An Investigation of the Effect of Nano-silica on Freeze, Thaw and Durability of Polymer Concrete in Chlorate Environment

Fathi, Amir and Eimani Kalehsar, Houshyar and Mohammadi, Yaghoub and Shahbazi, Naseraddin (2018) An Investigation of the Effect of Nano-silica on Freeze, Thaw and Durability of Polymer Concrete in Chlorate Environment. Masters thesis, University of Mohaghegh Ardabili.

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Text (بررسی تاثیر نانو سیلیس بر ذوب و انجماد و دوام بتن پلیمری در محیط کلراته) Amir Fathi.pdf Download (479kB) | Preview

Abstract

Compressive strength is one of the most important properties of concrete, but today, it has been discovered that paying attention to compressive strength as a design criteria for concrete structures in destructive environments can not address the problems that occur in concrete structures over time. freeze and thaw cycles are one of the main reasons for the destruction of concrete in cold regions. In these cycles the water inside the aggregates is frozen which causes tensile stress in concrete, which in turn causes cracking and reduction of compressive strength. Polymer cement concretes can be used in structures that are in destructive environments due to their cheaper price compared to other polymer concretes and their similarity to ordinary concrete in the construction and curing. In this study, the effect of nano-silica ( 0%, 0.5% and 1% of the weight of used cement ) on freeze and thaw of polymer cement concrete (Latex Sure Add 466 acrylic base) with 5%, 10% and 15% relative to cement weight Was evaluated. 10 concrete mix designs were considered in four environments (suitable environment, chlorite environment, freeze and thaw in normal environment and freeze and thaw in chlorite environment). The results showed, addition of 5%, 10% and 15% of polymers to concrete, reduces the compressive strength by 30%, 36% and 45%, respectively, but the ordinary concrete has lower durability in destructive environments, so that ordinary concrete lost 37% and 33% of its compressive strength after experiencing 150 cycles of Freeze and thaw in normal and chlorite environments, respectively. while polymer cement concretes have lower strength loss in the destructive environments.

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