A. STRUCTURAL REPAIRS TO BEAMS, COLUMNS, SLAB SOFFITS AND CHAJJA ETC.

1. Break the old loose concrete up to reinforcement & cart away the debris to a safe place as directed by the Engineer in charge.
2. Clean the reinforcement mechanically by wire brush / sand paper, and light tapping with a hammer to remove loose scales and later wash with water.
3. Tie / weld new reinforcement in places where the old reinforcement has reduced to more than 25%.
4. Apply Perma Rust Remover (Converter) to the exposed reinforcement with the help of a brush/ cotton waste. After 4 to 5 hours of application of Rust Remover clean the reinforcement once again with a wire brush or sand paper so as to remove traces of loose scales (never use water for cleaning after rust remover has been applied).
5. Mix Perma Bond SBR / Perma Bond AR and Cement in the ratio of 1:1 by volume and apply the slurry thus obtained by brush over the existing reinforcement. This coat forms a passivator coat over the steel reinforcement.
6. Mix Perma Bond SBR / Perma Bond AR and Cement in the ratio of 1:1 by volume and apply this slurry by brush over the reinforcement and the neighboring concrete, which are to be treated with SBR Polymer Mortar / Perma Bond AR mortar. This second coat on the reinforcement and first coat on the neighboring concrete applied just before the application of modified mortar forms the bond coat
7. When the bond coat is tacky i.e within 10-20 minutes hand pack / press in position Perma Bond SBR / Perma Bond AR Polymer Mortar to a thickness of up to 20 mm in one layer. The mortar prepared using the following proportions forms the polymer modified mortar.
   50 Kg. Cement
   130 Kg. Zone II dry sand.
   10 Ltrs Perma Bond SBR or Perma Bond AR
   8 to 10 Ltrs Water
   Yield 0.1 Cu. Mtr or 100 Ltrs.
8. Mechanically scratch the Polymer Mortar within 60 minutes of this application, to create a mechanical key to receive further finishing or dressing mortar. For additional thickness to be built up repeat procedure 6 and 7.
9. Follow up mild curing in the form of mist spray for one day and then allow it to dry off.

B. REPAIRS TO DAMAGED BEAMS AND COLUMNS USING SUPER FLUID MICRO-CONCRETE.

1. Remove all loose aggregates from the soffit of the beam till a sound concrete surface is obtained. Clean the reinforcement with wire brush sand paper etc. Treat the reinforcement with Rust Remover / Converter and clean the steel after 3 to 4 hours thoroughly with sand paper and thereafter avoid the contact of water with the cleaned steel. Apply passivator coat of SBR / Perma Bond AR obtained by mixing it with cement (mixed in the proportion of 1:1 by volume)on all reinforcement.
2. Fix leak proof shutters sealing the ends and the junctions with water tight packing materials such as masking tapes etc. Mix Perma Recrete with water to form flowing consistency slurry and pour this in the shutter while tampering with rods to ensure effective filling. If the area to be jacketed is large, then 10 mm and down aggregates can be mixed with Perma Recrete in the proportion of 1:1 by volume to achieve economy.
3. Remove the shutter after 48 hours to get a sound and strong rebuilt concrete surface.
4. Fill up the step / offset thus created by plastering so that the whole surface becomes even.

C. SEALING OF PLASTER CRACKS & FILLING OF JOINTS IN BETWEEN RCC COLUMN & MASONARY WORK.

1. All cracks to be opened to a ‘V’ shaped groove 10 mm wide and 10 mm deep and thoroughly cleaned with water.
2. Mix Perma Crackfill a non-shrink Hi-Strength polymer mortar with water in the proportion of 3.5 volume of powder to 1 volume of water to obtain an uniform consistency homogenous paste. Fill up the grooves with this paste effectively to an uniform smooth finish.
3. Follow up mild curing with mist spray of water for one day and then allow the treatment to dry off.

