Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Cheng, Zhi; Hou, Hua; Han, Tao; Liu, Lan

doi:10.1155/2018/4150145

Cited by 14 publications

(11 citation statements)

References 31 publications

(36 reference statements)

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“…Currently, the expansibility and pozzolanic activity of CFB ashes can be used to compensate for shrinkage and increase the strength of cement-stabilised soil. However, to avoid detrimental effects on durability, it is necessary to limit the content of SO 3 [ 19 ], add additives [ 20 , 21 ], or implement a pre-hydration treatment [ 22 , 23 ] to reduce hydration-induced expansion.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Circulating Fluidised Bed Bottom Ash Content on the Mechanical Properties and Drying Shrinkage of Cement-Stabilised Soil

et al. 2021

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This study aimed to determine the effect of circulating fluidised bed bottom ash (CFB-BA) content on the mechanical properties and drying shrinkage of cement-stabilised soil. Experiments were performed to study the changes in unconfined compressive strength and expansibility of cement-stabilised soil with different CFB-BA contents and the underlying mechanisms based on microscopic properties. The results show that CFB-BA can effectively increase the unconfined compressive strength of the specimen and reduce the amount of cement in the soil. When the combined content of CFB-BA and cement in the soil was 30%, the unconfined compressive strength of the specimen with C/CFB = 2 after 60 days of curing was 10.138 MPa, which is 1.4 times that of the pure cement specimen. However, the CFB-BA does not significantly improve the strength of the soil and cannot be added alone as a cementing material to the soil. Additionally, swelling tests showed that the addition of CFB-BA to cement-stabilised soil can significantly reduce the drying shrinkage. This research project provides reference values for the application of CFB-BA in cement–soil mixing piles, including compressive strength and the reduction in the shrinkage deformation of specimens.

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Section: Introductionmentioning

confidence: 99%

The Effect of Circulating Fluidised Bed Bottom Ash Content on the Mechanical Properties and Drying Shrinkage of Cement-Stabilised Soil

et al. 2021

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“…So there exists a reasonable amount of CFB-BA. When the amount of CFB-BA is 30%, the CFST gains the maximum bonding load and maximum bonding strength [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

“…Just like fly ash, CFB-BA also contain SiO 2 and Al 2 O 3 , so it also has pozzolanic activity [ 21 ]. Researches have shown that CFB-BA has expansibility, which is closely related to the content of anhydrite and f-CaO [ 22 , 23 , 24 ]. To avoid the damage caused by expansion, the CFB-BA should be treated or the amount should be controlled during use.…”

Section: Introductionmentioning

confidence: 99%

Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash

Liu

Cheng

et al. 2021

Materials

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The interface bonding behavior between the steel tube and the concrete of concrete-filled steel tube (CFST) blended with circulating fluidized bed bottom ash (CFB-BA) was investigated in this study. A total of 8 groups of CFSTs stub columns were prepared with different dosage of CFB-BA, water-binder ratio (W/B), and interface bonding length. A series of push-out tests were carried out to acquire the data representing the interface bonding behavior. The results show that the dosage of CFB-BA has a direct effect on interface bonding behavior of CFST. CFB-BA can improve the interface bonding behavior of CFST. The highest ultimate bonding load and strength are achieved when the dosage of CFB-BA is 30%. When the dosage of CFB-BA increases to 50%, its interface bonding behavior decreases, but is still better than that of CFST without CFB-BA. W/B has a negative correlation with the interface bonding behavior of CFST. While the W/B increases, the interface bonding load and strength of CFST decreases. The increase of the interface bonding length can improve the interface bonding load, but cannot improve the interface bonding strength.

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“…e CFBC ash and CFBC slag all contain f-CaO and II-CaSO 4 , which can react to form hydration products and chemically react with other mineral components to form C-S-H gel and ettringite. And this will cause the strength of the concrete to increase rapidly and the expansion will develop inward [35], thus greatly improving the compactness of the HPC by blocking the interior water passages. erefore, the frost resistance of the HPC improved.…”

Section: 2mentioning

confidence: 99%

“…To eliminate this adverse effect, CFBC ash and CFBC slag should be modified by physical or chemical methods. Studies have shown that physical grinding can decrease the volume expansion of the concrete while increasing the activity of the admixtures [35]. In this study, to prepare HPC, fly ash, CFBC ash, and ground CFBC slag were used as admixtures to replace cement.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Durability of High‐Performance Concretes Blended with Circulating Fluidized Bed Combustion Ash and Slag as Replacement for Ordinary Portland Cement

Cheng

Liu

et al. 2020

Advances in Materials Science and Engineering

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This study investigates the mechanical properties and durability of three families of high-performance concrete (HPC), in which the first was blended with fly ash, the second with circulating fluidized bed combustion (CFBC) ash, and the third with CFBC slag. In addition to each of the three mineral additives, silica fume and a superplasticizer were also incorporated into the HPC. Hence, three families of HPC, containing 10%, 20%, and 30% mineral admixtures and 9% silica fume of the binder mass, respectively, were produced. The microstructure and hydration products of the HPC families were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to explore the influence of fly ash, CFBC ash, and CFBC slag on the compressive strength and frost resistance of HPC. The experimental results show that the compressive strength of HPC could reach 60 MPa at 28 d age. When the fly ash content was 30%, the compressive strength of HPC was 70.2 MPa at 28 d age; after the freeze-thaw cycle, the mass loss and strength loss of HPC were 0.63% and 8.9%, respectively. When the CFBC ash content was 20%, the compressive strength of HPC was 75 MPa at 28 d age. After the freeze-thaw cycle, the mass loss and strength loss of HPC were 0.17% and 0.81%, respectively.

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Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Cited by 14 publications

References 31 publications

The Effect of Circulating Fluidised Bed Bottom Ash Content on the Mechanical Properties and Drying Shrinkage of Cement-Stabilised Soil

The Effect of Circulating Fluidised Bed Bottom Ash Content on the Mechanical Properties and Drying Shrinkage of Cement-Stabilised Soil

Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash

Mechanical Properties and Durability of High‐Performance Concretes Blended with Circulating Fluidized Bed Combustion Ash and Slag as Replacement for Ordinary Portland Cement

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