Pervious Concrete and its application
-
Upload
pragya-roy -
Category
Documents
-
view
220 -
download
1
Transcript of Pervious Concrete and its application
-
8/6/2019 Pervious Concrete and its application
1/34
Welcome to the Future in Concrete!!
ENVIR NMENT L FRIENDLYENVIR NMENT L FRIENDLYPERVIOUS CONCRETEPERVIOUS CONCRETE
Dr.Dr. ThanakornThanakorn PragyaPragya N Roy (Peter)N Roy (Peter)
-
8/6/2019 Pervious Concrete and its application
2/34
-
8/6/2019 Pervious Concrete and its application
3/34
W hat is Pervious Concrete ?W hat is Pervious Concrete ?
A performanceA performance --engineered structuralengineered structuralmaterial usin the usual constituents ofmaterial usin the usual constituents of
conventional PCC, only with little or noconventional PCC, only with little or nosand in the mixture , allowing for a 15sand in the mixture , allowing for a 15--3030
percen a r vo ac or.percen a r vo ac or.
It allows 3It allows 3--8 gallons of water/min to pass8 gallons of water/min to pass.. . .. . It is an openIt is an open--cell structure with ancell structure with an
appearance sometimes described as that ofappearance sometimes described as that of
a a RiceRice KrispiesKrispies
-
8/6/2019 Pervious Concrete and its application
4/34
-
8/6/2019 Pervious Concrete and its application
5/34
Pervious Concr ete Is Not a New Material :
First known use in 1852 on isle of Wright for 12 to 14 in. thick walls for homes
,
and Europe .
One British firm constructed over 250 000 homes .
Mid 1960s, experimental road in England -
- 8-in conventional concrete in conventional concrete
- 2-in pervious concrete bonded overlay in pervious concrete bonded overlay
First use for pavements in U.S. In early 1970s in Florida .
Most of the activity has been in the southeast primarily Georgia,
Florida and now Enhanced Porous Concrete pavement is in Mexico,Texas,
, , , .
California.
-
8/6/2019 Pervious Concrete and its application
6/34
GENERAL BACKGROUND OF PERVIOUSGENERAL BACKGROUND OF PERVIOUS
CONCRETECONCRETE Materials for PerviousMaterials for PerviousConcrete Production:Concrete Production:--
CementitiousCementitious material:material:-- Portland &Portland &blended cements,blended cements, flyashflyash,,pozzolanas,GGFSpozzolanas,GGFS..
Coarse aggregate:Coarse aggregate: -- 3/4in.3/4in. 1in., A/C1in., A/Cratio= 4ratio= 4 4.5 by mass.4.5 by mass.
Water :Water : water/water/cementitiouscementitious ratios =ratios =0.270.27--0.30.3
Admixtures.Admixtures.
Pervious concrete is made with a narrow aggregate gradation,but differentsur ace ex ures can e o a ne roug e use o eren max mumsizes. The concrete in the box contained a 14-in. (6.5-mm) top size, while
that below used a larger topsize, 3/4 in. (20 mm)
-
8/6/2019 Pervious Concrete and its application
7/34
Mix Proportion of Pervious Concrete:Mix Proportion of Pervious Concrete:--
Carefully controlled amounts of water &Carefully controlled amounts of water & cementitiouscementitious materials arematerials are
particles without flowing off during mixing & placing.particles without flowing off during mixing & placing.
(b) properamount of water,
(a) too little water
(c) too much water.
Samples of pervious concrete with different water contents, formed into a ball:
-
8/6/2019 Pervious Concrete and its application
8/34
Three major groups of pervious concreteThree major groups of pervious concrete..
