Recycling of Reclaimed Asphalt Pavement in Portland Cement Concrete (original) (raw)
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Laboratory investigation of portland cement concrete containing recycled asphalt pavements
Cement and Concrete Research, 2005
Recycled asphalt pavement (RAP) is the removed and/or reprocessed pavement material containing asphalt and aggregate. The use of RAP in asphalt pavement has become a common practice in the construction of new, and reconstruction of old, hot mix asphalt (HMA) pavements. But little research has been done to examine the potential of incorporating RAP into concrete. Since RAP contains asphalt, it is very likely that the toughness of concrete made with RAP could be improved. In the present study, the mechanical properties of RAPincorporated Portland cement concrete were investigated through laboratory experiments. Two types of RAP (coarse and fine RAP) materials were considered. The results from this study indicated that RAP could be incorporated into Portland cement concrete without any modification to the conventional equipment or procedures. Without any treatment, there was a systematic reduction in the compressive and split tensile strengths with the incorporation RAP in concrete. Notably, the energy absorbing toughness for the RAP incorporated concrete has been significantly improved.
Performance of Recycled Asphalt Pavement as Coarse Aggregate in Concrete
Recycled asphalt pavement (RAP) is the reclaimed and reprocessed pavement material containing asphalt and aggregate. Most RAP is recycled back into pavements, and as a result there is a general lack of data pertaining to the mechanical properties for RAP in other possible applications such as Portland cement concrete. In the present study, some mechanical properties of Portland cement concrete containing RAP as coarse aggregate were investigated in the laboratory. Six concrete mixes of widely differing water/cement ratios and mix proportions were made using RAP as coarse aggregate. The properties tested include the physical properties of the RAP aggregate, the compressive and flexural strengths of the concrete. These properties were compared with those of similar concretes made with natural gravel aggregate. Results of the tests suggest that the strength of concrete made from RAP is dependent on the bond strength of the asphalt-mortar (asphalt binder-sand-filler matrix) coatings o...
Effect of Reclaimed Asphalt Pavement Aggregate on Hardened Properties of Concrete
IJRASET, 2021
This paper purpose of study is to find the properties of Reclaimed asphalt pavement (RAP) and compare the same with the concrete produced with natural aggregates. This thesis presents a study conducted on mechanical and durability properties of Reclaimed asphalt pavement (RAP) aggregates concrete. The investigation covered concrete mixes at water cementitious material with ratio of 0.4. Ordinary Portland cement of 43-grade was used in this study. The percentage of Reclaimed asphalt pavement (RAP) aggregates that partially replaced natural aggregates by weight were 0%, 25%, 50%, 75%, and 100% with glass fiber The results show that the optimum replacement of Reclaimed asphalt pavement (RAP) with natural aggregate then gain strength of concrete compare with normal mix. It is observed that compressive and tensile strength of concrete gain upto with mix 50% NA+50%RAPA+1%SF after that increase percentage of RAP with decrease both strength compare with normal mix.
Use of Reclaimed Asphalt Pavement (RAP) in Concrete in Perspective of Rigid Pavements
2023
The demolishing of roads for repair and reconstruction produces an ample amount of Recycled Asphalt Pavement (RAP) which, if not utilized, may cause depletion of aggregate sources and pollution. The use of RAP in the plain cement concrete (PCC) is sustainable use of road waste material. However, the potential of incorporating RAP to replace natural aggregate needs to evaluate. This research targets the evaluation of mechanical properties of PCC made with extracted RAP materials through laboratory experiments and to achieve the optimized replacement of natural aggregate for rigid pavement composite design. The Virgin Coarse Aggregate (VCA) in PCC was replaced with RAP at 0:25:100 percent by weight. Results show that incorporating RAP in PCC causes a gradual decrease in mechanical properties. However, the decrease in compressive strength is more (57%) than the flexural and splitting tensile strength. RAP up to 25% was found as an optimum allowable replacement with VCA in the rigid pavement. From the Modulus Of Elasticity (MOE), it was detected that with the incorporation of RAP the ductility of PCC improved slightly.
International Journal for Research in Applied Science & Engineering Technology, 2020
The inappropriate use of Reclaimed Asphalt Pavement (RAP) leads to deterioration of environment and waste of money. Research studies show that RAP can be reused helping in sustaining environment along with saving a huge amount of budget. This study circulates around using RAP as a replacement of coarse aggregate in Concrete and then investigating RAP-Concrete under different temperatures. The mix design of concrete was done for 4000 psi. Concrete specimens were tested for physical as well as mechanical properties. Results showed that all the properties decrease with the increase in the replacement level of RAP in concrete specimens.
