Conclusion

As our country is a developing country we everyday need better roads for transportation, for comfort while traveling and other purposes. The grade or quality of road depends on the percentage of asphalt, stone size and on skill of labour. Here main importance should be given to mixing and crushing of stone for the construction of flexible pavement. Here we observe how mechanical processes improve the quality of the civil engineering works such as road construction, building construction, bridges etc.

The hot mix plant also includes stone crushing plant from where we get stone aggregate for other constructional activities.

Bad management of stone aggregate and dust entering the mixing drum affects the binding property of bitumen with stone and also the other properties such as durability, load carrying capacity etc.

For removal of dust from stones two processes are done:

a) water spraying method

b) by blowing air current

Hot mixing plants are one of the main sources of environmental pollution mainly air and noise pollution. So their location is always preferred out of the city.

Due to emission of dust and large noise and machine vibration it badly affects the health of the workers.

The recovery of heat from flue gases is not done which reduces the efficiency of insulated bitumen tank.

Climatic condition such as rainy season reduces the output of plant and also affects other components of plant