Aggregate is the granular material used in asphalt concrete mixtures which make up 90-95 percent of the mixture weight and provides most of the load bearing characteristics of the mix. Therefore, the quality and physical properties of the aggregates are critical to the pavement performance. The following is recommended:
(10) An aggregate's specific gravity and absorption characteristics are extremely important in proportioning and controlling the mixture. It is recommended that AASHTO T-209 be used to determine the maximum specific gravity of asphalt concrete mixes. States not using AASHTO T-209 should be aware of the difficulty of determining the theoretical maximum density using individual ingredient specific gravities and their percentages in the mixture. These difficulties will result in inaccuracies in determining the specific gravity of the mixture. These inaccuracies will carry through to the calculation of the densities in the compacted mat and may result in improperly compacted pavements. It is also necessary to determine the bulk dry specific gravity of the aggregate in order to determine the voids in the mineral aggregate (VMA).
The target value for VMA should be obtained through the proper distribution of aggregate gradation to provide adequate asphalt film thickness on each particle and accommodate the design air void system. In addition, tolerance used in construction quality control should be such that the mix designed is actually produced in the field.
In the field of civil engineering, material engineering is the development of concrete, mix asphalt concrete, and strong metals such as steel. Alloying is another aspect of materials engineering.
Please provide the answer to above question.
Common material used is asphalt, followed by concrete, but roads can also be made from brick and gravel. Material selection involves choosing the best option for the given conditions.
some kind of rock
steel
M40 Concrete ratio 1:1.65:2.92 (cement:FA:CA)W/C ratio = 0.4As per Indian Standards.
1:4:8
1:2:4
1:1:2
How to mix 4500 psi cement?
the strength of concrete is effected by water /cement ratio as the water/cement ratio increases the strength of the concrete decreases
1:2:41 :2:3
1:2:41 :2:3
Constructions, making concrete, for road construction, for mixing with asphalt, as construction fill, and in the production of construction materials
The water/concrete ratio, not mixing it well enough, quality of raw materials, the age of the concrete, and the temperature and humidity of the area surrounding the concrete.
1:1.5:3:0.45 (cement,fine aggregate,coarse aggregate, water cement ratio)
There is no set ratio for a concrete requiring a compressive strength of m50. It is usually created according to the factors of the site condition and location.