Rehabilitation of Hala Sultan Tekke Mosque Part 4

8/8/2019 Rehabilitation of Hala Sultan Tekke Mosque Part 4

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CENTRE FOR CONSERVATION & PRESERVATION

OF ISLAMIC ARCHITECTURAL HERITAGE

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85, Ramsis Street, Cairo, 11511 EGYPT - P.O. Box: 764 Cairo - Egypt Tel.: (202) 5776122 / 5752495 Fax.: (202) 5748872

E-MAIL ADDRESS: info@ ciah.biz http:// www.ciah.biz

Associated institute, ICOMOS Associated institute , Organization of Islamic Capitals & Cities

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• Extra care should be taken to capture and remove all washing and rinse water before it is

absorbed into the walls.

•Cleaning using de-ionized distilled

water under normal pressure

•Cleaning using de-ionized distilled

water and soft brushes

•Cleaning using Triton X-100 and

Phosphoric brushes

•Portico external wall after cleaning. •Applying pads of Triton X-100

(octlyphenoxyethoxyethanol) on portico external wall.

•Applying pads of Graffiti Gone- Step 2 on marble

column, painted green in the mosque •Marble column after removing paint





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•Marble plate after cleaning •Applying pads at the marble plate

•Applying pads of Triton X-100 (octlyphenoxyethoxyethanol)

on marble column inside the mosque.

Microblasting

These methods could be successful when usingsoft abrasive powder applied by well trained

technicians to gain full control of the cleaning and

its depth, where the utmost caution is necessary.

The method is also well suited for cleaning pre-

consolidated stone.

Historic Building, Germany During cleaning using microplasting

Notre Dame De Paris Recently cleaned using microplasting

Notre Dame De Paris, After 2 years, resulted severe

surface deterioration





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1.2 Desalination:

Treatment For Salt-Contaminated Masonry With Clay Packs:

• Clays make very efficient poultices for reducing the amount of salts.

• A 50 micron attapulgite or sepiolite clay powder is added to enough clean water to produce athick, sticky cream (the water should not be added to the clay, because a lumpy paste will be

produced).

• The poultice may be effective within a few days, but it may need to be left for several weeks.

The render should have open texture and rough finish to increase surface area.

Attabulgite: Fibrous clay mineral; hydrous magnesium and aluminum silicate

Sepiolite: Fibrous clay mineral; hydrous aluminum silicates, principal ingredient of China clay

(Kaolin)

Desalination using attapulgite poultices

Treatment For Salt- Contaminated Masonry With Sacrificial Render:

• The surface should be scraped down after rendering

with fine teethed edge of a hacksaw blade; this is

carried out after surface has begun to stiffen.

• Treatment should be repeated as one render coat may

be insufficient to reduce salt content to a safe level.

• Before applying the second coat, the first coat should be carefully removed and wall rewetted.

• Leave the coats for several months as sacrificial (lime:

sand) renders are relatively slow method of masonry

desalination. Removal of attapulgite poultices

1.3 Stone Replacement:

• Decaying stones which have a structural role and on which the stability and survival of the

stones or other elements of the structure depend have a clear priority for replacement almost

regardless of their intrinsic value.





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Stone Cutting Stone Dressing Stone Replacement

Adhesives and pinning

• Sometimes new stones, or new stone facesmay be secured with epoxy adhesive.

• A typical example of this is the halving of

decayed mullions, where the decayed stone is

cut back and half mullions glued to the face of

the surviving internal half.

• Excellent as modern resin adhesives may be it

is always unwise to rely on the interface bond

alone.

• The halving technique relies, on dowel pins of Titanium or Teflon bars. Stone facing fixation,

using dowel pins of titanium or teflon bars and epoxy

• Spalls and missing parts can be built up phosphor bronze wire and matching mortar.

• The use of pins and epoxy mortars has enabled valuable masonry features, shattered to be

saved, which otherwise would have been lost.

