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Pavement recycling

The construction industry, as well as other sectors, are always concerned about reduction of available funds, uninterrupted supply of raw materials, energy saving and environment protection. [Pg.799]

To face the above concerns, there is a need to optimise the use of available funds, to optimise the properties of materials used, to minimise energy expenditure in all construction or maintenance/rehabilitation works and to find alternative solutions that will not damage, deteriorate or have a negative impact to the environment. [Pg.799]

A major contribution to the above concerns is re-using or recycling the materials of old pavements, such as asphalt mixtures (asphalts), concrete or base/sub-base material. [Pg.799]

Recycling may be applied to all layers of flexible and rigid pavements. This chapter emphasises on asphalt layer recycling and, to a lesser extent, on concrete slab recycling. Recycling of the unbound or hydraulically bound materials, although possible, is effectively restricted to pavement reconstruction works, which are not as common as maintenance and rehabilitation of asphalt layers. However, provided the unbound or cement-bound materials possess the required properties, the techniques and procedures followed are similar to those as in new pavement construction. [Pg.799]

The material removed from the asphalt layers to be re-used, hence recycled, containing bitumen and aggregates, is called reclaimed asphalt (RA), under European Union terminology, or reclaimed asphalt pavement (RAP), under US terminology. [Pg.799]


Keywords Asphalt concrete pavement, durability, pavement recycling, recycled hot-mixed asphalt concrete, re-recycling. [Pg.210]

This study of a test pavement using recycled HMA, in which the penetration of the old bitumen had been adjusted using new HMA, confirmed the durability of such a pavement and showed that it could maintain a comparatively good level of utility even after 15 years and 3 months of use. Also, with respect to the physical properties, we have found that the bitumen deterioration of layers of the HMA subject for public use was comparatively small and that the repeated reuse of pavement is indeed possible. Such a high evaluation of pavement recycling from the viewpoint of both utility and physical characteristics should broaden the possibilities for expansion into re-recycling. [Pg.221]

Cyclogen. [Witco] Asphalt pavement recycling agent... [Pg.94]

Smith RW (1980) State-of-the-art hot recycling (Transportation Research Board, Record No. 780), Proc National Seminar on Asphalt Pavement Recycling, Washington, DC,p 534... [Pg.172]

Pavement recycling offers conservation of natural resources and bitumen saving, energy saving, environmental protection and reduction of construction cost. [Pg.800]

Pavement recycling leads to conservation and protection of the environment, since the use of RA not only delays the opening of new quarries but also solves the environmental problem of deposition of reclaimed material. [Pg.802]

Pavement recycling can also result in a noticeable reduction in maintenance, rehabilitation or reconstruction cost. This is derived from reduction in asphalt production cost and reduction in transport cost of the material, which is substantial when in situ recycling is selected. [Pg.802]

Even though pavement recycling could result in the reduction of construction cost, this alone is not the decisive factor for selecting it. For most countries, conservation of energy and natural resources, environment protection and reduction of atmospheric pollution are the reasons why they embark on pavement recycling for all highway applications. [Pg.802]

Pavement recycling methods differ from the flexible to the rigid type of pavement. In flexible pavements, two basic methods are distinguished hot recycling (HR) and cold recycling (CR). Each one is further distinguished into in situ (or in-place) and in-plant (central plant) recycling. [Pg.802]

Figure 18.2 shows the general pavement recycling tree. [Pg.802]

Rigid pavement recycling is the procedure of crushing and fragmentising the concrete slab and re-using the fragmented concrete as coarse aggregate to produce a new concrete mix or base/sub-base material (stabilised or non-stabilised material). [Pg.803]

Milling usually takes place when the pavement surface is cold (ambient temperatures). However, sometimes the surface is preheated by a heating unit travelling in front of the milling machine. Heating of the pavement surface prior to milling is required only in flexible pavement recycling. [Pg.806]

Figure 18.5 Reshape process. (From Kandhal, P.S. and Mallick, R.B., Pavement Recycling Guidelines for State and Local Governments — Participant s Reference Book, FHWA-SA-97. Washington, DC Federal Highway Administration, 1997.)... Figure 18.5 Reshape process. (From Kandhal, P.S. and Mallick, R.B., Pavement Recycling Guidelines for State and Local Governments — Participant s Reference Book, FHWA-SA-97. Washington, DC Federal Highway Administration, 1997.)...
Cold recycling is a pavement recycling method in which no heating is required at any stage of work. The advantages and disadvantages of cold recycling are outlined in Table 18.4. [Pg.809]

The recycling of rigid pavements is relatively new compared to the recycling of flexible pavements. Recycling of rigid pavements started over the last 30-40 years mainly in countries that do not possess natural deposits for aggregate production. [Pg.820]

Finn EN. 1980. Seminar on asphalt pavement recycling Overview of project selection. Transportation Research Record, Vol. 780, p. 8. Washington, DC TRB. [Pg.822]

Stroup-Gardiner M. and T. Wattenberg-Komas. 2013. Recycled Materials and Byproducts in Highway Applications Volume 6 Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste. NCHRP Synthesis 435. Washington, DC TRB, National Academy of Science. [Pg.823]

Pavements need to be safe, durable, and cost effective. Advances in materials, design, construction, maintenance, pavement recycling, and management have improved performance significantly and changed highway engineering across the board. [Pg.825]


See other pages where Pavement recycling is mentioned: [Pg.182]    [Pg.132]    [Pg.217]    [Pg.210]    [Pg.212]    [Pg.799]    [Pg.799]    [Pg.800]    [Pg.801]    [Pg.802]    [Pg.803]    [Pg.805]    [Pg.807]    [Pg.809]    [Pg.811]    [Pg.813]    [Pg.815]    [Pg.817]    [Pg.819]    [Pg.821]    [Pg.823]    [Pg.863]    [Pg.201]    [Pg.330]   


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