Designing with Geogrids
Transcript of Designing with Geogrids
-
7/24/2019 Designing with Geogrids
1/24
DESIGNING WITHGEOGRIDSProperties and Test Methods. Designing for GeogridReinforcements. Design Criti!e. Constr!ctionMethods
-
7/24/2019 Designing with Geogrids
2/24
INTROD"CTION
Matri# $i%e materia$s. Open Spaces ca$$ed apertures&'( to '((mm )eRibsare the $ongit!dina$ and trans,erse respecti,e$-. REINFORCEM
Uniaxial or Unidirectional Geogridsare for *a$$s and s$opes. BidirBiaxial Geogrids are for Pa,ements and o!ndation.
-
7/24/2019 Designing with Geogrids
3/24
PH/SIC01 PROPERTIESPROPERTIES 0ND TEST METHODS2.'.'
Ri) Dimensions. 3!nction T-pe. 0pert!re Si4e. Thic%ness 5STR0IGH
ORW0RD Mass per !nit 0rea &6(( to '((( g7m6+. Percent Open 0rea &8( to 9
DENSITY. Or speci>rigidit-+. 0 geogrid hangs on an inc$ined P$ane at an ang$e 8'.:degrthe hori4onta$. When the geogrid )ends and e,ent!a$$- to!ches theof the inc$ined p$ane@ its distance is meas!red and then re$ated to tper !nit area.
IN-PLANE TORSIONAL STIFFNESS. C$amping a s!are )idirectio
geogrid test specimen in a rigid frame and
-
7/24/2019 Designing with Geogrids
4/24
END"R0NCE PROPERTIESPROPERTIES 0ND TEST METHODS2.'.2
INSTALLATION DAMAGE.P$acement of geogrids in the
-
7/24/2019 Designing with Geogrids
5/24
END"R0NCE PROPERTIESPROPERTIES 0ND TEST METHODS2.'.2
CREEP RUPTURE BEHAVIOR.Bariation of tension creep. In this pr
higher stresses are imposed on the specimens. 0 graph@ $oad,ers!can )e generated. When e#trapo$ated o!t of the desired ser,ice $ifaccepta)$e $oad can )e o)tained. When norma$i4ed to the shortterthe in,erse ratio )ecomes the red!ction factor to )e app$ied on !$tistrength.
ACCELERATED TESTING METHODS. "ti$i4es timetemperat!res!perposition &TTS+ to prod!ce series of c!r,es at ,ario!s e$e,atedtemperat!re. There are 6 ,ariations of TTS. 0s per 0STM D:696 app*hich !ses indi,id!a$ test specimens for each temperat!re step anincrement. Stepped Isotherma$ Method &0STM DA996+@ !ses same sand cascades strain meas!rements at each temperat!re increment
-
7/24/2019 Designing with Geogrids
6/24
DEGR0D0TION ISS"ESPROPERTIES 0ND TEST METHODS2.'.2
-
7/24/2019 Designing with Geogrids
7/24
DEGR0D0TION ISS"ESPROPERTIES 0ND TEST METHODS2.'.2
-
7/24/2019 Designing with Geogrids
8/24
DEGR0D0TION ISS"ESPROPERTIES 0ND TEST METHODS2.'.2
-
7/24/2019 Designing with Geogrids
9/24
DEGR0D0TION ISS"ESPROPERTIES 0ND TEST METHODS2.'.2
-
7/24/2019 Designing with Geogrids
10/24
DEGR0D0TION ISS"ESPROPERTIES 0ND TEST METHODS2.'.2
-
7/24/2019 Designing with Geogrids
11/24
P0BED RO0DS 5 0SECO"RSESDESIGNING OR GEOGRID REINORCEMENT2.6.'The use of geogrids in paved road aggregate base courses is an are
the large aperture size provide an excellent advantage.
-
7/24/2019 Designing with Geogrids
12/24
P0BED RO0DS 5 0SECO"RSESDESIGNING OR GEOGRID REINORCEMENTThe use of geogrids in paved road aggregate base courses is an are
the large aperture size provide an excellent advantage.