1.4 Plastic Repairing:

• Plastic repairs are of a particular interest and importance to

conservators because the technique frequently permits the

retention of more original material with much less disturbance

than would be possible for the execution of conventional

masonry repairs.

• The repair must be prepared as samples on a piece of stone, not

in a wooden mould, and judged on the dry and wet appearance.

• Plastic repairs should always be carried out by a stone mason or

stone conservator.Plastic Repairing

National Theater – Berlin - Germany





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1.5.Consolidation:

• Modern conservation techniques aim at consolidation of the stone, which in this connection

mainly means replacing the binder that has been lost by weathering.

• A good consolidant for stone. It should penetrate, be strong enough to join the stone and must not

react with acids.

• The consolidant should allow the stone to breathe

in order to allow moisture to pass. No changes of

the colour of the stone are allowed and it is even

desirable that the consolidant should be invisible

after treatment.

Stone sample before treatment

Stone sample after treatment with Wacker strengthener

• As with all methods of conservation there is an ultimate requirement that the method used

should comply with the demand of minimum intervention and be reversible.

• A variety of consolidants for stone have been tested both in laboratories and in practical

treatment, Wacker silicones (Wacker OH 100 stone strengthener based on ethyl silicate) seem

to give the best results hitherto, It has good penetration and give good mechanical strength to

the stone as it forms a mineral binder (silica gel binder SiO2) that is compatible with the stone

material.

Absorption measurement using Karsten Tube before and after treatment with water replant







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3.Joints Pointing & Repointing:

General:

• As a general rule joints should be cleaned out to a minimum depth of

25 mm (1 in) and never to a depth less than their width; but wide

joints, especially those liable to exposure to extreme weathering,should be cut out to a minimum 38 mm (1½ in) or even 50 mm (2 in).

• Sometimes the mortar has disintegrated to such an extent that the

joints are largely empty, in which case they must first be deep tamped

and, if necessary, hand grouted to fill the joint to the required depth

for pointing. If tamped or grouted mortar comes closer to the face

than 25 mm-38 mm it must be cut back to the proper depth and to a

square face before pointing.

3.1.Raking & Cutting Out The Joints: • Raking out may be a simple operation without risk

to the fabric where mortar is substantially decayed,

but it is over-simplifying the situation to say that the

joint does not need re-pointing if it requires cutting

out. • The empty joint at the face may be too much of a

risk to leave alone, and additional cutting out may be

necessary to achieve enough depth for pointing.

• More often, cutting out (as distinct from raking out

with a knife blade or bent spike) is necessary toremove dense re-pointing of an earlier period,

especially where this mortar -fortunately usually

shallow in depth- is causing problems because of its

high strength, impermeability and tendency to trap

water behind it and accelerate the decay of stones.

• All Cutting out should leave a clean, square face at the back of the joint to provide optimum

contact with the new mortar. Time for cutting out, which may be considerable, must be

properly programmed.

3.2. Filling The Joint:

If the joints have dried out after cleaning they must be re-wetted before placing the new mortar.

The mortar is pushed into the joint from a board and ironed in with the maximum possible

pressure.





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• Pointing trowels are in common use, but it

is regrettably unusual to see pointing keys,

which can be improvised to suit the

particular work in hand. These may be

cranked bronze or steel fleet, or beaten out

rod or even wood. The mortar must

subsequently be packed with a pointing

key.

• The function of these keys is to push the

mortar evenly into the joint for the full joint

width; this they can do because they fit into

the joint and do not try to achieve

compaction from the surface alone.

3.3.Filling Fine Joints:

• Injection grouting of these joints is notoriously difficult, as the grout tends to disappear without

any effect into the wide, open joints behind the face.

Method 1: Putty Sandwich Method 2: Taping and Pointing Method 3: Mortar Injection

4.Treatment Of Algae, Lichens And Mosses:

• Sources of nutrition for organisms-such as dust, deposits of various organic substances, bird

droppings, and unsuitable restoration materials must be removed from stone surface.





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• Periodic cleaning as a preventive conservation

measure is the principal and sometimes only way

to prevent and control biological attack in outdoor

environments.

