Permanent Sealing for the Water Bearing Cracks or Moving Joints in Concrete Structures

Permanent Sealing for the Water Bearing Cracks or Moving Joints in Concrete Structures
The construction industry has come across situations when the concrete structure has developed cracks and water has seeped inside. Also there are situations when the same crack starts behaving as a moving / dynamic crack by relieving the internal stress in the structure. Some times the Construction joints / cold joints also start leaking due to the movement of the structure due to development of some stresses. Now it becomes challenging to stop the leakage, as the waterproofing system employed has to resist not only the water pressure from the negative side (Exit side of water) but also the flexibility required for absorbing the stresses due to the dynamic nature of the crack / joint.

Koster KB-PUR® Injection System is a unique method introduced from Chowgule Koster (India) Construction Chemicals Pvt.Ltd.

The system is initiated with the injection of the KB PUR® IN I a two component water activated PU-Injection Foam into the crack, which stops the ingress of water and immediately thereafter is followed by injecting the KBPUR® IN II which is a flexible 2 Component polyurethane – Injection Resin which not only seals off the water but also remains permanently flexible.

The KB-PUR® IN I is water activated hydrophobic MDI based polyurethane foam. The system only reacts when it comes in contact with water, expands and converts into stiff closed cell, waterproof polyurethane foam. KB-PUR® IN I is free of solvents and fillers; it is resistant to hydrolysis and is suitable for use in drinking water areas (KTW-Test). KB-PUR® IN I consists of a resin and a special catalyst, supplied separately, to allow on-site adjustments of gel.

Permanent Sealing for the Water Bearing Cracks or Moving Joints in Concrete Structures
The KB-PUR® IN II is a solvent and filler free, low viscosity, 2 component, elastic polyurethane injection resin for sealing of dynamic / moving cracks. The KBPUR® IN II is permanently elastic and is designed to withstand continuous contraction and expansion. With flexible resin, the crack is converted into an equivalent of an expansion joint and movement can thus continue without leakage or damage to the structure.

Application Procedure

Mark and drill the holes on either side of the Crack / Joints in staggering manner and at a distance of 30 cm c/c on each side and at 45 degree angle, clean the hole and fix the packers and tighten it.

For dry joints KB-PUR® IN IIPU resin can directly be injected. But if the water is oozing out, then KB-PUR® IN I is injected first to stop the water by foaming.

Add the KB-PUR® IN I component A and B and mix thoroughly with a slow speed mixer until a homogeneous mixture is obtained (avoid mixing humid air into the resin). Inject the material with conventional single component pumps at high or low pressure.Always start at the bottom and continue upwards, if in doubt, go back and inject the same packer once again.

As soon as the KB-PUR® IN I comes in contact with water, it reacts and forms foam having 30 times volume expansion. Water will be replaced by the rigid closed cell foam and can no longer pass through the crack.

Mix both the component of KB-PUR® IN II and inject through another pump into the same port injected with KB-PUR® IN I. KB-PUR® IN II will replace the Foam and occupy the entire depth of the crack.

Case Study

Permanent Sealing for the Water Bearing Cracks or Moving Joints in Concrete Structures
In a classic example of Box Push Tunnel Sub - Way constructed at Virar Railway station below the busiest Western Railways, the Butt joint between the pre - cast tunnels started leaking and the problem Was aggravated due to the vibrations from the traffic. The joints were treated Vertically, Horizontally and Overhead by Koster KB-Pur® Injection System.

The joints were treated under water pressure with the KB-PUR® IN I - foam forming material and then with KB-PUR® IN II- flexible PU Resin.

Similar treatment was also adopted for the Moving Joints of large basements, settling joints of Thickener at steel plants, Cooling Towers of Power Plant etc.

NBMCW September 2009

Click Here
To Know More / Contact The Manufacturer
Please provide your details we will contact you as soon as possible
Please let us know your name.
Invalid Input
Please let us know your Designation.
Invalid Input
Please let us know your City.
Please let us know your State.
Please let us know your Country.
Please let us know your Contact Number.
Please let us know your email address.
Please brief your query.

Buildtech: Pragmatic Approach to the Methodology of Retrofitting Buildings

With the increase in construction of buildings in the last two decades, it has been observed that many of the structures are already showing signs of distress. In some cases, repair measures become necessary even within a span Read More ...

