Modification of nanoparticles for the strength enhancing of cement-stabilized dredged sludge

Lang, Lei; Chen, Bing; Duan, Haijuan

doi:10.1016/j.jrmge.2021.01.006

Cited by 36 publications

(10 citation statements)

References 49 publications

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“…Based on A4, Group B was used to assess the effects of the fiber content on the mechanical behavior of the grouting material. Based on B1, Group C was used to investigate the effects of fiber length on the solidified mechanical behavior [ 42 , 43 ]. Similar tests and methods can be found in the literature [ 42 , 43 ].…”

Section: Methodsmentioning

confidence: 99%

“…Based on B1, Group C was used to investigate the effects of fiber length on the solidified mechanical behavior [ 42 , 43 ]. Similar tests and methods can be found in the literature [ 42 , 43 ]. Each test No.…”

Section: Methodsmentioning

confidence: 99%

“…The mold was smeared with silicone oil to minimize the friction for demolding ( Figure 2 a). The vibration process at 1 Hz was expected to remove the air trapped in the specimen on the vibration table [ 42 , 43 , 46 , 47 ]. Finally, both ends of the specimen in the mold were leveled and carefully wrapped with vinyl foam.…”

Section: Specimen Preparation and Experimental Programmentioning

confidence: 99%

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A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Liu²,

Zhang

et al. 2022

Materials

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The aim of this study is to assess the workability of an innovative rubber concrete to fill in the gaps in a shield tunnel construction. This grouting material includes porous sand, PVA (polyvinyl alcohol) fiber, cement, and rubber. One advantage of the material is its high toughness, which is good for the postfailure stage of an earthquake event. Evaluations were carried out on the physical properties in terms of the slurry density, consistency, fluidity, bleeding rate, consolidation shrinkage rate, setting time, and unconfined compressive strength (UCS) (i.e., 3 and 28 days). The toughness index was also introduced to evaluate the performance at the postfailure stage. The results demonstrate that the toughness index will increase as the rubber content increases. It increases from 1.0 at 0% to 1.7 at 80% rubber content (28 days’ curing) and from 1.2 at 0% to 2.2 at 80% rubber content (3 days’ curing). The increase in fiber content and fiber length will also increase the toughness index as the fiber will enhance the tensile strength of the matrix. The results show that when the fiber content increases from 0% to 1%, the toughness index increases from 1 to 7 (28 days’ curing) and from 1.1 to 10 (3 days’ curing). Similarly, if the fiber content or fiber length is above the optimum level, the UCS of the material will be compromised. The optimum fiber content is 0.8%, and the optimum fiber length is 6 mm to 9 mm. This study suggests that the balance of physical properties should be considered in designing a satisfactory grouting material based on the specific purpose of the engineering practice.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Specimen Preparation and Experimental Programmentioning

confidence: 99%

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A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Liu²,

Zhang

et al. 2022

Materials

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“…Adding binders to the soil is frequently used to modify soil's engineering properties. Te cement-soil mixing technique is widely employed in feld construction for enhancing strength and improving compressibility of soil such as silty clay, clay, and sewage sludge [1][2][3][4][5]. Unconfned compressive strength (UCS) is one of the most important soil parameters that describe soil strength, and it can be improved by adding cement to the soil.…”

Section: Introductionmentioning

confidence: 99%

Performance of Excavated Sulfur-Rich Soil Stabilized with Binder: A Field Study of Mixing Efficiency

Ziagharib

Maurice

Mácsik

et al. 2023

Advances in Civil Engineering

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In this study, a mixing procedure of sulfur-rich soil and cement-based binder to enhance the soil’s unconfined compressive strength (UCS) was tested in field conditions for geotechnical applications. The focus was to evaluate uniformity of industrial size soil-binder mixture, blended by existing method. This paper outlined sampling strategy and the number of samples needed for a valid uniformity evaluation. Moreover, this study emphasized the difference between field mixing and laboratory mixture preparation by comparing UCS of stabilized soil samples in the field and UCS of corresponding samples mixed and prepared in the laboratory environment. In the field, soil and cement were blended in two to four stages with 5% and 7% cement—the percentages being based on the soil’s dry weight under field conditions. Samples were taken from the field mixtures after each stage. Since the number of samples needed to be representative of mixture characteristics for large-scale mixing is not standardized, this field experiment included two phases. The first phase was dedicated to finding a sampling strategy for a large soil pile along with measuring UCS of collected samples. In the second phase, sample collection was conducted based on the results of sampling strategy from the first phase. In the laboratory, samples with percentages of binder similar to the amount of binder in the field were also prepared. Both field and laboratory samples were prepared using the tapping method in the laboratory for UCS test. Samples were cured under similar conditions for 28 days. The results showed that the uniformity of mixture improved after each additional mixing stage. In addition, while spots with low UCS were observed in the second mixing step, these spots were eliminated in the third mixing step, and results of the UCS tests were comparatively uniform. Moreover, comparison of the samples revealed that the UCS of the laboratory mixture is higher than that of the field mixture. This showed that even though the UCS is a good standard for comparing the strength of different soils stabilized with different percentages or types of binders in the field mixing, the actual strength of the stabilized mixtures under field circumstances is lower than that in laboratory prepared mixtures.

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“…Akono [ 21 ] investigated the relationship between nano-TiO 2 and CSH gel in Portland cement paste. Liu et al [ 22 ], Lang et al [ 23 ], Sargam et al [ 24 ], Ikotun et al [ 25 ], and Ren et al [ 26 ] analyzed the effects of different nanoparticles (e.g., nano-SiO 2 , nano-Al 2 O 3 , nano-CaCO 3 , nano-MgO, nano-TiO 2 , grapheme oxide, and carbon nanotube) on the strength characteristics and engineering performance of different cement-based materials. They considered that the nanomaterials had a similar function for cement-based materials, and nano-SiO 2 could provide the most significant modification effect.…”

Section: Introductionmentioning

confidence: 99%

High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

Ren

Zhao

et al. 2021

Materials

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Cement grouting material is one of the most important materials in civil construction at present, for seepage prevention, rapid repair, and reinforcement. To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the specific performance of high fluidization, early strength, and low shrinkage. In recent years, nanomaterials have been widely used to improve the engineering performance of cement grouting materials. However, the mechanisms of nanomaterials in grouting materials are not clear. Hence, a high-fluidization, early strength cement grouting material, enhanced by nano-SiO2, is developed via the orthogonal experimental method in this study. The mechanisms of nano-SiO2 on the microstructure and hydration products of the HCGA, in the case of different curing ages and nano-SiO2 contents, are analyzed through scanning electron microscopy tests, X-ray diffraction tests, differential scanning calorimetry tests, and Fourier transform infrared spectroscopy tests.

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Modification of nanoparticles for the strength enhancing of cement-stabilized dredged sludge

Cited by 36 publications

References 49 publications

A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Performance of Excavated Sulfur-Rich Soil Stabilized with Binder: A Field Study of Mixing Efficiency

High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

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