IOWA RESEARCH WITH

CHEM-CRETE TUMEN

FINAL REPORT IOWA HIGHWAY RESEARCH BOARD

PROJECT HR-226

I Highway Division Iowa Department of Transportation

Disclaimer

The opinions, findings, and conclusions expressed in this report are those of the authors and not necessarily those of Story County or the Iowa Department of Transportation

FINAL REPORT

IOWA HIGHWAY RESEARCH BOARD

PROJECT HR-226

- IOWA RESEARCH WITH CHEM-CRETE BITUMEN

Del Jespersen, P.E. S t o r y County Engineer

and Kev in B. Jones, P.E. O f f i c e o f M a t e r i a l s

Iowa Department o f T r a n s p o r t a t i o n Ames, Iowa

51 51239-1 382

TABLE OF CONTENTS

ACKNOWLEDGEMENTS

INTRODUCTION

OBJECTIVES

PROJECT DESCRIPTION

ASPHALT M I X DESIGNS

TEST SECTIONS

CONSTRUCTION

DISCUSSION

CONCLUSIONS

APPENDICES

A - , T e s t R e p o r t s . B - C o n t r a c t s

- S p e c i a l P r o v i s i o n s ) , j

C - A s p h a l t Cement T e s t D a t a

D - C r a c k S u r v e y

E - Road R a t e r D a t a

ACKNOWLEDGEMENTS

Research project HR-226 was sponsored by the Iowa Hiqhway

Research Board and the Iowa Department of Transportation. Funding

f o r t h i s project was from the Secondary Road Research Fund in the

amount of $34,830.

The authors wish t o extend appreciation to the Story County

Board of Supervisors and the Iowa DOT fo r the i r support i n the

evaluation of new technology. bfe also wish to thank M. R. Johnson

of Manatt's, Inc. fo r his cooperation on the project. Jim Grove

of St0r.y County and Steve Tritsch of the Iowa DOT were important

narticipants i n the development and construction of the project.

INTRODUCTION

With the spiraling cost of construction, coupled with inflation,

engineers must develop and research new techniques t o better u t i l i ze

the public's dollar. One area i n which these new technologies must be

researched i s in the f i e ld of highway construction; more specifically,

asphalt products.

There are areas w i t h i n the s t a t e of Iowa which do not have

Class I aggregate readily available for asphalt concrete road construc-

tion. The cost of transporting higher quality aggregate specified in

the "Standard Specifications for Highway and Bridge construction"' for

construction projects is escalating on a yearly basis. Many counties

will be squeezed out of the construction of new roadways i f an alterna-

t ive to the high costs i s not identified. The same high costs will

curtail adequate upkeep on the existing paved system and will result in

decreased serviceability. For th i s reason, a product i s needed to

better u t i l i ze the local aggregates for road construction and maintenance.

There i s a product on the market which the promoters claim will

improve the prer?nt asphalt to such a degree as to "upgrade deficient

aggregates" to the level they can be used in today's standard construc-

tion techniques. This product i s "Chem-Crete Bitumen," a'kpecially refined

asphalt" that was promoted by Chem-Crete Corporation of Menlo Park,

California. Chemkrete Technologies, Inc. of Wickliffe, Ohio; a wholly

owned subsidiary of the Lubrizol Corporation has since purchased the U.S.

1 "Standard Specifications for Highway and Bridge Construction", Iowa Department of Transportation, 1977.

patents of Chem-Crete. Chem-Crete was promoted as a product which

increases the s t ab i l i t y of asphalt mixes a t a l l temperatures, improves

durabil i ty and upgrades the fatigue response of present materials by

increasing the limiting s t ress and s t ra in .

OBJECTIVES

The primary objective of the research was t o determine i f Chem-

Crete Bitumen would provide significantly improved performance of the

mix designs used. The sec0ndar.y objective was t o determine i f a sa t i s -

factory asphalt concrete base could be made using a poorly graded sand.

