Effect of fine aggregate size on the overlapping of interfacial transition zone (ITZ) in mortars

Lyu, Kai; She, Wei; Chang, Honglei; Gu, Yue

doi:10.1016/j.conbuildmat.2020.118559

Cited by 77 publications

(18 citation statements)

References 64 publications

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“…According to the mechanical results, the improved hydration degree actually shows no obvious benefit, as the porosity of CPB specimens is the dominant parameter. The interfacial transition zone (ITZ) is a relatively complex and heterogeneous region that is important at the macroscopic scale for the overall assessment of material properties The interfacial transition zone (ITZ) is a relatively complex and heterogeneous region that is important at the macroscopic scale for the overall assessment of material properties [31]. In hardened CPB materials, the spaces between the TS are filled with hardened hydration products consisting of an ITZ layer surrounding each TS grain and a bulk slurry located outside the ITZ region and further from the TS surface [32,33].…”

Section: Microstructurementioning

confidence: 99%

“…Chen et al [17] also concluded that an increase in the proportion of PAM additives resulted in larger floccule links and a more stable paste structure. The interfacial transition zone (ITZ) is a relatively complex and heterogeneous region that is important at the macroscopic scale for the overall assessment of material properties [31]. In hardened CPB materials, the spaces between the TS are filled with hardened hydration products consisting of an ITZ layer surrounding each TS grain and a bulk slurry located outside the ITZ region and further from the TS surface [32,33].…”

Section: Microstructurementioning

confidence: 99%

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The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

et al. 2022

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Cemented paste backfill (CPB) has become a significant structural material in most mines across the world. In this study, the effects of chemical rheological additives including viscosity modifying agent (i.e., polyacrylamide) and polycarboxylate superplasticizer (PCE) on fresh and hardened properties of CPB with different water-to-solid (W/S) ratios and water-to-cement (W/C) ratios were investigated. The microstructure of CPB specimens was also characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and backscattered electron image (SEM-BSE). The obtained results indicate that PAM (polyacrylamide) dosage and W/S are the most significant parameters influencing the workability of fresh CPB mixtures. For the hardened CPB specimens, the decreasing W/S ratio leads to higher flexural and compressive strength values and lower dry shrinkage strains. The interfacial transition zone (ITZ) between the cement matrix and the tailings sand was also observed to be narrower, with fewer micro cracks and capillary pores. Meanwhile, the existence of PAM decreased the number of hydration products and retarded the hydration reaction. Overall, the CPBs with high W/C ratios (i.e., 1.0 and 1.2), low W/S ratios (i.e., 0.3), and moderate amounts of rheological additives (i.e., 0.05% PAM and 1.0% PCE) have excellent fresh and hardened properties. The findings of this study contribute to better optimization of CPB mixtures in backfill construction, bringing benefits of low costs and low environmental impacts.

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Section: Microstructurementioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

et al. 2022

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“…Figure 5 shows a secondary electron (SE) image of the mortar containing the MFS slag as aggregate, where the interfacial transition zone (ITZ) divides the aggregate and binder. The ITZ is a transition zone, and its effective "width" depends upon the used aggregate and the reaction degree of the binder [34][35][36]. Figure 6 shows a typical ITZ in an MFS slag mortar.…”

Section: Microstructural Investigation and Elemental Mappingmentioning

confidence: 99%

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

Sivakumar¹,

ruyaert²,

Belie³

et al. 2021

RPM

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Depending on the availability of aggregate sources pertaining to their geographic locations, the concrete industry utilizes conventional aggregates such as marine sand, dredged gravel, or crushed rocks. This method requires high energy and high processing costs for washing and grinding. The objective of this work is to use Modified Ferro silicate slag (MFS), a by-product obtained from the copper industry, as an alternative to the conventional fine aggregates found in mortar. No additional processing such as washing or grinding is required. By using the MFS slag as an aggregate in mortar or concrete, the factors of sustainability and a circular economy are enhanced. The current study focuses on the characterization of the MFS slag, including the mortar mixes with the MFS slag as a fine aggregate, and shows that the MFS slag can be a promising raw material to replace conventional aggregates in mortar. The leaching of its heavy elements such as Sb, As, Cr, Mo, Pb, and Zn was conducted well within limits (VLAREMA 4). The SEM and MIP analyses indicated that the porosity of the MFS slag mortar was higher compared to the standard aggregate mortar. Moreover, the MFS slag mortar showed acceptable resistance toward the alkali-silica reaction and carbonation.

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“…At the same time, an appropriate amount of fines can improve the bonding of aggregate and cement, improve the packing of concrete and the mechanical properties of concrete. As a result, the performance of concrete at this time is not worse than that of river sand concrete [ 16 , 17 , 18 , 19 , 20 ]. However, excessive fines content will negatively affect the performance of concrete [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Fines Content on Durability of High-Strength Manufactured Sand Concrete

2023

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Manufactured sand is one of the effective ways to alleviate the extreme shortage of natural sand in the construction industry. This paper uses granite and limestone manufactured sand to study the effect of high fines content on the durability of high-strength manufactured sand concrete, and analyzes its influence mechanism by combining macro and micro test methods. The results show that the carbonation depth of manufactured sand concrete is the smallest when the fines content is 10%. When the fines content is less than 15%, the chloride and sulfate impermeability of concrete are improved effectively. Through macroscopic and microscopic tests, it is found that the main reason why fines can improve the durability of concrete is the filling effect. Too much fines will inhibit the hydration of cement and adversely affect the durability of concrete. Therefore, the fines content of high-strength manufactured sand concrete should be controlled within 5~15%, and the durability is the best when the fines content is 10%.

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Effect of fine aggregate size on the overlapping of interfacial transition zone (ITZ) in mortars

Cited by 77 publications

References 64 publications

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

Effects of Fines Content on Durability of High-Strength Manufactured Sand Concrete

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