noun
: concrete that has had a vacuum applied through special mats, pads, or forms shortly after placement for the purpose of removing a portion of the mixing water not needed for the hydration of the cement
noun
: concrete that has had a vacuum applied through special mats, pads, or forms shortly after placement for the purpose of removing a portion of the mixing water not needed for the hydration of the cement
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012