A method for considering curing temperature effect in mix proportion design of mass cement-solidified mud at high water content

Zhang, Rongjun; Qiao, Yaqing; Zheng, Junjie; Dong, Chao-qiang

doi:10.1007/s11440-020-00961-5

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…Dredged silt has high initial contents of water and clay (Cao et al, 2021b) and contains considerable quantities of salts and organic matter (Grubb et al, 2010;Huang et al, 2017;Ying et al, 2021Ying et al, , 2022, resulting in poor dehydration, difficult processing, and high soil lateral pressure (Zhang et al, 2022). A practical and reasonable solution is to improve the physical and mechanical properties of dredged silt through cement solidification, then use the solidified clay to fill structures such as embankments, banks, and artificial islands (Zhang et al, 2020). Examples include artificial island No.…”

Section: Introductionmentioning

confidence: 99%

“…Cement solidified clay (CSC) is used as a filler in construction when the construction speed is fast and there is a large pouring volume; the heat released by cement hydration accumulates in the solidified body, raising the internal solidified temperature of the CSC significantly above the ambient temperature (Zhang et al, 2020). As the on-site curing temperature varies among different regions and by season (Yun et al, 2006), it is necessary to consider the influence of temperature on CSC packing.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…In recent years, fluid-plastic cement-solidified dredged sludge (cement-stabilized clay, or CSC) has been pumped into reclamation areas to form construction sites that meet a certain mechanical strength for reclamation projects, which could solve the problem of the shortage of resources, and it is one important way to use this waste material in largescale applications [17][18][19]. Except for the characteristics of low cement content and high initial water content of CSC in reclamation projects [14,20], there are also the following two distinctive features: (1) Sludge (especially for marine sediments) usually contains a certain amount of organic matter [21][22][23][24][25], affecting the development of strength; (2) CSC is usually directly poured underwater, and the seawater temperature is used as the ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, CSC technology usually has a large filling volume and fast construction speed, which leads to the heat generated by cement hydration gathering inside the CSC, making the temperature of the whole pouring area significantly higher than the external temperature. The internal hydration heat of large-volume CSC is high, the seawater temperature varies in different sea areas, and the ambient temperature varies in different areas (e.g., the highest temperature recorded in Singapore in 2017 was 35.7 • C) [17,27,28], all of which factors are different from those in the curing environment of traditional CSC.…”

Section: Introductionmentioning

confidence: 99%

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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“…It was found that the 7 d unconfined compressive strength of the solidified sludge reached 1.536 MPa, and the strength was 121.6% higher than that of cement-solidified sludge. Zhang Rongjun [5] and others used cement as the solidified material of sea mud, and found that the curing temperature has a significant impact on the strength development. The high curing temperature not only significantly increases the early strength of the solidified sludge, but also significantly increases the late strength of the solidified sludge.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influencing Factors of Silt Solidified Soil in Flowing State

Ding¹,

Feng²,

Sun³

et al. 2019

WJET

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Every year, a large amount of silt is generated by river dredging. For the characteristics of dredging silt, such as high moisture content, low strength and high compressibility, the traditional solidification method can no longer better solve this kind of silt problem. This paper mainly studies the fluidized solidification treatment of high water content sludge, not only makes the silt soil achieve a good solidification effect, but also the project cost is lower, the construction method is more environmentally friendly and green. The influencing factors of the solidified soil are mainly investigated by the unconfined compression test and the fluidity test. The experiment result shows 1) When the cement to sludge mass ratio (R CS ) is 0.09 -0.16 and the fly ash to cement mass ratio (R FC ) is 0.35 -0.80, as the amount of R FC increases, the flow rate of the solidified soil gradually decreases. With the increase of time, the liquidity is significantly reduced, and the influence of cement on the fluidity is greater than that of fly ash. 2) When R CS = 0.09 -0.16, the strength of the sludge solidified soil at 28 d age increased by 4.5 -6 times. 3) When R CS = 0.09 -0.16 and R FC = 35% -80%, the intensity of 14 d increased by 1.23 times than that of 7 d, and the intensity of 28 days increased by 1.29 times than that of 14 d. This experiment can provide the mix ratio design of solidified materials for different needs of the project, which can better provide a basis for engineering application and strength prediction.

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A method for considering curing temperature effect in mix proportion design of mass cement-solidified mud at high water content

Cited by 16 publications

References 32 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

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

Analysis of Influencing Factors of Silt Solidified Soil in Flowing State

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