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ECLIPSE shrinkage-reducing admixture is a liquid concrete admixture designed to limit drying-shrinkage strain as hardened concrete loses moisture. In North American documentation, the family includes ECLIPSE 4500 for broad concrete, mortar, grout and shotcrete use, and ECLIPSE Floor 200 for indoor slab-on-grade floors. The manufacturer describes the mechanism as lowering the surface tension of pore water, reducing the capillary forces that pull the cement paste inward during drying.
Neither formulation is a universal cure for cracking. Cement and pozzolan content, water, paste volume, aggregate, other admixtures, curing, environment and construction practice all affect the result. The defensible way to specify ECLIPSE is to run project-specific trial mixtures, compare them with a reference concrete and measure drying shrinkage with ASTM C157 before construction.
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ECLIPSE is a liquid admixture added to concrete or cementitious mixtures to reduce drying shrinkage. As concrete dries, water leaves the capillary-pore system and surface-tension forces create tensile stress in the paste. Chryso describes ECLIPSE 4500 as reducing pore-water surface tension, which lowers the shrinkage strain that develops during drying. The product does not replace sound mix design, curing, joints or crack-control reinforcement.
The current US technical data sheets are dated September 26, 2025. They give typical dosage ranges, addition guidance and application limits, but require the specifier to confirm the current local technical and safety data sheets before ordering or batching. Product names, formulations and performance data can vary by region.
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Read the ECLIPSE 4500 product information with the current US ECLIPSE 4500 technical data sheet, and use the separate ECLIPSE Floor 200 technical data sheet for indoor slabs.
Which ECLIPSE formulation fits the project?
ECLIPSE 4500 is the general-purpose choice in the US documentation; ECLIPSE Floor 200 is specifically positioned for indoor slab-on-grade construction where reduced curling and longer joint spacing may be objectives. Select by application and exposure, not by the product name alone.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →| Formulation | Documented applications | Typical US dosage | Important qualification |
|---|---|---|---|
| ECLIPSE 4500 | Precast, prestressed and post-tensioned concrete; ready-mix; mortar; grout; wet-mix shotcrete; all cement types listed by the datasheet | 0.5–1.5 gal/yd³ (2.5–7.5 L/m³); broader rates may be used to meet project requirements | In freeze-thaw concrete, verify air content and all specified durability criteria. Set is typically extended by less than one hour. |
| ECLIPSE Floor 200 | Indoor slab-on-grade concrete, including projects seeking reduced curling or extended joint spacing | 0.5–1.5 gal/yd³ (2.5–7.5 L/m³); lower and higher rates have also been used according to the datasheet | The datasheet says it meets or exceeds ASTM C494 Type S. Do not apply that classification to other ECLIPSE formulations without their own documentation. |
These are manufacturer guidance ranges, not guaranteed prescriptions. The effective concentration depends on mix water and on the cementitious system. A slab exposed to de-icing salts, a post-tensioned member and a dry-mix repair mortar may need different qualification work even when the nominal dosage is similar.
How does ECLIPSE reduce drying shrinkage?
Drying shrinkage is driven by moisture loss from pores in cement paste. Capillary tension increases as the pore water menisci become more curved, pulling the solid skeleton inward. The ECLIPSE mechanism is to lower pore-water surface tension, reducing that capillary pull at a given moisture state. The result is a lower measured shrinkage strain in a compatible mixture, not an elimination of all volume change.
Concrete can still crack because of thermal movement, restraint, settlement, plastic shrinkage, poor curing, excessive water, thermal gradients or construction loads. ECLIPSE therefore works as one part of a crack-control strategy that also includes aggregate selection, water control, curing, joint layout and reinforcement detailing.
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What dosage and batching sequence should be used?
For both US products, the normal starting range is 0.5–1.5 gal/yd³ (2.5–7.5 L/m³). The final rate should be selected from trial mixtures that use the actual cementitious materials, aggregates, water-reducing admixtures and environmental conditions expected on the job. Do not copy a rate from another project without confirming the formulation and units.
- Confirm the local documents. Obtain the current technical data sheet and safety data sheet for the product supplied in your region. Check whether the project calls for ECLIPSE 4500 or Floor 200 and whether the exposure requires air entrainment or other durability limits.
- Calculate the batch quantity. Convert the selected rate to the plant’s batch volume and verify the dispenser calibration. Keep gallons per cubic yard and litres per cubic metre distinct; they are equivalent ranges stated in the US sheets, not interchangeable labels for a different concentration.