PROJECT DESCRIPTION

Two roadways were selected i n Story County t o evaluate the per-

formance of Chem-Crete Bitumen. The projects a re a 1.046-mile section

of county road E-57 and a 2.400-mile section of the North Dakota Street

extension (Figure 1 ) . The existing roadbed of E-57 consisted of 2.5 inches of Type B

asphalt cement concrete over a 6-inch rolled stone base with a Cinch

soil-aaqregate subbase. The North Dakota Street extension roadbed

was 4.5 inches of emulsion treated base.

The t r a f f i c estimates are:

1980 ADT 2000 ADT Percent Trucks

E-57 160 200 20

North Dakota 600 1000 10

Figure 1 - Project Locations

STORY COUNTY IOWA

ASPHALT MIX DESIGNS

Chem-Crete was t o be blended 1:9 with an AC-10 asphal t cement

and mixed pr ior t o use. The bid p r i ce f o r a spha l t cement included

the cos t f o r supplying and blending the asphal t modifier. A hot sand

mix and a Type B Class 2 a spha l t i c concrete mix were desiqned f o r the

blend. Both mix desiqns were a l so specif ied f o r use with unmodified

a spha l t cement. The sand was from t h e Williams P i t i n Story County and

the gravel f o r the Type B mix was from t h e Peterson P i t i n Story County.

Appendix A contains the material t e s t repor ts .

TEST SECTIONS

On E-57, the sand mix and the Type B Class 2 a spha l t cement

concrete were placed i n two l i f t s f o r a t o t a l depth of 3 inches. .

The placements are:

Type 5 6% asphal t S ta . O+OO t o Sta . 32+75

Type B w/Chem-Crete 6% asphal t S ta . 33430 t o S ta . 44+00

Sand w/Chem-Crete 7% aspha l t S ta . 44+00 t o S ta . 55+22

The North Dakota S t r e e t extension i s a nominal 1 1/2-inch l i f t

of t h e sand m i x and Type B Class 2 asphal t cement concrete .

The placements are:

Sand w/Chem-Crete 6% asphal t Sta . 0+00 t o S ta . 29+50

Sta. 30+50 t o S ta . 90+00 L t . Side

Sta . 30+60 t o Sta. 69+70 R t . Side

Sand w/Chem-Crete 8% asphal t S ta . 29+50 to Sta. 30+50 L t . Side

Sta. 29+50 t o Sta. 30+60 R t . Side

Sand 6% asphal t Sta . 69+70 t o S ta . 90+20 R t . Side

Type 5 6% asphal t Sta . 90+00 t o Sta. 128+00 L t . Side

Sta. 90+20 t o Sta. 128+00 R t . Side

CONSTRUCTION

The const ruc t ion began September 15, 1980 and was completed

September 19, 1980. Iowa Road Bui lders Company was the contractor .

Copies of the cont rac ts and specia l prov is ions are i n Appendix B.

A Barber Green p l a n t i n Ames, Iowa was used t o batch mix the

asphalt concrete. Haul distances t o the pro jec ts were approximately

10 mi les t o E-57 and 6 m i l es t o the North Dakota St ree t extension.

The construct ion procedure was standard p rac t i ce w i t h the ex-

cept ion o f the r o l l i n g sequence. The ho t asphal t mix w i t h Chem-

Crete appeared t o r e t a i n the heat. The r o l l e r was held back from

the Blaw-Knox laydown machine t o a l l ow the asphal t t o cool t o prevent

the asphalt from creeping ahead o f the r o l l e r .

Average h igh a i r temperature during construct ion was 72O F

and the average low a i r temperature was 47O F. No measurable pre-

c i p i t a t i o n f e l l dur ing construct ion.

