Development of Asphalt Pavement
[2016/5/10] Clicks:[656]
As of 2014, the total mileage of all levels have reached about 5 million kilometers, ranking second in the world. However, China's overall road Pavement rate is still low, China still has 32% of the roads are not paved roads, 11% of the road is easy paved road, while in developed countries, unpaved roads and pavement Easy the total proportion of generally 25% or less.
In China already paving roads among the proportion of asphalt concrete pavement is only about 950,000 kilometers, accounting for 19% of total mileage, concrete accounted for 38%, it is still the main structure consisting of highway pavement, and American asphalt Pavement of 3.3 million kilometers, accounting for more than 50% of all roads, both of asphalt Pavement penetration rate is still there is a big gap with the developed countries.
From a global perspective, although the asphalt pavement is still the main trend of the future, but China's cement production accounts for 60% of the world's total, and low price compared with other countries, laying cement concrete pavement and more convenient to use than the asphalt practical. Thus, in the early stages of economic development, in the absence of economic and financial base, pavement structure of cement concrete road has long been based, and from our special conditions, the future of China's cement concrete pavement will remain president of accounting time on asphalt pavement.
However, compared to the cement pavement, asphalt concrete is a set of elastic, plastic and viscous as one of the materials with good mechanical properties, flexible pavement, to noise damping, driving more comfortable, and in the construction and road maintenance aspect, compared with cement road convenient, and staging transformation and recycling. Thus, although the high cost of asphalt pavement, but with the continuous improvement of China's economic and social development and traffic, load, and social requirements of the road quality is also rising, and the proportion of asphalt pavement penetration will continue to grow.
From the historical point of view road construction, urbanization and road building and asphalt demand growth is closely related to the initial urbanization, asphalt demand growth will be substantial growth, urbanization and over 60% in the future, with the improvement of the trunk road network, bitumen demand growth is also slowing down. For example, in 1980, the US urbanization rate reached 66%, which is also the backbone highway basically completed, in 1980 the United States bitumen consumption has reached 31 million tons, after its asphalt demand growth significantly reduced to less than 5% in after 2005, consumption reached the historical peak of 35 million tons, declining demand from asphalt. While China's current urbanization rate close to 60% is expected in 2020 will reach about 65% -70%, therefore, in 2015-- during the "Thirteen Five-Year Plan" in 2020, China's new highway projects will enter the final finishing stage, While the construction boom will inevitably inferior to the "Eleventh five-Year" and "five-second" stage, but because of the ongoing transformation of the existing pavement and maintenance, is expected next five years of asphalt demand is still expected to maintain positive growth, demand is expected to reach 30 million tons of asphalt . And after 2020, with the trunk road network will be basically sound, 2020--2030 annual consumption will be a slight decline, but volatility is expected to remain at 25 million tons or more. (Source: Internet)
