Synthesis of Fly-ash and Slag Based Geopolymer Concrete for Rigid Pavement, performance evaluation of calcined and uncalcined cashew nut-shell ash (UCCNA and CCNA) with treated total recycled concrete aggregate (TRCA) in self-compacting concrete, Utilization of cashew nut-shell ash as a cementitious material for the development of reclaimed asphalt pavement incorporated self- compacting concrete

Document Type

News Article

Abstract

  1. Synthesis of Fly-ash and Slag Based Geopolymer Concrete for Rigid Pavement

This research work describes the synthesis of fly-ash and granulated blast furnace slag (GGBS) based Geopolymer concrete (FSGC) for paving applications. The study looked at a total of 12 combinations comprising GGBS in proportions of 25%, 50%, 75%, and 100% as a fly-ash substitute, sodium hydroxide (NaOH) solutions of 8, 10, and 12 molars(M), and a fixed sodium hydroxide solution to sodium silicate (S/S) ratio of 2.5. The specimens were all cured outside in the open air.

  1. performance evaluation of calcined and uncalcined cashew nut-shell ash (UCCNA and CCNA) with treated total recycled concrete aggregate (TRCA) in self-compacting concrete

This study concentrates on the performance evaluation of calcined and uncalcined cashew nut-shell ash (UCCNA and CCNA) with treated total recycled concrete aggregate (TRCA) in self-compacting concrete. The achievement of sustainable self-compacting concrete (SCC) is possible by the implication of four stages, which includes TRCA treatment process, gradation selection process through Bailey aggregate grading technique, by considering TRCA replacement percentage with an increment of 25% and up to 100% and by considering UCCNA or CCNA replacement with an increment of 5% and up to 20%. Hardened and fresh properties of SCC have been performed and analyzed based on the compliance requirements of SCC. In addition finding results through microstructure assessment was in line with the findings of the hardened and

fresh properties of SCC. In addition, quality and dynamic instability assessments of SCC were analyzed through ultrasonic pulse velocity and drying shrinkage aspects

  1. Utilization of cashew nut-shell ash as a cementitious material for the development of reclaimed asphalt pavement incorporated self compacting concrete

This study focuses on developing sustainable self-compacting concrete (SCC) through the optimization process by incorporating Reclaimed Asphalt Pavement (RAP) as coarse and fine aggregates and also utilizing Cashew Nut-shell Ash (CNA) as a cementitious material. To achieve this optimization technique is implemented in four stages, which are the RAP aggregate treatment process, gradation selection process, RAP replacement percentage, and considering the CNA replacement percentage. RAP has been treated by a novel freeze–thaw cyclic procedure followed by the abrasion treatment method. Bailey’s Aggregate Grading Technique (BAGT) has been implemented to line up the aggregate packing gradation. Mechanical and rheological properties have been conducted and analyzed based on compliance requirements of SCC at ambient temperature. Paste properties are analyzed through Field Emission Scanning Electron Microscopy, X-ray diffraction, Energy-Dispersive- Spectroscopy, and Thermo Gravimetric Analysis. Further, quality assessment of SCC has been performed through X-ray μCT (Xradia, XCT-500) and Ultrasonic Pulse velocity tests

  1. https://link.springer.com/article/10.1007/s41062-022-00907-8
  2. https://www.sciencedirect.com/science/article/abs/pii/S0950061821019577?via%3Dihub
  3. https://www.sciencedirect.com/science/article/pii/S2214785321073429?via%3Dihub
  4. https://www.sciencedirect.com/science/article/pii/S2214785322005090?via%3Dihub
  5. https://www.sciencedirect.com/science/article/pii/S2214785322029753?via%3Dihub
  6. https://www.emerald.com/insight/content/doi/10.1108/JEDT-02-2021-0095/full/html

Publication Date

Spring 10-1-2022

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