An Experimental Study on Use of Road Demolition Wastes as Recycled Materials in Pavement Construction (original) (raw)
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Utilization of Construction & Demolition Waste in Road Sector
Construction waste management is a quite important, economical and environmental deal for our societies. The need to manage construction and demolition waste (CDW) has led to environmentally-friendly actions that promote the reuse and recycling of this type of waste. In the last two decades, a variety of recycling methods for construction and demolition wastes (CDW) have been developed.It is estimated that the construction industry in India generates about 10-12 million tons of waste annually. Projections for building material requirement of the housing sector indicate a shortage of aggregates to the extent of about 55,000 million cu.m. An additional 750 million cu.m. aggregates would be required for achieving the targets of the road sector. Recycling of aggregate material from construction and demolition waste may reduce the demand-supply gap in both these sectors. The scarcity in the availability of aggregate for the production of concrete is one of the important problems facing b...
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.
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Pavement recycling is becoming an important alternative worldwide for maintenance of highways, once sustainability and environmental issues have continued to receive more attention. The existing road surface asphalt mix has been 100% reused and recycled with new admix added as designed. By comparing all methods, hot in place recycling method is the best method for the maintenance of highway (flexible pavement) by surface recycling. India is faced with a challenge of the urgent need to rehabilitate the existing roads as well as to construct new roads under growing concerns with energy prices, aggregate shortages and the global warming. The reference point is that of considering the use of road materials in a closed cycle, in which a natural material, previously used in road construction, should not be rejected in the following life-cycle. The objective of this paper is that of analyzing flexible pavement recycling alternatives techniques, including reclaimed material from flexible pavements recycled with emulsion, cement and reused in a hot-mix. With the results obtained from the pavement design, the cost savings of using recycled materials in the different pavement structures were quantified and compared to a standard option, where new natural aggregates and binders would be used. In this analysis, the consideration of the reduction in the disposal of reclaimed pavement materials was also addressed. The results of this research will support the production of specifications, thus facilitating a more accurate reuse of natural resources, assisting in the protection of the environment, as well as in a more effective use of financial resources available for the activity of pavement maintenance and rehabilitation.
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.
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Recycled concrete and marble materials from construction and demolition operations are disposed in landfill sites. Concrete accounts for around 60% of waste in the U.S. in addition, landfill area and the guidelines govern their procedure becomes more serious. Environmental, it is important to recycle the landfill materials when it is possible as it sustain the natural resources to the coming generations. Moreover, the authorizing process for aggregate quarries has become a difficult task for contractors due to increased environmental regulations to sustain the natural resources. The aims of this paper are to evaluate the alternative usage of the recycled concrete and marble as well as marble dust for different road layers. The experimental program was carried out through different stages starting by evaluating the use of course aggregate in asphalt pavement mix (not in this research scope). The second stage was to develop different blends (S1 to S9) between dolomite stone, lime ston...
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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.
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...
A Study on Utilization of Recycled Aggregate and Pond Ash in Road Construction
TJPRC, 2013
An excellent road network is an asset to any developing country and India in particular as it is one of the largest countries in the world and a perfect road network would complement its development. The road transport forms the arterial infrastructure to facilitate trading and transport of passengers and commodities. A flexible pavement which is the mostly used form of pavement has four component layers namely surface, subgrade, Sub-base and Base courses. Which are comprised of materials like natural aggregate, sand, Morrum etc, are proved to be costly affair in terms of construction as well as maintenance. For the purpose of easy maintenance and cheaper construction maintaining the same quality, materials obtained from demolishment activities and industrial wastes like recycled aggregate, pond ash, fly ash, bottom ash, GGBS can be used. For this study a combination of recycled concrete aggregate and pond ash mixed at different proportions has been studied for geotechnical characteristics such as compaction, gradation and strength characteristics. The pond ash has been used as a replacement to the material below the size 4.75mm . The results from this study are there by used in evaluating this combination of materials can be used in the pavement design and construction. Maximum CBR value was obtained at 30% dosage of pond ash is 55. From the experimental data, it is also seen that a dosage of 30-40% of pond ash to the recycled aggregate generates CBR values greater than 60% can be used for base course and greater than 30% has a sub base course materials as a replacement to natural aggregate and sand.
Construction and Building Materials, 2012
This paper evaluates the behaviour and the environmental impact of a mixed recycled aggregate from non-selected construction and demolition waste (CDW) in field conditions. For this purpose, one experimental unpaved rural road with two sections was built. Sections were formed with a poor subgrade (A-6) and two structural layers: the first section consisted of a base course and a surface built using a natural aggregate and a low quality mixed recycled aggregate, respectively, and the second section, which was used as a reference, consisted of a soft crushed limestone aggregate. The materials were previously characterised in the laboratory. Control compaction ensured that the materials were correctly set in place, and the bearing capacity of each fill layer was measured. The structural performance of the pavement was determined using a falling weight deflectometer, and the changes in the international roughness index and the bearing capacity over time were studied. The results show that the non-selected CDW can be recycled using a simple treatment to create low quality recycled material with a low embodied energy that can be used as an alternative to natural aggregates in unpaved rural roads. According to the technical specifications, the total sulphur compound (SO 3) and the soluble salts content can rise to 3.9% and 3.3%, respectively, without posing a sulphate leaching risk or a reduction in the quality of this type of work. This study is important for increasing recycling rates of non-selected CDW and will support sustainable development in the building sector.