Pure Leathers Waterproofing Solutions for Tunnels, Roofs, Water bodies…

There are various types of Waterproofing Systems available for different applications. Based on its vast experience in waterproofing, Pure Leathers Pvt. Ltd. (PLPL) recommends the most suitable waterproofing systems for various site requirements Read More ...

This monsoon, insure strength for your building with waterproofing & repair solutions from Chowgule

Over a period of time, a building goes through severe climatic changes leading to its ageing, thereby creating loopholes and leakages. A leakage deteriorates the quality of the building, since the water through the affected area, also flows to other Read More ...

STP: Waterproofing & Construction Chemicals

The concept of liquid waterproofing has existed since the early 1800s, when natural bitumen was combined with jute, straw, rag felt and other man made materials to provide a waterproofing solution. Apart from liquid waterproofing membranes Read More ...

Atul: Epoxy & PU solutions for terrace waterproofing with 7-year performance warranty

Water is good while constructing a building, but not so well after the concrete is set. Rain water starts penetrating through the porous concrete in walls and ceiling, creating ugly images of peel-off paints, cracks, damp walls filled with deadly Read More ...

Tremco: Solutions For Problematic Leaking Podiums Latest Technological Advances

India is seeing a spurt in urbanization. As we continue to build bigger, faster and taller, reinforced concrete is the choicest of materials to meet the needs of speed and durability. If we understand concrete simplistically, it consists of the aggregate Read More ...

Long lasting waterproofing solution with Epoxy and PU

Atul Ltd's Lapox® epoxy range of adhesives find the largest application in the construction sector. Products include Lapox® Lacrete and Lapox® Procoat for terrace waterproofing; Ultrafix for vertical cladding Read More ...

Repair & Rehabilitation: STP Ltd

STP provides Waterproofing & Protective Coating solutions for all areas. The range of waterproofing coats consists ShaliRust Off, ShaliPrime ZnR, ShaliBond concrete, Shalifix EM, ShaliGrout EI, ShaliFix RM Read More ...

The Raincoat Advantage

In heavy monsoons, would you be caught wearing a torn canvas jacket? Of course not, what a ridiculous question! You would wear a raincoat. So why not extend the same logic to the building structures Read More ...

Roads & Bridges: Repairing, Waterproofing & Asset Management

Waterproofing Technology is continuously progressing. In this context, several important concepts are illustrated which are of use to technology planners and forecasters. STP Ltd has one of the biggest Read More ...

STP offers Green and Cost-Effective Solutions for Road Construction & Maintenance

Fiscal year 2016-17 started with big reforms and multi-dimensional growth-oriented measures like budget allocation for infrastructure developments, over 10,000 km of roads, waterways, railways, and Read More ...

Black Bond Seal Black Concentrated Resin for Multiple Applications

Bond Seal India Pvt. Ltd. is meeting the demand in the construction industry for protection, maintenance and restoration by offering the right solutions and quality products, and innovating for the future Read More ...

Trelleborg launches Rotary Seal for equipment working under high pressure

Trelleborg Sealing Solutions
Trelleborg’s Turcon® Roto Glyd Ring® V rotary seal is designed for equip to work under high pressure without compromising the sealing performance. Trelleborg Sealing Solutions launched an innovative Read More ...

Polygomma™ EPDM Waterproofing Membranes for various areas of building

Polygomma
EPDM Waterproofing Membranes by Polygomma™ are easy to install and can be used on various areas of a building including basements, podiums/landscape areas, roofs/terraces, wet areas Read More ...

Buildtech offers high quality Liquid Waterproofing Membranes

Buildtech
BUILDTHENE IC-Polyurethane-based & BUILDCOTE EC 20-Acrylic Polymer-based Liquid Membranes are the two new waterproofing products by Buildtech. Buildtech is a trailblazer in the Construction Chemicals Read More ...

STP’s Waterproofing & Coloring Solutions for Roads & Bridges

Shali Seal RSTC Elevated Roads
STP's waterproofing soultions include ShaliSeal RSTC, SuperThermoLay APP membrane, ShaliSeal CSS, ShaliPatch, ShaliPatch EC, to be used on Roads & Bridges. Waterproofing Technology is continuously Read More ...
NBM&CW

New Building Material & Construction World

New Building Material & Construction World
MGS Architecture

Modern Green Structures & Architecture

Modern Green Structures & Architecture
L&ST

Lifting & Specialized Transport

Lifting & Specialized Transport
II&TW

Indian Infrastructure & Tenders Week

Indian Infrastructure & Tenders Week