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.
NBM&CW September 2009
Fabric Reinforced Cementitious Matrix: Structural Strengthening Systems

Fabric Reinforced Cementitious Matrix: Structural Strengthening Systems

The need for structural strengthening in aging infrastructures is rapidly escalating across various sectors, encompassing buildings, industrial structures, bridges, dams, ports, and other important structures. This demand extends

Read more ...

Assess Build Chem: Long-Lasting Solutions for Basement Waterproofing

Assess Build Chem: Long-Lasting Solutions for Basement Waterproofing

Assess Build Chem provides effective and long-lasting protection for buildings with its innovative products and solutions for deep/large basement waterproofing. Basement waterproofing is a crucial aspect of building construction, especially in

Read more ...

Dam Rehabilitation With Cutoff Wall for Seepage Control

Dam Rehabilitation With Cutoff Wall for Seepage Control

As storm damage becomes more severe and has occurred more frequently in recent years, addressing the needs to repair essential infrastructure and dam rehabilitation is also becoming more common. However, deep foundation experts and others

Read more ...

JOGANI Reinforcement: Alkali Resistant ARACC Coated Waterproofing Mesh

JOGANI Reinforcement: Alkali Resistant ARACC Coated Waterproofing Mesh

Jogani Impex is considered an industry leader in providing international grade Alkali Resistant ARACC Coated waterproofing mesh, which enhances the waterproofing systems and solutions in all types of buildings and structures, while saving money

Read more ...

Assess Build Chem’s Deep & Large Basement Waterproofing Solutions

Assess Build Chem’s Deep & Large Basement Waterproofing Solutions

Assess Build Chem, a leading provider of construction chemicals, is ensuring long-term protection of buildings with its innovative waterproofing solutions that include a 5-step waterproofing method for deep and large basements. Sunny Surlaker, Head

Read more ...

Agrani: Waterproofing, Retrofitting, Civil Work & Interior Fit Outs

Agrani: Waterproofing, Retrofitting, Civil Work & Interior Fit Outs

By adhering to the highest industry standards, Agrani Group has gained a reputation for delivering solutions waterproofing, retrofitting, civil work & interior fit outs that surpass client expectations, avers Ramendra Bahadur Sinha

Read more ...

FAIRMATE's FAIRFLO CRYSTALLINE: Waterproofing Admixture for Concrete

FAIRMATE's FAIRFLO CRYSTALLINE: Waterproofing Admixture for Concrete

FAIRMATE is catering to the Speciality Construction Chemical Industry by manufacturing a complete range of construction chemicals like FAIRFLO CRYSTALLINE - Waterproofing Admixture for Concrete, along with cost-effective solutions and world-class

Read more ...

Nippon Paint India: Paints, Construction Chemicals & Waterproofing

Nippon Paint India: Paints, Construction Chemicals & Waterproofing

In line with its global vision, Nippon Paint India is expanding its portfolio beyond the paint and coatings product range; it will now offer products and solutions under the broad categories: Dry mix, Repair and Maintenance, Construction Chemicals, and

Read more ...

Alkali-Aggregate Reaction in Concrete Structures & Preventive Measures

Alkali-Aggregate Reaction in Concrete Structures & Preventive Measures

When the alkali of cement reacts with the reactive constituents of aggregates, the reaction is deleterious though very slow, and the distress is exhibited when the volume inside the concrete is increased due to the formation of alkali-silica gel, causing the

Read more ...

Retrofitting for buildings: Enhance structure lifespan & efficiency

Retrofitting for buildings: Enhance structure lifespan & efficiency

Despite understanding the potential of retrofitting and its distinct and far-reaching advantages in making existing buildings green and sustainable, retrofitting continues to be undertaken on a very limited scale; hence, it needs to be promoted and made mandatory

Read more ...

Cause of Distress of an Old Building Through Advanced Analysis

Cause of Distress of an Old Building Through Advanced Analysis

The technical service life of a reinforced concrete building is the time in service when structural safety is unacceptable due to either material degradation or exceeding the load carrying capacity, or both. In which case, the repair strategy may be adopted

Read more ...

Value Engineering with MCI®-2019 Water Repellent for Concrete Repair

Value Engineering with MCI®-2019 Water Repellent for Concrete Repair

True value engineering saves money without reducing service life or affecting the quality of construction or materials. Ideally, it adds value to the project. MCI®-2019 Water Repellent is one such value engineering solution that can extend

Read more ...

Agrani Milestone Use Carbon Fiber Laminates to Strengthen Slab

Agrani Milestone Use Carbon Fiber Laminates to Strengthen Slab

Ramendra Bahadur Sinha, Managing Director, Agrani Milestone, explains the remedial measures and challenges faced during slab strengthening of a deflected slab at IIT. NBCC India Limited undertook the strengthening of a deflected slab at a G+2 storey IIT building

Read more ...

Waterproofing Challenges & Remedial Measures in High Rise Buildings

Waterproofing Challenges & Remedial Measures in High Rise Buildings

High-rise buildings need special attention when it comes to waterproofing as the challenges inherent in them are peculiar in nature. Unfortunately, there is a lack of knowledge on the remedies and products available in the market as water- proofers continue to

Read more ...

Importance of Waterproofing Structures

Importance of Waterproofing Structures

The longevity of structures depends on how much resistance the building element will offer to water ingress. Water leakage not only reduces the durability but also hampers the serviceability or usability of the structure; hence, a good waterproofing system will

Read more ...

Terrace Waterproofing Solutions for Energy-Efficient Buildings

Terrace Waterproofing Solutions for Energy-Efficient Buildings

Terrace waterproofing is particularly important and is considered a priority as the roof is always exposed to harsh climatic conditions and weather changes. Rajeev Gupta, Business Head, ECMAS Construction Chemicals Pvt. Ltd. An effective waterproofing solution

Read more ...

Structural Rehabilitation of Reinforced Concrete Structures

Structural Rehabilitation of Reinforced Concrete Structures

Cement concrete is one of the most important construction materials and is practically basic to present-day developments. It is strong enough mechanically, yet vulnerable to deterioration. It thus gets damaged and even fails. This deterioration may be due to the weathering

Read more ...

Thermax - HDPE-SBS Waterproofing System for Basement Waterproofing

Thermax - HDPE-SBS Waterproofing System for Basement Waterproofing

Gradual shift in lifestyle has driven the idea of modern construction towards developing underground spaces and buried structures to bring efficiency in use of space. However, the improved efficiency comes with an increase in challenges like infiltration

Read more ...

Waterproofing in Hilly Areas with Sub-Zero Temperatures

Waterproofing in Hilly Areas with Sub-Zero Temperatures

Industry experts Kunjan Popat, General Secretary, Waterproofing Association of India; Ramendra Bahadur Sinha, Managing Director, Agrani Enterprises, and MS Sudish, Director, SIWIN Institute of Waterproofing and Insulation, share the challenges

Read more ...

To get latest updates on whatsapp, Save +91 93545 87773 and send us a 'Saved' message
Click Here to Subscribe to Our eNewsletter.