D. EXTERNAL / INTERNAL PLASTER

1. For providing and applying external / internal cement plaster to brick masonry or concrete surface of wall, columns, beams etc. In cement sand mortar 1:4 add an integral waterproofing compound such as Perma Trik at a dosage of 500 gms of Perma Trik powder to a bag of cement or use a liquid integral waterproofing compound such as Plast – O – Proof at a dosage of 100 ml of the liquid to a bag of cement. Use this mortar for all plastering / rendering work.
2. Cure the plastered area with water as per usual practice.

E. WORKABILITY AIDS FOR CONCRETE

1. All concrete of specified grade as approved by the consultant shall be dosed with a water reducing plasticizer such as PERMA Plast / Perma Plast EX at a minimum dosage 200 to 400ml of plasticiser in a concrete of one 50 kg bag of cement depending upon the type of concrete.
2. Cure the concrete with water as per normal practice.

F. ADMIXTURE FOR HIGHER GRADE OF CONCRETE.

1. All concrete above M-25 shall be admixed with a naphthalene based plasticiser PERMA Plast Super / Perma Retard @ 200 ml to 500 ml / 50 kg bag of cement depending upon type of workability required and the final strength desired. W/C ratio not to exceed beyond 0.44.
2. Cure the concrete with water as per normal practice.

G. WATERPROOFING OF TOILET SLABS AND BATHROOM.

SUNK SLABS

All sunken portions of toilets and bath rooms shall be thoroughly cleaned make good honey combing, cracks etc with suitable SBR modified mortar on SBR cement primer or PERMA CRACKFILL or PERMA SEAL modified mortar. Close all cut outs pipe runs etc with fresh concrete admixed with water reducing admixture and allow them to harden for at least 10 days.

Thoroughly saturate the entire surface with water and remove any stagnant water. Apply two coats as PERMA SEAL slurry with brush the second coat being applied when the first coat is still tacky. Plaster the entire surface when the second coat is still tacky etc. complete in all respects.

1. Clean the existing concrete free of all loose particles.
2. Cracks if any found on the concrete to be raked to a ‘V’ shape groove 10 mm wide and 10 mm deep. Clean the grooves and wash them thoroughly.
3. Brush - apply Perma Seal slurry (two and half volumes of Perma Seal powder mixed with one volume of water) in the groove in two coats.
4. When the Perma Seal slurry coat is still tacky fill up the grooves with Perma Seal modified mortar (1 part Perma Seal, 1part Cement and 4 part Sand by volume and water to get desired consistency infill mortar)
5. Moist cure the treated area for 2 days with water mist or wet hessian.
6. All along the construction joints chase ‘V’ shaped grooves and fill them up with Perma Seal modified mortar as explained above and moist cure the same with water.
7. On completion of this repair work saturate the entire concrete surface with water sufficiently so as to allow for the water to penetrate in the capillaries.
8. Subsequently remove all excess water and brush - apply two coats of Perma Seal slurry on the water saturated surface. The second coat being applied when the first coat is still tacky.
9. Cure the treated surface with water for 6-7 days. Alternatively if the treated surface is going to receive brick bat infill, or any subsequent treatment, then sprinkle dry cement and Coarse sand on the Perma Seal slurry coat when it is still wet to create a mechanical key..

TENDER SPECIFICATION

Providing and installing proprietary crystalline waterproofing system to inside surface of the sunk slab in two coats after due surface preparation including ‘V’ groove at junction joints and pressure grouting where required as per manufacturers literature etc. complete in all respects.

H. POLYMER MODIFICATION TO IMPART WATERPROOFING QUALITIES TO WHITE CEMENT PAINT / COLOURED CEMENT PAINT

1. Mix Perma Shield a hybrid Acrylic Polymer to white cement / coloured cement paint in the ratio of 5 Ltr to a 50 kg. bag of white cement / coloured cement paint.
2. Add additional water as per requirement to achieve brushable consistency paint.
3. The resultant slurry is applied with a painter’s brush in one or two coats depending up on requirement.
4. Cure as per normal practice.

I. PROTECTION OF CEMENT PAINT FROM FUNGUS AND ALGAE GROWTH.

1. Apply cement paint as per desired colour to the plastered surface as per manufacturers recommendation.
2. Cure the painted surface with water and allow for drying of the paint to take place naturally.
3. On a totally dried painted area spray apply / brush apply Perma Treat / Perma Treat - WB a colorless solvent / water based Silicon water repellant liquid in one coat making sure that the liquid runs down at-least 200 mm on the surface under treatment.
4. Allow for air curing and protect from water for a period of 72 hours after application of the coating.

