About Cement

The products we use

Clinker Cement for Waterproofing

Clinker

Cement on its own is a most interesting and complex material: There are dark greyish/brownish spherical stones called clinkers of varying sizes which are crushed to a fine powder to make the cement in the bag.

Cement Strength

Cement gets stronger with age

When you add clean water to the grey cement powder a number of chemical reactions begin and stone begins to form as the water reacts with the ingredients of the cement. This is called hydration.

History - Innovation

Joseph Aspdin took out a patent in 1824 for “Portland Cement,” a material he produced by firing a mixture of finely-ground clay and limestone. What Aspdin did that was different was to calcine the limestone (heat it to just below the melting point), then mix the lime with clay and fire it again. He called the product “Portland Cement” because it resembled Portland stone, a widely-used building stone in England.

Cement Production

History - Discovery

While Aspdin is usually regarded as the inventor of Portland cement, Aspdin’s cement was not produced at a high-enough temperature to be the real forerunner of modern Portland Cement. His son, William, found that a higher temperature (around 1400 Celcius) was beneficial. At this increased temperature, a small proportion of the material melts but the bulk of it remains solid. This process is known as sintering and it produces a material called clinker.