De Kogge – Doel 1: Condition assessment and implementation of the conservation process

De Kogge – Doel 1 Condition assessment and implementation of the conservation process

Material condition assessment

Structural condition assessment

Conservation plan

Conclusion

Timetable

Pilodyn Increment borer

Ash content

Preparations

Desalination

Impregnation

Future steps

Brede Værk, Denmark

SETTING SAIL: Understanding wood

MATERIAL CONDITION ASSESSMENT

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Pilodyn measurements

Density of the wood

Conservation plan

Excel spreadsheet

Ash content

Increment borer

THE PILODYN

Metal pin of 40mm

Measuring depth of penetration 5 Measurements per plank

27 Frames

36 Planks

( ) ( )3

10001030ln7,256 cmgx +-

=r

In total 315 pilodyn measurements

DENSITY:

Gregory D. et al. (2007)

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PILODYN: Results

70% of the measured wood densities are below 400 kg/m³

Local measurements

Cumulated measurements versus density

Jensen et al. (2011), p 9 Cumulated measurments

THE INCREMENT BORER

Hollow auger bit (Ø 5 mm)

Measuring bulk density 2 measurements per plank

Dry weight/wet volume

THE INCREMENT BORER: Results

The measured wood densities are between 100 and 500 kg/m³

No density gradients

Density of planks and frames versus depth in wood

Jensen et al. (2011), p 12

ASH CONTENT

Inorganic material

X- ray fluoresence (XRF)

ASH CONTENT: Results

Sulfur (S) Iron (Fe)

Higher percentage in planks (3-18%) than frames (2-6%) Calcium (Ca)

Jensen et al. (2011), p 14

Ash content as a function of depth in the wood

STRUCTURAL CONDITION

Determining the mechanical damage (cracks,…)

Registering the preservation circumstances

K1-511

9 20 cm

1 27cm 2 111cm

4 72,5 cm 5 57 cm

Veel Fe uitbloeiïngen bij nagelgaten

3 Vezelig oppervlak 10 zijkant is schilferig

382 cm 7 nieten 35 cm 4 cm

CONSERVATION PLAN

1. Desalination

2. Impregnation of wooden fragments with PEG 2000

3. Cleaning after impregnation

4. Original shape

5. Support frame

6. Reconstruction

7. Surface treatment

8. Controlled drying

CONSERVATION PLAN

Warehouse SUEZ

Good location

5500 m³

Antwerp

CONSERVATION PLAN

Containers

Warehouse SUEZ

CONSERVATION PLAN

7 Climate boxes

Containers

Warehouse SUEZ

PLAN OF CONSERVATION

DESALINATION

Fe, Ca, S

5% PEG 400 + 5% Sodium dithionite + 2% diammonium citrate (Richards et al. 2011)

diethylene triamine pentaacetic acid (DTPA) (Phillips et al. 2010)

Greensand

Optional treatment

Demineralised water

Eco friendly No chemical reactions

Cheaper Small workload

Available

Sugested products:

(Dastlik , Manuscript in preparation)

Safe

CONSERVATION PLAN

IMPREGNATION

PEG 2000

Stable temperature (20°C)

Increasing concentration (10% -> 85%)

PLAN OF CONSERVATION

Support frame

Reconstruction

Future steps:

Original shape

Surface treatment

Cleaning after impregnation

Controlled drying: 85% -> 50% RH

A brand new museum…

TIMETABLE 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2032

Research archaeology and registration

3D model

Desalination

Support frame

Making the molds for reshaping of the wood

PEG 2000 impregnation upto 50%

PEG 2000 impregnation upto 85%

Cleaning surface

Reshaping of the wood and reconstruction

Surface treatment

Controlled drying upto 50% RH

Archaeology

Reconstruction

Conservation

CONCLUSION

Conservation facility

Desalination was started

Conservation plan

Preparations for PEG 2000

Condition assessment

Never ending story…

Thank you