Using Alkali-Activated Cementitious Materials to Solidify High Organic Matter Content Dredged Sludge as Roadbed Material

Gu, Zhongwei; Hua, Sudong; Zhao, Wenrui; Li, Sisheng; Gao, Zhen; Shan, Haitao

doi:10.1155/2018/2152949

Cited by 14 publications

(9 citation statements)

References 28 publications

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“…Previous studies of the effect of temperature have focused mainly on concrete materials, granular soil, and fine clay (Chitambira, 2004;Bai et al, 2019Bai et al, , 2022, but few have examined soft clay containing organic matter. Gu et al (2018) reported silt in a river beach in Shenzhen, China, to contain up to 15.6% organic matter. Du et al (2020) also highlighted the important influence of organic matter on the development of strength in cement-stabilized clay.…”

Section: Introductionmentioning

confidence: 99%

Strength Properties and Prediction Model of Cement-Solidified Clay Considering Organic Matter and Curing Temperature

Cao

Zhang²,

et al. 2022

Front. Mater.

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Cement-solidified clay (CSC) is an important filler material in land reclamation projects. Its strength is greatly affected by its organic matter content and curing temperature. This work reports an experimental study of the unconfined compressive strength (UCS) of CSC with respect to its initial water content w, cement incorporation ratio Aw, organic matter content Co, curing temperature T, and curing duration. A model (UCSOT) for predicting the UCS of CSC is established considering the influence of organic matter and curing temperature. A procedure to implement the model is proposed, and the accuracy of the model is verified. The results show that for a given curing duration, UCS decreases with increases in Co and w, and increases with increases in T and Aw. The influence of organic matter on the UCS is greatly affected by Aw, with a threshold of Aw = 15%. High-temperature curing increases the early and ultimate strengths of CSC, and organic matter increases this temperature sensitivity. Multiple regression characterization using cement content, w, and Co as independent control parameters accurately reflects the UCS at the reference temperature. On this basis, the UCSOT model established here considering the influence of organic matter and curing temperature has universal applicability.

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Section: Introductionmentioning

confidence: 99%

Strength Properties and Prediction Model of Cement-Solidified Clay Considering Organic Matter and Curing Temperature

Cao

Zhang²,

et al. 2022

Front. Mater.

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“…ese products have low radioactively detection indices [8]. (v) In terms of roadbed materials, phosphogypsum is mainly used as a stabilizer [9] and solidifier [10] to treat sludge, so as to meet the requirements of roadbed materials.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behaviour of Cast-In-Situ Phosphogypsum-Reinforced Concrete Grid Frame Composite Walls

Zhang

Chen

et al. 2019

Advances in Civil Engineering

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This paper mainly studies the effect of cast-in-situ phosphogypsum on seismic behaviour of reinforced concrete grid frame. The mechanical behaviour of three reinforced concrete grid frames and four cast-in-situ phosphogypsum-reinforced concrete grid frame composite walls under low cycle alternating load was designed and tested. The test results show that the reinforced concrete grid frame has less bearing capacity and poor energy consumption. The addition of cast-in-situ phosphogypsum can effectively improve the seismic behaviour of the reinforced concrete grid frame. Compared with the reinforced concrete grid frame, the bearing capacity of the cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall is increased by 2-3 times, the displacement ductility coefficient is increased by 0.95∼1.2 times, and the relative accumulative energy consumption is increased by 86%∼216%. This shows that the composite wall has better bearing capacity, ductility, and energy dissipation capacity.

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“…and strong oxidants (KMnO 4 ). Gu et al 60 comprehensively confirmed that solidified dredged sludge can meet the requirements of roadbed materials based on the properties of unconfined compressive strength, hydration products, toxicity characteristics, water stability, freeze-thaw resistance and volume stability. Even for industrial sludge containing a large amount of heavy metals, such as textile sludge 61 and electroplating sludge, 62 cement-fly ash can be used to solidify/stabilize the sludge 50 The upper half is the 28d compressive strength of sludge bricks solidified with different kinds of cement (cement:sludge:water = 1:0.5:0.5).…”

Section: Application Of Silt and Sludgementioning

confidence: 97%

Utilization of silt, sludge, and industrial waste residues in building materials: A review

Hao

Song

Wang

et al. 2022

Journal of Applied Biomaterials & Functional Materials

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To promote the effective utilization of sludge and slag produced in nature and from human activities, this paper summarizes the research progress in the field of building materials on the basis of expounding their classification and characteristics. (1) Sludge and slag include silt, sludge and industrial waste residues. These three materials are mainly composed of SiO2, which can be used to produce building materials after treatment and can also be used as admixtures, including roadbed admixtures. (2) Silt and sludge are widely used in building wall materials and roadbed materials, etc. Industrial waste residues can be used in the production and processing of green concrete and glass-ceramics. (3) In addition to continuing to use existing utilization methods, key treatment technologies and new treatment devices can be further developed according to the characteristics of sludge and slag. Moreover, observations and mechanistic analysis of the microscopic structure of industrial waste residues and research on strong and weak utilization methods based on the performance of building materials can be carried out, and more efficient and energy-saving excitation or activation technologies will be developed. These efforts will eventually lead to the development of functional building materials with excellent performance and environmentally friendly characteristics to achieve the differentiated utilization of silt, sludge, and industrial waste residues and realize the efficient transformation of resources. This paper provides useful insights for the application of sludge and slag in the field of building materials.

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Using Alkali-Activated Cementitious Materials to Solidify High Organic Matter Content Dredged Sludge as Roadbed Material

Cited by 14 publications

References 28 publications

Strength Properties and Prediction Model of Cement-Solidified Clay Considering Organic Matter and Curing Temperature

Strength Properties and Prediction Model of Cement-Solidified Clay Considering Organic Matter and Curing Temperature

Seismic Behaviour of Cast-In-Situ Phosphogypsum-Reinforced Concrete Grid Frame Composite Walls

Utilization of silt, sludge, and industrial waste residues in building materials: A review

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