SPECIAL REPAIRS TO BUILDING NO P-341 (ITW BLOCK) AT STATION LONAVLA

M & L for surface preparation of all loose and de-bonded concrete/ screed, loose particles, dirt & APP membrane treatment should be removed. Roof substrates must be pressure-washed with water with a minimum working pressure of 1,400 psi to be used to and/or remove all dirt, dust, chalking and waste products. Remove algae, mold by using bleach solution or biowash. Including removal of all debris from MD land and deposited outside MD land, material to a distance n. exc 50 m and clearimg site.

M & L for mechanical cutter is used to Remove loose and damaged concrete roof screed in pockets . Clean the concrete screed with high pressure water jet to remove dirt and loose particles. Brush applies a bond coat of Dr. Fixit Pidicrete SBR mix in the ratio of 1:1 (URP 1: Cement 1) by volume to make it lump free slurry when applied on in the pre wet surface. Laid to fall roof screed in correct slope and gradient. Mix Dr. Fixit Pidicrete URP 10% by weight of cement in (M20) concrete in ratio of 1:1.5:3 i.e., one bag of 50kg cements: 1.5 times volume of sand: 3 times volume of aggregates: 25L water. Level the repair mortar and finish with trowel. Moist cure should be done for 7days. Air cure screed for 4-5 days, before application of roof topcoat coating system.

M & L for all visible hairline cracks on concrete roof screed more than 0.50 mm and not giving hollow sound, should be cut and widen in V shape with mechanical cutter in the size (8mm W x 6mm D). Fill cracks with Dr. Fixit PU sealant / Hybrid Sealant with suitable gun and smoothed with a putty knife or trowel. Allow sealant to cure a minimum (72 Hrs.) 3 days.

Hacking and chipping the surface around the rainwater drain outlet up to 25mm in depth. Apply bond coat of Dr. Fixit Pidicrete URP in the ratio of 1:1 (URP 1: Cement 1) by volume over the corners and pipe insert outlet gaps. Filling the gaps around drain mouth with (PMM) polymer modified mortar mixed with Dr. Fixit Pidicrete URP 10% by weight of cement in the ratio of 1:3. Providing & fixing 100 mm width 225-gsm g/m2 Fiberglass Chopped Strand Mat around the periphery of drain mouth of rainwater outlet sandwiched with Dr. Fixit Wonderproof 100. Apply two thick coats of Dr. Fixit Wonderproof 100 waterproofing coating to completely cover the mesh/fabric and surrounding area for rainwater outlets treatment:

Sl No 5 continued:- The material has followed technical properties: Attains a Tensile Strength ≥ 18 N/mm2 as per ASTM D 2370; Crack bridging ability, Tear Strength ≥ 160 N/mm as per ASTM D 624, Dynamic Crack bridging as per EN 13251:2016 - No Cracks after 20000 sinusoidal cycles, Dynamic Crack bridging as per ASTM C 1305-2016 - Pass, No Crack, Pass Low Temperature Flexibility (-20 after 1000 Hrs. UV as per ASTM D 1970-2021, Shore A as per ASTM D2240 – 85 , Peel Adhesion to Concrete under wet Condition -24 Hrs. – N As per ASTM C 794 – 11.4 , Abrasion resistance (CS 17 Wheel -1000 Cycle, 1.0 Kg) as per ASTM D 4060 - 7 mg , Depth of Water Permeability @ 10 Bar as per EN 12390-8-2019 – Nil , Water Migratlon Resistance as per ASTM D 7281,-2007 - No Leakage, Pass Spread of flame Class A. Complies with the requirements of EN 13251:2016 for a 25-year service life when used with a 225 gsm Fiberglass Chopped Strand Mat as fleece. The system comes with 10 Years’ waterproofing warranty from M/S Pidilite Industries LTD. For vertical surfaces and parapet walls should be enveloped & coated / painted with Dr. Fixit Raincoat Classic or Dr. Fixit Raincoat Select Waterproof coating system.

Sunken Area Waterproofing: Providing and carry out waterproofing treatment to sound, moisture free concrete surface. Shamfering the floor and wall junctions with cement mortar 1:4 admixed with Nitobond SBR or equivalent @ 1 litre per 50Kg bag of cement. System includes proper surface preparation to remove loose dust, dirt, loose mortar, curing compound etc., carry out cementitious injection grouting at leakage points (after pond test) and construction joints using cement slurry modified with Cebex 100-Plasticised expansive grout admixture supplied in 225 gm pouch, treatment of construction joints using polymer modified mortar prepared by using Nitobond SBR Latex, application of polymer modified vatta at floor-wall junction, filling of annular space around rain water outlet using Conbextra GP2 - Non-shrink cementitious grout.

Sl No 7 continued:- Application of Primer –Nitoproof WB primer and followed by two coats of Nitoproof 600PF- Liquid applied single component pitch free polyurethane coating coverage @ 2.3 kg/m2 to achieve 1.5 mm thickness in two coats followed by laying of 150 gsm non-woven geotextile layer etc. complete including all tools and tackles as per manufacturer’s specification.. Coating shall be having crack bridging of 2 mm, Elongation (ASTMD 412) – 600 %, Tensile Strength (ASTM D412) – 2.5 N/mm2, Recovery from 350 % Elongation (ASTM D412) – 95 %, 85% Solid Content, Tear Resistance (ASTM D624) – 15 Kn/m, Shore A Hardness (ASTM D2240) – 60, Water vapour transmission not more than 1g/m2/hr, Water Permeability (DIN 1048) – Nil, Service Temperature – -40°C to 70°C, Flash Point > 70 °C all as specified and directed by Engr in charge.