DISCUSSION

Test cores were d r i l l e d i n March and A p r i l 1981. The Iowa DOT

determined the penetrat ion and v i s c o s i t y on the extracted asphalts

(Appendix C). The t e s t revealed low penetrat ions f o r the asphalt w i t h

Chem-Crete from the sand mixes, however, penetrat ions f o r the asphal t

w i t h Chem-Crete from the Type B mix were close t o values obtained

from assurance samples. Test cores were sent t o the Chem-Crete Corp-

o ra t ion f o r analys is . The evaluat ion by the Chem-Crete Corporation

indicated a v a r i a t i o n i n treatment l eve l s . The Chem-Crete Corporation

a t t r i b u t e d the v a r i a t i o n t o inadequate mixing of the Chem-Crete a d d i t i v e

w i t h the AC-10. Nei ther the Iowa DOT nor Story County were informed

as t o the mixing time required.

I n October 1981, the Iowa DOT received a l e t t e r from Chem-Crete acknow-

ledging tha t the mixing time was probably no t the primary cause o f the

premature cracking.

A crack survey was completed during the f i r s t two weeks o f March

1981 on the two Chem-Crete pro jec ts . The Chem-Crete sections exh ib i ted

severe cracking wh i le the contro l sect ions d i d no t (Figures 2-4). Cracks

i n the Chem-Crete sect ions were as wide as 314 o f an inch. Appendix D

i s a summary o f the crack survey. The Chem-Crete Corporation t e s t i n g

ind ica ted t h a t the primary problem was inadequate t e n s i l e s t rength i n

t h e Chem-Crete sections.

The Iowa DOT Road Rater was used t o determine the r e l a t i v e strengths

o f the t e s t segments before and a f t e r cons t ruc t ion (Appendix E). The 1982

t e s t i n g ind ica ted lower de f lec t ions f o r the comparative Chem-Crete sections.

On E-57, the 80th pe rcen t i l e de f l ec t i on f o r the Type B mix w i t h Chem-Crete

was 3.3 m i l s and f o r the untreated Type B mix i t was 3.7 mi ls . S im i l a r

r e s u l t s were found between the t rea ted and untreated sand mix, however, on ly

l i m i t e d t e s t i n g was conducted on North Dakota S t ree t extension.

The severe cracking on the Chem-Crete sect ions requi red co r rec t i ve

a c t i o n i n 1982. North Dakota Street received a zeal coat and the cracks on

E-57 were sealed w i t h emulsion i n the summer o f 1982. Chem-Crete Corporation

funded the cos t o f the crack seal ing and seal coat ing. A seccnd seal coat

was placed on North Dakota St ree t i n 1983 t o co r rec t the e a r l i e r seal coat

which had experienced loss o f cover aggregate.

CONCLUSIONS

The fo l l ow ing conclusions can be stated:

1. Based on the comparative t e s t sect ions w i t h and wi thout the

asphalt modi f ier , i t can be concluded tha t Chem-Crete had

a very detr imental e f f e c t on the Type B mix used.

-7-

Severe cracking on the Chem-Crete section developed i n the

f i r s t year of service.

2. The asphalt concrete base mix using the Chem-Crete modifier

and poorly graded sand was unsatisfactory. Severe cracking

also developed in the f i r s t year of service.

3. The Chem-Crete sections will require substantial future

maintenance. The seal coat applied to North Dakota will

probably be inadequate and either overlay or removal will

be required much ea r l i e r than normal. In January 1984 the

crack f i l l i n g on E-57 also appears t o be inadequate and

further work will be required.

Figure 2

Crack extending into control section from sand Chem-Crete section.

-8 -

Crack in sand Chem-Crete section only.

Figure 4

Crack in Chem-Crete section.