• It has been found effective in controlling

establishment of mosses, lichens, fungi, algae and

higher plants by discouraging the accumulation of

wind borne spores and seeds of plants and their

subsequent germination.

• Partially removing of biological growth before

applying biotical agents is usually recommended.

• Mechanical methods are favored for removing

biological growth, as they eliminate the danger of

leaving behind unwanted substances on the stone.

Biological growth

(Algae, mosses, lichens and fungi)

Biological growth (mosses colonization)

4.1 Biocides:

• Biocides refer collectively to bactericides, fungicides, algaecides and herbicides. They are

normally used to eliminate and inhibit biological growth ( lichens, algae and mosses).There are

numerous ready-made chemical cleaners available on the market, but before using any of these

it should be verified that there is no risk of damage to the actual stone object to which they are

applied.Only well known products should be used as the damage caused by some substances

might be detected only after a long time.

• Treatments have also been carried out using biological packs covered with polyethylene

sheeting.

• These chemicals, however, are also potentially harmful to wildlife and humans.

• For this reason, there is a mandatory need to identify and disclose the toxicological properties

of biocides. The most common indices for quantifying toxicity are LD50 (Lethal Dose 50 %)

and LC 50 (Lethal Concentration 50 %).

• Mechanical methods are favored for removing biological growth, as they eliminate the danger

of leaving behind unwanted substances on the stone. Toxic values Oral LD50 Dermal LD50 Inhalation LC50

Very Toxic 0- 50 0- 200 0- 2000

Moderate Toxic 50- 500 200- 2000 2000- 20000

Slightly Toxic 500- 5000 Greater than 2000 Greater than 20000

* Normal Asprin has oral LD50 of 1375

• The biocides for treatment of masonry covered with algae, lichen, mosses and small plants is

based on a quaternary ammonium compound effect the initial bill, and when combined with

tributyl-tin oxide will have long term inhibiting effect on recolonization.





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• By handling and mixing biocides, worker should wear rubber gloves; when spraying he should

wear safety glasses, mask and goggles. 5.Treatment Of Soil Against Termites:

•

Soil poisoning is only the first line of defense against termites attack.• Dielrin, Aldrin and Chlordane have been found suitable.

• Foundation should be exposed and the earth should be poisoned as it is replaced with the refill

new soil mixed with the biocide material.

• The bottom of the trenchs should be poisoned by injection under pressure through drilled holes

to the depth of 50 cm at least and distance between holes of 30-50 cm.

6.Repairing Of Metals Elements

6.1.Cast Iron/ Wrought Iron

• Corrosion of iron is the formation of Iron Oxide (rust) by

the reaction of iron with oxygen and water.

• Application of paint is the most practical method of

protecting iron.Cast iron and wrought iron is of intristic

value and is preferable to repair than renew.

Mechanical cleaning:

• This process involve the power–driven tools

such as grinders and rotary wire brushes.

Needle guns can be used successfully to

remove the rust and scale and can reach into

awkward corners and angles inaccessible to

other equipment.

• It is advisable to start at a pressure of 40 psi

(6 kpa) with copper slag; satisfactory

cleaning pressure should not exceed 60-70

psi (8-10 kpa).





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Acid Pickling

• This process involve immersing items in a

bath of warm diluted phosphoric acid to

remove mill seal and rust.

• The reaction with iron results is a protective

layer of phosphate on the surface (anodic

inhibitors)

Repairs

• Corroded ends can be tipped with stainless

steel, delta bronze; for distance of housing at

least 12 mm from masonry face.

•

Embedded parts into pillars should be painted with epoxy resin. To replace loss of

thickness, use a filler based on steel particles

with an with epoxy resin.

