Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/5884
Title: PREDICTION OF MASONRY STRENGTH USING NONDESTRUCTIVE TECHNIQUES
Authors: Shahbakhsh, Moosa
Keywords: CIVIL ENGINEEING;MASONRY;STRENGTH;NONDESTRUCTIVE TECHNIQUES
Issue Date: 1989
Abstract: The basic advantage of masonry construction lies in the fact that it promotes use of indigeneous materials of construction and saves the scarced materials of construction namely cement and steel. It is labour intensive and, therefore, more suitable to country like India. Further a masonry wall performs a variety of functions in construction namely suppor-ting loads, sub-dividing space, providing thermal and acousti-cal insulation, affording fire and weather protection etc. and is thus economical to conventional R.C. construction. In spite of all these advantage and extensive use of masonry construction for the last so many years, the investigation of the properties of masonry construction by non-destructive techniques are not well established. Using conventional methods for prediction of properties of masonry sometimes become un-economical and laborious and moreover these cannot be used to predict the properties of insitu masonry. The non-destructive examination of masonry would also help in the distress manage-ment and rehabilitation of such structures. In the first part of the present study, the properties of the constituent materials namely one type of brick and the three grades ofmortars used were investigated. Further the compressive strength and the elastic properties (Young's Modulus and Poisson's ratio) of three types of masonry obtained by different brick mortar combinations have been determined by the destructive tests. The control specimens used for ( iv) investigation were pillar and wall panel type. To investigate the effect of plaster half of the specimens were plastered using grade (1:0:4.5). of mortar. In second part of the study, attempt has been made to predict the properties of masonry by nondestructive techniques namely the'Rebound hammer and the ultrasonic pulse velocity and the same control specimens as mentioned above were used for testing. It is obvious that the Reboundnumber and pulse velocity of masonry are effected by number of factors. In this study, experimental investigation have been conducted to study the effect of a few parameters like the stress level, plaster and the thickness of masonry. Lastly based upon the test results, correlation between the compressive strength and RebOund Number 'R' and Pulse Velocity 'V' have been established and best fit expression are proposed for different cases (unplastered and plastered Pillar and wall panel). The validation of the proposed corre-lation has been done by nondestructively testing the other masonry models and structures in the laboratory and comparing the predicted results with the reported test values. The results have shown that it is possible to predict masonry properties within a difference of ± 7 to 15Z of the actual value obtained experimentally.
URI: http://hdl.handle.net/123456789/5884
Other Identifiers: M.Tech
Research Supervisor/ Guide: Bhandari, N. M.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Civil Engg)

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