How Crystalline Waterproofing Works in Concrete
Concrete is one of the most widely used construction materials, valued for its strength, durability and versatility. Yet even well-designed concrete can develop cracks during its service life. A crack does not automatically mean that a concrete structure has failed. However, understanding why the concrete cracked is an important first step towards determining the appropriate repair approach. From shrinkage and movement to loading and deterioration, different cracks can have different causes. Simply covering the visible crack without considering the underlying issue may not provide the right long-term solution.
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Why Does Concrete Crack?
Concrete is constantly exposed to stresses throughout its lifecycle. Changes within the concrete itself, movement of the structure and the conditions surrounding it can all contribute to cracking.
Some common causes include:
1. Shrinkage
Concrete can experience dimensional changes as it cures and loses moisture. If movement is restrained, stresses can develop within the concrete and cracking may occur.
2. Structural Movement and Loading
Concrete structures are designed to withstand specific loads. Movement, changes in loading or stresses within the structure can contribute to cracking.
The location, direction and extent of the cracking can provide important information when assessing what may be happening within the concrete.
3. Temperature Changes
Concrete expands and contracts as temperatures change. Where this movement is restricted or not adequately accommodated, stresses can develop and may contribute to cracking.
4. Environmental Exposure
Concrete structures are frequently exposed to demanding conditions, including moisture, changing temperatures and aggressive environments.
Over time, deterioration can affect the condition of concrete and create the need for appropriate repair and protection.
5. Surface Damage and Wear
Not every concrete defect involves a deep structural crack. Concrete floors, slabs and other exposed surfaces can become worn, damaged or marred during service.
These areas may require resurfacing or patching to restore the concrete surface rather than a conventional crack repair.
Before Repairing a Crack, Understand the Problem
Effective concrete repair begins with understanding the condition of the existing concrete.
Before selecting a repair material, consider questions such as:
- What appears to have caused the damage?
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Is the repair horizontal, vertical or overhead?
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Is the defect limited to the surface or is a structural repair required?
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What environmental and service conditions will the repaired area face?
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What performance will be required from the repair material?
The answers help determine the type of repair solution most appropriate for the application.
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Choosing the Right Concrete Repair Material
Euclid Chemical Africa offers cementitious and epoxy repair materials designed for a range of concrete repair requirements.
Euco Re-Cover
Euco Re-Cover is a polymer-modified, fibre-reinforced concrete resurfacer designed to restore and improve damaged or marred concrete surfaces. Only water needs to be added.
It provides an option where the objective is to restore an existing concrete surface rather than replace it.
Euco Repair V100
For vertical and overhead applications, Euco Repair V100 is a quick-setting, low-shrinkage mortar reinforced with polymers and fibres. It is specifically designed for high-performance vertical and overhead concrete repairs.
Express Repair
Where rapid strength development is required, Express Repair is a ready-to-use cementitious repair mortar that gains strength rapidly and incorporates an integral corrosion inhibitor.
VersaSpeed LS100
VersaSpeed LS100 is a versatile cementitious, rapid-strength gaining repair mortar designed for horizontal and form-and-pour repair projects. This makes application orientation an important consideration when choosing between different repair materials.
Tamms Structural Mortar
For structural concrete repairs, Tamms Structural Mortar is a single-component repair mortar that can be applied by low-pressure spray or hand trowel. Its formulation incorporates Portland cement, graded aggregates, fibres and polymers. It can be used for vertical and overhead repairs as well as applications including bridges, parking garages, tunnels, manholes, pipelines, dams and other wastewater structures.
Tamms Thin Patch
Where smaller surface defects need attention, Tamms Thin Patch is a polymer-modified cement mortar intended for repairing defects in concrete and masonry. It can be applied from a featheredge up to 2.54 cm, making it suitable for thinner repairs and patching applications.
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Match the Repair to the Concrete
Concrete repair should not be treated as a one-size-fits-all process. A worn concrete surface, a vertical repair and a structural repair can each require very different materials. The condition of the existing concrete, location of the repair, service environment and required performance should therefore guide product selection.
Euclid Chemical's repair range includes solutions covering:
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Concrete resurfacing
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Vertical and overhead repairs
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Rapid-strength repairs
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Horizontal repairs
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Structural repair mortars
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Thin concrete and masonry patching
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Structural epoxy applications
Selecting an appropriate system starts with correctly understanding the problem.
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Repair Today. Protect Tomorrow.
Cracking and deterioration are signs that concrete deserves attention, not necessarily that it has reached the end of its service life.
By investigating what caused the damage and selecting a repair material suited to the application, concrete can be repaired and its service life extended.
Explore the Euclid Chemical concrete repair range to find repair solutions for horizontal, vertical, overhead and structural applications.
- Head Office: Midrand Industrial Park
- 8 Cresset Rd, Chloorkop, Midrand, 1624
- +27 (11) 254 5500 stoncorsa@stoncor.co.za