Specific Weight of Asphalt in 1 m³: Weight of One Cubic Meter
Asphalt is a multicomponent mixture in which every part is important for a high-quality road surface. The main component is crushed stone: it forms a strong and stable framework, binding all parts into a single mass. Pavements for large, heavily loaded roads often contain up to 75% crushed stone.
In some cases an asphalt pavement does not require a very high density. For pedestrian sidewalks and roads used by passenger cars, sand is usually used. Together with crushed stone, sand acts as a binding component. Coarse granite sand is used for road paving. Other types of sand, such as river or soil sand, are not suitable because they significantly reduce adhesion to the surface and contribute to the spreading of the asphalt pavement. This happens because of the high content of various impurities.
Another important component of asphalt is limestone, or more precisely mineral powders based on it. Thanks to their properties, the substances bind together and form a monolithic structure. One useful property of mineral powders is the reduction of ground vibrations in places especially affected by such processes, such as tunnels and bridges.
The flowability of asphalt pavement is provided by a small bitumen content, usually from 5 to 10%. Its ability to flow under high temperatures simplifies asphalt laying and rolling. It is important to maintain the correct proportions of the components, because a high bitumen concentration can negatively affect road quality. This is especially noticeable in summer, when thermal load increases.
Asphalt Weight as a Key Factor for Proper Work Planning
To obtain a high-quality and durable road surface, it is important to calculate the specific weight of asphalt. It may vary depending on the asphalt type and composition. The table below gives values for different types of asphalt pavement.
| Type of asphalt pavement | Unit of measurement | Weight in 1 m³ |
| Natural asphalt | kg | 1100 |
| Mastic asphalt | kg | 1500 |
| Compacted asphalt | kg | 2000 |
| Asphalt concrete | kg | 2000 - 2450 |
| Fine-grained asphalt | kg | 2330 |
| Asphalt granulate (black crushed stone) | kg | 1600 - 1800 |
| Asphalt millings | kg | 1800 - 2000 |
Quality Characteristics of Asphalt Pavement
Today there are many varieties of asphalt that differ in their properties. The most common types of asphalt pavement and their characteristics are shown in the table.
| Type of asphalt | Component features | Advantages | Disadvantages |
| Cold asphalt | Limestone mineral powders are used as a natural plasticizer. | Easy laying without mechanical equipment; environmentally friendly; can retain its properties in frost down to -25 °C; does not require heating before laying; strong and elastic. | - |
| Mastic asphalt | High content of plasticizer and viscous resin. | Viscous; strong; durable; resistant to chemicals and moisture; good tire grip on the road; sound insulation; fast repair of almost any surface. | Expensive equipment is required for laying. |
| Hot asphalt | 95% stone and crushed stone bound with crude petroleum products. | The most common type of classic asphalt pavement. | Requires automated equipment for compaction. |
| Colored asphalt | Use of light-colored bitumen and coloring pigments. | Noise insulation; bright color that helps mark hazardous road sections; environmentally friendly composition. | High cost, up to 5 times more expensive than ordinary asphalt. |
| Fine-grained asphalt | Includes asphalt millings up to 20 mm in size. | Resists deformation during temperature changes. | Suitable only for upper pavement layers and does not have high strength. |
| Coarse-grained asphalt | Includes asphalt millings larger than 20 mm. | Has a rigid structure. | Mainly suitable for lower pavement layers. |
| Rubberized asphalt | Contains rubber additives. | High resistance to moisture penetration and less frequent repair due to increased strength. | High purchase cost, although service life can compensate for the expense. |
See also the articles about specific weight of concrete and specific weight of aerated concrete.
When building a road, the weight of one cubic meter of asphalt is often averaged. For dense asphalt concrete, a typical orientation value is about 2.2-2.5 t/m³, but the exact figure depends on composition, temperature and compaction.
Reuse of Removed Asphalt
To save natural mineral resources, asphalt reuse is an important issue. The method involves removing the old pavement, preparing reclaimed asphalt pavement and adding it to a new asphalt mix according to a specified technology. The mass of reclaimed asphalt depends on particle size, contamination, moisture and compaction, so calculations should use laboratory or supplier data rather than one fixed value.
Frequently Asked Questions
How much does 1 m³ of asphalt weigh?
The weight of 1 m³ of asphalt depends on the mixture type. As a guide, natural asphalt weighs about 1100 kg, mastic asphalt about 1500 kg, compacted asphalt about 2000 kg, and asphalt concrete about 2000-2450 kg.
Why does asphalt density differ between pavement types?
Mass is affected by mixture composition, the amount of crushed stone, sand, mineral filler and bitumen, compaction level, aggregate fraction and pavement purpose.
Can asphalt weight be calculated using one average density?
An average value is acceptable for a rough estimate, but procurement, transport and construction calculations should use data for the specific mixture or project documentation.