Roller-Compacted Concrete & Pervious Concrete Pavements
Roller-Compacted Concrete& Pervious Concrete PavementsRobert Garbini, P.E., PresidentNational Ready Mixed Concrete Association
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Antitrust Policy StatementThe National Ready Mixed Concrete Association assigns the highest priority to full compliance withboth the letter and the spirit of the antitrust laws. Agreements among competitors thatunreasonably limit competition are unlawful under federal and state antitrust laws, and violators aresubject to criminal fines and incarceration, civil fines and private treble-damage actions. Even thesuccessful defense of antitrust litigation or an investigation can be very costly and disruptive. It isthus vital that all meetings and activities of the Association be conducted in a manner consistentwith the Association’s antitrust policy.Examples of illegal competitor agreements are those that attempt to fix or stabilize prices, toallocate territories or customers, to limit production or sales, or to limit product quality and servicecompetition. Accordingly, it is inherently risky and potentially illegal for competitors to discussunder Association auspices, or elsewhere, the subjects of prices, pricing policies, other terms andconditions of sale, individual company costs (including planned employee compensation), thecommercial suitability of individual suppliers or customers, or other factors that might adverselyaffect competition.It is important to bear in mind that those in attendance at Association meetings and activities mayinclude competitors, as well as potential competitors. Any discussion of sensitive antitrust subjectswith one’s competitors should be avoided at all times before, during, and after any Associationmeeting or other activity. This is particularly important because a future adversary may assert thatsuch discussions were circumstantial evidence of an illegal agreement, when viewed in light ofsubsequent marketplace developments, even though there was, in fact, no agreement at all.If at any time during the course of a meeting or other activity, Association staff believes that asensitive topic under the antitrust laws is being discussed, or is about to be discussed, they will soadvise and halt further discussion for the protection of all participants. Member attendees at anymeeting or activity should likewise not hesitate to voice any concerns or questions that they mayhave in this regard.Adopted by the NRMCA Board of DirectorsSeptember 18, 2006.
Topics of Discussion What is Roller-Compacted Concrete?What is Pervious Concrete?ApplicationsBenefitsConstructionResources
What isRoller-CompactedConcrete Pavement?
Ingredientsfor RCC
Conventional PCC143 pcf11%C.M.16%Water6%Air26%Fine Agg.41%Coarse Agg.Roller-Compacted Concrete153 pcf10%C.M.13%Water1.5%Air35.0%Fine Agg.40.5%Coarse Agg.
Slide courtesy of Wayne Adaska, PCA
Slide courtesy of Frank Lennox, Buzzi Unicem, Chattanooga, TN
15-20 ft.
Durability
Speed Constructionof ConstructionOne-PassPhoto courtesy of Andale Ready Mix Central and Andale Paving, Inc.
Reflectivity
Heat IslandReduction
Intermodal Yards
Mid-Size to Large Parking Lots
DeflectionRoughness
www.cptechcenter.org
What isPerviousConcrete?
Typical Pervious Concrete Mix Design 450-550 lbs. Cementitious– Fly Ash / Slag Cement substitute acceptable atstandard rates 27 ft3 Coarse Aggregate– Aggregate size will affect drainage rate 0.25 – 0.37 W/C Ratio– Sufficient water to display a wet, metallic sheen onthe aggregate High Range Water Reducer, ViscosityModifier, Hydration Stabilizer
Pervious Concrete Properties 15% to 35% air void content– Field studies show 20-25% average 100 to 125 lbs/ft3 unit weight 2500 to 3500 psi strength*– Introduction of small amount of fineaggregate can increase strength to4000 psi ( /-)– compressive strength typically notused as acceptance criteria. Air voidstructure and unit weight are usedinstead.
RechargeGroundwater Flood Prevention /Management Improved WaterQualityBenefits of Pervious Concrete
Applications for Pervious ConcreteParking LotsStreets / Local RoadsNature Trails / PathwaysErosion ControlGreenhouses / NurseriesEnvironmentally Sensitive Developments
How Many Cars CanYou Park On ADetention Pond?
US EPA - Clean Water ActEPA Storm Water Phase II Final Rule(EPA 2000) Cities over 50,000 Reduce or eliminate runoff Post construction runoff must notexceed Pre-Construction runoff “Treatment” of Pollutants (Percolation) Groundwater and aquifer recharge Minimize Flooding Pervious Concrete is accepted by EPA asa BMP for Stormwater Management
Energy Independence andSecurity Act (EISA) 2007 Section 438– “Storm water runoff requirements for federaldevelopment projects. The sponsor of anydevelopment or redevelopment project involving aFederal facility with a footprint that exceeds 5,000square feet shall use site planning, design,construction, and maintenance strategies for theproperty to maintain or restore, to the maximumextent technically feasible, the predevelopmenthydrology of the property with regard to thetemperature, rate, volume, and duration of flow.”