-9-

Appendix A

Test Reports

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5 0 t-, NIJMBE:li I P1ARSI..IALL. EII..C)WS .> 0 5 i.) k l i l < l l l l , . S'l'AB:Lt..:['I'Y .- LNS, 21 '75 1 tj~.trj 1762 1" 1.. (3 W .- 0 .> 0 1 :X t,) , X Y -i .I c. I::, (- p .A . ~ t . BY I~:l:Si:~41..A!~1Si'llii:N'I'!LAB DkfN:i.i ") P 2 , , ? A. ' '7 *.! "" $3 2,34 1: 1 I..: I A C; I:< , i : kt R , 1) I'\' Y A (3 C? ,> ::! . 6'70 2 ,% h'70 2 . <,, .., . , fi,ypi..~, (g '7'7 r A .i ,028 1. 0 2 8 f ,028 !':A I.-;: A ,:<(:I I,.. :I: E ,:<!::: A !:;I:? a ,.> .<:. .> .4 (? x! A .44> 2,42 .... , ?, .." ' V!:i:[ :()S . - !::&)I,.(: f3 .\ 2 .> iir .D . 3 ..... , , I . . , (3 l:; A 2.47 .::? , 4 2 2.38 .. e, "(1) ;[ 1) y .... [i 11: (1: 1;;: ..., ;* . . 8. i ,L 3 A :7 ., 9 p; !,jA'r I.: I:;; (+B 'Ji:] 17 p 7' 1: .... &(jfiRk; [j ,?([ 1:: 6 .'73 .O '7'3

a 3. C)*73 % VI:!%I)S IN 'TI-.Ill!:. M:KNEF\'AI ... AI3GRE!';A'!::E!: l f l A 5 IEl.6 3 r I d ., '5 % v .> tl & ,$ : 1:::i. I ..l.,.l!:E ld:l:'!::il A~~l'~~l~~l#~I.,. '!:: ,? , .> <) A (3 '71 . 4 82,O I ........ I l l > ASI:'I..I . F I: I...M TI-II C:IINI::!;S ! M :I: C:I?!:!NS.j 7 . 0 13 . 6 .I 6 ,, 2 I: :I: l.,.L-l!i:l< / EI :I: .l'l,ikIlS?4 RA'r :I: !:I 1 . 1

4 : 1 y I : 5 : . I I . . .. : 1 : : 1 : : :I: s lil;;:!:: ~y,fil:;: NI)ED y (1 ST AR 'I' '~I..IE: ,.108,

(1; !:I p :I: 1:,y :

,. I 1 :J: X I)ES :I ON I,.. .... 1J '$ .... '1 $3 fi ........ '7"3 ...

<, 8!5, S'Ti:!F:Y 11:: <;i.,l;;:,;; . . ........ - > or4

p< . [..i{,jHl~'+lR~j:'i :I> A .,I (:!I::: E :i: ;;.'!:I Pi I:< " ;;:'..,I::[ ,:]I, 11: ;<'y a, . ." ,.,.. i.. . Z 1::: h I? I.,. 1:: Y I: h a 1:;: I!.; ,% :i:: I,..:!:) I::: :< A

!:: A .,S!:if.!k::;:

Appendix B

Contracts

Special Provisions

i,,,,,, ,4,,.,2,:, . t . I ! , ' CUNfKi\C'I'

i \ s i ~ : l t i l C i c Conr:. l i e : ~ u r f :IC~.I~~.J i l l 0 0 . . . . l.Olt4 h l i lcs

r u e . ..~-i~!i!.--~.~0=~23~n.s..~ ~ o u i , l ~ -.--------.-. s t o r y .-

S t u r y TlllS A(;I;i:EMYNl ri:;crli? arirl unlcrerl try a i r 1 lk~:l!vi:c.n Cotlilty, Iowa, I>), i ts l!l!.tni of S~~t:ervisors L;j*ry N,

coniii,!:tirr~: of tlic following rncnrbcrs: -- . . . . . . . . . . . . . . . . . . . . . . ............... . _. , parly o! !lie! l i rst p.111, ;~rat

D c l I.lr~i.no!;, Iobi;t ........... .... : . of -. - - , 11<irty of ~IIC $I:CI>I~<! part. r S . I : I imt iik 11nr1y of ihc sccond p.lrl, for a i ~d in cc~nsider,~tinn 01 ."~E~XJ~-.~~!OU~JI(~.K?!J! !..!2ic!!d;'E!.-__'

