Use of uncontaminated marine sediments in mortar and concrete by partial substitution of cement

Zhao, Zengfeng; Benzerzour, M.; Abriak, N.‐E.; Damidot, D.; Courard, Luc; Wang, Dongxing

doi:10.1016/j.cemconcomp.2018.07.010

Cited by 67 publications

(25 citation statements)

References 33 publications

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“…A part of our project scope focuses on the valorization of dredged sediments as aggregates into concrete. To date, research on sediment reuse in construction materials has focused on the use of sediments as road materials ((1), (2), (3)), aggregates in the production of cementitious materials ((4), (5), (6), (7), (8), (9), (10)) or their introduction as partial alternatives for the raw materials in Portland cement clinker ((11), (12), (13), (14), (15), (16)). The realization of these studies required various treatment methods ; neutralization, washing, heat treatment and bio-remediation to eliminate the harmful effects of pollutants, including organic matter, which can indeed modify the setting time and compressive strength of a concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Beddaa

Fraj

Lavergne

et al. 2019

Cement and Concrete Composites

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Dredged river sediments may contain various types of organic matter that can affect the properties of a cement matrix, with the most representative part of such organic matter consisting of humic substances (HS). This work seeks to investigate the effects of humic substances on the rheology, the hydration and the strength development of a cement paste with different curing times, ranging from 1 to 90 days. Results show that adding organic matter to the cement paste offers greater workability by decreasing the yield stress. This addition also serves to retard the hydration of cement particles. Setting times increase to beyond one week when raising the amount of humic substances in the mixture, while the heat released ultimately reaches values comparable to those of the reference cement paste. Therefore, the addition of organic matter negatively affects strength development of the paste, especially at an early age; no resistance at 1-day has been noticed for HS content greater than 1%. Nevertheless, that there was no significant reduction in the compressive strength up to 20% for HS content less than 1% at 90-day. In parallel, a study on pastes containing calcium lignosulfonate (water reducer) is carried out and the same effects are observed.

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Section: Introductionmentioning

confidence: 99%

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Beddaa

Fraj

Lavergne

et al. 2019

Cement and Concrete Composites

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“…A small amount of a 2% aqueous solution of CMC and sodium carbonate powder was added to adjust the viscosity of the slurry [37]. e grain-size distribution curves of the slurries were measured using the laser particle sizer [38], shown in Figure 1. e clay contents (<0.005 mm) of the slurries were about 30%, and the silt particle contents (<0.075 mm) were greater than 97%.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum

Qian

Min

et al. 2020

Advances in Civil Engineering

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Silty sand is highly permeable and has a large internal friction angle. To ensure the stable and efficient construction of the Earth pressure balance (EPB) shield in silt stratum, it is necessary to reduce the disturbance to the stratum during tunneling and reduce the risk of spewing and blocking during soil discharge. Thus, a new type of dense slurry-EPB shield construction technology is proposed. Using a custom-made test device, the consolidation tests were conducted on sand after mixing it with different amounts of slurry to study the change in the pore pressure in the mixed soil and sand stratum and analyze the stress transmission rule. In addition, slump tests were conducted on the mixed soil to study the change in the fluidity. Based on the laboratory test results, a field investigation was carried out to study the effects of the amount of slurry addition on the pore pressure in the stratum, the driving parameters, and the sand’s flowability during shield tunneling. The results show that when the amount of slurry reaches a certain value, the filter cake effect occurs. The greater the amount of slurry added during the shield tunneling, the smaller the rate of change of the pore pressure in the stratum. When the amount of BC2 slurry added reached 8 m3 per ring, the rate of change was reduced by 57%, and the slump value improved by 93%. The type of filter cake of the DS-EPB shield was only internal filter cake during tunneling, which reduced the disturbance of the excavation face and improved the flowability of the sand. These results are of great significance to the application and promotion of DS-EPB shields in sandy cobble strata.

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“…Quanta FEG 650 pattern environmental scanning electron microscope was used to investigate the microstructure characteristic of MK-based geopolymer cemented soil under different MK contents and curing times, all of the samples were obtained from the central part of complete samples [36,37]. ese samples were coated with gold for improving their conductivity before imaging.…”

Section: Sem Testmentioning

confidence: 99%

Effects of Curing Time on the Mechanical Property and Microstructure Characteristics of Metakaolin-Based Geopolymer Cement-Stabilized Silty Clay

Zhang

2020

Advances in Materials Science and Engineering

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Metakaolin (MK), which has a fine particle size and higher activity in high alkaline environments, has been widely used in the fields of soil treatment engineering to stabilize soils. MK is used to replace part of ordinary Portland cement (OPC) with 0 : 15, 2 :13, 4 : 11 and 6 : 9 mass ratios of MK to OPC in this study. The mechanical property (e.g. stress-strain relationship, strength, and deformation performance) and microstructure characteristics of MK-based geopolymer cemented silty clay are investigated using unconfined compressive strength (UCS), nuclear magnetic resonance (NMR), and scanning electronic microscopy (SEM) tests. In addition, strength increase coefficient (ζs) and elasticity modulus increase coefficient (ζe) are defined to evaluate the effects of curing time on the mechanical property of MK-based geopolymer cemented silty clay. Moreover, the relationships among porosity, UCS, and E50 of MK-cemented silty clay are studied. By incorporating 2% MK, the UCS and E50 of MK-cemented silty clay at 28 d are 1.32 and 1.30 times compared with MK0 group, respectively. The increase rate of UCS and E50 from 1 d to 7 d is faster compared with that from 7 d to 28 d. Furthermore, the microstructure of the sample modified by 2% MK is most homogeneous and dense. Finally, the optimistic mass ratio between MK and cement is 2 : 13 for silty clay in this test condition.

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Use of uncontaminated marine sediments in mortar and concrete by partial substitution of cement

Cited by 67 publications

References 33 publications

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum

Effects of Curing Time on the Mechanical Property and Microstructure Characteristics of Metakaolin-Based Geopolymer Cement-Stabilized Silty Clay

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