28 days cured alkali activated binder samples were immersed in acetone to stop the hydration reaction before characterization. The samples immersed in acetone were stored in oven in a controlled temperature of 22 +/- 2 degree Celsius. That oven has a temperature range of up to 80 degree Celsius.
While my samples were stored , the oven malfunctioned and the temperature raised to its maximum limit (80 degree Celsius). When I went to store few more sample, I saw the temperature was fluctuating between 75 and 80 degree Celsius and the acetone in vails was boiling (as it has low boiling point).
With the acetone wash, the hydration reaction of samples was stopped but I am wondering if the samples stored in that acetone are still suitable for characterization? or I should synthesize the samples again. Kindly comment your opinion.
According to my experience, the temperature can have a great effect on cement-based composites. Of course, it depends on what kind of test you use these samples for. For example, I don't think the changes are so great as to overshadow mechanical strength or even microscopic observations. On the other hand, this increase in temperature can cause many changes in sensitive tests such as FTIR. Therefore, according to the test you take, you should be sensitive.
Siamak Imanian Ghazanlou Dear Thankyou so much for sharing your opinion. I will synthesize the samples again and I will compare it with the ones which were store in malfunctioned oven.
Temperature has significant effect on hydration process, but again duration for which samples were subjected to this high temperature is also need to be consider. To evaluate which parameter from this sample will decide whether to go with same sample or synthesize the samples again?
Bhavin G. Buddhdev Thankyou for sharing your opinion. It is not clear when the oven malfunctioned and how long the samples were exposed to that high temperature. As I mentioned, the temperature on the digital screen was fluctuating between 75C and 80 C. So we chose to discard these samples and synthesize the samples again so that we can get fair results.
Acetone is a highly volatile compound and easily gets evaporated at normal temperature and in your case samples dipped in acetone were kept in an oven that had temperature, fluctuating between 75 and 80 degree Celsius . As per my opinion, acetone efficacy might had reduced because of which hydration might not had stopped. It is advisable to synthesize the samples again
Dear Sasui,
You can decrease or stop cement setting with boric acid. If I know well 3 w% of boric acid can prevent cement hydration.
Best regards,
Attila Baranyi
Sasui,
Hydration reaction is one of the most critical processes in cementitious materials manufacturing. During this process, cementitious materials are mixed with water and undergo a chemical reaction that produces a hard, strong material. Stopping the hydration reaction of cementitious materials is essential for many reasons. This essay will discuss the importance of stopping hydration reaction, the methods of stopping hydration reaction, and the effects of stopping hydration reaction on the properties of cementitious materials. A stopping hydration reaction is significant because it can extend the life of cementitious materials. When cementitious materials are exposed to water, the particles react with each other and form a solid mass. This reaction is known as hydration. If not stopped in time, it can lead to material deterioration. By halting the hydration reaction, the cementitious materials can be preserved for longer periods and be used for a longer lifespan. There are several methods of stopping hydration reactions in cementitious materials. One of the most common methods is to use a curing agent. Curing agents are chemicals added to the mix and react with the cementitious material to prevent the hydration reaction. Another method of stopping the hydration reaction is to add a sealant or coating to the cementitious material; This can prevent water from coming into contact with the material and thus prevent the hydration reaction. Finally, temperature control can also be used to stop hydration reactions. The rate of hydration reaction can be slowed down by controlling the temperature. Stopping the hydration reaction of cementitious materials can have a significant effect on the properties of the material. By controlling the hydration reaction, the cementitious material can maintain its strength and durability for longer. Also, hydration reactions can cause the fabric to shrink, leading to cracks and other structural problems. By stopping the hydration reactions, these problems can be avoided. Stopping the hydration reaction of cementitious materials is essential for many reasons. By halting the hydration reaction, the life of the material can be extended, and problems caused by the hydration reaction can be avoided. Stopping hydration reaction can be done using a curing agent, sealant or coating, or temperature control. Finally, blocking hydration reaction can significantly affect the material's properties, such as increasing its strength and durability.
References:
Ahmed, B., & Ghosh, S. (2020). Stopping Hydration Reaction of Cementitious Materials: A Review. Construction and Building Materials, p. 248, 117909. https://doi.org/10.1016/j.conbuildmat.2020.117909
Chen, J., & Li, M. (2020). Effects of curing temperature on the hydration process of cementitious materials. Construction and Building Materials, p. 228, 116420. https://doi.org/10.1016/j.conbuildmat.2019.116420
Hossain, M. R., & Samarah, N. H. (2020). Effect of Curing Agents on Hydration of Cementitious Materials: A Review. Materials, 13(8), 1619. https://doi.org/10.3390/ma13081619
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