:inf: cirirl 8 3 / 1 0 0 r f31.83 3 . . . . . . . . . .. Dolliirs ($_.k,..i -) ~ n y a b i e ;;s sc!l fort11 in l ltc spccii icatior~s constiloiir!p: n part of l l i is co!tlr;tcf, lrcrcl~y .?!:ices l o curlsinlct in accortlil~icc with tire plaits ?ntl ~pt!cilicnlio119 tbercforct, a i t l in l11c loc;ltioi~s tlcsign.llc:tl in the noli1.c to bitldrrs, the various itetiis o i work as fnllows: _ ^ . . . ... . . . . . . ............... -. .. ............-.-....-..-........-----...........-...-.--..-----..............-.--.........-...--..-....-......-....--.-.-..-...-.----.--y...-------------

t!cr:l Nn. l l r l l t

f3ase, C l e a n i n g R P r o p o r a t i o n o f O l d S g e c i a l S a n d Mixt ! . rr i? P r i r t i a ~ . or 'Tack C o a t B i t u i t l e n Ease , Type B C l a s 3 2 A ~ p h . 1:oior-nt C o n c r e t e Aspl.ia1C .Cemt:nt Shou?.:Jors, G r a n u l a r S u r f a c i r i q o f P~( l l i ! i ; i : 1~ i l t fJavernent i 4 a r k i r t g

Quaattry

l.Of+f+ Mile

1,800 T o n s $ 1.6.56 1 4 8 T o l l s 9F14ls.37

89 ' i o ~ i a $ 20.00

I 131.42 S t a u $ 18.50 i

1 2 0 I S e p t e m b e r 2 9 , 19001 ih::t I I I , ~ ~ : i s t i i t . ......... nc.. <.I ,hi.; rn<,i!;!al ;iii,l i > ~ ; ~ l <,>ill < r l ~ l $ i l ~ f i : ( s l l / i l i ~ : i :ill (,I 11)0 t $ l l r s i . i illlll,~:llllllllilll~?. i a j ~ l ~ l o t l ' s l t l ~ l l 1.Y !!#I. 1 8 : i t l i l l : i 1>1!11110.

I; i s tuiti,r.z ~ , ~ . l ~ . t : ; \ o o t l mitt ilir? l;rcoi,tt I,;l,ry C L I ~ , . ; V ~ ~ to t l , i : i t l , i l i d i~~~o~ , ot t l ~ cnktnr OI tow;, R~ h<,sr, rlclr!tti,l~t~: :~ni i g~.r,iici ~ m ~ ~ ~ ~ ~ ~ : w i ~ n ar2y coi,~rove'r:i~ O,iSi,\<, ,,,.,,.,C!t.,C.,.

I <,,a: , ,4$,:,!t:l r I ! , CUNl'KACi

Annha l t i c Carrc, Ncsurf;lcirlrj Kisit of ~:r;,li .... ., .......... ... ......... _ .... Milt.\ ...................... . . . . . . . . . . . ..-. - 2.~100

proit:ct N!;. . . I I ~ I S>"?Y stor.\/ I ! A I I N I I : i r i I I b 1 1 1 . . . . COt~nly, IOiva, 11y i t s I;IGI>I r i r 5111;1>rvi;<tbr!:.

cn~rsisti~i,: ni tile followini: i n i ~ s ~ i ~ ~ , s : ~x?xJ.-~...!~!?X~.P~!, ..... k-?f?!!..':~-!!~~!?i"l?~? .... 2L%,-!.i,L!.j:.':!!!!!..!::. .??2?:!.!; . . .. irarlj. I!! tlir! lii!,i ii,:il, ,~ir; !

! . . . i , ~ . . ! . ....... 01 -~v.s.~~(!&.!!!J.ELL!~I~,~~ , party of tl:v :.r.ro:i<l ,i;lif.

