Strength Characteristics of Fiber Reinforced Solidified Sludge During Drying

  • Yue Wang ,
  • Chaosheng Tang ,
  • Chao Lü ,
  • Peng Wang ,
  • Dezheng Rong ,
  • Hongsheng Wang
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  • School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
Wang Yue(1995-), female, Yancheng County, Jiangsu Province, Master student. Research areas include urban environmental geotechnical and soil improvement new technology research. E-mail:wangyuenju@smail.nju.edu.cn|Wang Yue(1995-), female, Yancheng County, Jiangsu Province, Master student. Research areas include urban environmental geotechnical and soil improvement new technology research. E-mail:wangyuenju@smail.nju.edu.cn

Received date: 2018-11-16

  Revised date: 2019-01-27

  Online published: 2019-05-27

Supported by

Project supported by the National Natural Science Foundation of China “Study on moisture transfer law and engineering properties response of viscous soil under evaporation”(No. 41572246);Jiangsu Natural Science Foundation Project “Fiber-forced filling edge under water-structure coupling conditions study on slope deformation and failure characteristics and stability evaluation”(No. BK20171228)

Abstract

Sludge is a kind of solid waste with high natural moisture content and extremely poor mechanical properties. Adopting effective technical methods for rapid dewatering and increasing strength is an important prerequisite for realizing the utilization and efficient utilization of sludge resources. In this paper, discrete short-staple polypropylene fiber was selected as the reinforced material, cement and fly ash were used as the solidified materials. The unconfined compression test was carried out to study the strength change of the fiber reinforced solidified sludge in the drying path, and the drying was analyzed. The influence mechanism of different target moisture content states(5 % ~45 % ) and fiber content(0~0.8 % ) on the strength of reinforced solidified sludge during the process. The results show that: The addition of fiber can effectively improve the peak strength and residual strength of solidified sludge, and the strength value increases first and then decreases with the increase of fiber content, and the optimal fiber content is 0.1 % . During the drying process, the sample of the unconfined compressive strength increases with the decrease of the moisture content of approximate to linear, and the damage form by the plastic damage to brittle fracture transition gradually, and the addition of fibers can effectively restrain the brittle failure sample, enhance the toughness of specimen. The contribution of fiber reinforcement to the strength of solidified sludge increases gradually with the decrease of moisture content, and the root cause is that the fiber-sludge interface force can be better excited under the condition of low moisture content.

Cite this article

Yue Wang , Chaosheng Tang , Chao Lü , Peng Wang , Dezheng Rong , Hongsheng Wang . Strength Characteristics of Fiber Reinforced Solidified Sludge During Drying[J]. Advances in Earth Science, 2019 , 34(4) : 433 -438 . DOI: 10.11867/j.issn.1001-8166.2019.04.0433

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