Painting with protective paint • Selection of the protective system should consider the historic and archaeological value of the

existing coating, the method of preparation, difficulties of maintenance.Surface should be dry,

to achieve satisfactory results in protecting internal and external iron work, a total film

thickness of 125-250 microns, two coats of primer and 4 coats of air dry paint (alkyd resin

paints) are recommended if they are applied to a rust and scale- free surface. 7.Removing Old (non historic) Paints From Wooden Surface:

• Using the brush, a thick layer of methylene chloride paint could be applied to the wooden

surface.

• After five minuets, the old paint could be removed using scraping tool. For better results the

previous step could be repeated for several times until the old paint is removed completely.

• To have a clean surface free from residue, fine sandpaper can be use parallel to wooden fibers.

8.Cleaning Of Wooden Elements:

• Stained or dirty wood work can be successfully cleaned by

removing all dust and dry dirt by vacuum cleaner, scrubbing

with natural PH soap and warm clean water.

• Old varnish can be removed using solvent made up from

American turpentine (not substitute) and acetone. Surface

should be washed down.

• When surface is dried, a thick protective coat made up from

microcrystalline wax and preservative (natural turpentine)

should be applied, to be rubbed down with clean soft cloth.





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9.Treatment Of Wood Against Termites:

• All wooden elements to be treated against termites

by brushing with proposed material to penetrate in

soft wood 2- 4 mm.

• Wooden batten on wall plinth and ground

(flooring), wood board for flooring and for timber

in contact with the walls or the ground to be treated

by Pressure Creosote in accordance with BS 913;

1972 or Dursban 4 TC.

10.Artificial Lighting:

• Artificial lighting for historic buildings introduces new aesthetic and technical problems. Apart

from visual effects, it effects the internal environment by radiation and heat input which, if

high, can have undesirable side effects such as timber shrinkage and may even extreme case

can be cause of the out break of fire.

• To maintain suitable low levels

of light and reduce danger of UV

rays, it is recommended to use

artificial light, in our case; a

medium chandelier is enough to

light the praying hall to the

height of 3.5- 4.0 meters from

flooring level.

• It is also recommended to use

dimmers, which run bulbs at a

lower output until their fullcapacity is required.

‘Umayyad Mosque Ba’alabeck - Lebanon

A specialized company will be consulted to propose a complete project for suitable electrical

systems and aesthetic lighting for Tekke mosque outdoors.





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Farm house- Riyadh - KSA

Typical Ottoman Chandelier

11.Lightning Protection:

• The possibility of a Lighting strike to the structure

of a building such as a small mosque or church is

much greater, at around 1:500 per year. Electricalcircuits may also be damaged by the electo-

magnetic field generated. The effect of a lightning

conductor placed appropriately on any building is

to create an 'apparent earth' short circuiting the

intense electric field below a thundercloud. This

allows positive ions to be transferred through the

conductor to the atmosphere, as an upward

streamer.

Proposed Lightning system for the Tekke mosque

Maintenance Programme:

Introduction:

• The maintenance programme is aimed at keeping the cultural resources in a manner that will

prevent the loss of any part of them.





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• It concerns all practical and technical measures that

should be taken to maintain the site in proper order. It

is a continuous process, not a product.

• Maintenance should use natural forces to enhance the

beauty of the cultural resource, but over-maintenance

can destroy its beauty.Maintenance planning is an artwhich needs cultural and ecological sensitivity.

• Climate and the causes of decay control the appropriate degree of maintenance, together with

the users' needs, but maintenance policies and programmes should also take into account the

specific nature of every culture, aiming at a balance with natural forces.

• A maintenance programme should follow well-established

cycles describing who does what work, how this work is done,

and how frequently. It should describe the actions in simple

terms that can be implemented by cleaners, crafts persons,

supervisors and all other individuals involved in the upkeep of

the cultural resource.

• The implementation of the maintenance programme is followed

by its re-evaluation based on results and time expended.

• Detailed descriptions of accurate hours worked and materials

used are essential; traveling time should be kept entirely

separate.

• Tasks should be clearly described so that outside workers can

bring all the necessary tools and consumable supplies to the site,

avoiding time wasted on abortive journeys.

A good maintenance strategy can prevent a great deal of damage and decay, and thus save money.

