Surender Singh

Bio: Surender Singh is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topic(s): Silica fume & Portland cement. The author has an hindex of 15, co-authored 31 publication(s) receiving 523 citation(s). Previous affiliations of Surender Singh include Amity University & Indian Institute of Technology Roorkee.

Utilization of reclaimed asphalt pavement aggregates containing waste from sugarcane mill for production of concrete mixes.

Abstract: The present study investigates the potential of waste originating from road sector (RAP) and agricultural industry (Sugarcane Bagasse Ash) for production of concrete mixes. 5 mixes were prepared by partial replacing natural aggregates by coarse RAP (CRAP) and fine RAP (FRAP) in the proportions of 50% and 100%. 3 subsequent mixes were prepared by incorporating 100% RAP aggregates blended with 10% and 15% Bagasse Ash (BGA) as part replacement of cement. It was noted that incorporations of FRAP aggregates decreased the fresh, mechanical and durability properties of concrete significantly compared to CRAP aggregates. Incorporation of 10% BGA was found to enhance the mechanical and durability properties of 100% RAP concrete significantly. Economic analysis of the considered mixes showed that incorporations of RAP aggregates blended with BGA can reduce the total cost of 1 m3 concrete by more than 40% as compared to conventional concrete. From the present study, it is recommended to replace 10% of cement by BGA in RAP concrete as this would not only strengthen the pavement but provides with environmental and economic benefits.

An economical processing technique to improve RAP inclusive concrete properties

Abstract: The presence of asphalt film around Reclaimed Asphalt Pavement (RAP) aggregates has been reported as the main factor lowering the properties of RAP inclusive concrete A novel Abrasion and Attrition (AB&AT) technique to improve the quality of RAP by removing the contaminant layers of dust and punching the asphalt film adhering to RAP aggregates is introduced in this paper The effect of incorporating Dirty RAP (DRAP), Washed RAP (WRAP) and AB&AT treated RAP, on the fresh, mechanical and durability properties of concrete are also investigated and compared with each other The mechanical properties of RAP aggregates were found to be increased significantly on processing with AB&AT method Beneficiation of RAP by AB&AT method increased the compressive strength of concrete by 974% &1271%, split tensile by 266% &1221% and flexural strength by 605% & 855% as compared to WRAP and DRAP inclusive concrete Incorporation of RAP into concrete mix improved workability & cohesiveness Durability properties of concrete such as water absorption, initial rate of water absorption, total permeable voids and coefficient of water absorption were observed to be reduced for RAP inclusive concrete

Effect of mineral admixtures on fresh, mechanical and durability properties of RAP inclusive concrete

Abstract: This study deals with improvement in the properties of ABTRAP (Beneficiated RAP aggregates by Abrasion & Attrition technique) inclusive concrete by incorporating mineral admixtures such as Silica Fume (SF), Fly ash (FA) and Sugarcane Bagasse Ash (SCBA). 6 mixes were prepared by partially replacing Ordinary Portland Cement (OPC) by SF (5% &10%), FA (10% & 20%) and SCBA (5% & 10%). Maximum improvement in compressive, flexural and split tensile strength of ABTRAPC mix was found when 10% OPC was part replaced by SF followed by 20% replacement by FA and 5% replacement by SCBA. Even SF20 mix showed comparable strength to that of natural aggregate concrete (NAC) mix. Reductions in permeable voids, water absorption, initial rate and coefficient of water absorption and improved abrasion resistance was observed for all the considered mixes. A power regression equation (flexural strength = 0.368 × (compressive strength) 0.72 ) of high co-relation (R 2 = 0.93) was established to predict flexural strength from compressive strength results of ABTRAPC mixes. Based on the finding of the present part of investigation, it is recommended to replace 10% OPC by SF, FA (20% in sulphate free environment) and 5% by SCBA in ABTRAP inclusive concrete mixes.

Feasibility study of RAP aggregates in cement concrete pavements

Abstract: The presence of dust, asphalt film and agglomerated particles is considered to be the primary reason for reducing the properties of Reclaimed Asphalt Pavement (RAP)-inclusive concrete. A surface treatment method Abrasion and Attrition (AB&AT) was employed for removing these contaminants. Gaps were identified from the available literatures and efforts have been made to bridge them in order to increase the usage of RAP aggregates in concrete pavements. Six mixes were prepared by partly replacing the Natural Aggregates (NA) with RAP aggregates in different proportions. It was learnt that processing Dirty RAP (DRAP) aggregates by the AB&AT method could remove contaminants considerably as a result of which stronger bonding is exhibited at the interface of the aggregate and hydrated mortar matrix. Incorporation of beneficiated RAP aggregates in concrete improved the workability considerably but it was found to have reduced hardened concrete properties. However, the results were found to lie within the permissib...

