Influence of Colloidal Silica and Silica Fume on the Rheology and Mechanical Properties of High-Performance Shotcrete

Yun, Kyong-Ku; Panov, Valerii; Kim, Seongkwon; Han, Seungyeon

doi:10.1007/s12205-022-0356-2

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Further, a change in the particle size of the CS caused reduced yield stress and plastic viscosity compared to those for the 10 nm particle size. The results are consistent with those obtained in another study [66]. In addition, as indicated earlier [26,58], SF increases the flow resistance of shotcrete and decreases the torque viscosity value.…”

Section: Rheological Propertiessupporting

confidence: 92%

“…Simultaneously, many studies have indicated that a decrease in the cracking resistance of mixtures with fly ash addition [28][29][30] was also associated with water absorption. In this study, fly ash was combined with colloidal silica, and thus, an insignificant reduction in crack width was observed compared to OPC in another study [66]. However, coupled with the multiple regression Model IV, it is demonstrated that an inverse relationship exists between yield stress and plastic cracking.…”

Section: Discussion Of the Resultsmentioning

confidence: 67%

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Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Yun,

Panov,

Han

2023

Materials

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Plastic shrinkage cracking is a complex and multifaceted process that occurs in the period between placement and the final setting. During this period, the mixture is viscoplastic in nature and therefore possesses rheological properties. The investigation of the relationship between rheological behavior and its propensity to undergo cracking during the plastic phase presents an intriguing subject of study. However, many factors influence plastic cracking, and the corresponding interaction of its effects is complex in nature. This study aimed to evaluate the impact of rheological and physicomechanical properties on the occurrence of plastic cracking in high-performance shotcrete containing various supplementary cementitious materials. To achieve this, plastic cracking was evaluated employing the ASTM C 1579 standard and a smart crack viewer FCV-30, and the rheological parameters were controlled using an ICAR rheometer. In addition, a study was conducted to assess the strength development and fresh properties. Further, a relationship was established via statistical evaluation, and the best predicting models were selected. According to the study results, it can be concluded that high-yield stress and low plastic viscosity for colloidal silica mixtures are indicators of plastic cracking resistance owing to improved fresh microstructure and accelerated hydration reaction. However, earlier strength development and the presence of a water-reducing admixture allowed mixtures containing silica fume to achieve crack reduction. A higher indicator of yield stress is an indicator of the capillary pressure development of these mixtures. In addition, a series containing ultrafine fly ash (having high flow resistance and torque viscosity) exhibited a risk of early capillary pressure build-up and a decrease in strength characteristics, which could be stabilized with the addition of colloidal silica. Consequently, the mixture containing both silica fume and colloidal silica exhibited the best performance. Thus, the results indicated that rheological characteristics, compressive strength, and water-reducer content can be used to control the plastic shrinkage cracking of shotcrete.

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Section: Rheological Propertiessupporting

confidence: 92%

Section: Discussion Of the Resultsmentioning

confidence: 67%

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Yun,

Panov,

Han

2023

Materials

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“…The strength of concrete is increased by fly ash up to a specified percentage increment [29]. In the mix design (in ACS), silica fume, another supplemental cement ingredient, was utilized at 8% in place of cement to increase the strength and longevity of the concrete [30]. These components were obtained from SS Corporation, together with coarse aggregate.…”

Section: Materials Sourcingmentioning

confidence: 99%

Service life optimization and life cycle assessment of concrete using SCMs as partial replacement of cement

Zahid,

Rezwan,

Redwan-Ul-Islam

et al. 2023

J. Phys.: Conf. Ser.

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Developing a concrete mixture with the lowest possible environmental impacts while improving durability performance is crucial for a sustainable environment. In this study, a Base Case Scenario (BCS) and Alternative Case Scenario (ACS) concrete mixtures were developed with identical water-to-cement ratio (w/c) of 0.4, having cement substitution of 0% and 34%, respectively. Supplementary cementitious materials (SCMs) such as silica fume, fly ash, and slag cement were implemented as cement replacing mineral admixture. A simplified life-cycle assessment (LCA) was performed to determine environmental impact reduction factors such as fossil fuel depletion, ecotoxicity, ozone depletion, carcinogenic, and global warming. Then a simulation-based approach was carried out to optimize the durability performance of concrete mixtures using Life365™. As a result, a 24.9% reduction of environmental impacts was observed with a decent service life optimization in ACS compared to the BCS mixture.

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Experimental Investigation on Anti-blocking Characteristics of Concrete Conveying Hose Using Pneumatic Hammer

Zhang

Gao

et al. 2023

Arab J Sci Eng

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Influence of Colloidal Silica and Silica Fume on the Rheology and Mechanical Properties of High-Performance Shotcrete

Cited by 7 publications

References 17 publications

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Service life optimization and life cycle assessment of concrete using SCMs as partial replacement of cement

Experimental Investigation on Anti-blocking Characteristics of Concrete Conveying Hose Using Pneumatic Hammer

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