Kelly Ball Apparatus Manufacturer,Supplier and Exporter in India
Product Code : TVT-CTE-10470
The Kelly Ball Apparatus is a simple penetration device for measuring the workability of fresh concrete on site, built from solid machined steel with a rust-resistant finish, offering a quick alternative to the slump test that can be used directly on concrete still in the form or on a flat surface.
How It Works
The apparatus consists of a 152mm diameter hemispherical steel ball weighing approximately 13.6 kg (30 lb), mounted on a calibrated graduated stem inside a tripod-style frame with handles. The ball is lowered gently onto the surface of the freshly placed concrete under its own weight, and the depth to which it penetrates is read directly off the calibrated stem. Greater penetration depth indicates a more workable (wetter, less stiff) mix; the reading can be correlated approximately with slump values for the same mix.
Technical Specifications
Ball weight, stem length and frame dimensions are confirmed on the quotation. Tell us the test method you follow when you enquire.
Applications
Used as a rapid, alternative field test for the workability of fresh concrete following the ball-penetration method of ASTM C360 (Ball Penetration in Freshly Mixed Hydraulic Cement Concrete). ASTM withdrew C360 in 1999, but some highway agencies still publish a ball-penetration method, for example California Test 533. The test is particularly useful for quick on-site checks where a full slump-cone test set-up is less convenient.
Related Products & Category
The Kelly Ball Apparatus is part of our Concrete Testing Equipments range. Other products in this range include Slump Cone Test Apparatus and Portable Slump Cone Apparatus.
Frequently Asked Questions
How does the Kelly Ball test differ from the slump cone test?
The Kelly Ball test lowers a weighted hemispherical ball onto the concrete surface and reads penetration depth directly, giving a faster single-reading check, whereas the slump cone test measures the vertical settlement of an unsupported concrete cone after mould removal — the slump test being covered by ASTM C143 and IS 1199, and the ball-penetration test by the former ASTM C360.
Can this test be used directly on concrete already placed in formwork?
Yes — one advantage of the Kelly Ball method is that it can be used directly on the surface of concrete already placed on a slab or in a form, without needing to remould a separate sample as the slump test does.
Request a Quote
To get a quotation for the Kelly Ball Apparatus, tell us the test standard you work to, the quantity and the delivery location. Request a quote from Tvet Equipments.
Last updated: September 2026
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