guitarace372

Ah, thanks for the input and link. I was looking for info on varying qualities of fly ash and affect on strength. Thanks again.

Hello. I recently did an experiment for a science fair in which I tested the effects of fly ash in concrete on the strength of the concrete. I tested 0%, 25%, and 50% amounts of fly ash in the concrete. All of the research I've collected says that fly ash increases the strength of concrete. However, my results displayed the opposite. My control group of just Portland cement and no fly ash was the strongest and the 50% concentration of fly ash was the weakest. Each test group underwent hydration for a time of 3 days. Any ideas of why this happened? Thanks!

This will probably be the ferrofluid I will use: http://www.teachersource.com/ElectricityAndMagnetism/Ferrofluid/BulkFerrofluid.aspx I think I might like the experiment dealing with the surface tension more but I would like some feedback here. If you can answer anything please do. Thanks.

Hello all, I'm a sophomore in highschool and I am planning an experiment with ferrofluids for a science fair next year. In my experiment, I would like to test whether the heat of a ferrofluid affects the size and number of spikes of ferrofluid that is magnetized. I want to put ferrofluids of different temperatures in different tubes. I would then place a magnet beneath the tubes and measure the number of spikes and record their heights. I have some questions though: 1.) What should the tubes be made out of? I would like a medium that is clear and does not block the magnetic field much. 2.) What kind of magnet should I use? I am thinking neodymium perhaps. 3.) Will heating or cooling the ferrofluids hinder their ability to become magnetized in multiple trials? 4.) What exactly does the height or number of spikes display? For example, the strength of the magnetic field. I was also considering doing a different ferrofluid-related experiment: Testing the temperature of the medium on the effect of surface temperature. From research I can tell that more spikes means less surface tension. Or, there is always the possibility of testing the temperature of the magnet. Thanks in advance! If you can't answer all the questions that is alright. Also tell me if you like the experiment of testing for the surface tension more. Thanks again.