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RESULTS FOR HISTORY OF CONCRETE


The Romans used concrete to build major structures, and its use was known for thousands of years before that. After this period, concrete use disappeared until the seveneeth century when engineers rediscovered it and began experimenting with its constituents. Portland cement was developed in the 1820s, and steel reinforcement was introduced in the mid-1800s. During the twentieth century, a variety of admixtures were developed to change the properties of concrete.