J. TERRACE WATERPROOFING.

I. NEW CONCRETE ROOF SURFACE:

• Clean the surface to remove all loose practices, traces of oil grease to make a sound surface visible.
• Repair any cracks on the surface by making a ‘V’ shaped groove and fill the groove with Perma Crackfill.
• Mix the liquid and powder components of Perma Guard in the proportion 1:4 as specified in the literature to form a homogeneous slurry.
• Brush apply this slurry on the roof surface with a brush. On the tacky coat cover the surface with cement sand screed & cure normally.

II. FOR OLD ROOF:

• Clean the existing tiled / brickbat coba treatment free of all loose particles, vegetation growth etc.
• Surface repairs if any be carried out with Perma Bond SBR modified mortar system followed by surface grouting or regular injection grouting system.
• Brush apply Eazee Coat to an even thickness. While the first coat is wet spread Nylon mesh making sure that the Eazee Coat is saturated thoroughly.
• Apply second coat of Eazee Coat to complete the treatment.
• Carry over the treatment to parapet walls, top & side walls for effective protection.

K. TERRACE GARDEN WATERPROOFING.

• Surface preparation to be carried out as per standard practice like repairing honeycombs, crack filling, cleaning etc. Peripheries of all the drain pipes should be raked out and back filled with Perma Seal modified mortar on two of Perma Seal slurry as primer.
• Apply two coats of Perma Guard and cover it up with cement sand and provide smooth finish. Screed should be laid in panels not exceeding 3 mtr X 3 mtr providing chicken mesh at all construction joint. Cure for seven days.
• Saturate the screed with water and apply two coats of Perma Seal Slurry and again cover it up with cement sand screed and cure normally.

L. BASEMENT WATERPROOFING

The following aspect requires to be taken care while taking up basement waterproofing.

1. QUALITY OF CONCRETE:
   If the concrete is honey combed it needs to be repaired by injection grouting followed by surface repairs. The construction joints specially need to be thoroughly injection grouted before taking up the waterproofing treatment.
2. STRUCTURAL JOINTS:
   If the dimension of the member to be treated is more than 25 meters in any direction proper control joints such as ‘Crack Inducer Joints’ and ‘Expansion Joints’ should be provided or else no water proofing treatment can be successful. Control joints are structural design features and beyond the scope of this specification.

SPECIFICATION

1. Prepare the surface treatment as per standard practice.
2. Injection grout the construction joints with nipples fixed at an interval of 75-80 cms centre to centre. In case of porous concrete fix the nipples at 50 cms centre to centre.
3. Cut a ‘V’ shaped groove along the construction joints about 5 cms wide and 2 cms deep.
4. Saturate the side of the groove with water and apply two coats of Perma Seal slurry and immediately fill these grooves by Perma Seal modified mortar. Perma Seal modified mortar is prepare by mixing Perma Seal, Cement and fine sand in the proportion of 1:1:4 and water to make the mix of a workable consistency.
5. When the modified mortar has set saturate the whole surface with water, apply two coats of Perma Seal slurry and immediately cover it up with cement sand mortar and cure normally.

M. DAMP PROOF TREATMENT FOR EXTERNAL WALLS

External walls could be of RCC, Brick work or Block work

I. RCC WALLS:

RCC walls have fair finish and need only application of paint. Application of render or putty is ruled out as on the continuous smooth wall surfaces adhesion of these products is difficult and hacking of the surface is ruled out.

The paint selected should be heavy duty acrylic and shade selected shall be UV resistant and the paint itself shall be alkali resistant to tolerate the alkalinity of RCC surface which is much more alkaline than the plastered surface. The selected paint shall be applied in two coats, the first coat being primer prepared by diluting the paint with 25% of water and the second coat being applied neat.