Unfortunately, it is difficult to quantify these savings, and, as a result, those administering cultural

heritage too often see only the cost of the professional service and are tempted to economize

unwisely in this field.

Stone Visual Deterioration Maps:





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• Stone Visual Deterioration Maps of the existing situation were carried out by CIAH.

Rehabilitation Work Plan:

A- Structural Works:

1. Dismantling floor tiles outside and inside the building.

2. Dismantling wooden floor boards, battens and wooden plinth on walls and columns.

3. Dismantling roof screed (mosque and mausoleum).

4. Dismantling roof tile, palm leaves and D.P.C.

5. Dismantling window metal screen and lattice.

6. Dismantling wooden doors, windows leaves and windows shutters.

7. Removing new plaster from pillars inside mosque/ deteriorated plaster from mosque and

mausoleum walls.8. Excavation of soil inside and outside the building.

9. Injecting soil and foundation’s walls with termicide.

10. Grouting of foundation walls, cleaning and repointing of

joints.

11. Execution of rain water collection project.

12. Refilling inside building and repaving with Cyprus marble

tiles.

13. Dismantling additional outside wall in transition zone on thesouth and west Mosque’s walls.

14. Reconstructing portico’s roof.

15. Installing of roof rain metal gutters.

16. Laying new screed roofs and dome’s surfaces.

17. Reconstructing stair flights as original on the south and west

side of the mosque transition zone after cleaning and

repointing of original walls and finally treatment with

strengthening and water repellent material.

18. Paving outside walk with lime stone tiles- Paving portico and

ambulatory around mausoleum with Cyprus marble tiles.





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B- Restoration Works:Stone Repairs:

1.Cleaning all stone and marble surface; (mosque and mausoleum).

2.Treating with fungicide where necessary.

3.Desalinating all wall surfaces.

4.Repointing joints where necessary.

5.Treating stone surface- inside and outside- with strengthening material.

6.Treating stone surface columns, pillars- inside and outside – with water repellent material.

II- Wood Repairs:

1. Removing modern paints from wooden structural elements, windows and shutters, wooden

doors mezzanine, and screen around mausoleum.

2. Treating of all wooden structural elements, wooden windows leaves and shutters, wooden

doors, wooden mezzanine and wooden screen around mausoleum with termicide.Repairing

where necessary.

4. Dying of wooden structural elements,

wooden doors mezzanine, wooden stair

flights and wood screen around

mausoleum shutters and leaves.

5. Painting all wood work with teak oil.

6. Rehousing of all wooden elements.

III- Plaster Repairs:

1.Cleaning plaster surface from new paint.

2.Plastering repair where hollow area exists.

3.Providing new plaster in areas defined by conservation architect.





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IV- Iron Repairs:

1. Removing paint from iron fence, iron screens, iron lattice and iron structure ties.Cleaning all

iron elements.Surface treatment against rust.Repairing where necessary.Painting all iron

elements with protecting paint.Rehousing of iron elements.

V- Fine Restoration:

1. Wooden minbar

2. Wa’z wooden stool

3. Stone Mihr ā b

4. Inscription plates

(inside- outside mosque)

It is obvious that preservation, conservation and restoration operations need a high scientific

experience which should be available in the Arab region to safeguard the cultural heritage of the

Arab nation and to take part in the sustainable development strategies for the benefit of the Arab

societies.

Therefore I recommend the following:

1. To improve the traditional handcraftsmanship and to establish specialized Centers for the

conservation of cultural heritage.

2. To establish courses on conservation and restoration of cultural properties for undergraduate

and graduate studies at Arab Universities.

3. To activate the cooperation with the centers of Conservation at foreign universities and

International societies and centers to get acquainted with new scientific approaches in the field

of conservation and restoration.

4. To establish a regional scientific center in the field of conservation, preservation and restoration

of Arab Cultural properties connected with the information network of other International

Centers.

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Rehabilitation of Hala Sultan Tekke Mosque Part 4

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