A few nice midi 5 miles images I found:
Concrete
Image by Joost J. Bakker IJmuiden
Concrete
Concrete is a composite construction material, composed of cement (commonly Portland cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravel or crushed rocks such as limestone, or granite, plus a fine aggregate such as sand), water, and chemical admixtures.
The word concrete comes from the Latin word "concretus"
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