TENDER SPECIFICATION

All external RCC walls shall be thoroughly cleaned to remove the stains and remains of any mould release agent, loose particles and washed clean. An acrylic heavy duty paint which is alkali stable and resistant to UV rays be applied in two coats. The first coat being primer prepared by diluting the paint with 25% of water and second coat being applied neat. The paint shall be ‘PERMA WALL GUARD of M/s. Perma Construction Aids Pvt. Ltd or equivalent. The rate quoted shall include providing and application of the paint after thorough surface preparation including scaffold all tools and tackles etc

II. WALLS WITH BRICK WORK

The weak areas in the brick work are the junction of brickwork and column and brickwork and soffit of the beam. Before commencement of the plaster rake out the vertical joints between the column and the brickwork / brickwork and the soffit of the beam, fill this up with PERMA CRACKFILL paste. After these joint fills have set and hardened, plaster the surface providing a dip or grove in the plaster obtained by pressing a pipe in the render when it is still wet. The location of these drips or grooves shall be such that they run along the centre of the beam and along the column centers. These grooves act as crack inducer joints and the stresses developed due to shrinkage are allowed to form cracks in this groove keeping the centre panels of the wall crack-free and there by waterproof.

TENDER SPECIFICATION

All external wall areas at the junction of brickwork and column and brickwork and soffit of the beam shall be raked with a pointer of the loose mortar and the same area be filled with non-shrink repair mortar PERMA CRACKFILL. All plaster mortar on the external wall surface shall be carried out in 1 : 4 cement sand mortar admixed with an integral waterproofing compound PLAST-O-PROOF @ 100 ml / 50 kg bag of cement. The surface plaster shall be provided with a drip / groove by pressing in a pipe when the plaster is wet at the centre of the beam and along the column centers.

III. WALLS WITH BLOCK WORK

The weak portion of the wall which is responsible for the dampness is the block itself as it is made with very economical quality of sand and grit and just minimum quantity of cement. For damp proofing the external walls the external plaster should be provided with drip or groove as explained above. The entire surface should be painted with heavy duty acrylic paint such as PERMA WALL GUARD. Alternatively if the external wall surface is painted with cement paint it should be treated with solvent based water repellant such as PERMA TREAT.

TENDER SPECIFICATION

All plaster mortar on the external wall surface shall be carried out in 1:4 cement sand mortar admixed with an integral waterproofing compound Plast-O-Proof @ 100 ml / 50 kg bag of cement. The surface plaster shall be provided with a drip / groove by pressing in a pipe when the plaster is wet at the centre of the beam and along the column centers. An acrylic heavy duty alkali resistant coloured paint PERMA WALL GUARD shall be applied in two coats. The first coat being the primer coat diluted with 25 % water and the second being applied neat.

N. RISING DAMPNESS IN THE WALLS

For arresting the rising dampness in the walls we need to provide DPC. With the chemicals it can be achieved as follows:-

Before laying the brickwork saturate the RCC slab with water along the length of the wall and apply two coats of PERMA SEAL SLURRY. When the second coat is still wet set the first course of bricks and thereafter the second course of bricks is PERMA SEAL modified mortar prepared by mixing PERMA SEAL, Cement and Sand with proportion of 1: 1: 4 and water added for desired consistency.

Note: Kindly refer relevant technical literature for details on the respective products mentioned in the above specification. The specifications are given as a general guideline for the purpose of understanding. The specifications could vary depending upon the problems encountered

O. Waterproofing on existing IPS / China Mosaic Flooring:-

1. Remove the entire IPS from the roof slab and the parapet wherever possible because of discontinuity and thoroughly clean the surface.
2. Saturate the brick bat coba on the slab along with exposed parapet wall with water admixed with polymer SBR in the proportion of water 3 volumes to one volume of SBR.
3. Screed the entire surface to a uniform level finish, with SBR admixed mortar prepared with following proportion. In case of increased thickness beyond 20mm then the use of 10mm aggregate be incorporated in the mix to avoid cracking of the screed mortar.
   
   Cement - 50 kg
   Sieved Sand - 200 kg
   SBR - 2 Ltr
   Water - As required
   

   The modified mortar shall be laid on a SBR bonding slurry prepared by mixing SBR and OPC in the proportion of 1 : 1 by volume and brush applied over the saturate brick bat coba surface. Cure normally and allow the surface to dry.

