Home > How profile grinders work

How profile grinders work

Supplier News
article image The profile grinder can be used on-site on structures that have been subjected to chloride ion ingress

Profile grinders from Germann Instruments are used to accurately determine chlorine ion ingress on concrete surfaces by obtaining concrete powder through precision grinding at small depth increments.

The profile grinder can be used in the laboratory following ponding of specimens, or on-site on structures that have been subjected to chloride ion ingress. The chloride ion diffusion coefficient can be estimated from the chloride ion content profile and used for service life calculations.

A grinding bit attached to a grinding machine that is held against the surface by a grinding plate, grinds the concrete to a fine powder at selected, exact depth increments. The grinding takes place by working the bit over the surface in three rotations.

A battery-operated vacuum cleaner (Dust Buster) containing a reusable filter is used to collect the powder produced at each depth increment. On a vertical face, the powder is collected in a plastic bag attached to the grinding plate.

For every depth increment of 0.5mm, approximately 5 grams of powder is obtained for analysis. The profile grinder takes about 4-6 minutes to obtain each sample.

The chloride content of the samples is determined in about 5 minutes via the Rapid Chloride Test (RCT) by detecting the amount of acid-soluble chlorides.

Germann Instruments profile grinders are available from Hylec Controls .

Newsletter sign-up

The latest products and news delivered to your inbox