How to Choose the Right Non-Shrink Grout for Heavy Machinery Bases

Best Practices for Project Planning, Enhancing Project Efficiency

How to Choose the Right Non-Shrink Grout for Heavy Machinery Bases

Share it

Non-shrink grout is the industry standard for machinery base plate grouting, but not all non-shrink grouts are equal. Compressive strength, flow characteristics, working time, and environmental resistance vary significantly between products — and the wrong selection can cost far more than the grout itself.

This guide walks you through the key factors to evaluate when selecting non-shrink grout for heavy machinery bases, with practical advice tailored for construction and industrial projects across the UAE and GCC region.

What Is Non-Shrink Grout and Why Does It Matter?

Non-shrink grout is a cementitious or epoxy-based material specifically engineered to maintain or slightly expand its volume during curing — unlike standard concrete or mortar, which contracts as it hardens.

For machinery bases, this is critical because:

Shrinkage = gaps — Even microscopic gaps between the baseplate and foundation allow vibration, moisture ingress, and eventual cracking
Load transfer requires full contact — Machinery loads must be evenly distributed across the entire base. Voids concentrate stress and accelerate fatigue
Alignment is permanent — Once set, the grout locks the machinery in place. Improper fill means realignment jobs that stop production

A properly grouted machine base operates with consistent alignment, reduced vibration transmission, and longer service life for both the equipment and the foundation.

Types of Non-Shrink Grout: Cementitious vs. Epoxy

1. Cementitious Non-Shrink Grout

The most widely used type, ideal for the majority of industrial machinery installations. Uses a gas-releasing or crystalline expansion mechanism to compensate for cement shrinkage during hydration.

Best for:

General-purpose machinery bases (pumps, compressors, generators)
Elevated temperature environments (UAE and GCC climate compatible)
Projects with tight budgets and standard load requirements
Situations requiring rapid placement over large volumes

Key advantages:

Cost-effective
Easy to mix and place
Available in fluid, flowable, and dry-pack consistencies
Compatible with standard concrete foundations

Limitations:

Lower chemical resistance than epoxy
Not suitable for dynamic loads exceeding ~35 MPa
Requires moisture curing in hot climates

2. Epoxy Non-Shrink Grout

A three-component system (resin, hardener, filler aggregate) offering superior mechanical and chemical performance.

Best for:

High-dynamic-load machinery (turbines, heavy presses, centrifuges)
Chemical plants and refineries where spillage of acids, oils, or solvents is likely
Offshore platforms and marine environments
Precision machinery requiring near-zero creep under sustained load

Key advantages:

Compressive strengths exceeding 80–100 MPa
Excellent chemical and corrosion resistance
Near-zero creep under sustained compressive load
Superior bond strength to steel base plates

Limitations:

Significantly higher cost than cementitious alternatives
Sensitive to temperature during mixing and placement (critical in GCC heat)
Limited working time — requires experienced applicators
Exothermic reaction must be managed for thick pours

Property	Cementitious	Epoxy
Compressive strength	25–55 MPa	80–100+ MPa
Chemical resistance	Moderate	Excellent
Cost	Lower	Higher (3–5×)
Application complexity	Standard	Skilled applicator needed
Creep under sustained load	Moderate	Near-zero
Best for	General machinery	Turbines, chemical plants, marine

6 Key Factors to Evaluate When Choosing Non-Shrink Grout

1. Compressive Strength Requirements

Match the grout’s compressive strength to your machinery’s load profile. Always verify the OEM installation manual.

Machine Type	Recommended Minimum Strength
General pumps, fans, conveyors	25–35 MPa
Compressors, generators	40–55 MPa
Heavy presses, turbines	70–100+ MPa
Precision CNC, lathes	55–70 MPa (low creep critical)

2. Flow Consistency

Fluid consistency — Self-leveling, used for thin sections (25–50mm) and complex form geometries; ideal for most base plate applications
Flowable consistency — Slightly thicker, for sections up to 100mm; requires some encouragement to fill cavities
Dry-pack (stiff) consistency — Used for vertical applications or precision placement without formwork

3. Working Time and Setting Speed

GCC Warning: Some cementitious grouts lose 30–50% of their working time at GCC summer temperatures compared to lab conditions. Always request TDS at 40°C, not 20°C.

Request technical data sheets showing working time at 40°C — not just the standard 20°C laboratory value
Look for products with retarding admixtures suitable for hot weather placement
For large pours, pre-cool the mixing water and aggregates
Early morning placement is strongly recommended during summer months

4. Expansion Mechanism

Gas-releasing agents (aluminum powder-based) — Produce micro-expansion during the plastic stage; reliable and widely used
Pre-set expansion — Expansion occurs before final set; better controlled in hot climates
Post-set crystalline expansion — Less suitable for precision applications

5. Chemical and Environmental Resistance

Resistance to hydrocarbons (diesel, lubricating oil, hydraulic fluid)
Resistance to mild acids and alkalis
Chloride penetration resistance (critical for coastal projects in UAE)
Sulfate resistance for areas with aggressive soil conditions

6. Certification and Standards Compliance

ASTM C1107 — Standard specification for packaged dry, hydraulic-cement grout
BS EN 1504-6 — European standard for structural bonding mortars
Manufacturer’s third-party test reports — Compressive strength, expansion, and flow data verified by independent laboratories

Hot Weather Placement in the GCC: Critical Considerations

⚠ Warning: Working time drops 30–50% above 35°C — always test at actual site temperature, never rely solely on 20°C laboratory data sheet values.

