 15 involved a 300-psl tire loaded to 50,,000 Jb

°n a 10-CBH subgrade. Photograph 1 shows the mat in test 5 after 76 cov.

era«e8» a,!ld Photograph 2 show! the nat in test 15 after 66 coverages. Thesi

photographs show that -;;he 150,000...11:, load caused considerably more mat and

j-iubgrade damage than the 25,000-lb load, in spite of the fact that the sub-

grade under the 50,000-1¾ load was twice as strong as that under tin2 25,000--1¾ load „

¿.o. I'he MdiU mat performed satisfactorily on sections where

•ea were not severe enough to cau the load

in. teat 15 ’ai.led a;ti 400 ■«

(JO0 pslj it failed, at 66 coireragoa. It la appas?'.at fpow. those data arid

from afrailar comparisons of data la liable l that an Increase in tire

pressure will substantially reduce the number of traffic c-werages that cam lie applied before i'ailure occurs,.

iaiiixiMi mmU

S'! ji!||i:|f‘l| ||| tíéâjt|!!i:|||||y! ||y|i j||y|d on IM |b|¿is. öif axces-

illllf If IniWI ^IpSÎIfÿ :l:¡! i4l'ÍlfN|Í ï"» ¿11 milt to ’the point q;:f

||j mmm .¾ ..wax, tjiiïài liq. oi:>iad:il.:t:ÍD¡na occurred W tiie iiiphJ ti;W|:EÖ,a lunii te J. tiliitili. i.Bi ilV ;ljè tirulbgraiinï

iffM É^F3'®1'68!* mêm ip ! »ííôâtóêe <!l.e:irciwiiirli;;iciin in, !b]||¿ the mat started breaking Bit a. rapid rate. Photographs 6, 7, and

view» of test sections both prior to and after failure, tó¬

ele formation and deflection of the mats before mid after

..lection curves in photograph) 6-Ö were obtElued with the

f the 'tiraific

ri

h e

taraffic lane. In gen-*

ivelcrped under the

tuiader the load «k1

ion plots aiii

i tealu in the deforma-

* ¡LOENÖ:!« OF DESOT

i

23 , The method us,etil, to prepare deiitign. eux'vea for runwaya stirfii-eec

'iiibJii. M3a1 iismdiniK nw-t was s Irai lar to that uaed previously for other types

uii. mat. The haaio CE1R ctesígôi ciíHTiiííís :l:'l,e}i:ibiLe pavements '(cere' used as

ia behavior pattern.;, and from the data 'Obtained in the teats just described,

a determination was made as to the equivalent thickness of" pavement that

wan replaced by tins ..1.e,nd:Lng mat;,, CUE design curves for ruriwiayu ¡•lurfa.ced

the total thicknesa require- m3a

ments of

nesa pro

rnat were then prepared by reducing

■idee

"basic flexible pavement design curves by the equivalent thick-

. by the mat.

;o:riea of thcater-of-

usage of 'fche field.

value obtained f:-01:111 the almw #•.

lBe c0lirailiil and pavement construction that hmXb

the load for a ®lven of coverages on a eubgrade :,:n t:hie caae of the landUng mat, the t value indteat

C0Ura ' m(L flexil)le comtructlon ...placed by the :nmt touching tabulation shows the Indicated thickness reductions for the re- spective tire presstires as taken from piste 7.

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