The figures show cement and concrete production stages, and it is obvious that producing concrete needs more time than cement because it has extra two steps in contrast with producing cement.
In the first step of cement production, limestone and clay are poured through the two rollers into a mixer. Then by means of a pipe, stuffs are conducted to a rotating heater. After heating, they break down to smaller pieces by the grinder. Furthermore, they are packed by bags after becoming cement.
In order to produce concrete, an amount of cement (15%) is mixed by water (10%) and then sand (25%) and gravel (50%) are added. All these four ingredients are mixed by using concrete mixer, and concrete is produced.
All in all, cement, needs more processes than concrete. On the other hand two gradients are mixed and crushing, mixing, rotating, heating and grinding septs are important to produce cement. However, after producing cement, for making concrete we only need to mix some ingredients.
- Increasing the price of petrol is the best way to solve growing traffic and pollution problems To what extent do you agree or disagree What other measures do you think might be effective 67
- The chart below shows the amount spent on six consumer goods in four European countries.Write a report for a university lecturer describing the information shown below. 73
- The two maps below show road access to a city hospital in 2007 and 2010 67
- The bar chart below shows the percentage of Australian men and women in different age groups who did regular physical activity in 2010 78
- The map below is of the town of Garlsdon A new supermarket S is planned for the town The map shows two possible sites for the supermarket Summarise the information by selecting and reporting the main features and make comparisons where relevant 61