Reclaimed Asphalt Pavement Stabilized Using Crushed Concrete Waste as Highway Pavement Material
Advances in Civil Engineering Materials, 2012
Pavement rehabilitation and reconstruction generate a large volume of reclaimed asphalt pavement (RAP) waste. Also, large quantities of crushed concrete waste (CCW) are generated from building demolitions and constitute a principal component of municipal solid waste consisting of concrete, sand, brick, rock, metals, and timber. This paper present the results of a laboratory evaluation of the characteristics of RAPs stabilized using CCW with a view toward determining their suitability for use as flexible pavement material. The mixtures were subjected to British Standard light (standard Proctor) compactive efforts to determine the compaction characteristics and California bearing ratio (CBR). Test results show that the properties of RAP waste improved with CCW treatment. The maximum dry density decreased, and the optimum moisture content increased, with increased CCW content in the mixes. Optimum CBR values of 28.06 % (unsoaked) and 32.81 % (soaked for 24 h) were recorded for a 50 % RAP þ 50 % CCW mix. With the potential of a time-dependent increase in strength in view, the 50 % RAP þ 50 % CCW mix with a recorded CBR value of 32.81 % (soaked for 24 h), which satisfied durability requirements with insignificant water absorption, can be used as a sub-base material in flexible pavement construction. This research provides results of the evaluation of RAP waste stabilized using CCW as a highway construction material, as based on CBR determination. Further work may be encouraged in order to assess the resilient modulus of this material under cyclic load. secured from demolished pavements, soil and small quantities of bituminous concrete are found commingled in the excavated materials. Usually, the reclaimed concrete materials are hauled to a central processing plant where crushing, screening, and ferrous metal recovery are performed before stockpiling. Also, on-site recycling and processing can alternatively be performed with a mobile plant . The primary application of CCW in the United States is as an aggregate substitute in pavement construction . This practice has become so common that CCW aggregate is considered by many agencies as conventional aggregate . The use of CCW as a backfill material has apparently gained only minor interest relative to other applications [6]; however, it is reportedly one of the first waste materials considered for backfill applications . Roads are major consumers of aggregate, and the influence of aggregate cost is more on the total construction cost of the roads. In order to reduce the cost of road construction, the possibility of using building waste as aggregate in sub-base and base course has been studied .
RECYCLING RECLAIMED ASPHALT PAVEMENT IN CONCRETE ROADS
In France, maintenance of road surface layers generates approximately two million tons of reclaimed asphalt pavement (RAP) a year of which less than 10 % is recycled into road materials. In this context, a research has been initiated three years ago at LCPC in collaboration with ATILH to develop recycling of RAP into pavement hydraulic concrete.
Structural Evaluation of Cold Recycling Reclaimed Asphalt Pavement (RAP) Blends
The technique of cold recycling of asphalt pavement materials for road construction is widely used in the world. Different types of locally available stabilizing additives and/or agents were used to find the most suitable one from the point of view of strength, economy and environment. Cubic molds of (10) cm is used in the laboratory to prepare samples of the stabilized rap materials. The effect of curing mode (effect of water absorption) was studied from strength point of view. Increasing bricks sand in the stabilized RAP materials increase the compression strength because of filling the spaces. A brick sand increasing reduces the absorption in case of cement stabilizing while with lime increases the absorption. Dynamic modulus of elasticity decreases with bricks sand increasing. Cement ratio more than 5% alone or more than 3% with lime is recommended to use, lime stabilizing ratio not exceed 10%. Keywords: cold recycling, reclaimed asphalt pavement (RAP), crushed bricks sand, compression waves velocity and dynamic modulus of elasticity.
A DETAILED STUDY ON RECLAIMED ASPHALT PAVEMENT IN PAVEMENT QUALITY CEMENT CONCRETE
RAP (reclaimed asphalt pavement) produced from the reconstruction of asphalt road pavements is one of the alternative material proposed. Rap can be used as an alternative material for both fine and coarse aggregate, it is conventionally used as coarse aggregate in asphalt pavement. In this experimental study, Performance of Pavement Quality Cement Concrete(PQCC) is studied when virgin aggregates are replaced by RAP by conducting experimental study in laboratory and also performing numerical analysis on RAP concrete model cube by using ANSYS to find out stress value at different percentage of RAP and age of concrete under loading. Fine aggregate is replaced with RAP by 0%, 15%, 30%, 45%, 60% and Coarse aggregate with RAP by 0%, 15%, 30%, 45%, and 60%.Experimental results are validated with numerical results. It is observed that RAP will reduce the performance of concrete and affects mechanical properties of concrete like compressive and flexural strength, density on increasing the percentage in concrete. But for 15 % replacement, RAP concrete has fulfilled the requirements of M30 concrete and for 30%replacement compressive strength of concrete is 28.456 N/mm² which is very near to the minimum strength value of M30 concrete. For all mix proportion of concrete flexural strength is more than minimum required strength of M30 concrete. The results indicated that RAP can be used as an aggregate in PQCC up to limited percentage.
Assessing Shear and Compressive Strength of Reclaimed Asphalt Concrete
International Journal of Scientific Research in Knowledge, 2014
The prime objectives for this study are evaluating the performance of recycled asphalt concrete, investigating the effect of recycling agent type and amount on mixture performance, and studying the effect of inclusion of more reclaimed materials content into recycled mixtures. For this purpose, reclaimed materials milled from field, filler, virgin asphalt cement, and four types of recycling agents (used oil, oil + crumb rubber, soft grade asphalt cement, and asphalt cement + sulfur powder), have been implemented and were used to prepare recycled mixtures with nominal maximum size of 12.5 mm. The recycling agent that showed the best mixture performance was used to prepare recycled mixtures with different reclaimed materials contents. Mixtures were subjected to Double Punch shear, Compressive Strength, and index of retained strength Test. It was found that using soft grade asphalt cement as a recycling agent revealed better performance than other types of recycling agents. For recycled mixtures with mixing ratio of (50/50) virgin/reclaimed materials, the optimum recycling agent contents were (0.56%, 1%, 1.3%, and 1.5%) by weight of mixture for (used oil, oil + crumb rubber, soft grade asphalt cement, and asphalt cement + Sulfur) recycling agent respectively. Recycled Mixtures with reclaimed materials content, up to 70 %, and soft asphalt recycling agent, showed good performance. The percentages of variation for mixtures properties compared to mixtures with 50 % reclaimed materials were +3.6 %, +4.8 % for double punch shear, and compressive strength respectively, and the reduction in mixtures properties as compared to virgin mixture was in acceptable extent.