INNOVATIVE INTEGRATED METHODOLOGY FOR THE USE OF DECONTAMINATED RIVER SEDIMENTS IN ROAD CONSTRUCTION Prof. Ing. Massimo Losa Dott. Ing. Pietro Leandri.

INNOVATIVE INTEGRATED METHODOLOGY FOR THE USE OF DECONTAMINATED RIVER SEDIMENTS IN ROAD CONSTRUCTION

Prof. Ing. Massimo LosaDott. Ing. Pietro LeandriDott. Ing. Patrizia Rocchio

Preliminary Results

“Innovative integrated methodology for the use of decontaminated river sediments in plant nursing road construction”

CLEANSED - LIFE 12 ENV/IT/000652

SUMMARY

1. SCENARIO

2. CRITERIA FOR REUSE OF SEDIMENTS IN ROAD CONSTRUCTION

3. PROJECT OBJECTIVES

• Characterization of dredged sediments for the evaluation of the use as a structural material in road construction

• Implementation of the road construction demonstration field

4. FIRST PHASE ACTIVITIES

• Sediment characterization

5. RESULTS

1. SCENARIO

2. CRITERIA FOR REUSE OF SEDIMENTS IN ROAD CONSTRUCTION

3. PROJECT OBJECTIVES

• Characterization of dredged sediments for the evaluation of the use as a structural material in road construction

• Implementation of the road construction demonstration field

4. FIRST PHASE ACTIVITIES

• Sediment characterization

5. RESULTS

Pisa, 03 Aprile 2014




DREDGING

dredged sediments

STORAGE of sediments in a confined area

storage site

MANAGEMENT of polluted dredged sediments for use in road construction

DEWATERING

DE-CHLORIDIZATION

SCENARIO

Navicelli canal




Large volumes of sediments are dredged in Europe in order to maintain harbour activities

Road construction begins with the removal of earth and rock, construction of embankments, filling with sand or a sand-rich mixture with fine gravel

The potential use of dredged river sediments as filling material for road building will be investigated on lab scale and on demonstration field

SCENARIO




PROJECT OBJECTIVES

Implementation of the road construction demonstration field by utilizing treated sediments as a fill material for road building

Cross section




PROJECT OBJECTIVES

Characterization of dredged sediments for the evaluation of the use as a structural material in the road construction

Materials for road construction purposes requires checking specific criteria

A1, A2-4 ,A2-5, A3A2-6 A2-7

A4, A5, A6 stabilization with lime/cement

CNR UNI 10006 groups:

• Definition of the most appropriate mixture(s) of decontaminated dredged sediments and other standard materials• The treated sediments will be applied in different proportions and percentages, in order to demonstrate the wide range of possible features and applications




EXPERIMENTAL PROGRAM

LABORATORY TESTS :• Water content• Soil classification (CNR UNI 10006/02)• Presence of organic matter (UNI EN 1744-1)• Mix design by gyratory compactor and

measuring of tangential stress→(influence of the addition of sediments on the thickening of the mixtures)

• Mechanical tests (resistance to compression with free lateral expansion, CBR index before/after saturation, etc)

Sample before and after dewatering process

Next trial





• Soil classification (CNR UNI 10006):Particle size distributionPlasticity index (IP=LL-LP)





• Determination of organic components affecting curing of cement (UNI EN 1744-1)→ Humus contentThe method is based on the principle that humus develops a dark colour when it reacts with sodium hydroxide(NaOH). The intensity of the colour depends on the humus content. The test solution is compared with the reference solution.

• Water content (%):




RESULTS

SAMPLE ID

1 Sabbioso- argilloso Media contaminazione

2 Sabbioso Bassa contaminazione

3 Argilla- limo Media contaminazione

4 Incile5 Vasca6 Draga




RESULTS

Sample ID 1 2 3 4 5 6

%pass 2.0 mm 93.5 86.5 91.5 96.6 96.3 97.6

%pass 0.4 mm 86.5 68.6 84 90.8 91.4 84.6

%pass 0.075 mm 30.4 13.1 65.3 87.6 70 40.7

LL 27 26 42 54 30 27

LP 15 n.d. 26 29 15 18

IP 12 n.d. 16 52 15 9

IG 0.3 0 8.8 16.8 9.0 1.1

Water content (%) 97.0 169.4 65.0 42.5 - 57.8

ClassificazioneCNR UNI 10006 A2-6 A2-4 A7-6 A7-6 A6 A4

Organic components Yes/No No Yes Yes/No Yes Yes

INNOVATIVE INTEGRATED METHODOLOGY FOR THE USE OF DECONTAMINATED RIVER SEDIMENTS IN ROAD CONSTRUCTION Prof. Ing. Massimo Losa Dott. Ing. Pietro Leandri.

Documents

road construction materials

road construction purposes

treated sediments

addition of sediments

reuse of sediments

construction of embankments

large volumes of sediments

envit000652 pisa