Problem definition: A two storeyed structure at IIT-Delhi was suffering from spalling, cracking and splitting of concrete in RCC elements like columns, beams, slabs, etc. Cracks were noticed along the reinforcement in RCC structural members and at the junction of RCC and brickwork. At some places the diameter of reinforcement rods reduced due to corrosion. Carbonation as well as seepage was also observed at several places in the building.
Dura Solution: 1 part of Durakrit was mixed with 2 parts of cement to form slurry which was then applied on the SSD surface (2 coats) to give a waterproof surface. It served as an anti corrosive coating for the steel rods and also inhibited carbonation. Moreover, it provided excellent bonding and adhesive properties to the concrete/ mortar which prevented cracking.
Problem definition: The cover concrete to main reinforcement of Punjab Cricket Association stadium wall was delaminated, cracked and spalled. The steel reinforcement was found exposed and rusted. The diameter of bars reduced considerably due to corrosion. Walls were found bulged at places apparently due to swelling of corroded rebars. There were vegetation growth and marks of leakage and seepage of water observed on the RCC elements.
Dura Solution: In order to ensure superior damp proof, anti carbonation/ anti efflorescence coating Durakrit was mixed with cement to form slurry which resulted in a hardened cementitious mortar showing excellent anti-corrosion and bonding properties. Moreover to waterproof RCC roof, slabs/ concrete walls, Duragard was applied which further arrested the cracking and ascertained superb breathing.
Problem definition: Our client BL Gupta and company at Manessar was unable to achieve the required strength of M40 grade using the normal mix design procedure. They were falling short of the target strength by 3-5 N/mm2. Moreover, in their effort to design higher grade of concrete they had to keep the water-cement ratio within permissible limits which again reduced the workability of concrete for pumping.
Dura solution: We suggested them to use Duramicrosilica which is a very high quality pozzolan that combines with Calcium Hydroxide to form Calcium Silicate hydrate gel. This gave high impermeability and helped them to achieve the desired strength of 40 N/mm2. To increase slump and pumpability of concrete, Durasupaspred was used.
Problem definition: Delhi cloth mills were experiencing excessive seepage through RCC walls inside auditorium as there were many pores all over surface. Moreover, there was plastic shrinkage and natural settlement in cement grouts along with corrosion of steel.
Dura solution: It was decided to go for non shrink injection grouts to seal the pores using DuraEV. Finally the entire exterior of the building was made waterproof using Durakrit which also inhibited corrosion of steel.
