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Geomechanics and Engineering Volume 13, Number 2, August 2017 , pages 319-330 DOI: https://doi.org/10.12989/gae.2017.13.2.319 |
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Experimental study on vacuum preloading with flocculation for solid-liquid separation in waste slurry |
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Yajun Wu, Gangqiang Kong, Yitian Lu and De'an Sun
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| Abstract | ||
| This vacuum preloading combined with polyacrylamide (PAM) flocculation was proposed to separating solid-liquid in waste slurry and to improving bearing capacity of soft soil ground. By using waste slurry taken from drilled shaft construction site in Shanghai, China, a series of settling column tests with four typical flocculants and one normal for waste slurry were carried out for comparative analysis. The optimal amounts for each flocculant were obtained from the column tests. Then, model tests on vacuum preloading with anionic polyacrylamide (APAM) flocculation and without flocculants were carried out. The out of water and the settlement of slurry surface ground were monitored during the model tests, and the changes in water content, particle-size and pore-size distributions in different positions after the model tests were measured and discussed. It is found that water content of the waste slurry without APAM flocculation changed from 204 to 195% by 24 hours standing and 15 hours vacuum preloading, while the water content of the waste slurry with APAM flocculation was declined from 163 to 96% by 24 hours standing, and was further reduced into 37% by 136 hours vacuum preloading, which shows that the combined method is feasible and effective. | ||
| Key Words | ||
| vacuum preloading; flocculants; waste slurry; settling column tests; model test | ||
| Address | ||
| (1) Yajun Wu, Yitian Lu, De'an Sun: Department of Civil Engineering, Shanghai University, 99 Shang Da Road, Shang Hai, China; (2) Gangqiang Kong: College of Civil and Transportation Engineering, Hohai University, 1 Xi Kang Road, NanJing, China. | ||