Waterproofing of AquaArm 2c and AqauArm 1K carried to an Independent house in Hyderabad

Project :

Private Residence at Hyderabad
Waterproofing to basement

The south side basement wall is covered with lawn, All 365 days a year, water is logged in it. The basement waterproofing was carried out with rigid waterproof slurry coat wherein externally membrane coating existed (positive side) which failed and rectified by using injection pressure grouting and rigid waterproof slurry coat, Internally.

Investigation:

• The villa has a  basement with retaining wall of height 3 meters from the ground level
• Leakages & Seepage are observed in the wall through the electric conduit pipes
• Observed seepage standing water to 1 Meter on the floor in the Monsoon

Corrective Method:

• Injection Pressure Grouting  technique  (Cementitious and Low Viscous)
• Waterproof slurry coat for interior and exterior use

Recommendations:

• The existing wall plastering from inside to be removed on the effected area
• Injection pressure grouting was carried all along the weak points of the RR Masonry, Floor Junctions and low viscous grout in the cracks Filling up of RR masonry Pointing
• 15mm thick polymer modified Plaster CM 1:4
• A final waterproofing coat was applied on the negative side to arrest the negative water pressure.

Line of Action:

• Removal of inside plastering
• Injection grouting to the wall
• Re-do the Pointing
• Masonry Wall plastering
• Rigid Waterproof slurry coat

Injection Pressure Grouting:

Cementitious Injection pressure grouting was carried to the full height of the wall for strengthening the wall by drilling holes of size 12mm dia holes with electric drilling machines along the effected area and floor wall joints 1 meter C/C in staggered pattern to a depth of 6” and fixed PVC nozzles of 10mm dia in place using quick setting compound ReArm Fix 10 S, pressure grouting is done by using hand operated grouting machine of pressure 40 Psi through the nozzles starting from one nozzle and stopped the operations when the slurry starts coming out from adjacent nozzle, this is done similarly in all the nozzles. The Grouting is carried by admixing Grout Additive ArmGrout Additive @ of 250 Gms per bag of cement and Integral waterproof admixture/AquaArm C-16 @ 2% by Wt of cement by maintaining W/C ratio 0.45 for making the concrete voids free.

Redoing Pointing:

The pointing is thoroughly cleaned and the loose mortar is removed. The South East side crack in the masonry wall is restrengthened by Injection pressure method using low viscous grout. The Pointing is redone with CM 1:4 by admixing modified AquaArm  SBR 45 emulsion based material to make the joint water tight.

Re do the RR masonry wall plastering with Polymer Modified mortar:
Replastering is done with Polymer modified mortar CM 1:4 of 20mm thick

Application of Water proof Slurry coat to the wall

The wall is finally treated with Water proof slurry coat AquaArm 1K of 2mm in total in two operations. to prevent the ingress of moisture which can resist negative pressure up to 70 meters

Application of 1K

Application of two coats of 2mm thick in total
AquaArm 1K rigid hardening negative and positive waterproofing slurry coat
The distress of the inclined roof was the result of bad concreting practice. The detrition of the slab wall joints and inadequate provision for drainage of rain water on the terrace has also contributed to increased water penetration or infiltration.

Investigation:

• Observed Leakages in the flat roof
• Observed leakage in inclined roof

Corrective Method:

• Injection Pressure Grouting (Cementitious)
• Flexible membrane coating

Recommendation:

• Restrengthening the effected concrete
• Injection pressure grouting
• High Elongated Flexible Membrane Coating with UV resistance

Need:

The inclined roof should be treated with Flexible Waterproof Membrane coating having UV resistance, High Elongation and good crack accommodation capacity.

Surface Preparation for Inclined roof:

All the loose particles of the concrete is chipped off and cleaned thoroughly with scrubbers, to remove the contaminations on the surface.

Cementitious Injection pressure Grouting is carried at the following locations

• Where defective concrete is suspected and observed
• Where water seepage is observed

General

Drilled 12mm dia holes with electric drilling machines along the weak concrete area @ C/C 0.6tmr mtr to a depth of half of the slab thickness and fixed PVC nozzles of 10mm dia in place Pressure grouting is carried by admixing ArmGrout Additive using hand operated grouting machine of pressure through the nozzles starting from one nozzle and stopped the operation when the grout starts coming out from adjacent nozzle, this is done similarly in all the nozzles.

Membrane Coating:

MYK Arment has wide range of waterproofing system for both Positive and negative applications. As per the site conditions and for not disturbing the aesthetic view of the building, we opted  AquaArm 2C which is high elongated UV resistance, with good crack accommodation properties two component waterproofing system. In this case we opted AquaArm 2C as the product which suits to the requirement with the following properties.  AquaArm 2C is basically two component waterproofing system with UV Resistance, and Tensile Elongation of 80%, good crack accommodation capacity up to 1.6mm @ 4mm thick and can with stand positive head pressure up to 7 Bars

Technical Team:

The Technical Service Engineer of the MYK Arment has closely monitored the job and skilled Engineer K.Satish has supervised the entire work. The work was executed by trained Applicator Sana Building Sevices

The project is executed one year back as of now the entire system is performing well

Conclusion:

Identification of root cause, suitable technical solution and meticulous application as per the specification has resulted success. The client is very much satisfied