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The Possibility Of Using The Recycled Concrete Aggregates In Hot Mix Asphalt

امكانية استخدام الحصويات البيتونية معادة التدوير في الخلطات الاسفلتية الساخنة

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 Publication date 2015
and research's language is العربية
 Created by Shamra Editor




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The recycled concrete aggregate RCA was able to take the place of the vierge & natural aggregate NA, embankments elected,to implement the base&subbase road layaers and airports in many country of the world.furthermore, there is almost consensus by a large of reshershers and scholars about the possibility of using RCA in mix cement concrete for non-structural elements .whil,the using of RCA in the hot mix asphalt HMA still under discussion and debate, due its high porosity , high water absorption, and its heterogeneity which reflected negatively on the mechanical and physical properties of the HMA This research discusses stadying the possibility of using the recycled concrete aggregates in hot mix asphalt HMA, for the implementation of the bas layer bituminous road , by the application of the marshall tests on hot mixtures asphalts have ben prepared using different ratios of recycled concrete aggregates. The results of marshall testes showed that the HMA prepared with amount of recycled concrete aggregates less than 50%,can be used to implement the base layer bituminous road,according to the general terms and specifications book for road works and bridges in the syrien arab republic.



References used
O'MAHONY, M.M. Recycled Of Materials In Civil Engineering. A Thesis Submitted To The University Of Oxford For The Degree Of Doctor Of Philosophy New College Trinity Term 1990
FderalHigway AdministrationFHWA : Recycled Materials Policy Administrator'smessage.2002
FderalHigway AdministrationFHWA:Transportation Applications Of Recycled Concrete Aggregate.FHWA, State of the Practice National Review -September 2004
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The large increase in the volume of demolition concrete waste and its impact on the environment has led to reconsider of using concrete demolition rubble as a partial or a whole alternative of natural aggregates to produce new concrete which has th e required properties to use in engineering constructions[1]. With the possibility of improving the mechanical properties of this concrete by processing this aggregates before using it or support this concrete with fiber to improve its structural behavior. This research deals with the study of the replacement the natural aggregates used in concrete with recycled concrete aggregates resulting from the demolition rubble , according to different replacement ratiosranging between 0 % -25 % -50 % -75 % -100% and the impact on the concrete behavior with a natural aggregates and determine the optimal replacementpercentage. The results showed a relative decrease in the concrete resistance on the simple pressure , limited decrease in the volumetric mass also, and a slight adjustment to the behavior of concrete under the loading effect by increasing the replacement proportion of the natural aggregateswith recycled concrete aggregates..
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Using different alternative materials in concrete mix, and expanding the area of using these materials, is considered very important from scientific, economic, and environmental point of view. Especially the diversity in number of used aggregates. As a result, reduction in the cost of transportation saving the environment, and improving the properties of concrete mix may occur Basalt lava, and volcanic cines are widely present in Syria, but using lava is limited because the studies about Syrian basalt were not enough. The lack of proper mills or crushers to grind basalt to be good to prepare concrete mix. As a result, the investment of using Syrian basalt in preparing concrete mix was very limited. Investigating, and classifying the basalt quarries, is needed to find out if the Syrian basalt is convenient to prepare concrete mix, or bitumen mix. The purpose of this research in to use the natural resources in different Syrian areas in better engineering,environmental,and economical ways through the improvement of engineering sides, increasing the capability of concrete structures, better investment of quarries in Syria, and to get more economical benefit with minimum cost. In this research, an experimental study was achieved to evaluate the basalt in north Syria according to international standards and codes. The composition of basalt Ore was determined by petrogrphic study, with focus on the content of olivine in basalt, and the degree of deterioration.
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