-
8/6/2019 Pervious Concrete and its application
9/34
-
8/6/2019 Pervious Concrete and its application
10/34
Pervious Concrete PavementPervious Concrete Pavement
nv ronmen a van agesnv ronmen a van ages
Percolation RechargesPercolation RechargesGroundwaterGroundwater
Water Resources are ConservedWater Resources are Conserved Less Need for IrrigationLess Need for Irrigation
areare allowed More Rainwaterallowed More Rainwater
Runoff to Streams and Lakes isRunoff to Streams and Lakes is
Cooler Surface Has Less ImpactCooler Surface Has Less Impacton Air Temperatureon Air Temperature -- Urban HeatUrban HeatIsland EffectIsland Effect
-
8/6/2019 Pervious Concrete and its application
11/34
Pervious Concrete PavementsPervious Concrete Pavements
Model Natural Ground CoverModel Natural Ground Cover
and Can be Used as Part of a Systemand Can be Used as Part of a SystemDesi ned to Meet Re uirements for: Desi ned to Meet Re uirements for:
SustainabilitySustainability
Impervious Area ZoningImpervious Area ZoningRe uirementsRe uirements
-
8/6/2019 Pervious Concrete and its application
12/34
Solution to StormwaterSolution to StormwaterManagementManagementSTORMWATER IN
PERVIOUSCONCRETE
AGGREGATE
BASE
STORMWATER OUT
-
8/6/2019 Pervious Concrete and its application
13/34
LowLow--Impact DevelopmentImpact Development P ll i n Tr m nP ll i n Tr m n Recharging GroundwaterRecharging Groundwater
LEED RequirementsLEED Requirements
Cool Communities (Urban Heat IslandCool Communities (Urban Heat IslandEffect)Effect)
-
8/6/2019 Pervious Concrete and its application
14/34
Pre-Development Post-Development Low-ImpactDevelopment
-
8/6/2019 Pervious Concrete and its application
15/34
Pollution TreatmentPollution Treatment=> Porous
About 90% of the surfaceAbout 90% of the surface Allow manymega litres ofPavement
po utants are carr e o ypo utants are carr e o y
the first the first --inch to 1inch to 1--inchinchof rainfall first flushof rainfall first flush
good freshwater tobecomecontaminated
First flush passes throughFirst flush passes through
pavement into soilpavement into soil
contaminatedby thepollutants onour streets
Soi i ters an treatsSoi i ters an treatsrainfallrainfall
and pollutecoastalwaterwaysentire parking area (insteadentire parking area (insteadof detention pond)of detention pond) Capture andcleanse the
Orc ea se ewater for ouruse?
-
8/6/2019 Pervious Concrete and its application
16/34
Rechar in Groundwater andRechar in Groundwater andAquiferAquifer
-
8/6/2019 Pervious Concrete and its application
17/34
Can pave within the drip line
Water and air filters to roots
-
8/6/2019 Pervious Concrete and its application
18/34
ReReduceduce stormwaterstormwaterrunoffrunoff
Use RecycledUse Recycled
MaterialsMaterials Use RegionalUse Regional
MaterialsMaterials
Reduce urban heatReduce urban heatislandsislands
-
8/6/2019 Pervious Concrete and its application
19/34
ypical Structure Designypical Structure Design(cross section diagram)(cross section diagram)
Pervious ConcretePervious Concrete
Compacted SubCompacted Sub--basebase(#57/#67 Stone)(#57/#67 Stone)
Filter FabricFilter Fabric
Com acted SubCom acted Sub-- raderadeumum
(92% max)(92% max)
2feetmin
i
2feetmin
i
(wet season level)(wet season level)
-
8/6/2019 Pervious Concrete and its application
20/34
BASIC INSTALLATION RECOMMENDATIONSBASIC INSTALLATION RECOMMENDATIONSfor Pervious Pavementfor Pervious Pavement
ero s ump sero s ump s Set forms with screed stripsSet forms with screed strips Use vibratory truss or rollers to spreadUse vibratory truss or rollers to spread
Compact materials with rollersCompact materials with rollers No need for troweling!No need for troweling! Joint s acin : No reater than 40Joint s acin : No reater than 40 Cure w/ plastic sheetingCure w/ plastic sheeting ==
-
8/6/2019 Pervious Concrete and its application
21/34
-
8/6/2019 Pervious Concrete and its application
22/34
Fine Grading & Compacting Base.
