Non-Shrink Grout

Back to Glossary

Non-Shrink Grout

What is Non-Shrink Grout?

A specialized cementitious material that maintains volume during curing without shrinkage, used for structural support and equipment anchoring.

Description

Non-shrink grout is a specialized cementitious material formulated to maintain its volume during curing without significant shrinkage, used for filling gaps, supporting structural elements, anchoring equipment, and providing precise bearing surfaces where dimensional stability and full contact are critical for structural integrity and load transfer. This engineered material contains special additives that compensate for the natural shrinkage that occurs in conventional concrete and grout during the hydration process. Non-shrink grout ensures complete contact between surfaces, eliminates voids, and provides reliable load transfer in critical structural connections.

The primary purposes include providing dimensional stability during curing to ensure complete contact between surfaces, eliminating voids and gaps that could compromise structural integrity, supporting heavy machinery, equipment, and structural elements with precise bearing surfaces, anchoring bolts, rebar, and other embedded items with reliable bond strength, creating level and stable foundations for equipment installation and operation, transferring loads effectively between structural components without settlement, and maintaining long-term performance under various loading conditions and environmental exposures.

Composition and formulation involve cement, aggregates, shrinkage-compensating additives, and performance-enhancing admixtures.

FAQs

  • What is non-shrink grout?

    Non-shrink grout is a specialized cementitious material formulated to maintain its volume during curing without significant shrinkage, ensuring complete contact and reliable load transfer.

  • Why is non-shrink grout used instead of regular concrete?

    Non-shrink grout eliminates voids and gaps that occur with regular concrete shrinkage, providing complete contact and reliable structural connections.

  • What are common applications for non-shrink grout?

    Common uses include equipment foundations, structural connections, anchor bolt installation, precast concrete connections, and precision bearing surfaces.

  • How is non-shrink grout different from regular grout?

    Non-shrink grout contains special additives that compensate for shrinkage, maintaining dimensional stability and ensuring complete void filling.

  • What causes non-shrink grout to not shrink?

    Special additives like aluminum powder or iron powder create controlled expansion that compensates for normal cement shrinkage during curing.

  • How long does non-shrink grout take to cure?

    Curing time varies by formulation and conditions, but initial set typically occurs in 2-4 hours with full strength development in 7-28 days.

  • Can non-shrink grout be used in cold weather?

    Yes, but special precautions are needed including temperature control, heated materials, and extended curing protection to ensure proper performance.

Fun Fact

Fun Fact: Non-shrink grout was developed in the 1950s to solve a major problem in construction – the gaps that formed when regular concrete shrank during curing! The breakthrough came when engineers discovered that adding tiny amounts of aluminum powder created just enough expansion to counteract shrinkage. Some non-shrink grouts can actually expand slightly during curing, ensuring 100% contact. Interestingly, the technology was first used extensively in nuclear power plant construction where precision and reliability were absolutely critical!

CSI Code

03 61 00

NAHB Code

310