- Add after dry materials and most of the water. The ECLIPSE 4500 sheet generally recommends introducing the liquid after the dry materials and most of the mixing water. Follow the supplier’s current sequence for the specific plant and admixture package.
- Allow adequate mixing. Use the plant’s established mixing time needed to distribute a liquid admixture uniformly. Confirm slump, air, temperature and other fresh properties before discharge.
- Recheck field adjustments. Water added at the jobsite changes the admixture’s concentration relative to mix water and can erase the intended shrinkage benefit. Record any water or admixture adjustment and its timing.
ECLIPSE 4500 has slight retarding properties; the 2025 US sheet says set is typically extended by less than one hour. That is a typical observation, not a guaranteed limit for every cement, temperature or admixture combination. Plan finishing and protection around measured setting behavior.
How should a trial mixture be designed?
A trial program should reproduce the production materials and compare ECLIPSE with a relevant reference concrete. Chryso’s TB-1000 bulletin identifies water content, paste fraction, admixtures, cementitious and pozzolan types and quantities, aggregate characteristics and proportions as major influences on drying shrinkage.
- Define the performance target. State whether the project needs a lower ASTM C157 strain, reduced curling, longer joint spacing, a durability limit or a combination. A target joint spacing is not itself a shrinkage result.
- Prepare a reference mixture. Use the proposed production mixture without ECLIPSE. Keep its materials, air, slump, temperature and curing conditions documented so comparisons are meaningful.
- Prepare at least two ECLIPSE rates. TB-1000 recommends low- and high-dose ECLIPSE mixtures in the test matrix. The normal US range of 0.5–1.5 gal/yd³ (2.5–7.5 L/m³) is a practical starting window, subject to the project data sheet.
- Include water-reduced variants when relevant. The bulletin specifically recommends including superplasticized and mid-range water-reduced mixes because these admixtures can change the attainable shrinkage reduction.
- Control fresh properties. Measure and record slump or flow, air content, temperature, density, setting behavior and strength specimens as required by the specification. Keep curing and specimen handling consistent.
- Use a qualified laboratory. Shrinkage results are sensitive to specimen preparation, curing and measurement. Have a qualified laboratory perform the selected standard and report deviations.
How is shrinkage measured with ASTM C157?
ASTM C157 is the reference method identified in the ECLIPSE documents for evaluating drying shrinkage of concrete prism specimens. The key decision is comparative: evaluate the ECLIPSE mixtures against an otherwise relevant reference made with the same project materials and procedures. A single percentage copied from another formulation cannot predict a field slab.
Specify the specimen age, curing period, drying environment, measurement schedule and acceptance criterion in the test plan. Keep the laboratory report with the mixture submittal, including the exact ECLIPSE product, regional data sheet, dosage, batch sequence and all companion admixtures. If the reference mixture changes, the shrinkage comparison may no longer answer the design question.
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What performance figures have been published?
A UK GCP product page reports that ECLIPSE Floor at a stated dosage of 7.5 L/m³ achieved up to an 80% reduction in ASTM C157 drying shrinkage at 28 days and up to 50% at one year or beyond. Those are manufacturer-reported, formulation- and test-specific figures from a UK source. They should not be presented as a guaranteed result for the US Floor 200 sheet, ECLIPSE 4500 or a different concrete.
Regional formulation, cement chemistry, aggregate, water-to-cementitious ratio, curing and test conditions can all change the outcome. Use the UK ECLIPSE FLOOR information only as context, then qualify the locally supplied product under the project test plan.
What changes in freeze-thaw concrete?
ECLIPSE 4500 may be used in freeze-thaw work only when the complete durability design is maintained. Its US data sheet calls attention to air content and other specified mix criteria because a shrinkage admixture does not substitute for a properly entrained air-void system.
Measure air in the fresh concrete and verify the specified spacing factor, strength, water-to-cementitious ratio and exposure requirements through the project’s normal qualification process. Do not assume that an unchanged air-entraining-admixture dose will produce unchanged air after ECLIPSE is introduced; confirm it in the actual mixture.
How should ECLIPSE be compared with another shrinkage strategy?
Compare alternatives against the same project objective and the same reference mixture. A fair decision considers application and exposure, air-entrainment requirements, dose and addition sequence, compatibility with other admixtures, set and strength effects, target joint spacing and measured ASTM C157 performance.
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- Choose ECLIPSE 4500 when the work spans ready-mix, precast, prestressed or post-tensioned members, mortar, grout or wet-mix shotcrete and the trial program supports the selected rate.
