Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/3833
Title: Bond strength of steel bars embedded in concrete containing recycled fine and coarse aggregates
Authors: Mahay, Amandeep
Supervisor: Kaur, Gurbir
Keywords: Bond strength;recycled aggregates;CED
Issue Date: 29-Oct-2015
Abstract: In the growing environmental concerns, the proper disposal of construction and demolition waste is a challenge for construction industry. The experimental studies are done on the demolition waste to use it in some productive way .The proper selection and processing of demolition waste can be helpful in producing concrete. Hence the use of demolition waste as a resource for recycling or recovery is gaining grounds in many countries. As In last two decades coarse recycled concrete aggregate (RCA), manufactured by processing of construction and demolition waste has received considerable attention as a potential substitute for natural coarse aggregate (NCA). However, structural application of RCA concrete has been slow primarily because of apprehensions that concrete containing RCA might be inferior to concrete made with NCA. The present work focuses on the effect of RCA on the compressive strength and bond strength between the concrete and the reinforcement. Six MIX combinations are prepared by replacing natural fine aggregate and natural coarse aggregate by recycled fine and recycled coarse aggregate to study compressive strength and bond strength at 7 , 28 and 56 day testing. The mix combinations incorporating recycled aggregate were prepared by replacing 0%, 50% and 100% of natural coarse aggregate and 0%, 50% for natural fine aggregate by weight to form 6 mix combinations - MIX 1 ( 100% NCA + 100% NFA ), MIX 2 ( 100% NCA + 50% RFA + 50% NFA ) , MIX 3 (50% NCA + 50% RCA + 100% NFA ), MIX 4 ( 50% NCA + 50% RCA +50% NFA+50% RFA) MIX 5 (100% RCA + 100% NFA ), MIX 6 (100% RCA + 50 %RFA + 50% NFA ). The compressive strength and bond strength both were studied at 7days, 28days and 56 days .For studying bond strength , pull out tests were carried out as per IS:2770 (Part I), 1967 and IS:432 (Part I), 1966 using16 mm diameter of rebar. In all the MIXES there is a pattern observed, which can be arranged as MIX 2 > MIX 1 > MIX 4 >MIX 3 > MIX 6 > MIX 5 (descending order) at 7day, 28day And 56 Day testing. iii MIX 2 (100% NCA + 50% RFA + 50% NFA) has shown the maximum bond strength whereas MIX 5 (100% RCA + 100% NFA) has shown minimum bond strength including control mix (MIX 1) i.e. 100% NCA and 100% NFA. For studying the compressive strength the compressive strength testing machine of capacity 5000 KN is used for determining the maximum compressive loads carried by concrete cubes. In all the MIXES there is a pattern observed, which can be arranged as MIX 2 > MIX 1 > MIX 4 >MIX 3 > MIX 6 > MIX 5 (descending order) at 7day, 28day And 56 Day testing. MIX 2 (100% NCA + 50% RFA + 50% NFA) has shown the maximum compressive strength whereas MIX 5 (100% RCA + 100% NFA) has shown minimum compressive strength including control mix (MIX 1) i.e. 100% NCA and 100% NFA. This thesis, aims to find the possibility of the structural usage of recycled aggregate concrete as alternative or mixed with natural aggregates, by conducting a comprehensive laboratory investigation for better understanding of compressive strength and bond strength properties of recycled aggregate concrete.
Description: ME, CED
URI: http://hdl.handle.net/10266/3833
Appears in Collections:Masters Theses@CED

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