Why use non-shrink grout in concrete structures?

In the modern construction industry, non-shrink grout has become an indispensable solution, especially in large projects that require high durability and stability. Using this type of mortar not only helps increase the safety of concrete structures but also prevents the risk of subsidence, prolonging the life of the project. So, what is non-shrink grout and why is it so popular?

Why use non-shrink grout in concrete structures?

1. What is non-shrink grout?

Non-shrink grout is a cementitious grout used in structures that require stability and superior load-bearing capacity. The outstanding features of this grout are its self-leveling and non-shrink properties with extended working time to adapt to local temperatures, helping to limit common problems such as cracking or structural deformation.

What is non-shrink grout?

2. Benefits of non-shrink grout in preventing subsidence

Subsidence is one of the serious problems in construction, affecting the safety and quality of the project. Non-shrink grout brings many outstanding benefits in overcoming this problem.

Benefits of non-shrink grout in preventing subsidence

2.1 Preventing subsidence
When constructing large structures such as bridges, railways or factories, non-shrink grout helps fill any gaps between concrete structures. This prevents movement of the soil or underlying structure, thereby minimizing the risk of subsidence.

2.2 Increasing durability and stability
Thanks to its high load-bearing capacity, non-shrink grout increases the load-bearing capacity of the structure. In particular, in harsh environments, this type of grout also helps protect the structure from the effects of water and chemicals.

2.3 Saving maintenance costs
Using non-shrink grout from the beginning will help reduce maintenance and repair costs. This is especially important for large-scale projects or projects requiring high safety standards.

2.4 Versatility in Application
This type of grout can be used in a variety of applications, from industrial machine foundations, railway tracks, bridge bearings to filling expansion joints. This makes non-shrink grout the first choice of construction engineers.

3. Practical application of non-shrink grout

Non-shrink grout is not only widely used in civil construction but also an effective solution for industrial construction. Below are some common applications.

3.1 Large and industrial constructions
Machine foundations and rail platforms: Ensure stability and load-bearing capacity.
Bolt positioning: Maintain bolt position in large machinery structures.
Expansion joints: Reduce the impact of thermal expansion or deformation of the structure.

Industrial construction

3.2 Repair and renovation of old structures
For damaged structures, non-shrink grout is the ideal choice to fill cracks, gaps or holes in the concrete. This helps restore the bearing capacity and prolong the life of the structure.

Renovation of old buildings

3.3 Applications in civil construction
In addition to large projects, non-shrink grout is also used in housing construction, helping to increase the durability and waterproofing ability of concrete structures.

Civil Engineering

4. Notes when applying non-shrink grout

To ensure maximum efficiency when using non-shrink grout, construction must comply with some basic principles.

Notes when constructing non-shrink grout

4.1 Surface preparation
Clean the concrete surface thoroughly: Remove grease, dirt and other impurities to ensure the best adhesion.
Metal surface treatment (iron, steel): Remove rust, metal scales or grease on the surface.
Ensure the absorbent surface is saturated: Water until the surface reaches maximum moisture but do not let water stagnate, avoiding affecting the quality of the grout.
4.2 Grout mixing
Mix the grout in the correct water ratio: Slowly pour the grout powder into the pre-measured water to achieve the desired consistency.
Use suitable mixing equipment: Use an electric mixer at low speed (maximum 500 rpm) to mix well for at least 3 minutes, helping the mixture to achieve uniformity. A two-lever mixer or a forced drum mixer can be used if necessary.
Pay attention to environmental conditions: Construction in cool weather conditions will help limit the phenomenon of quick drying of the grout.
4.3 Application of non-shrink grout
Pour grout immediately after mixing: To ensure optimal expansion, the grout should be poured within 15 minutes after mixing.
Check the formwork system: The formwork must be firmly fixed, not to flow out during the grouting process.
Pour from a single direction: Maintain a stable pressure to ensure continuous flow of grout, avoiding trapped air bubbles.
4.4 Construction for special cases
Pour grout into machine bases or anchor bolts:
Moisten the entire surface by sprinkling water but do not let water accumulate.
Pour grout into the anchor hole first, then pour into the machine base base, ensuring continuous flow.
Pour into large cavities or large gaps:
If the thickness exceeds 60mm, large aggregate (size 4–32mm) can be added to reduce the heat generated during the curing process.
Use round aggregate to optimize filling. The maximum aggregate addition rate is 50–100% of the mortar weight.
Grouting the bottom surface:
Wet 24 hours in advance and maintain a stable pressure throughout the construction process.
Use cables or chains to ensure that air bubbles escape easily and that the grout is filled in the gaps.
4.5 Maintenance after construction
Cover the newly constructed surface to keep it moist, avoiding the mortar from drying out too quickly due to high temperatures.
Water gently in the first 24–48 hours to ensure perfect setting.
Using non-shrink grout in construction projects is not only the optimal choice to ensure stability and sustainability but also a step forward in improving the quality of modern construction. With outstanding advantages, from the ability to resist subsidence to flexible application, non-shrink grout is increasingly asserting its important role in the construction industry. If you are looking for the perfect solution for your project, why not try it today and feel the difference?