- Choose Floor 200 when the documented application is an indoor slab-on-grade and the team is evaluating shrinkage and curling in that floor system.
- Delay selection when the supplier, regional formulation, air behavior or compatibility with the existing admixture package has not been confirmed.
- Retain conventional controls such as aggregate optimization, low water content, curing, jointing and reinforcement. ECLIPSE is an admixture, not a replacement for those measures.
What are the most common specification and field mistakes?
Most problems come from treating a typical dosage or product-page percentage as a promise. The following checks prevent the most avoidable errors.
- Using the wrong formulation: Floor 200’s indoor slab positioning and Type S statement do not automatically apply to ECLIPSE 4500. Put the exact product name and data-sheet revision in the submittal.
- Mixing regional data: The detailed dosage sheets are US documents, while the large percentage reductions cited above come from a UK page. Keep geography and formulation attached to every performance statement.
- Skipping the reference concrete: Without a no-ECLIPSE control, a lower strain cannot be attributed confidently to the admixture.
- Changing water after dosing: Jobsite water alters the concentration and can change slump, strength, set and shrinkage. Require approval and documentation for adjustments.
- Ignoring set time: The typical sub-one-hour extension for ECLIPSE 4500 can matter during cold weather, long hauls or tight finishing windows. Confirm setting behavior in the trial.
- Assuming lower shrinkage means no cracks: Restraint, joints, curing and thermal effects still govern cracking. Keep the structural and concrete-shrinkage details coordinated.
- Using an uncalibrated dispenser: A nominal plant setting is not proof of delivered dosage. Calibrate, record and periodically verify the liquid delivery system.
What should a project submittal and placement checklist contain?
A complete submittal makes the admixture traceable from specification through placement. Include:
- Exact formulation, manufacturer, regional technical data sheet date and safety data sheet.
- Selected dosage in both the plant’s working units and the project specification units.
- Reference, low-dose and high-dose trial results, including ASTM C157 conditions and laboratory qualifications.
- Fresh-property data: slump or flow, air, temperature, density, setting observations and strength requirements.
- Compatibility confirmation for cement, supplementary cementitious materials, air entrainer, water reducer, retarder, accelerator and other admixtures.
- Batching sequence, dispenser calibration record, mixing time and rules for jobsite water additions.
- Curing method, joint layout, expected joint spacing and the crack-control measures that remain independent of ECLIPSE.
- Acceptance criteria and a process for handling a load that falls outside air, slump, temperature or set requirements.
Before construction, have the concrete producer, testing laboratory, installer and design team sign off on the same mixture identification. Requalify if the cementitious materials, aggregate source, admixture package, water content, curing regime or exposure changes materially.
Where can the technical documents be found?
Use the manufacturer’s current documents rather than an archived quotation or an unverified reseller listing. The primary references are the US ECLIPSE 4500 technical data sheet, the US ECLIPSE Floor 200 technical data sheet, and Chryso’s TB-1000 technical bulletin. Confirm availability, handling instructions and local compliance with the supplier before the first production batch.
Frequently Asked Questions
Can ECLIPSE eliminate concrete cracks?
No. It targets drying-shrinkage strain, while cracks can also result from thermal movement, restraint, settlement, plastic shrinkage, poor curing and joint or reinforcement details. Use it alongside a complete crack-control design and verify the actual mixture.
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Is ECLIPSE 4500 the same as ECLIPSE Floor 200?
They are separate formulations with different documented application scopes. Floor 200 is positioned for indoor slab-on-grade work and has its own ASTM C494 Type S statement; do not transfer that statement to ECLIPSE 4500 without current product documentation.
Can ECLIPSE be added at the jobsite?
The US ECLIPSE 4500 sheet generally places addition after dry materials and most of the water, with plant-controlled mixing. Any field addition or water adjustment should follow the current supplier instructions and be recorded because it changes concentration and fresh-concrete behavior.
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Does a lower ASTM C157 result guarantee longer floor-joint spacing?
No. Joint spacing also depends on slab geometry, restraint, curling, temperature, reinforcement, curing and construction timing. Treat ASTM C157 as one qualification input, then have the design team confirm the joint layout for the actual floor.
What documents should be checked before specifying ECLIPSE outside the United States?
Obtain the technical and safety data sheets for the product supplied in that country. US dosage guidance and UK product-page results may describe different regional formulations, so local dosage, classification, handling and performance claims must be confirmed separately.