AA--frame Vibratory Screed & Rollerframe Vibratory Screed & Rollerstrikes off and compacts the surfacestrikes off and compacts the surface
Protect & cover
-
8/6/2019 Pervious Concrete and its application
23/34
-
8/6/2019 Pervious Concrete and its application
24/34
Other Applications for Porous ConcreteOther Applications for Porous Concrete
Greenhouse Floors, fish hatcheriesGreenhouse Floors, fish hatcheries Surface Course for Tennis CourtsSurface Course for Tennis Courts Basketball CourtsBasketball Courts Public walkwaysPublic walkways Swimming pool decksSwimming pool decks ParksParks Plazas and PatiosPlazas and Patios
Groins & SeawallsGroins & Seawalls e n ngse n ngs ZoosZoos Load bearing wallsLoad bearing walls
-
8/6/2019 Pervious Concrete and its application
25/34
Architectural Pervious ConcreteArchitectural Pervious ConcreteUniv. of Calif.Univ. of Calif. -- BerkeleyBerkeley
Sidewalk
Taller buildings, preservingnatural areas
Pervious gravel parking areas
-
8/6/2019 Pervious Concrete and its application
26/34
NOISE BARRIERNOISE BARRIER
Two mechanisms for noise abatement generallyTwo mechanisms for noise abatement generally
accepted:accepted: Decreased intensityDecreased intensity
at the tireat the tire pavement interface;pavement interface;andand
Dissipation of theDissipation of thegenerated as well asgenerated as well as
other incident noiseother incident noisewithin the porewithin the pore
structure of perviousstructure of perviousconcrete in the formconcrete in the form
of heat.of heat.
-
8/6/2019 Pervious Concrete and its application
27/34
Heat Island ReductionHeat Island ReductionHi h void factor and lower densitHi h void factor and lower densit less solar heat absor tion andless solar heat absor tion and
rapid cooling.rapid cooling.Lighter colour provides better reflectivity.Lighter colour provides better reflectivity.
-
8/6/2019 Pervious Concrete and its application
28/34
MAINTENANCE
Can Use Vacuum, Pressure Water, Pressure Air or Combination.
Have Been Unable to Find Anyone who Does Maintain other thanfor Normal Street
Have Been Unable to Find Anyone who Needs to Maintain
As defined by critical reduction in capacity Water runs off instead of draining through
Continuousl Informin Staff and Public
Protection Guidelines for Future Work in Area
-
8/6/2019 Pervious Concrete and its application
29/34
COSTS
Materials Cost Average 20% - 40% Higher than NormalConcrete
Due to slower discharge and loading rates
Construction is Simpler, Quicker than for Normal Concrete Larger Projects will Usually Drive Lower Unit Costs NRMCA-Certified Contractors
Benefit is to Avoid Losing Land to Retention Ponds andCreating more Runoff and Pollution
-
8/6/2019 Pervious Concrete and its application
30/34
DenverDenver Next AM Following 12 SnowNext AM Following 12 Snowtes rect y across streettes rect y across street
Photos: 5 min. differential maxPhotos: 5 min. differential max
Pervious ConcretePervious Concrete Conventional AsphaltConventional Asphalt
-
8/6/2019 Pervious Concrete and its application
31/34
CONCLUSIONCONCLUSION The use of pervious concrete is among the Best Management Practices
(BMP) recommended by the EPA and other agencies for themanagement of storm water runoff on a regional and local basis.
Eliminates the need for retention ponds, swales and other storm waterdevices.
Lowers overall project costs on a first-cost basis. Makes efficient use of land. Good for Bicycles but Bad for Skateboards .
is very sensitive to water and thus difficult to mix correctly.
Very few contractors know how to install it correctly..
Thus, we will see more applications and our expertise with porousmaterials will grow.
n ou s a s a ac c, we nee o use s ec no ogy asalmost all types of weather conditions found here.
-
8/6/2019 Pervious Concrete and its application
32/34
REFERENCES:REFERENCES:
American Concrete Institute 522R-06 on Pervious Concrete May2006 htt ://www.aciint. or /PUBS/new ubs/522.htm
National Ready Mixed Concrete Association Pervious ConcretePublicationswww.nrmca.org
Mixed Concrete Association, May 2004. www.nrmca.org
Pervious Concrete Contractor Certification, National ReadyMixed Concrete Association Au ust 2005. www.nrmca.or
City of Seattle Department of Planning and Development ClientAssistance Memo #515.htt ://www.ci.seattle.wa.us/dclu/Publications/cam/CAM515. df
LID Technical Guidance Manual for Puget Sound,http://www.psat.wa.gov/Publications/LID_tech_manual05/lid_index.
htm
-
8/6/2019 Pervious Concrete and its application
33/34
-
8/6/2019 Pervious Concrete and its application
34/34