COI code: CEMENT05_044
Paper Language: English
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Authors Effect of Nano- and Micro silica on compressive and bond strength in saline environments: An experimental and microstructural studyH Divanedari - MSc student, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Khorasan Razavi, Iran
H Eskandari-Naddaf - Associate Professor, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Khorasan Razavi, Iran
Abstract:Simultaneous using of nanosilica (NS) and microsilica (MS) can improve the chemical and microstructural reactions of concrete. Hence, this improvement can increase the bearing capacity of reinforced concrete structures by increasing the compressive strength of concrete and the bond strength between rebar and concrete, especially in saline environments. Therefore, in this study, 14 mixes including different percentages of NS and MS based on two types of cement strength class have been designed to evaluate the compressive and bond strength in salt solution with two concentrations of 15% for cement 42.5 MPa (C42.5) and the concentration of 20% for cement 52.5 MPa (C52.5) cement. Scanning electron microscope (SEM) was also used to study the microstructural part of the rebar-to-concrete bonding surface. Experimental results showed that replacement of cement with 7% MS + 3% NS, increased compressive strength by 90% and the bond strength by 66% for C42.5. Also for C52.5, 5% MS + 5% NS improved 88% compressive strength and 59% bond strength. In addition to dependency of optimum mix design to cement type, it is seen that the increasing of CSC can control the degradation caused by increasing salt concentration.
Keywords:Nanosilica, Microsilica, Compressive strength, Bond strength, Microstructure.
COI code: CEMENT05_044
how to cite to this paper:If you want to refer to this article in your research, you can easily use the following in the resources and references section:
Divanedari, H & H Eskandari-Naddaf, 2019, Effect of Nano- and Micro silica on compressive and bond strength in saline environments: An experimental and microstructural study, Fifth National Conference on Cement Industry and the Future Horizon, تهران - مركز همايش هاي بين المللي رازي, دانشگاه حكيم سبزواري, https://www.civilica.com/Paper-CEMENT05-CEMENT05_044.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Divanedari, H & H Eskandari-Naddaf, 2019)
Second and more: (Divanedari & Eskandari-Naddaf, 2019)
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The University/Research Center Information:
Type: state university
Paper No.: 3339
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