Influence of Reclaimed Asphalt Pavement Aggregates on Strength and Durability Properties of Concrete Mixes in Rigid Pavements (original) (raw)
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BEHAVIOUR OF PAVEMENT QUALITY CONCRETE WITH RECLAIMED ASPHALT PAVEMENT AGGREGATES
Concrete is the basic material in all construction works and coarse aggregates constitute more than 50% of the mix. But the procurement and generation of natural aggregates is getting difficult day by day because of lack of natural source and environmental effects. In search of alternative for natural aggregates, lead to the usage of Reclaimed Asphalt Pavement aggregates, which are produced abundantly due to replacement of Flexible Pavements with Rigid Pavements in India. This study is taken up to determine the variation of different properties of strength and mainly durability of concrete pavements with natural aggregates and RAP aggregates. The cubes will be casted and tested for Strength and Flexural Strength is also determined by casting beams. The results can be analyzed to identify the importance of RAP aggregates for its effective and efficient usage for present scenario of India. The RAP Aggregates are procured from NICE, Bangalore. And it is checked for the effective utilization in Concrete Pavements. RAP aggregates are replaced with Natural Aggregates by 100%, 75%, 50% and 25% and evaluated. Also the fatigue models are developed by testing the beams under repeated loadings by considering stress ratio of 65%, 75% and 85%.
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.
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.
International Journal of Pavement Research and Technology, 2018
This study proposes the use of industrial and agricultural wastes as mineral admixtures for enhancing the mechanical and durability aspects of concrete containing recycled concrete aggregates derived from concrete waste. The study was carried out by testing specimens prepared from concrete mixes with and without recycled concrete aggregates and three different mineral admixtures viz: fly ash (an industrial waste), rice husk ash and bagasse ash (agricultural wastes) for their compressive strength, flexural strength, split tensile strength, workability, chloride ion concentrations, carbonation, sorptivity and abrasion resistance in order to assess the variations and improvements. It was observed that concrete mix upon incorporating mineral admixtures showed significant improvement in both mechanical and durability properties when compared to concrete mix with recycled concrete aggregates alone. Fly ash admixed mixes showed a gain of 15% and 24% for compressive and flexural strength parameters, while the gain for rice husk ash mix and bagasse ash mixes was observed to be 12% and 25%, 13% and 20% respectively when compared to recycled aggregate concrete mix without mineral admixtures. Improvements in durability aspects were observed by incorporating mineral admixtures supported by lower parameters for water absorption, sorptivity coefficients and chloride ion concentrations and increased hydration products as concluded from scanning electron microscopic investigations.
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.
Utilization of Reclaimed Asphalt Pavement Materials in Rigid Pavement
International Journal of Engineering Research and
Concrete has proven to be a suitable and crucial material in construction and it also has been successfully implemented in numerous projects. Demand for concrete for construction is on the increase and at the same time, there is a shortage of natural aggregates in many areas. Today it has become really difficult to obtain natural aggregates for concrete locally. Bringing aggregate from faraway places increases the cost of concrete. Hence a real and urgent need to consider using satisfactory alternative aggregate materials. On the other hand, already a huge amount of industrial waste are generated around the world such as fly ash, blast furnace slag etc. Most of these industrial wastes are not effectively used, and a large part of reclaimed asphalt pavements (RAP) material are removed for reconstruction, resurfacing are disposed of in landfills. As the demand of power and amenities increases, the volume of these wastes would increase against this background, RAP concrete has begun to gain significant consideration from the research scholar and construction practitioners, because of its advantageous in using industrial by-product to replace cement and RAP aggregate replace natural aggregate.
Large quantities of agricultural waste are generated daily, and their safe disposal raised much global concern. The popular trends in the stabilization or modification of construction materials, especially soil, have resulted in innovative techniques of utilizing the solid waste materials. This paper presents an experimental investigation into the use of Rice Husk Ash (RHA) as filler to replace Ordinary Portland Cement (OPC) in Reclaimed Asphalt Pavement (RAP). Results of preliminary tests on RAP showed that its properties for pavement mix design were below the standard specification for road works. For correction, RAP was reconstituted with fresh aggregate. Rice Husk Ash (RHA) was used as partial replacement for Ordinary Portland Cement (OPC). Marshall stability tests were performed on various mixes to investigate the pavement performance indices of the blended materials. The most effective combination of mix constituents that meets all design requirements was 70% RAP, 27% fresh aggregate and 3% mineral filler. An optimum value of 25% RHA filler replacement for OPC was obtained. Indirect tensile strength test results indicated that the use of RHA as filler contributes more to crack resistance of recycled asphalt pavement than OPC filler.
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...
Sustainable Construction – Use of Blended Cements in High-Performance Concrete Pavements
This study aimed at evaluating the properties of high performance concrete pavements made from blended cements using agricultural wastes i.e. rice husk ash, Portland cement, natural aggregates and sand. Large quantities of agricultural wastes like rice husk are generated from rice processing units worldwide. Rice husk ash blended with Portland cement has proved to improve cement strength as well as durability however its use in high performance concrete pavements has not been investigated to-date. Keeping in view the typical problems of pavements mainly due to dynamic loading, larger exposed surfaces, use of deicing chemicals, effects of groundwater containing sulphates etc, wide ranging investigations covering most aspects of mechanical behavior, permeability and durability aspects including sulphate and chloride resistance and shrinkage were carried out for various mixes for compressive strengths of 60N/mm 2 and 80N/mm 2. Compressive strengths of concrete specimen with blended cements were observed to be higher by about 5 to 10% than the control specimen, higher values for concrete with 75% Portland cement blended with 25% rice husk ash whilst lower values correspond to concrete with 50% Portland cement blended with 50% rice husk ash. Similarly, higher flexural strength, improved moduli of elasticity, higher density, lower permeability, improved sulphate and chloride resistance and reduced shrinkage were observed. Better strengths and improved durability of such pavement concretes is likely to make it a more acceptable material for major road construction projects.
2015
Concrete pavements have high strength, durability, better serviceability and overall economy in the long run. The shove nowadays is to produce thinner and green pavement sections of better quality, which can carry the heavy loads. The present study was undertaken to investigate the effect of partial replacement of cement with fly ash and rice husk ash on compressive strength and flexural strength of concrete mix. Cement was partially replaced by fly ash at three different levels of replacement i.e. 10%, 20% and 30% and same with rice husk ash as well as with combined replacements of fly ash and rice husk ash. Tests were performed after 28 days of curing of concrete. Cubes and beams were prepared for determining compressive strength and flexural strength of concrete with different water-cement ratio as 0.30, 0.35 and 0.40 for min required flexural strengths 5.5 N/mm 5 N/mm 4.5N/mm respectively. Super-plasticizer was used in all the mixes at 1% level by weight of cementitious material...