Catalogue of Pavements with Recycled Aggregates from Construction and Demolition Waste (original) (raw)
Related papers
The industry of civil construction generates huge amounts of wastes during the construction of new buildings and the demolition or reformation of old structures. Construction and demolition wastes (CDW) comprise soils from excavations, asphalt concrete from old pavement surfaces, and a large variety of material from buildings, such as concrete, ceramics, sand and rock chips, gypsum boards, among others. These materials may be recycled and reused for the construction of road pavement layers. This kind of application was chosen taking into account the large amount of materials required and the possible economic impacts. CDW was recycled to produce aggregates that could be used as granular layers or asphalt concrete. The materials were used raw or mixed with other ingredients. The research shows the pros and cons of using recycled aggregates in different pavement layers. The major problem is related to aggregate crushing and high porosity. Overall the research concludes for the economic, environmental and technical feasibility of recycling construction and demolition wastes for pavement construction.
Using Recycled Aggregates from Construction and Demolition Waste in Unbound Layers of Pavements
Sustainability
Pavements are an expensive part of transportation infrastructures, as their construction and maintenance require large amounts of resources and materials every year and all over the world. A sustainable solution for considering environmental concerns about roads and pavements, in general, is utilizing recycled materials for their construction. This has been shown to lower the carbon footprint of the construction sector and to result in natural resource conservation, in reduction of harmful emissions and in minimization of overall costs for pavement construction and maintenance. One of the main groups of recycled materials which has attracted much attention since the end of the last century is construction and demolition waste aggregates (CDW). This paper reviews the completed studies referring to the use of the construction and demolition waste aggregates in unbound layers of pavements and compare the in-hand results from various engineering assessments of these aggregates and mixes...
Use of Demolished Recycled Aggregate for Pavement Construction: A Review
SKIT Research Journal, 2021
In today's scenario, availability of natural aggregates is diminishing and simultaneously the waste generation due to debris of demolished buildings is increasing considerably. Incorporationg these demolished materials into construction process can provide a respite from both these issues. The aggregate from demolished structures mainly consists of 70-80% of concrete components as per different studies, so it will be very beneficial for the environment to recycle this aggregate for construction works. In this paper a review of contemporary practices of use of recycled concrete aggregate in pavement construction has been done.
Use of Recycled Aggregates in Riigid Pavement Construction
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2011
The paper presents the actual stage of analysis and laboratory studies, undertaken in the frame of postdoctoral program “Develop and Support Multidisciplinary Postdoctoral Programs in Primordial Technical Areas of National Strategy of the Research–Development–Innovation” 4D-POSTDOC, aiming to produce recycled aggregates with physical-mechanical characteristics suitable for use in rigid pavement construction. Recycled aggregates under investigation are obtained by crushing of cement concrete from the demolition of buildings in Iasi municipality. The main objective of the research is to achieve a higher economic value of the cement concrete resulted from demolitions by recycling and use in the construction of conventional cement concrete pavements (PCC – plain cement concrete) and roller compacted concrete pavements (RCC). An important benefit resulting by using recycled aggregates in pavement engineering is the reduction of the impact of construction works on the environment by both ...
2020
1Research scholar, M. Tech, Department of Civil Engineering, Jagannath University Jaipur, Rajasthan, India 2Assistant professor, Department of Civil Engineering, Jagannath University Jaipur, Rajasthan, India 3Professor & Head, Department of Civil Engineering, Jagannath University Jaipur, Rajasthan, India ---------------------------------------------------------------------***---------------------------------------------------------------------Abstract – In the Roads and Highway construction the granular course layer such as GSB (Granular Sub Base) and WMM (Wet mix macadam) are the most important layer. With the use of these layers in Flexible Payment Road a stable surface can be formed. The constructions of roads consume natural valuable resources like aggregate which is costlier. The use of recycled aggregate instead of virgin aggregate helps in reducing the demand of extraction. If a new Road is formed over the existing road or if bridge is constructed over the existing road due t...
Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
Materials
Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from CDW, replacing natural aggregates (NAs) in the manufacture of precast concrete elements, such as kerbstones and paver blocks. The physical and technological properties of precast products formulated with RAs were analysed in accordance with current regulations, comparing them with those of commercial products manufactured with NAs. The results indicated that partial or total substitution of NAs by RAs increased the water absorption and apparent porosity values of the precast elements while reducing the bulk density and compressive strength. However, all units manufactured with RAs showed breaking load values higher than the minimum required by EN 1338 and, in some cases, slightly higher a...
Pavements Using Reclaimed Aggregates
Eco friendly construction techniques are gaining immense importance nowadays. Many innovations have come in pavement construction and design. The use of reclaimed aggregates in constructing pavements is one among them. Reclaimed aggregates come mainly from two sources - construction & demolition waste and asphalt pavements. The optimized use of reclaimed aggregates along with fresh aggregates helps decrease construction cost without compromising strength and durability. It also minimizes the use of virgin aggregate and helps decrease crude oil import for producing paving bitumen. Reclaimed material is first crushed and screened before using. Tests are then conducted to analyse its properties. Only those batches which satisfy standard conditions are used. Reclaimed aggregate pavements hence help pavement rehabilitation with minimum energy expenditure. This paper deals with the tests on reclaimed aggregate and their property study. The various sources and means of retrieving aggregate...
Use of Recycled Aggregate in the Construction of Low Strength Rural Rigid Pavements
In today's world due to the rapid industrialization, recycled aggregates play an important role in the construction activities for the preservance of natural aggregates. The study is to determine the suitability of recycled aggregates for the construction of rural roads, which will in achieving the economy for the road construction and also helps in protecting environment degradation in terms reducing the mining and pollution. For the construction of rural roads requires large quantity of fresh aggregates, replacement of fresh aggregates by recycled aggregates is considered in this study. In this project recycled aggregates were collected from the demolished building from chamarajpet, Bangalore. Various tests were conducted on coarse and fine aggregates. Grade of the concrete used is M30. Compression, flexural and split tensile tests has been carried out and compared the test results with the prepared control mix. Also the rigid pavement analysis has been carried out in FEM based KENPAVE software. Variation of middle, edge and corner stress is found for the different slab thickness. For the analysis single axle with single wheel and dual wheel are considered.