abandoned warehouses in boston, massachusetts are being renovated or torn down in order to build new structures. on this site is the former central power system, built in 1890. when built, this power station was considered to be the biggest electric generating plant in the world.
for this reason, plants with highly seasonal demand usually have very large clinker stores. cement milling is the largest user of electric power on a cement plant, and because they can easily be started and stopped, it often pays to operate cement mills only during 'off-peak' periods when cheaper power is available.
this process, and the moving and blending of the slurry, require careful control of the slurry viscosity. clearly, a thinner slurry is easily obtained by adding more water, but at the expense of high energy consumption for its subsequent removal. in practice, the slurry is therefore made as thick as the plant equipment can handle.
the alkali–silica reaction asr , more commonly known as 'concrete cancer', is a swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive non-crystalline silica found in many common aggregates, given sufficient moisture.
file:concrete mixing plant, birmingham, alabama, view 2.jpg. size of this preview: 480 × 600 pixels. other resolutions: 192 × 240 pixels 384 × 480 pixels 614 × 768 pixels 819 × 1,024 pixels 6,888 × 8,610 pixels. this is a file from the wikimedia commons. information from its description page there is shown below.
the benefits of pozzolan use in cement and concrete are threefold. first is the economic gain obtained by replacing a substantial part of the portland cement by cheaper natural pozzolans or industrial by-products. second is the lowering of the blended cement environmental cost associated with the greenhouse gases emitted during portland cement .