Utilization of industrial and agricultural wastes for productions of sustainable roller compacted concrete pavement mixes containing reclaimed asphalt pavement aggregates

Abstract: Asphalt pavement recycling has become a common practice across the globe and has been successfully employed in construction of new pavements. While several studies considered utilization of reclaimed asphalt pavement (RAP) aggregates for flexible and rigid pavements, very few attempted its possibility for roller compacted concrete pavements (RCCP). Additionally, studies on the possibility of enhancing the proportion of RAP for RCCP are very scanty. The present study is an attempt to increase the potential of RCCP mixes containing 50% RAP (dust contaminated & stiffened asphalt coated: 50RAP via including various industrial and agricultural wastes such as Silica Fume, Fly ash, and Sugarcane ash as partial replacement of conventional cement. It was observed that the inclusion of the stated admixtures had an insignificant effect on the density of the fresh RCCP mixes, however, increased the moisture demand considerably. In fact, the results firmly indicated the potential of silica fume for RAP-RCCP blends, as, it not only enhanced the physical and mechanical properties, but found to improve the durability of RCCP mixes considerably. Also, utilization of silica fume was found to be economical & environmentally friendly amongst all wastes: with reduced initial construction cost & CO2 emissions by up to 8.4% & 9.7%. As far as the other industrial wastes are concerned, 15% fly ash could also be utilized for producing sustainable RCCP mixes, whereas, higher dosage of fly ash (30%) and sugarcane ash (10 & 15%) may be employed as base layer material of conventional concrete pavements.

American Society for Testing and Materials

Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

Properties Of Concrete

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Influence of Six Rejuvenators on the Performance Properties of Reclaimed Asphalt Pavement (RAP) Binder and 100% Recycled Asphalt Mixtures

Abstract: 100% recycled hot mix asphalt lab samples were modified with five generic and one proprietary rejuvenators at 12% dose and tested for binder and mixture properties. Waste Vegetable Oil, Waste Vegetable Grease, Organic Oil, Distilled Tall Oil, and Aromatic Extract reduced the Superpave performance grade (PG) from 94–12 of extracted binder to PG 64-22 while waste engine oil required higher dose. All products ensured excellent rutting resistance while providing longer fatigue life when compared to virgin mixtures and most lowered critical cracking temperature. Rejuvenated samples required more compaction energy compared to virgin and some oils reduced moisture resistance slightly.

Sustainability assessment for portland cement concrete pavement containing reclaimed asphalt pavement aggregates

Abstract: The lack of quantitative sustainability assessments of use of reclaimed asphalt pavement (RAP) in portland cement concrete (PCC) as an aggregate replacement for pavement applications has impeded the field application of pavements built with PCC containing RAP (RAP-PCC). This paper presents a life cycle inventory analysis in order to fill the gap of research and encourage a wider use of PCC made with RAP aggregates as paving materials. Three different types of pavements, namely a single-lift pavement made of plain PCC slab, a single-lift pavement made of RAP-PCC slab, and a two-lift concrete pavement using RAP-PCC as the bottom lift material, were designed, followed by an extensive sustainability assessment via the economic input-out life cycle assessment (EIO-LCA) approach. Based on the EIO-LCA results, the economic, social, and environmental benefits of utilization of RAP-PCC for pavement applications were clearly demonstrated. Among all three studied pavements in this case study, the single-lift RAP-PCC pavement could yield the highest economic benefits, while the two-lift construction using RAP-PCC in the bottom lift could have the highest positive impacts from social and environmental perspective.

Economic input-output life cycle assessment of concrete pavement containing recycled concrete aggregate

Abstract: Concrete pavement recycling has become a common practice for many states in the U.S. While material properties and structural performance of pavements with virgin concrete aggregates replaced by recycled concrete aggregate (RCA) have been extensively characterized, very little effort has been made to assess potential sustainability benefits of this application. A life cycle assessment to compare an RCA based portland cement concrete (RCA-PCC) pavement and a plain PCC pavement (i.e., without RCA) from all three aspects of sustainability (i.e., economic impact, social impact, and environmental impact) was carried out using an economic input-output life cycle assessment (EIO-LCA) approach. An inventory of stressors during materials production and construction, use, and end-of-life phases of pavement life cycle was obtained, followed by a life cycle impact analysis using the Tool for Reduction and Assessment of Chemicals and other Environmental Impacts (TRACI). Based on the results, the benefits of using RCA during the materials production and construction phase are invariably achieved for all the sustainability categories, but the RCA-PCC pavement would pose higher negative impacts during the use phase of pavement life. Still, the pavement made with RCA-PCC was found to be generally more environmentally and socially friendly compared to the pavement made with virgin aggregates, especially for the TRACI categories of ecotoxicity, human health cancer, and human health non-cancer. The sustainability benefits of using RCA for concrete pavement application will only be magnified with a growing level of environmental awareness, further diminishment of local virgin aggregate sources, and a rapid increase of landfill tipping costs for construction demolition debris in the future.