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How did Isaac Charles Johnson contribute to the development of portland cement?
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Cement
The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.
Isaac Charles Johnson is credited with producing the real prototype of portland cement around 1850 in southeastern England.1
While the invention of portland cement is typically attributed to Joseph Aspdin, who patented a synthetic mixture of limestone and clay in 1824, his original product may have been too lightly burned to qualify as a true portland cement. Johnson’s development refined the process, creating a material that more accurately represents the modern standard for this essential building material.1