Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Effect of variations in W/C ratio and using non-reactive fine or coarse aggregate in controlling the negative effects of ASR on the concrete bond strength

Document Type : Original Article

Authors
Maryam Abbasiyan Taeb 1
Freydoon Rezaie 2
Ebrahim Ghiasvand 3
1 Ph.D. Student, Department of Civil Engineering,, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
2 Associate Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
3 Assistance Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
10.22065/jsce.2024.450487.3380
Abstract
Alkali-silica reaction (ASR) is accompanied by expansion and cracking in the concrete, which weakens the mechanical properties, including bond strength of the concrete. This paper intends to quantitatively investigate the effect of fine and coarse reactive aggregate and variations in the water-cement (W/C) ratio on bonding strength of the ASR-damaged concrete. To this aim, a number of cubic specimens reinforced with 12 and 16 mm rebars and six concrete mixtures of different combinations of reactive/non-reactive fine and coarse aggregate and different W/C (0.45, 0.5, 0.55) were produced and immersed in NaOH solution. Then, pull-out tests (POTs) are conducted to evaluate the bond strength of the specimens. The results showed that the use of only non-reactive coarse aggregate in specimens with 12 and 16 mm diameter rebars increased the bond strength by 2.2 and 8.3 percent, respectively, and the use of only non-reactive fine aggregate increased by 8.3 and 18 percent, respectively, compared to R-0.5 sample. Therefore, the use of non-reactive fine aggregate is more effective than non-reactive coarse aggregate to improve the rebar anchorage in the ASR-damaged concrete. Also, in the specimens with 12 mm rebar, the loss in bond strength tended to intensify with the increase in W/C ratio. In contrast, in the specimens with 16 mm rebar, the amount of bond strength loss did not follow a constant trend according to the changes in W/C ratio. Finally, both solutions namely W/C reduction and reactive aggregate replacement were recommended as suitable strategies to control the negative effects of ASR on bonding behavior. However, with the furthering of the reaction and in the long term, the effect of the former alternative tends to diminish. In addition, it seems that the second option is a more suitable solution to improve bonding strength of thicker rebars in the long term.
Keywords
Alkali-silica reaction
concrete bond strength
pull-out test
fine and coarse aggregate
water-cement ratio

Subjects

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  • Receive Date 03 April 2024
  • Revise Date 08 July 2024
  • Accept Date 04 August 2024