-
7/24/2019 Designing with Geogrids
13/24
P0BED RO0DS 5 0SECO"RSESDESIGNING OR GEOGRID REINORCEMENTThe use of geogrids in paved road aggregate base courses is an are
the large aperture size provide an excellent advantage.
-
7/24/2019 Designing with Geogrids
14/24
P0BED RO0DS 5 P0BEMENDESIGNING OR GEOGRID REINORCEMENT2.6.6
There is a research on the p$acement of geogrids direct
*ithin the pa,ement itse$f &)it!men or concrete+The materia$ and t-pe of geogrid is ,er- important@ sinaspha$t *i$$ not easi$- )ond to s!rfaces of po$-eth-$enepo$-prop-$ene@ or po$-ester.
!t it can do for -arnt-pe geogrids. Partic!$ar$- if )it!mcoated.
The in?!ence of geogrid shrin%age d!ring p$acement oaspha$t ma- )e a pro)$em for mo$ec!$ar stress re$a#ati$oss of strength or mod!$!s for high$- oriented geogrids
In spite of the a)o,e comments@ s!ccess has )een repothe pre,ention of re?ecti,e crac%ing !sing geogrids as
arresters.
-
7/24/2019 Designing with Geogrids
15/24
P0BED RO0DS 5 P0BEMENDESIGNING OR GEOGRID REINORCEMENT
The use of geogrids to retard and minimize reective cracking with
pavements from propagating through newly placed asphalt overlaytopic of great interest.
Power Law to calculate the rate of crack
propagation through the new overlay thickness
-
7/24/2019 Designing with Geogrids
16/24
P0BED RO0DS 5 P0BEMENDESIGNING OR GEOGRID REINORCEMENT
xample
-
7/24/2019 Designing with Geogrids
17/24
P0BED RO0DS 5 P0BEMENDESIGNING OR GEOGRID REINORCEMENT
!olution
-
7/24/2019 Designing with Geogrids
18/24
P0BED RO0DS 5 P0BEMENDESIGNING OR GEOGRID REINORCEMENT
!olution
-
7/24/2019 Designing with Geogrids
19/24
"NP0BED RO0DSDESIGNING OR GEOGRID REINORCEMENT2.6.2
The use of geogrids to reinforce soft and"or compressible foundation
unpaved aggregate roads is a ma#or application area. Mechanisms of reinforcement are increase soi$ strengthenhanced $oad spreading@ and mem)rane s!pport ,iacontro$$ed r!tting.
The dierence in re!ired thic%ness of stone )ase is thcompared *ith the cost of the insta$$ed geogrid@ it is
recommended for !se. Nonreinforced Case@ ".S. 0rm- Corps of Engineers !nparoad form!$a has )een adapted that inc$!des n!m)er o,ehic$e passages.
-
7/24/2019 Designing with Geogrids
20/24
"NP0BED RO0DSDESIGNING OR GEOGRID REINORCEMENT
$or the geogrid reinforced case% new concepts are developed that in
mentioned mechanisms. The e&ect are as follows'
-
7/24/2019 Designing with Geogrids
21/24
"NP0BED RO0DSDESIGNING OR GEOGRID REINORCEMENT
$or the geogrid reinforced case% new concepts are developed that in
mentioned mechanisms. The e&ect are as follows'
-
7/24/2019 Designing with Geogrids
22/24
"NP0BED RO0DSDESIGNING OR GEOGRID REINORCEMENT
(y taking the combined e&ect of the )rst*two mentioned mechanismcomparing it to non*reinforced case% +iroud et. al developed a design
-
7/24/2019 Designing with Geogrids
23/24
CONSTR"CTION METHODDESIGNING OR GEOGRID REINORCEMENT2.8
-
7/24/2019 Designing with Geogrids
24/24
DESIGNING OR GEOGRID REINORC
httpF77constr!ctionre,ie*on$ine.com76(':7('7'9thingsneeeogrids7
httpF77geos-nthetics.ifai.com7*p
content7!p$oads7sites76676(':7'(7geogrid)roch!re.pdf
http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/http://constructionreviewonline.com/2015/01/19-things-need-know-geogrids/