(gÉrÄ­l`É) [Span.,=little war], fighting by groups of irregular troops (guerrillas) within areas occupied by the enemy. When guerrillas obey the laws of conventional warfare they are entitled, if captured, to be treated as ordinary prisoners of war; however, they are often executed by their captors.
The Inside Story â Concrete Is Porous. Most people do not realize that concrete is porous â more porous than Swiss cheese! The pores constitute 12 â 18% or more of the concrete but they are invisible, much smaller than the diameter of human hair. After new concrete is poured, almost half of the water has to evaporate.
Concrete is a surface that presents a number of challenges to paint in terms of adhesion and long-term durability, especially on horizontal concrete walking surfaces. Test the concrete for porosity and moisture content. Smooth concrete with little or no porosity will not have sufficient texture for paint to gain strong adhesion.