Concrete roads in Germany case study: Design …€¦ · „Concrete roads in Germany case study:...

„Concrete roads in Germany case study: Design parameters and challenges”

Prof. Dr. Thomas Matschei

www.wirtgen.de

T. Matschei IEA Workshop Materials Trends in Transportation 08.03.2018Seite 2

Germany has the 2nd largest highway network in Europe

14,981

12,917

11,560

6,844

5,242

3,875

3,065

2,191

2,088

1,763

1,695

1,561

1,482

1,429

1,290

0 2000 4000 6000 8000 10000 12000 14000 16000

Spain

Germany

France

Italy

Netherland

UK

Portugal

Austria

Sweden

Belgium

Hungary

Denmark

Poland

Switzerland

Croatia

Highway Road Network [km]

Source: Eurostat; UNECE; Bundesanstalt für Straßenwesen; IRTAD ID 154113

With ~5.6% of the total road network highways carry ~ 48% of all traffic related

loads in Germany;

30

70

Highways: Concrete vs Asphalt

Concrete Asphalt

http://de.statista.com/statistik/daten/studie/154113/umfrage/netzlaenge-der-autobahnen-in-europaeischen-laendern/


Concrete Paving _ Very strict national technical design and test guidelines,

but so far only limited consideration of environmental impacts

ZTV Beton-StB 07 TL Beton-StB 07 TP Beton-StB 10German

Enhanced Technical Specs for

Concrete Roads

Execution guidelines Testing guidelines


Depending on the expected loads there are different Design

possibilities

RStO 12

Upper layer ≥40mm (min.

420kg cement)

Lower layer (>20cm;

min 350kg cement)

Sublayer ~15cm (typically

lower grade concrete)

Main

concrete

Gravel layer 20-40cm (e.g.

recycled concrete)


Typical design of todays German highways made of concrete

Press joints ~5 anchors / slabLongitudinal joints

3 anchors per slab

Concrete 26 cm

HGT (low grade

concrete)15 cm

Gravel 29 – 49 cm

4,50 m 4,50 m 3,00 m

Passing lane main lane side strip

2 lane pavement 12 m

Transverse contraction joint incl.

anchors


Asphalt vs. Concrete

Asphalt Concrete

Installation Cost (incl.

Manufacturing)

Depending on oil Price, but

generally lower than concrete

Higher than asphalt

Maintenance Cost Typically higher due to lower

mechan. performance

Ideally less maintenance;

longer service life

Construction Speed Depending (hardens within

hours)

Depending (hardens

within hours/days)

Durability Lower especially at extreme

temperatures

Ideally significant higher

than asphalt

Safety Darker Advantages due to bright

color at night; longer

better grip than A.

Recylability Common practice Doable but more difficult

than A.

GWP Concrete w. slight

advantage


Concrete roads save fuel??

Source: MITCSHub 2016

https://www.nrmca.org

0

500

1000

1500

2000

2500

Concrete Asphalt Concrete Asphalt

GH

G E

mis

sio

ns

(Mg

CO

2e

)

PVI (Deflection)

Production + M&R

High volume road:

AADT: 25,000 (2500 trucks)

2 lanes in each direction

Arterial road:

AADT: 7500 (750 trucks)

2 lane in each direction


Ideally Concrete roads should have lower total cost impact over

a longer Service life?


Unfortunately the image of concrete roads suffered, due to

durability issues in Germany


Very strict testing scheme in place to avoid deleterious durability

problems in the future

Authorities are currently not clear

which material concept is the

preffered choice for the future!


Challenges to be tackled

Increasing frequency of extreme

temperature conditions + global warming

Increased freight traffic especially on

highways expected

439520

581686

842

982

1,092

1,218

0

200

400

600

800

1000

1200

1400

1995 2000 2005 2010 2020 2030 2040 2050

Fre

igh

ttr

afic

in b

iotk

m

ProgTrans

Prognosis Germany

Aging Infrastructure

Environmental restrictions

Concrete roads in Germany case study: Design …€¦ · „Concrete roads in Germany case study:...

Documents

Transcript of Concrete roads in Germany case study: Design …€¦ · „Concrete roads in Germany case study:...