Resin Injection

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Underpinning Specialist

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Resin injection is a process used in various industries to strengthen, repair, or waterproof concrete structures or other materials.

It involves injecting a resin material into weakened soil or voids in the structure to fill them, bond them, or seal them. The resin material used in the injection process can be either a two-component system, where two chemicals are mixed to create a reaction, or a single-component system, where the resin hardens when it encounters moisture or air.

Type of Resin

The type of resin used depends on the specific application and the properties required, such as strength, viscosity, and curing time.

The resin injection process typically involves drilling holes into the structures foundations at specific intervals and injecting the resin material under pressure to ensure that it penetrates deep into the weakened or voided soil. The pressure used depends on the size and location of the cracks or voids, as well as the viscosity of the resin material.

Why use chemical injection?

Chemical injection, also known as foundation underpinning, is a technique used to stabilize and strengthen the foundation of a building. This technique involves injecting a chemical mixture into the ground below the foundation to increase its load-bearing capacity and prevent further settlement or sinking.

There are several reasons why chemical injection may be used on a foundation:
  • The soil beneath a building’s foundation may become unstable due to various factors such as soil erosion, changes in moisture content, or geological conditions. Chemical injection can improve the soil’s stability and prevent further settlement.

  • Over time, a building’s foundation may settle due to changes in the soil or other factors. Chemical injection can be used to lift and level the foundation, restoring it to its original position.

  • Cracks in a foundation can indicate structural damage and may compromise the building’s stability. Chemical injection can be used to consolidate the surrounding soils supporting and lifting the structure back to its original state.

  • If a building is undergoing renovation or expansion, chemical injection may be used to strengthen the foundation to support the additional weight or load added to the existing structure.

Two-part chemical underpinning

Two-part chemical underpinning, also known as two-part structural injection, is a specialized form of underpinning used to stabilize and strengthen the foundation of a building or structure.

It involves injecting a two-part chemical compound into the soil beneath the foundation, which then expands and hardens to create a solid mass.

The two parts of the chemical compound are stored in separate drums until they are ready to be mixed and injected. Once mixed, the compound is injected into the soil through small holes (17mm in diameter ) drilled directly through the existing foundation. The chemical reaction between the two parts causes the compound to expand and harden, creating a solid mass that can support the foundation.

Benefits of two-part chemical underpinning

Quick and efficient
Two-part chemical underpinning can be completed quickly and efficiently, with minimal disruption to the building or surrounding area.
Two-part chemical underpinning can be used in a wide range of soil conditions and can be used to stabilize and support a variety of structures.
The solid mass created by chemical underpinning is strong and long-lasting, providing a durable solution for foundation stabilization.
Chemical underpinning is a non-invasive method of foundation repair, requiring only small holes to be drilled into the existing foundation.

What to look for?

Some common signs that a building may require foundation repairs include cracks in the foundation walls, uneven floors, doors and windows that are difficult to open or close, and bowing or leaning walls. Foundation repairs may involve a range of different techniques, depending on the specific issue and the type of foundations. Foundation repairs refer to the process of repairing damages or defects to a building’s foundation.

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Look out for these elements

01 Cracks in the foundation
If you have noticed cracks in the foundation walls or floors, this may be a sign that the foundation has experienced movement or settlement. Chemical underpinning can help to prevent further cracking and stabilize the foundation.
02 Uneven floors
If the floors in your building are uneven or sloping, this may be a sign of foundation settlement. Chemical underpinning can help to level the floors and prevent further settling.
03 Structural damage
If you have noticed structural damage to your building, such as leaning or bowing walls, this may be a sign of foundation settlement. Chemical underpinning can help to stabilize the foundation and prevent further damage.
04 Natural setting
Over time, buildings can settle into the ground as the soil beneath them shifts and compresses. This can cause small cracks to appear in walls and floors. While some settling is normal, excessive settling can cause significant structural damage.
05 Natural disasters
Seismic activity or other natural disasters can cause significant damage to buildings, including cracking in walls and floors.
06 Poor construction
If a building is not constructed properly, with inadequate support or poorly designed load-bearing walls, it can lead to cracking and other structural issues.

Common reasons for foundational subsidence.

Plumbing damage can cause significant problems to a building’s foundation if left unaddressed. Water damage is one of the most common causes of foundation damage, and plumbing leaks can be a major source of water infiltration. When plumbing leaks occur, they can saturate the soil around the foundation, causing the soil to expand and contract.

How do we find the voids?

GPR stands for Ground Penetrating Radar, which is a geophysical method that uses radar pulses to create images of the subsurface of the ground. GPR scanning is the process of using a GPR system to conduct a non-destructive investigation of the ground or other structures, such as concrete walls, floors, and pavements.

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GPR scanning is a non-invasive and non-destructive method that can be used to quickly and accurately gather data about the subsurface of the ground or other structures.

It can help to reduce the cost and time associated with traditional excavation and drilling methods, while also providing more detailed and accurate information. However, it is important to note that GPR scanning has some limitations, such as its inability to penetrate highly conductive materials, such as metals, or materials with high water content, such as clay soils.

GRP Scanning

GPR scanning is used for a variety of purposes, including:
Building utilities

Locating buried utilities, such as water pipes, gas lines, and electrical cables.


Mapping the subsurface features of the ground, such as bedrock, soil stratigraphy, and voids.

Condition assessment

Assessing the condition of concrete structures, such as bridges, tunnels, and buildings.

Detecting anomalies

Detecting voids, cracks, and other anomalies in concrete structures.

Locating artifacts

Investigating archaeological sites and locating buried artifacts.

How do we reassure you that the weakened soil has been remediated and consolidated?

DCP testing, or Dynamic Cone Penetration testing, is a method used to evaluate the strength and stiffness of soil and other materials. The test involves driving a metal cone into the ground at a constant rate and measuring the resistance to penetration.

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Here’s a simple explanation of how DCP testing works:
  1. 01 A metal cone, typically weighing 8 or 10 pounds, is attached to a steel rod. The rod is then dropped from a height of 20 inches, and the depth of penetration is measured.
  2. 02 The test is repeated at regular intervals, typically every 6 inches, until the desired depth is reached.
  3. 03 The resistance to penetration is measured in terms of the number of blows required to drive the cone a specific distance, such as 0.2 inches.
  4. 04 The data collected during the test is used to calculate the soil’s strength and stiffness, which can be used to evaluate the soil’s suitability for various types of construction.

DCP testing is a simple and cost-effective method for evaluating the strength and stiffness of soil and other materials. It is commonly used in road construction and other civil engineering projects to assess the suitability of soil for supporting heavy loads.

The results of DCP testing can also be used to determine the depth and thickness of the soil layer needed for a specific application. DCP testing takes place before and after the completion of the project, this allows out team to provide the client with a detailed report of previous and existing soil conditions. 

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