美國NDT James W-M-255 低沖擊能量回彈機_建築檢測儀_量具_儀器、儀表_貨源

Purchasing Notes

Use this in conjunction with the V-C-9900 V-Meter MK III for rapid and accurate estimation of concrete strength.

The equipment should be verified for proper operation with W-C-7312 Test Anvil for calibrating James Test Hammers the calibration anvil at regular intervals.

The Low Impact Test Hammers shown here have an Impact Energy level of 0.54 ft. lbs. (0.735 Nm) and come complete with carrying case and carborundum stone.

Applications

Manual hammers for the quick and easy determination of the strength of concrete.

Lower impact energy for testing thin walled specimens, below 100 mm ( 4inches )

Ideal for testing small components

Ideal for testing rock cores, especially brittle rock

Paper roll and film testing

Features and Benefits

Easy to use manual calculation of the mean rebound number.

All James Test Hammers conform to:

ASTM C-805

USA

ASTM D-5873

USA

BS-1881-202

Grt. Brit.

ISO/DIS 8045

Intl.

EN 12 504-2

Europe

ENV 206

Europe

NFP 18-417

France

B 15-225

Belgium

JGJ/T 23-2001

China

JJG 817-1993

China

Product Details

The W-M-255 Low Impact Manual Test Hammer is the instrument used for the non-destructive testing of hardened concrete for thin wall thicknesses. The unit is also used on rock cores, it's low impact energy not damaging brittle specimens. This easy-to-use instrument provides a quick and simple test for obtaining an immediate indication of concrete strength in various parts of a structure. The minimum verifiable strength is 1400 PSI (10 MPa) to approximately 9000 PSI (62 MPa). All concrete test hammers measure the surface hardness of the material they are testing; this is then correlated to concrete compressive strength.

The Low Impact Test Hammer has a number of specialized applications. It is typically used for thin concrete specimens (between 50mm (2") and 100mm (4") thick) such as sidewalks, bridgedecks and some driveways. The unit can be used on plaster and morar as well to verify consistancy. The Test Hammer is also used on brittle rock cores wher a larger impact will damage the specimen. These units are commonly used to classify rock cores and brittle rock specimens. Finally, it is also suitable for paper and film rolls wher the larger impact energy of a standard hammer will damage the surface of the material being tested.

Paper and Film testing are a significant application for the Low Impact Manual Test hammer. Typically eight to ten readings are taken across the surface of the paper or film roll to determine if the edges are as tightly wound as the center, and that winding has been even through out. TAPPI specifies readings 25mm-75mm ( 1"-3" ) from the edge and 150mm ( 6" ) down the length of the roll. Rolls too loosely wound, or to soft will go out of round during shipment and storage. This will cause unwind speeds to be slowed thereby lowering productivity. Rolls that are wound too tightly or hard can burst or tear during transport, and storage.

The manual concrete test hammer, aka rebound hammer, schmidt hammer, swiss hammer, sclerometer, is the most widely used non destructive instrument for compressive strength determination. However, it typically has the largest coefficient of variation; therefore its result should be verified with another non destructive test such as the V-Meter MK III.

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