Can Water Make Voids in Concrete?
This video uses a technique called Fast X-ray Computed Tomography to watch void formation in concrete. This video shows that the dissolved air in the mixing water can form new voids in concrete. These voids seem to increase in volume over the first two hours and then start to decrease and stop changing size after 5 h of hydration. These voids may be responsible for changing the strength and durability of concrete and have not well documented in previous studies. This work shows that by using de-aired water then the voids will not form and there is a decrease in the volume of voids when fly ash or limestone is used in the mixtures. This work was completed by Masoud Moradian for his PhD work at Oklahoma State University. We had a huge team of people that helped. This includes Qinang Hu, Mohammed Aboustait, Bret Robertson, Jay Hanan, George Scherer, and Xianghui Xiao. A special thanks goes to Zhidong Zhang, the beamline scientist at Argonne. You can find more information about this work in the following journal papers: Masoud Moradian, Qinang Hu, Mohammed Aboustait, M. Tyler Ley, Jay C. Hanan, Xianghui Xiao, George W. Scherer, Zhidong Zhang, Direct observation of void evolution during cement hydration, Materials & Design, 136C (2017) pp. 137-149. Moradian, M., Ley, M.T., Hu, Q, Robertson, B., “Direct in-situ observation of early age void evolution in sustainable cement paste containing fly ash or limestone”, Journal of Composites Part B, accepted to be published in 2019. My website is: http://www.tylerley.com If you would like to donate to my channel please visit http://www.tylerley.com/giving A huge thanks to Hailey Goodale, my director of awesome, for editing this video.
This video uses a technique called Fast X-ray Computed Tomography to watch void formation in concrete. This video shows that the dissolved air in the mixing water can form new voids in concrete. These voids seem to increase in volume over the first two hours and then start to decrease and stop changing size after 5 h of hydration. These voids may be responsible for changing the strength and durability of concrete and have not well documented in previous studies. This work shows that by using de-aired water then the voids will not form and there is a decrease in the volume of voids when fly ash or limestone is used in the mixtures. This work was completed by Masoud Moradian for his PhD work at Oklahoma State University. We had a huge team of people that helped. This includes Qinang Hu, Mohammed Aboustait, Bret Robertson, Jay Hanan, George Scherer, and Xianghui Xiao. A special thanks goes to Zhidong Zhang, the beamline scientist at Argonne. You can find more information about this work in the following journal papers: Masoud Moradian, Qinang Hu, Mohammed Aboustait, M. Tyler Ley, Jay C. Hanan, Xianghui Xiao, George W. Scherer, Zhidong Zhang, Direct observation of void evolution during cement hydration, Materials & Design, 136C (2017) pp. 137-149. Moradian, M., Ley, M.T., Hu, Q, Robertson, B., “Direct in-situ observation of early age void evolution in sustainable cement paste containing fly ash or limestone”, Journal of Composites Part B, accepted to be published in 2019. My website is: http://www.tylerley.com If you would like to donate to my channel please visit http://www.tylerley.com/giving A huge thanks to Hailey Goodale, my director of awesome, for editing this video.