Exp2_week2

Research on Materials:

Concrete
the process of making：Concrete is comprised of different sizes of aggregate, sand, admixtures, water, and Portland cement. These raw materials are stored in silos or tanks on the site of the concrete plant. A computer-controlled dispensing machine selects and carefully weighs the materials needed to make the concrete mix specified by the client. These materials are then placed in the concrete mixer. While being transported, the drum of the concrete mixer turns on its axis and mixes the concrete. Upon arriving at the construction site, the concrete mix has a uniform, homogenous consistency. Concrete mixer operators deliver the concrete to the site in accordance with the client’s specifications.
 how long they will last：After research the result shows the concrete can last 16,000 years

Glass

the process of making： Glass is manufactured by melting sand, soda ash, dolomite and limestone together to produce a 3660mm wide continuous ribbon of glass.
 how long they will last：glass can last for very long time, like millions of years


Marble

the process of making：
1.Meltdown2.Injection3.Cutting and cooling
 how long they will last：about 200years