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| Performance of CaO Reinforced Composite Cementitious Materials |
GUO Lei1,2,3,4, WANG Zekun1, GUO Lixia1,2,3( ), CHEN Pingping1, WANG Lunyan1,2,3, LI Mingru1, WANG Weikai1 |
1.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
2.Henan Water Valley Research Institute, Zhengzhou 450046, China
3.Henan Key Laboratory of Water Environment Simulation and Treatment, Zhengzhou 450002, China
4.Henan Water Conservancy Investment YuYuan Water Ecology Co. Ltd., Pingyu 463400, China |
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Cite this article:
GUO Lei, WANG Zekun, GUO Lixia, CHEN Pingping, WANG Lunyan, LI Mingru, WANG Weikai. Performance of CaO Reinforced Composite Cementitious Materials. Chinese Journal of Materials Research, 2022, 36(4): 278-286.
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Abstract Unburned brick was prepared with sludge containing heavy metals as raw material, and CaO as calcium source to optimize the composition of the composite cementitious material and to regulate the hydration products and unhydrated phases in the cementitious slurry. First, the Ca/Si ratio (Ca/Si) of the composite cementitious system was calculated based on the mix ratio of raw materials of unfired bricks. Then, an experimental scheme of unfired bricks with varying amount of CaO was designed, and the Ca/Si ratio was quantitatively controlled within the range of 0.8~1.2. The mechanism of CaO improving the properties of high silicon composite cementitious materials was investigated by means of transmission electron microscopy (TEM) and energy spectrum (EDS) and PCAS software. The results show: with the increasing Ca/Si ratio within the range of 0.8~1.2, the mechanical properties of the unfired brick enhance first and then decrease. The optimal value of Ca/Si is 1.0, and there is also an optimal control value of CaO;With the increasing Ca/Si ratio, the water absorption decreases firstly and then increases for the bricks on the 7th day after they were made, and the water absorption decreases linearly for those on the 28th day;With the increasing Ca/Si ratio, the porosity of the plane pore size greater than 200 μm decreases for the prepared bricks, and the fractal dimension decreases first and then increases; For the pore size smaller than 200 μm, with the increase of Ca/Si, the pore size between 200 nm~200 μm decreases, and the pore size smaller than 200nm increases, while the pore size decreases; and Last but not least, the leaching amount of heavy metals from the unburned bricks can be inhibited up to more than 70% by the formed composite cementitious material.
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Received: 09 February 2021
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| Fund: Natural Science Foundation of Henan Province(202300410270);Fund of Innovative Education Program for Graduate Students at North China University of Water Resources and Electric Power(YK2020-04);Science and Technology Project of Henan Water Resources Department(GG202040) |
About author: GUO Lixia, Tel: 15303811561, E-mail: guolx@126.com
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