Gyratory compactors for cement and concrete - GALILEO

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PRINCIPALES CARACTÉRISTIQUES

Concrete gyratory compactor

Test menu

Test set up

Schematic view of gyratory compaction

Ideal for mix design of the various types of No-Slump Concrete mixtures requested for production of: paving blocks, concrete paving slabs, rolled compaction concrete, masonry blocks, curbstones, roofing tiles, sewage pipes, hollow core slabs, structural members, extruded fresh concrete elements, concrete road construction with slip form paving finishers, in general directly stripped products.
Conform to Scandinavian standard NT BUILD 427 - Concrete, fresh: Compactability with IC-tester (intensive compaction tester).
Load cell fitted directly on the vertical actuator for accurate load measurement and feedback control
User defined axial stress and speed of rotation
Easy control using the integrated 7" colour touch-screen control panel or connected PC.
Real-time direct shear and torque resistance measurement. Automatic calculation of the compaction energy, an important parameter for Research (optional).
Automatic weight acquisition and density calculation with the integrated balance (optional).

DESCRIPTION GÉNÉRALE

This method, very popular in Scandinavia, is used for mix design and quality control mainly in concrete products plants, where low workable and zero slump concrete is used (for such products as hollow-core slabs, tubes and paving blocks).
The method is used for: mix design simulating selected production processes specimen preparation for strength test (fresh and cured) research of mix related phenomena (workability, curing time, admixtures etc.).

Compaction is achieved by the simultaneous application of a low-static compression and a shearing action, which results in the motion of the centre-line of the test piece, which generates a conical surface of revolution while the ends of the test piece remain approximately perpendicular to the axis of the conical surface.

The machine is equipped with 100 mm diameter mould with stripping accessory and processes in real time the evolution of sample density versus the number of cycles and plots the compaction curve.

It's possible to upgrade the machine in order to measure the Shear during compaction in kN/ m2. Shear is a measuring parameter useful for a deeper selection/ dosage and tuning of no-slump concrete components. For instance, a very small change in water and plasticizer can shift notably the positioning of max shear value along the compaction curve. Increase of water and plasticizer generally shift the max shear value toward the first gyratory cycles; instead the decrease of water and plasticizer shift the max shear toward the end of compaction.

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Technical specifications

Model	Galileo 54-C20C02
Consolidation pressure	25 – 2200 kPa for 100 mm diam.
Gyratory motion and Vertical load	Electromechanical
Angle adjustment	Manual
Gyratory angle range	0 -3° ±0.01
Gyratory angle measurement	Angle measured and displayed during test
Speed of gyration	5 – 120 rpm
Number of gyrations	0 -9999
Integrated Shear measurement	Yes (optional)
Moulds dimensions	dia. 100 mm x 250 mm height
User interface	7” 16:9 Touch screen color display (PC for data analysis)
Connection	LAN - Ethernet
PC Software	Available as option
Extruder	Hand-operated
Balance	Available as option with an accuracy of 1 g
Minimum specimen height	50 mm
Maximum specimen height	Up to 200 mm depending on mix type
Height accuracy	Better than 0,1 mm
Suitable for water pouring test	Yes
Dimensions (w x d x h)	480 x 900 x 2150 mm
Weight approx.	400 kg

Ordering info

54-C20C02
Galileo Concrete fully Electromechanical Gyratory Compactor. Includes 100mm dia. mould and manual extruder.
220 V, 50-60 Hz, 1ph.

54-C20C04
Galileo Concrete fully Electromechanical Gyratory Compactor. Includes 100mm dia. mould and manual extruder.
110V, 60 Hz, 1ph.

Accessories

Accessories

54-C20C02/SW
PC Software

Spares

54-C20C02/1
Cylinder mould, 100 mm dia., complete with top and bottom plates.

Additional Information

Workability of No-Slump concrete can be understood as behavior of compaction, filling in mould and stripping of fresh concrete after compaction. The behaviors are interdependent. A peculiar feature of the immediately stripped compacted No-Slump fresh concrete is its Green Strength.

No-slump concrete consists in earth-moist concrete (EMC) and in high plastic stiff consistency concrete characterized by slump value from 0 to 2 cm or Ve-Be time more than 5 seconds. These types of fresh concrete can be molded by mechanical actions and stripped immediately after the compaction process. This feature entails that fresh concrete compacted or extruded products, such pavers, building blocks, pipes, manholes, hollow core slabs and other specific products can be moved immediately after stripping and continuously transported from the production plant without distortion and damage to a storing ambient. This is a primary necessary condition for industrial production Similarly, slip form road concrete finishers can perform perfect paving for airports and motorways as the fresh layer keeps its shape unchanged. Less moistened fresh concrete can be rolled for road or dam construction. The fresh state of early mixed and compacted concrete is characterized by a special common cohesive feature: the green strength. It can also be defined as the attitude of compacted or extruded fresh concrete to keep the original shape thanks to a visco-elastic behavior until the cement starts to set due to hydration of cement components and to develop the usual strength. Green Strength is a cohesive strength given by the internal friction and relative interlocking between the granular finer particles and by capillary attractive forces that form at contact points of finer particles (liquid bridges).

The best performance of the compacted fresh concrete in accordance with the intended use of product is based on an accurate mix design. The proper selection of the components, like fine and coarse aggregate particle size distribution, the introduction of admixtures like ground blast furnace slag and silica fume, along with the dosage of cement , water and plasticizers, need a mix design supported by a testing system characterized by a high sensitivity to be capable to discriminate within small changes in order to transfer to production a tuned composition of the concrete mix. The system is accomplished by the Intensive Compaction Test (IC-Test) that is performed by the Concrete Gyratory Compactor as its compaction work is precise and definable.
The compaction of the specimen is achieved by the simultaneous action of a static vertical compression and of a shear action resulting of the rotary motion of the centerline of the test piece, which generates a conical surface of revolution, while the ends of the test piece remain perpendicular to the axis of the conical surface.

Concrete Gyratory Compactors produced by CONTROLS are fully complying with NT BUILD 427 Scandinavian test Standard that defines the method of intensive compaction specially developed to fresh no-slump concrete testing.