In the UAE and GCC, ambient temperatures regularly exceed 35–45°C, which dramatically accelerates cement hydration and shortens working time. This is one of the most common causes of grouting failures on GCC sites.

Request TDS data at 40°C — not the standard 20°C lab values
Schedule pours between 5–7 AM before peak heat builds
Pre-cool mixing water and store bags in a shaded, cool warehouse
Use retarding admixtures approved for the specific product
Protect formwork from direct sun using shade cloth
Some cementitious grouts lose 30–50% of working time at GCC summer temperatures

Common Mistakes to Avoid

⚠ Using standard mortar instead of non-shrink grout

Standard mortar shrinks. Even 0.1% volumetric shrinkage under a large base plate creates voids that concentrate load and cause premature cracking.

⚠ Incorrect water-to-powder ratio

Adding excess water improves workability but drastically reduces compressive strength and increases bleed water. Always follow the manufacturer’s specified water ratio.

⚠ Ignoring ambient temperature

Placing grout during peak afternoon heat in the GCC without precautions is the most common cause of grouting failures. Never exceed the maximum ambient temperature specified on the data sheet.

⚠ Insufficient formwork sealing

Fluid-consistency grout will find every gap. Seal formwork thoroughly, especially around anchor bolt sleeves, to prevent bleed-out and voids.

⚠ Premature loading

Cementitious grouts typically require a minimum of 3–7 days before load application. Always confirm the required curing time before placing machinery on grouted bases.

Bulk Supply Considerations for Contractors

Plan quantities early — Non-shrink grout has a shelf life of typically 12 months from production date; order per project phase, not for the entire project
Consistent batching from a single supply batch — Lot-to-lot variation can affect color and minor performance characteristics; request product from the same production batch where possible
Storage in the GCC climate — Store in cool, dry conditions away from direct sunlight; bags stored in hot warehouses can begin hydrating in the packaging, reducing performance
Have technical data sheets approved before mobilization — Many contractors face delays when specified products are not pre-approved; source materials and get approvals in advance

Standards and Certifications Checklist

✓ ASTM C1107

Packaged dry hydraulic-cement grout standard

Compressive strength
Expansion characteristics
Flow and consistency data

✓ BS EN 1504-6

European standard for structural bonding mortars

Bond strength to substrate
Durability requirements
Chemical compatibility

✓ Third-Party Lab Report

Independent laboratory verification of claims

Compressive strength at various ages
Flow and expansion data
Temperature performance

Request test certificates before mobilization — reputable suppliers provide these documents upfront. Delays caused by unapproved materials cost more than verification.

Quick Decision Guide

Situation	Recommended Choice
Standard pumps and motors, budget-sensitive project	Cementitious non-shrink grout, fluid consistency
Turbines, heavy presses, high dynamic loads	Epoxy non-shrink grout
Chemical plant or refinery environment	Epoxy non-shrink grout
Coastal or marine project in UAE	Cementitious (chloride-resistant) or epoxy
Hot weather placement in GCC summer	Extended working time formula, early morning pour
Precision alignment-critical machinery	Epoxy non-shrink (low creep)

How iBeam Can Help

At iBeam, we supply certified non-shrink grout and a full range of industrial construction materials to contractors and project managers across the UAE, GCC, and African markets. We work directly with certified manufacturers and can provide full technical data sheets, test certificates, and bulk pricing for your project requirements.

Whether you need fluid cementitious grout for a pump skid installation or epoxy grout for a critical turbine base, our team can help you specify the right product for your application.

Get a Quote Contact Us

Frequently Asked Questions

What is the difference between cementitious and epoxy non-shrink grout?

Cementitious non-shrink grout is cost-effective, easy to apply, and suitable for most general machinery installations including pumps, compressors, and generators (25-55 MPa). Epoxy non-shrink grout is a three-component system offering 80-100+ MPa compressive strength, near-zero creep, and excellent chemical resistance. Epoxy is required for turbines, heavy presses, chemical plants, and offshore environments where higher performance is critical.

Why does non-shrink grout fail in UAE and GCC summer conditions?

The most common cause of grouting failure in the GCC is placing grout during peak afternoon heat without proper precautions. Ambient temperatures above 35-45 degrees C accelerate cement hydration and can reduce working time by 30-50% compared to the 20 degrees C laboratory values shown on most data sheets. Always request TDS data at 40 degrees C, schedule pours between 5-7 AM, pre-cool mixing water, and use retarding admixtures approved for your specific product.

What certifications should I look for when buying non-shrink grout?

For industrial and government projects in the GCC, always verify ASTM C1107 (standard specification for packaged dry, hydraulic-cement grout), BS EN 1504-6 (European standard for structural bonding mortars), and third-party laboratory test reports confirming compressive strength, expansion characteristics, and flow data. Reputable suppliers provide these documents upfront – always request them before mobilization.

How do I choose the right compressive strength for my machinery?

Match grout strength to your machinery load profile and verify the OEM installation manual. General pumps and fans require 25-35 MPa. Compressors and generators need 40-55 MPa. Precision CNC and lathes require 55-70 MPa with low creep. Heavy presses and turbines demand 70-100+ MPa and typically require epoxy grout. Under-specifying leads to creep, cracking, and misalignment over time.

Can iBeam supply non-shrink grout in bulk for large GCC projects?

Yes. iBeam supplies certified non-shrink grout and construction chemicals in bulk to contractors and project managers across UAE, GCC, and African markets. We provide full technical data sheets, test certificates, and competitive bulk pricing. Contact us at ibeam.ae or request a quote directly to discuss your project requirements and lead times.