4. Paint 4” wide bands with Bitu Coat applied in two coats along the wide of the roof at an interval of 4 meters.
5. Apply Eazee Coat on the roof surface starting from one end till half the width of the Bitu Coat band or over lapping half of Bitu Coat band. Lay reinforcing nylon mesh on the Eazee Coat applied surface so that the nylon mesh ends at half the width of Bitu Coat band and does not prolong. Apply second coat of Eazee Coat.
6. Continue this operation making sure that the Eazy Coat form continuous layer but the nylon mesh is discontinuous over the Bitu Coat band.

P. WATERPROOFING OF BASEMENTS WITH BITUMINOUS MEMBRANES

1. Clean the PCC or the blinding concrete and lay 1 inch mortar screed on the surface and cure it normally.
2. Apply water based bitumen emulsion Perma Bitu coat in two coats as per the product specification.
3. Lay 4mm thick SBS or APP modified elasto-plastomeric prefabricated membrane composed of selected distilled bitumen modified with elastomer and plastomer polymers and reinforced with non-woven spun-bound polyester mat with high mechanical resistance, on the primed surface by torch sealing the layers with a lap of 4 inches or 100 mm horizontally and vertically, taking care to see that there are no wrinkles and the membrane is firmly sticking to the mortar screed. The screed may show shrinkage cracks but it is unimportant. The membrane shall be extended to 300 mm beyond the external line of the structural concrete.
4. Lay 1 inch thick mortar on the felt and cure normally. This mortar also may show shrinkage cracks and un-stability, it is unimportant.
5. Lay the raft and cast the retaining walls with sound concrete utilizing at least 400 kgs of cement per cubic meter of concrete, and dosing a suitable concrete admixture at a dosage of 400 ml per bag of cement. Cure the raft and the retaining wall normally. Do not allow any cutouts or holes in the retaining wall below three feet from the ground level.
6. Take out the mortar from the membrane from the periphery of the retaining wall and build 4”x4” chamfer around the retaining wall in cement mortar on the extended bituminous membrane and clean the surface.
7. Apply two coats of water based bitumen primer such as Perma Bitu Coat on the extended felt, the chamfer and the exterior surface of the retaining wall as per the product specification and install the membrane on the wall torch-sealing the joints with a lap of 4 inches.
8. Install 4 inch thick brick wall along the retaining wall sandwiching the bitumen membrane and back fill the excavation by compacting suitably.
9. Saturate the inner surface of the retaining wall and the floor with water and treat it with two coats of Perma Seal immediately followed by render coat of dash plaster in accordance with the product specification.
10. After plastering the internal surfaces are ready for the requisite finishes.

COVERAGE OF BOND SBR / BOND AR / LATEX SBR FOR CORROSION INHIBITING COATING ON STEEL REINFORCEMENTS

DIA OF STEEL mm	PERIMETER CMS	SECTIONAL AREA CM2	LENGTH OF STEEL PER TONNE	SURFACE AREA IN MTR SQ / TONNE	SURFACE AREA IN SFT / TONNE	SBR / AR / LATEX REQUIRED IN LITRES PER TONNE
8	2.51	0.503	2535	63.63	685	11.42
10	3.14	0.786	1622	50.93	548	9.13
12	3.77	1.131	1127	42.49	457	7.62
16	5.03	2.011	634	31.89	343	5.72
20	6.29	3.143	406	25.54	275	4.58
25	7.87	4.911	260	20.44	220	3.67
32	10.06	8.045	158	15.9	171	2.85
40	12.57	12.571	101	12.7	137	2.28

NOTE :

Density of steel is 70843 Tonnes / M3

Passivator coat is prepared by mixing Perma Bond SBR / Perma Bond AR with cement in the proportion of 1:1 by volume or 1 : 1.47 by weight

Wet film thickness of coating is 143 microns where as the dry film thickness will be 100 microns

Theoritical coverage of Perma Bond SBR / AR on steel surface is 60 SFT without considering wastage.