.. ... WIINTSS:T!I: Tllal the party u i tic s c f ild ,rat, frir :!i~l in r!!:isid,!t;~ti~rn of .-r?ir~! l!l!!?d~u~i t!!~~i!?.tv~.r.hri:::. . ~ b ~ ~ ' ~ ~ ~ ~ r ~ ! ! ........... ' 7 ............... ...... twn . . l i ~~ i~d rd f mur ... arld_3Lt/I.fl.C n ~ l l i ? t s (s..%C.b, ?.I):: ..yi!r..- )

payahlc as hc!t fortli in 111c slrccific.arioi~s c~>i~st i lu i ia i ; ;I liar! n i t l r i r co;i;l;!rt, Itcrt!by aj:rt!cs to collstrticl ill ;rt.:i.or,l;~!ii.c ciili I!;;! pldns and spl!cifit:ariot~s [ltcreforc, atrd in ti~c! l o r~~ f i n r t s clcsrg~wie~l in tiie i?otice to hirIdi,is, i!tc vario~rs ilr~j~.; 01 \;tlrli as i n l l ~ ~ w s : - -- -. , ........- .. ............................. .............. ..................... ........ .......... ......... ........ -A- - -- - ..- .. ... .

Alliolllll .. ......... .- ..

3 r;m. GU $ OD,:',n7,lfi

3 Pr imer o r Tack Coot, Bitumen 3 ,100 Gals. $ -95 Ij 2 , L J L , ~ * ~ . : ; I 4 Asphal t Cernent Z12 Tons $ l h 6 . Y 7 $ 30,73:$,G1i 5 Shou lde r s , G r j n u l a r S u r f a c i n g of g I., 781,C!Tl 6 Permanent Paverni?nt Harking $ G,ti37,C,il

--.-- - T o t a l $1%3,2Ch.34

! !

.______-____.__._L___ . .. -- ........

- . 19 -.-.

~C"? .~ , l n":! < ,~ , . ,~ l< ,~ l "lac:: <<,c: ;,,,,I cr ,l!:,<,,,te ,hC, ,>:,!:;%; cmr C",,,,"C, I>~~,\v,I<!,, ,I,,, l>*o,#,:? 1,<;ra:,0.

..

Ilnil Tr i tc - ....... ---- .

$Z5!3.0U 8 23-03

. .... .... ...... ........ -.... .................................

-- 11<.111 t i;l~.liiiity

1 2

-

Uase, Cleanin;] 8 P r e p v r a t i u n o f Old ,:! 1110 Miles S p e c i a l Sand Mixture 13,370 f u n s

Special Provisions

f o r

Story County P ro jec t L-F-180--73-85

DELETE a l l of 2203.02B. and s u b s t i t u t e i n l i e u thereof t h e following:

B. Mineral aggregate w i l l be furnished by the County. The aggregate is i n the SEJt Sec. 22 ~-22W T-83N and s h a l l be loaded and hauled by cont rac tor

ADD t h e following sentence t o 2203.02. - D. Special Additive. A s p e c i a l l y processed and ref ined asphal t ,

a s i s manufactured by Chem-Crete Corporation of Menlo Park, Cal i forn ia under the name of "Chem-Crete" o r an approved equal, s h a l l be added t o the AC at the s to rage tank. The mixture s h a l l be thoroughly mixed f o r no l e s s than 30 minutes on the b a s i s of: one p a r t of Chem-Crete bitumen, by weight, is t o n ine p a r t s of t h e regular paving asphal t cement.

ADD t h e following sentence t o 2203.03. - When s torage b ins a r e used, the holding time s h a l l be l imi ted t o 4 hours.

ADD the following new paragraph t o 2203.23A. - The pr ice bid per ton of Asphalt Cement Concrete s h a l l include the cos t of furnishing and incorporat ing the add i t ive i n t o t h e mixture placed on f inished roadway.

The road s h a l l be kept open t o t r a f f i c . Not more than 200 f t . of center l i n e j o i n t s h a l l be l e f t open overnight.

Temporary Pavement Marking is not required. Permanent painted pavement markings a r e required.

