ABSTRACT
All concrete surfaces may be expected to have a degree of resistance to wear but particular uses of buildings or infrastructure demand the explicit specification of abrasion-resistance. As an aside it may be worth noting three circumstances that give rise to soft floor surfaces that perform badly under even light traffic. The first is through carbonation of immature concrete surfaces, typically during cold-weather construction through elevation of carbon dioxide levels from unventilated heaters. The second arises from use of excessively wet mixes and where the bleed water is mopped up by the sprinkling of cement during finishing operations. The third circumstance is where the surface is excessively wet through over-trowelling.
