When Joseph Aspdin produced the first Portland cement back in 1824, he knew he had a superior product. The English bricklayer had accomplished his feat by burning a mixture of limestone and clay in his kitchen stove. Although Joseph lived to see his product used in buildings and construction, it is unlikely that he could have imagined the tremendous industry that would grow out of his discovery. In 1970, for example, about 1 ton of Portland cement concrete was produced for every person in the world.(1)

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