• Sanjay Shukla
• Anant Kumar
• Toshan Singh Rathour

As the use of Recycled Concrete Aggregate (RCA) has increased, a sign of what we are doing is moving towards a more sustainable practice in the construction industry for most of the works to replace natural coarse aggregates. It is not only an option for virgin aggregate scarcity when using RCA but also eliminates concrete waste management due to significant levels of aggregates extracted from a few sources, leading to pressure applied on the natural environment. The research work deals with a comprehensive investigation of M35 grade concrete incorporating 60% RCA along with 40% natural-sized aggregate. Renovation rubble was obtained after demolished concrete cubes were crushed in order to make the result an RCA. Nano-silica was also added as a partial cement substitution at a level of 1.5 % by wt of Portland Pozzolana Cement (PPC), and M-Sand (known as manufactured sand /M-Sand) was considered as fine aggregate. The mechanical and durability performance of the concrete mixes were investigated through both laboratory experimental studies. Compression test, split tensile strength and flexural test were carried out. 60% RCA mix: % of CTR achieved comp. Strength gain of 16%, 21%, 75%, and 100% of the target strength at 3, 7, and 28 days, respectively. The durability of the concrete was tested and verified for water permeability and acid attack resistance. These findings suggest that concrete including RCA, nano-silica and M-Sand are high-performance durability materials matching or exceeding normal Portland cement concrete. This study supports the notion of widespread application of recycled materials within construction practices, bettering the sustainability and environmental stewardship of practices.

Recycled aggregate concrete, M-Sand, Nanosilica, SEM, compressive strength, split tensile strength, flexural strength, Acid exposure

"Comprehensive Study on the Mechanical and Durability Properties of M35 Concrete with Recycled Aggregates, Nano-Silica, and Manufactured Sand", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 6, page no.g192-g199, June-2025, Available :http://www.jetir.org/papers/JETIR2506625.pdf

"Comprehensive Study on the Mechanical and Durability Properties of M35 Concrete with Recycled Aggregates, Nano-Silica, and Manufactured Sand", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 6, page no. ppg192-g199, June-2025, Available at : http://www.jetir.org/papers/JETIR2506625.pdf