Compressive Strength of Concrete with Construction and Demolition Waste and m-SAND using Additives
DivyaSrinath1, Shashishankar A2, Ravindra R3, Mohiyuddin C S4

1Divya Srinath, Associate Professor, Department of Civil Engineering, Nagarjuna College of Engineering and Technology, Bangalore (Karnataka), India.
2Shashishankar A, Professor, Department of Civil Engineering, AMC College of Engineering, Bangalore (Karnataka), India.
3Ravindra R, Associate Professor, Department of Civil Engineering, Rashtreeya Vidyalaya College of Engineering, Bangalore (Karnataka), India.
4Mohiyuddin C S, Assistant Professor, Department of Civil Engineering, AMC College of Engineering, Bangalore (Karnataka), India.
Manuscript received on 21 September 2019 | Revised Manuscript received on 06 October 2019 | Manuscript Published on 11 October 2019 | PP: 935-937 | Volume-8 Issue-2S10 September 2019 | Retrieval Number: B11560982S1019/2019©BEIESP | DOI: 10.35940/ijrte.B1156.0982S1019
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Abstract: Construction and Demolition wastes(C&D wastes) are generated in all cities of the world due to rapid urbanization. Disposing C & D waste these days is a costly affair, and raises environmental issues. Hence an attempt is made to reuse the demolished concrete as a partial replacement of natural coarse aggregates. Also due to ban of sand mining by local authorities, the cost of natural fine aggregate is very high and itself becoming a scarce material. Hence crushed stone aggregates called manufactured sand (m sand) is used, totally replacing natural fine aggregates. This concept is found to be cost effective, minimizes disposal of C & D wastes, and leads towards Green Building Concepts. Compression test on M40 concrete cubes of size 150mmx150mmx150mm are conducted at end of 7 days and 28days. Mix design for M40 concrete is made in accordance to IS: 10262-2019 with water cement ratio of 0.45 using 53 Grade Ordinary Portland cement. Superplasticizer (LIQUIFIX) is used to enhance workability. Nano Silica (NS)(1.5% by weight of cement),Wollastonite powder(WP)(10%by weight of cement) and Basalt fibres(BF)(1% by weight of cement) are added as additives. It is observed, that compressive strength of 7 days and 28 days cured samples is 25% more with the addition of all three additives compared to samples without additives. Hence the loss of compressive strength obtained by using demolished concrete as aggregates and m sand in concrete is regained with the addition of additives.
Keywords: Construction & Demolition Waste, Concrete, m Sand, Nano Silica, Basalt Fibres, Wollastonite Powder.
Scope of the Article: Concrete Structures