The slope of curve obtained between the number of blows and water content in the cassagrande’s method is ______

Bitumen is a by-product of ______

The unpaved shoulder usually consists of ______

The dividing and operating of aggregates into different sizes is called ______

The minimum grade of concrete required for pavement design is ______

Which bitumen does not need heating?

The flakiness index for surface dressing should not exceed ______

The waste material mostly used in pavement is ______