US GreenBuildingCouncilVersion 2.2
Jointing
ACI 522-R & 522.1Available throughAmericanConcrete Institutewww.concrete.org
Specification Recommendations Target void content of 15% to 25% asmeasured by ASTM C1688* Fresh density of pervious concrete shallbe within 5 lbs. /- of the fresh density ofthe specified fresh density (approved mixdesign).* Suggested text - Not taken from ACI 522.1-08
ASTM Test ProceduresFresh Concrete Density and Voids Content ASTM C1688-12: Standard Test Method for Densityand Void Content of Freshly Mixed PerviousConcreteField Permeability (Infiltration Rate) ASTM C1701-09: Standard Test Method forInfiltration Rate of In-Place Pervious ConcreteHardened Concrete Density and Porosity ASTM C1754-12: Density and Void Content ofHardened Pervious Concrete
m
NRMCA CertifiedCraftsmanNRMCA CertifiedInstallers
www.PerviousPavement.org
National Ready Mixed Concrete AssociationRobert Garbini, P.E.Presidentrgarbini@nrmca.org240-485-1139
ASTM C1701-09: Standard Test Method for Infiltration Rate of In-Place Pervious Concrete Hardened Concrete Density and Porosity ASTM C1754-12: Density and Void Content of Hardened Pervious Concrete . NRMCA Pervious Concrete Con
The pervious concrete was placed over the gravel layer and compacted using a manual compaction hammer due to space restriction. It is important to notice that compaction can alter pervious concrete characteristics [4]. 2.2. Pervious Concrete Characteristics The pervious concrete surface consists of a mix design containing a cement type CP V Ari .
concrete will be greatly expanded with the study of newly constructed test cells. These cells are Cell 85, Portland Cement Concrete (PCC) pervious on sand and 89, PCC pervious on clay on the MnROAD Low Volume Road. Use of Pervious Concrete in Construction of Pavement for Improving Their Performance Patil, V. R., Gupta, A. K., and Desai, D. B.
Mix Design, Thickness Design, and Construction of Roller-Compacted Concrete Pavement THOMAS D. WHITE ABSTRACT Roller-compacted concrete pavement (RCCP) is a technology that involves the use of conventional materials and construction equipment in an unconventional ap plication. The result is a savings in time of concrete pavement construction, .
Pervious concrete, sometimes referred to as “no-fi nes concrete,” is a mixture of hydraulic cement, coarse aggregate of smaller size, admixtures and water. Pervious concrete allows the water to percolate through the concrete into the sub-base and recharge the underground water level. Typically,
Pervious concrete, also known as porous concrete (enhanced porosity) or gap-graded concrete has little to no fine aggregates. Pervious concrete mixes consist of cement, single sized coarse aggregate and water (water/cement ratio ranging 0.3 to 0.4). It is reported that, the 28-day compressive strength of
and cylinders. The outcome of the experiment validated the fact that permeable concrete has lower compressive strength than conventional concrete (Chopra et al., 2007) MIX DESIGN: Pervious Concrete is a mixture of Cement, Coarse Aggregate / Gravel and Water. No Fine Aggregates are used for making pervious concrete.
4 TIMKEN METRIC TAPERED ROLLER BEARINGS BEARING DATA TIMKEN METRIC TAPERED ROLLER BEARINGS Bore Part Number Dimension Series (ISO 355) Bearing Dimensions Bore d O.D. D Width T B Width C mm mm mm mm mm mm 15 30302 2FB 15.000 42.000 14.250 13.000 11.000 17 30203 2DB 17.000 40.000 13.250 12.000 11.000 30303 2FB 17.000 47.000 15.250 14.000 12.000 20 File Size: 279KBPage Count: 20Explore furtherTapered Roller Bearing Catalog Timkenwww.timken.comTimken Tapered Roller Bearing Catalog - TIMKEN - PDF .pdf.directindustry.comTimken Metric Tapered Roller Bearing Catalogwww.timken.comTIMKEN METRIC TAPERED ROLLER BEARINGSwww.timken.comTimken-Tapered Roller Bearing Catalogue - THE TIMKEN .pdf.aeroexpo.onlineRecommended to you b
Test Report No.: E2552 .04 -501 -47 Report Date: 07/12/16 Page 6 of 9 7.0 Test Results : The temperature during testing was 20.5 C ( 69 F). The results are tabulated as follows: Test Specimen #1 : Title of Test Results Allowed Note Operating Force, per ASTM E 2068 Initiate motion: 45 N ( 10 lbf) 60 N ( 13 lbf) max. Maintain motion:
