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

Ali Saberi Varzaneh, Mahmoud Naderi

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

Keywords


flexural strength; compressive strength; tensile strength; processing; "Friction-Transfer"; "Pull-off"; repair mortar

Full Text:

PDF

References


ASTM C42/C42M-18a. Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete (2018). ASTM International. doi: http://doi.org/10.1520/C0042_C0042M-18A

Masi, A., Digrisolo, A., Santarsiero, G. (2013). Experimental Evaluation of Drilling Damage on the Strength of Cores Extracted from RC Buildings. World Academy of Science, Engineering and Technology International Journal of Structural and Construction Engineering, 7 (7), 525–531.

ASTM C900-15. Standard Test Method for Pullout Strength of Hardened Concrete (2015). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0900-15

ASTM C597-16. Standard Test Method for Pulse Velocity through Concrete (2016). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0597-16

ASTM C808/C805M-18. Standard Test Method for Rebound Number of Hardened Concrete (2018). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0805_C0805M-18

Naderi, M. (2005). Friction-transfer test for the assessment of in situ strength and adhesion of cementitious materials. Construction and Building Materials, 19 (6), 454–459. doi: https://doi.org/10.1016/j.conbuildmat.2004.07.018

ASTM C1583-04. Standard test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair and overlay materials by direct tension (Pull-off method) (2004). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C1583-04

Naderi, M. (2011). Non-Destructive Evaluation of Engineering Properties of Intact Rock Using the Friction-Transfer Method. Arabian Journal for Science and Engineering, 36 (2), 215–226. doi: https://doi.org/10.1007/s13369-010-0021-9

Eskandari-Naddaf, H., Kazemi, R. (2018). Experimental evaluation of the effect of mix design ratios on compressive strength of cement mortars containing cement strength class 42.5 and 52.5 MPa. Procedia Manufacturing, 22, 392–398. doi: https://doi.org/10.1016/j.promfg.2018.03.060

Still, G. T. (2004). Strength of cementitious mortars: a literature review with special reference to weak mortars in tension. United Kingdom, University of Warwick, Coventry, CV4 7AL.

Kim, Y.-Y., Lee, K.-M., Bang, J.-W., Kwon, S.-J. (2014). Effect of W/C Ratio on Durability and Porosity in Cement Mortar with Constant Cement Amount. Advances in Materials Science and Engineering, 2014, 1–11. doi: https://doi.org/10.1155/2014/273460

Mannan, M. A., Basri, H. B., Zain, M. F. M., Islam, M. N. (2002). Effect of curing conditions on the properties of OPS-concrete. Building and Environment, 37 (11), 1167–1171. doi: https://doi.org/10.1016/s0360-1323(01)00078-6

Neville, A. M. (1992). Properties of concrete. USA: Longman Scientific and Technical.

ASTM C136-01. Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates (2001). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0136-01

ASTM C127-15. Standard test method for relative density (specific gravity) and absorption of coarse aggregate (2015). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0127-15

ASTM C127-12. Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate. ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0127-12

ASTM C348-19. Standard test method for Flexural Strength of Hydraulic-Cement Mortars (2019). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0348-19

ASTM C190. Method of Test for Tensile Strength of Hydraulic Cement Mortars (Withdrawn 1990) (1985). American Society for Testing and Materials.

ASTM C109/C109M-13. Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens) (2013). ASTM International, West Conshohocken, PA. doi: http://doi.org/10.1520/C0109_C0109M-13

Han, V., Ros, S., Shima, H. (2013). Effects of Sand Content, Superplasticizer Dosage, and Mixing Time on Compressive Strength of Mortar. ACI Materials Journal, 110 (1). doi: https://doi.org/10.14359/51684363

Çakır, Ö., Aköz, F. (2008). Effect of curing conditions on the mortars with and without GGBFS. Construction and Building Materials, 22 (3), 308–314. doi: https://doi.org/10.1016/j.conbuildmat.2006.08.013

Neville, A. M., Brooks, J. J. (2015). Concrete technology. Pearson Education Canada, 464.




DOI: http://dx.doi.org/10.21303/2461-4262.2020.001190

Refbacks

  • There are currently no refbacks.


Bookmark and Share


Copyright (c) 2020 Ali Saberi Varzaneh, Mahmoud Naderi

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

ISSN 2461-4262 (Online), ISSN 2461-4254 (Print)