November 17, 2009

Terms of Confusion

by Bob Murphy

Many times coating projects can be held up due to confusion in defining terms that are used during the process coating of concrete. This is an attempt to clear up some of the potential confusion.

Acid etching: application of acid (typically muriatic acid) to clean or alter the concrete surface. Best used when there is no alternative method of surface preparation can be used. Must be flushed with copious amounts of fresh water and pH levels should be checked prior to coating application.

Broadcast: to toss granular material, i.e. sand, quartz etc, so that a thin, uniform layer is obtained

Cathodic protection: corrosion protection for reinforced concrete. Two types; impressed current, uses an external power supply to force small amount of electric current through the reinforcing steel to counteract the current flow caused by the corrosion process. Sacrificial, does not require an external power supply, a metal is used that is less noble (More prone to corrosion) than the reinforcing steel

Cracks: there are three types of cracks commonly seen in concrete 1) Active-the mechanism causing the cracks is still at work, any crack that is still moving, 2) Dormant- cracks that are not currently moving or of minimal movement that will not effect the repair, 3) Crazing- a series of fine, random cracks or fissures in the surface.

Saturated Surface Dry (SSD): describes the condition of the aggregate in which the pores in each particle of the aggregate particle are filled with water and no excess water is on the particle surface.

These are just some of the terms that can lead to confusion and potential conflicts to the coating of concrete.

Comments (2)

  1. November 18th, 2009 at 10:24 am

    Thanks for the quick article. We are always looking for ways to keep things running smooth at the office, and this list is going to help.

  2. November 18th, 2009 at 11:33 am

    Thanks for the comment!

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