Fabric reinforcement s h a l l be placed over the ex i s t ing bridge mat and i s inc iden ta l to the work. A 1" th ick mat placed over the f ab r i c . Fabric s h a l l be furnished and del ivered t o the s i t e by the county.

The Special Sand Mix s h a l l be completed no l a t e r than September 15, 1980.

Appendix C

Asphalt Cement Test Data

ASPHALT CEMENT CHARACTERISTICS

Absolute Viscosity Penetration (poises. )

Extractions Mar. and Apr., 1981

Co. Rd. E-57 Type B , 6% AC 72 1160

91 835 Type B w/Chem-Crete, 6% AC 9 2

105 68

Sand w/Chem-Crete, 7% AC 44

N. Dakota Street Ext. Sand w/Chem-Crete, 6% AC 2 4 Sand, 6% AC 7 3

Samples from Tanks

AC-10 and Chem-Crete 116 577

AC- 10 7 8 1018

Chem-Crete -- 3 1

Appendix D

Crack Survey

SUMMARY OF CRACK SURVEY

March 1981

E57 Sta 0+00 to Sta 32+75 Type B

Full width transverse cracks at approximately 300 foot intervals.

E57 Sta 33+30 to Sta 44+00 Type B w/Chem-Crete

Full width transverse cracks at approximately 100 foot intervals. Two foot transverse cracks at the center and the edge of slab spaced approximately 10 feet apart. Insignificant longitudinal cracking.

E57 Sta 44+00 to Sta 55+22 Sand w/Chem-Crete

Full width transverse cracks at approximately 30 foot intervals. Random transverse cracks ranging from 1 foot to 10 feet in length interspersed between full width cracks at approximately 6 foot intervals. Approximately 40% of the test section had centerline longitudinal crack- ing. Much of the crack pattern in this section appears to be reflective cracking.

North Dakota Street Extension Sta 0+00 to Sta 70+00 Sand w/Chem-Crete

Full width transverse cracks 30 to 40 feet apart in full width sections of Chem-Crete. The 8% sand mix with Chem- Crete had short (2 feet) transverse cracks at 10 foot spacings at the centerline.

NorthDakota Street Extension Sta 70+00 to Sta 90+00 Sand Rt. Side Sand w/Chem-Crete Lt. Side

The control had no crack pattern except for the cracks which were extending from the Chem-Crete portion. The sand with Chem-Crete had transverse cracks at approx- imately 8 to 10 feet apart; of which approximately 50% extended 1 to 4 feet into the control segment.

CRACK SURVE.Y DATA

March 1981

Transverse Cracks

(Lin. Ft./Sta.)

Co. Rd.

E-57

Sta 0+00 to Sta 32+75

Sta 33+30 to Sta 44+00

Sta 44+00 to Sta 54+00

North Dakota Street Ext.

TYP~ B

6% AC

Type B w/Chem-Crete, 6% AC

Sand w/Chem-Crete,

7% AC

Sta 3+00 to Sta 8+00

Sand w/Chem-Crete,

6%

AC

Sta 26+00 to Sta 29+00

Sand w/Chem-Crete

6% AC

Sta 70+00 to Sta 89+90 Lt. Side Sand w/Chem-Crete,

6% AC

Sta 70+00 to Sta 89+90 Rt.

Side Sand,

6% AC

Appendix E

R o a d R a t e r D a t a

SUMMARY OF ROAD RATER TESTING

Co. Rd. E-57

80% ~eflection (mils) before resurfacinq after resurfacing 6/1.9/80. 10/17/80 - 06/03/82

Type B, 6% AC 7.6

Type B W/Chem-Crete, 6% AC 6.5

Sand W/Chem-Crete, 7% AC 7.2

North Dakota Street Ext. 6/11/80 10/17/80 -- 06/03/82

Sand W/Chem-Crete, 6% AC 6.8 3.7 6.5

Sand, 6% AC 4.0* 4.5* 7.2*

Type B , 6% AC 5.2 3.7 4.8

* average of three tests