Concrete Bots and Coal

The world has been built from concrete, making it the most widely used building material, for centuries. Even today, roman cement is being studied and researched because of its tremendous ability to withstand time. In it’s simplest form, concrete consists of small particles of a hard material (known as aggregate) bonded together by a cement and water, but there’s a huge amount of chemistry involved in finding exactly the right combination of ingredients. The most common form of cement is known