Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland Pozzolane Cement (PPC) mixes and different diameter of TMT bars by using pullout test

doi:10.1007/s11709-013-0193-y

Front Struc Civil Eng

2013, Vol. 7

Issue (1) : 39-45 https://doi.org/10.1007/s11709-013-0193-y

RESEARCH ARTICLE

Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland Pozzolane Cement (PPC) mixes and different diameter of TMT bars by using pullout test

A D POFALE, S P WANJARI(

)

Department of Civil Engineering, Visvesvarya National Institute of Technology, Nagpur 440010, India

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Abstract

Since last two decades, the Portland Pozzolane Cement (PPC) is extensively used in structural concrete. But, till to date, a few literature is available on bond strength of concrete using PPC mixes. There are many literatures available on bond strength of concrete mixes using Ordinary Portland Cement (OPC). Hence, a comparative study was conducted on bond strength between OPC and PPC mixes. In the present investigation, total 24 samples consisting of M20, M35 and M50 grades of concrete and 16 and 25 mm diameter of TMT bar were tested for 7 and 28 days. The pullout bond test was conducted on each specimen as per IS: 2770-1967/1997 [1] and the results were observed at 0.25 mm slip at loaded end called as critical bond stress and at maximum bond load called as maximum bond stress. It was observed that the critical bond strength of PPC mixes is 10% higher than OPC mixes. Whereas, marginal improvement was noticed in maximum bond strength of PPC mixes. Hence, based on these findings, it could be concluded that development length for PPC mixes could be reduced by 10% as compared with same grade of OPC mixes.

Keywords bond strength Portland Pozzolane Cement (PPC) concrete Ordinary Portland Cement (OPC) concrete bond between concrete and steel pullout test development length

Corresponding Author(s): WANJARI S P,Email:swapnil_wanjari@yahoo.co.in

Issue Date: 05 March 2013

Cite this article:

A D POFALE,S P WANJARI. Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland Pozzolane Cement (PPC) mixes and different diameter of TMT bars by using pullout test[J]. Front Struc Civil Eng, 2013, 7(1): 39-45.

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https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0193-y
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I1/39

Tab.1 Physical properties of OPC and PPC as per IS 12269-1987 []

Tab.2 Chemical properties of reinforcement steel as per IS 1786-2008 [] (part-1)

Tab.3 Physical properties of aggregates

Tab.4 Design mixes

Fig.1 Combined grading curve

Fig.2 Test setup of pullout bond test

Fig.3 Pullout testing under progress

Fig.4 Crushing of concrete due to pullout by lugs after pullout test

Tab.5 Test result of pullout bond test specimens

Fig.5 Relation between critical bond stress and grade of concrete for 16 mm diameter TMT bar

Fig.6 Relation between critical bond stress and grade of concrete for 25 mm diameter TMT bar

Fig.7 Relation between maximum bond stress and grade of concrete for 16 mm diameter TMT bar

Fig.8 Relation between maximum bond stress and grade of concrete for 25 mm diameter TMT bar

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