EUROLAB, together with its state-of-the-art accredited laboratories and expert team, provides precise and rapid testing services within the scope of the COE CRD-C130 test. This standard describes the method of estimating the amount of soft particles in coarse aggregates based on scratch hardness.
It is intended to be used to describe materials that are soft, particularly so weakly bonded that the individual particles in the part can be easily separated from the mass.
The test is not intended to identify other types of harmful materials in aggregates that should be specified separately in the specifications. Nor is it intended to imply that certain types of aggregates, such as limestone, whose mineral components may be relatively soft but well bonded together, will not perform quite adequately in concrete or other end products, even if it is possible to form a groove in the concrete.
This recommended practice is primarily for field use in estimating the quality of the coarse aggregate deposit. It will be helpful in the laboratory and, when used with visual inspection, will provide a quick and convenient way to quantify the soft particles in the aggregate.
Testing can be useful for preliminary screening of bulk resources, but should not be considered for specification implementation. In any case, a scratch test should be performed on a freshly cracked surface of the aggregate particle.
If the particle contains more than one type of rock and is partly hard and partly soft, it should be classified as "soft" only if the soft part is one-third or more of the volume of the particle. Scratch hardness tests can be performed on the exposed surface of a particle, provided that the surface softens due to weathering.
A particle with a fine, soft, weathered surface and a hard core should normally be classified as "soft".
EUROLAB assists manufacturers with COE CRD-C130 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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