opus caementicium

Isaac Kremer/ September 9, 2018/ / 0 comments

Ancient Roman masonry construction using undressed stones laid in a mortar composed of sand, lime, and pozzolan; in some Roman provinces, pozzolan was not used in the mortar. (Harris, 1977) Photo from Rome, Italy, 2025.

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About Isaac Kremer

IsaacKremer.com is the personal website of Isaac Kremer, MSARP, a nationally recognized leader in the Main Street Approach to commercial district revitalization with over 25 years of experience. Kremer, New Jersey's first certified Main Street America Revitalization Professional (MSARP), has served as founding executive director for organizations like Experience Princeton and the Metuchen Downtown Alliance, which won a Great American Main Street Award under his leadership. He recently became director of the Royal Oak Downtown Development Authority in Michigan.

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