DETERMINATION OF MECHANICAL PROPERTIES OF REPAIR MORTARS USING IN SITU METHODS UNDER DIFFERENT CURINGS

Ali Saberi Varzaneh,Mahmoud Naderi

doi:10.21303/2461-4262.2020.001190

Ali Saberi Varzaneh, Mahmoud Naderi

Open Access

https://doi.org/10.21303/2461-4262.2020.001190

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Abstract

Considering the differences between environmental conditions of concrete structures and laboratory conditions, it is important to determine the parameters of the materials at the site of the structure. One of these materials is cement-based repair mortars due to the damage of concrete structures that may arise due to chemical or physical factors, these structures are required to be repaired. For this reason, in this paper, to determine the strength of repair mortars of different ages and under different Curing, Situ methods "Friction-Transfer" and "Pull-off" were used and the relationships between the Flexural Compressive, Tensile and readings obtained from the above methods on cementations mortars are presented. Experiments were performed on mortars at ages 3, 7, 28, 42 and 90 days under the conditions of "waterlogging", "Curing Agent" and "releasing in the outdoor". The results show the high impact of the process on the Flexural Compressive, Tensile of the repair mortars and the results of the "Friction-Transfer" and "Pull-off" methods. Also, a high correlation coefficient was obtained between the mechanical properties of the mortars and the results of the above tests; it is possible to measure the mechanical properties of repair mortars in situ with high confidence and in situ

Highlights

Since the laboratory methods of determining the mechanical properties of mortars mainly control the quality of the materials used in their preparation and do not provide a proper assessment of the process of obtaining mortar strength at the site, it is important to conduct tests to evaluate the strength of mortars
Due to the high correlation coefficient between the compressive strength of the repair mortar and the results of the above method, it is easy to determine the compressive strength of the mortar using the “Friction-Transfer” test
Due to the high correlation coefficient between the compressive strength of the repair mortar and the results of the above method, it is easy to determine the compressive strength of the mortar by using the “Pull-off” test

Summary

Introduction

Since the laboratory methods of determining the mechanical properties of mortars mainly control the quality of the materials used in their preparation and do not provide a proper assessment of the process of obtaining mortar strength at the site, it is important to conduct tests to evaluate the strength of mortars. The in situ methods of determining the mechanical properties of mortars are used in such cases as the process of obtaining strength, evaluating existing strength, and so on. Destructive methods include loading the fragment into the structure or the fragment itself, or core drilling part of the fragment and testing it in the laboratory under standard conditions [1]. These methods have disadvantages these include high cost, significant damage to the structure, limited repeatability and usually the closure of the operation of the structure during testing. The “pull out” method is another method [3] that falls into the category of destructive methods and causes damage to the concrete element

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Conclusion