Enhancing the mechanical properties of marine clay using cement solidification

Dahal, Bhim Kumar; Zheng, Junjie; Zhang, Rongjun; Song, Dingbao

doi:10.1080/1064119x.2018.1484532

Cited by 16 publications

(7 citation statements)

References 38 publications

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“…Figure 2 shows the variation of q u as a function of the initial water content w of CSC at different curing ages. For a given cement content, the strength of solidified sludge decreases nonlinearly with the increase of w. Combined with the change law of q u with A w analyzed above, q u increases and decreases nonlinearly with the increase of A w and w, respectively, which is consistent with the previous research results [51]. In CSC, cement hydration products are mainly calcium silicate hydrate (CSH) and calcium hydroxide (Ca(OH) 2 ), which contribute to the strength development.…”

Section: Influences Of Cement Incorporation Ratio and Water Content O...supporting

confidence: 92%

Strength Properties of Cement-Solidified Dredged Sludge Affected by Curing Temperature

Cao

Zhang²,

Zhao

et al. 2022

Buildings

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In this study, unconfined compressive strength (qu) tests were conducted to explore the coupling effect of organic matter content (3.7%, 7.7%, 10.7%, and 13.7%) and curing temperature (18 °C, 36 °C, 46 °C) on the development of early and mid-late strength of cement-solidified dredged sludge (cement-stabilized clay, or CSC). The microstructure of the CSC containing organic matter at different curing temperatures was also analyzed. The results show that qu of CSC decreases with the increase in organic matter content (Co). The strength growth rate of CSC in the mid-late stage (≥14 days) is small when Co ≥ 7.7%, and it is difficult to increase this strength growth rate even if the curing temperature is increased up to 46 °C. There is a cement incorporation ratio threshold of 15% for qu of CSC containing organic matter (Co = 7.7%), which is not affected by curing temperature; increasing the cement incorporation ratio (to 20%) cannot increase qu significantly. The CSC with high curing temperature has more hydration products and higher structural compactness, and it can obtain higher qu in the early and mid-late stages. A high curing temperature can increase the early strength growth rate and shorten the curing age for CSC containing organic matter.

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Section: Influences Of Cement Incorporation Ratio and Water Content O...supporting

confidence: 92%

Strength Properties of Cement-Solidified Dredged Sludge Affected by Curing Temperature

Cao

Zhang²,

Zhao

et al. 2022

Buildings

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“…This process is referred to by the word “carbonation” 30 . This is evidence that the pH of the concrete is decreasing, which in turn leads the steel to begin corroding 31 . Chlorides can be transferred from concrete to steel in a process known as chloride-induced corrosion 32 .…”

Section: Introductionmentioning

confidence: 98%

Cost-effective and green additives of pozzolanic material derived from the waste of alum sludge for successful replacement of portland cement

Mohamed

Farghali

Eessaa

et al. 2022

Sci Rep

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The major objective of this study was to examine the viability of using 5, 10, or 15 mass% of Activated Alum Sludge waste (AAS) instead of Ordinary Portland Cement (OPC) as a pozzolanic ingredient in concrete. This fundamental inquiry framed the investigation and OPC-AAS-hardened composites were studied to see whether they may benefit from inexpensive nanocomposites in terms of improved physical properties, mechanical strength, and resistance to heat and flame. The investigation set out to see how inexpensive nanocomposite might be put to use and the nanoparticles of CuFe2O4 spinel with an average size of less than 50 nm were successfully manufactured. Many different OPC-AAS-hardened composites benefit from the addition of CuFe2O4 spinel, which increases the composites' resistance to fire and enhances their physicomechanical properties at roughly average curing ages. Synthesized CuFe2O4 spinel was shown to have desirable characteristics by TGA/DTG and XRD. By using these methods, we were able to identify a broad variety of hydration yields, including C–S–Hs, C–A–S–Hs, C–F–S–Hs, and Cu–S–Hs, that enhance the physicomechanical properties and thermal resistivity of OPC-AAS-hardened composites as a whole. The composite material comprising 90% OPC, 10% AAS waste, and 2% CuFe2O4 has several positive economic and environmental outcomes.

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“…The marine reclamation method can be used to increase the land area in coastal regions [1]. Marine dredged soil, commonly utilized in reclamation, has characteristics including high compressibility, high water content, low bearing capacity, and low permeability [2][3][4]. The drainage consolidation method is economical and efficient, making it a prevalent choice for large-scale marine reclamation [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Affecting Vacuum Formation and Drainage in the Siphon-Vacuum Drainage Method for Marine Reclamation

Shu,

Wang,

Chen

et al. 2024

JMSE

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Traditional drainage methods for marine reclamation typically consume large amounts of energy and have a negative environmental impact. The siphon-vacuum drainage method (SVD) automatically forms a vacuum and drains using less energy. It has significant potential for research and application. In this study, a theoretical model is used to calculate the vacuum formation process and drainage rate. Qualitative analysis and global sensitivity analysis were conducted to investigate the effect of various factors in the SVD on vacuum formation and drainage. The qualitative analysis suggests that modifying the length and diameter of the siphon pipe and the thickness of the sealing soil column to increase the siphon rate can improve the vacuum degree and drainage efficiency. Sobol global sensitivity analysis reveals that the sealing soil column thickness is the main factor affecting the vacuum, with a first-order sensitivity index accounting for up to 79.48%. The impact of cylinder diameter and the local resistance coefficient (0.43%) can be almost neglected. A fitting equation for estimating the maximum achievable vacuum is provided. Calculations show that the vacuum formed by the SVD can reach over 80 kPa. This work can help optimize SVD design and advance environmentally friendly marine reclamation projects.

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Enhancing the mechanical properties of marine clay using cement solidification

Cited by 16 publications

References 38 publications

Strength Properties of Cement-Solidified Dredged Sludge Affected by Curing Temperature

Strength Properties of Cement-Solidified Dredged Sludge Affected by Curing Temperature

Cost-effective and green additives of pozzolanic material derived from the waste of alum sludge for successful replacement of portland cement

Analysis of Factors Affecting Vacuum Formation and Drainage in the Siphon-Vacuum Drainage Method for Marine Reclamation

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