Impacts of Coarse-Aggregate Gradation on the Workability of Slip-Formed Concrete

Cook, Marllon Daniel; Ghaeezadah, Ashkan; Ley, M. Tyler

doi:10.1061/(asce)mt.1943-5533.0002126

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…All types of collected CA were tested for ACV-aggregate crushing value [15], gradation [16], absorption and specific gravity [17], voids and unit weight [18], AIV-aggregate impact value, resistance to abrasion-induced deterioration, and the Los Angles (LA) machine's impact [19]. The determination of aggregate grade is a crucial stage in the development of concrete mixtures [20]. Local aggregate sources often produce concrete economically [21,22].…”

Section: Methodsmentioning

confidence: 99%

Concrete Strength and Aggregate Properties: In-Depth Analysis of Four Sources

Hosen,

Al Maruf,

Howlader

et al. 2024

Civ Eng J

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In the field of Reinforced Concrete Construction, concrete emerges as the predominant and extensively employed construction material. Concrete comprises a solid, chemically inert granular substance called coarse aggregate (CA) bonded with cement and water. Compared to fine aggregate or cement, CA has a larger volume of concrete. By examining the characteristics of the coarse aggregate using various laboratory testing processes, the coarse aggregate may be properly used in concrete. Bangladesh is experiencing significant growth in its infrastructure industry due to the construction of mega projects nationwide. For the building of RCC in Bangladesh, coarse aggregate is mainly procured from two sources in Bangladesh, and another is imported from China. This study aims to develop a clear understanding of aggregate and concrete strength quality for different coarse aggregates and track changes in the appearance of CA from multiple sources in China and Bangladesh. Coarse aggregates were collected from four prominent sources: Jaflong and Bholaganj (Bangladesh), Shandong, and Jiangsu (China). ACV (aggregate crushing value), gradation, voids, and unit weight; AIV (aggregate impact value), absorption, specific gravity, and resistance to abrasion-induced deterioration; and Los Angeles (LA) machines’ impact tests have been conducted for all sources of CA. The concrete cylinder was made and tested for all sources of CA with the same ratio of cement, sand, and water to know the concrete strength for different CAs. Doi: 10.28991/CEJ-2024-010-04-016 Full Text: PDF

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Section: Methodsmentioning

confidence: 99%

Concrete Strength and Aggregate Properties: In-Depth Analysis of Four Sources

Hosen,

Al Maruf,

Howlader

et al. 2024

Civ Eng J

View full text Add to dashboard Cite

show abstract

“…Based on the principle of concrete vibration densification, Date et al observed the densification corresponding to the state of vibration by varying the admixture and sand rate of freshly mixed concrete and found that the vibration densification was higher as the admixture and sand rate increased [16]. Cook proposed the Box-Test method to evaluate the workability of slipform concrete after high-frequency vibration [17]. For slipform concrete, its construction performance has a close relationship with the concrete mix ratio [18][19][20], but also with the vibration frequency, radius of action, and amplitude of the vibrating rod.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Vibrating Process on the Compactness of Slipform Concrete

Chai

Cheng

2023

Applied Sciences

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Compaction directly affects concrete’s strength and durability. In this paper, the relationship between vibration parameters and compactness is modeled by using colored aggregates and image methods to analyze the compactness of concrete characterized by pore structure. Experiments were conducted to investigate the effects of vibrating frequency and duration on the aggregate distribution coefficient, segregation rate, and porosity of slipform concrete. The test results showed that the smaller the aggregate size under high-frequency pounding, the better the concrete compactness. In addition, the aggregate segregation rate and concrete strength increased and then decreased with the pounding length, and the greater the pounding frequency, the more pronounced the trend. Lastly, the concrete’s internal porosity increased and then decreased with the pounding length. This study obtained the control range of aggregate segregation rate and porosity through analysis, and established equations for the optimal vibration parameters and paving speed of sliding form concrete to guide the reasonable control of actual sliding form paving and vibration construction processes.

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“…Previous studies concluded that BA technique could improve the workability of fresh concrete [8][9][10][11]. Moreover, better workability can reduce the w/cm ratio of the concrete mix to achieve the target slump.…”

Section: Introductionmentioning

confidence: 99%

Reducing cementitious paste volume of slipformed pavement concrete by blending aggregates

Chung

Subgranon

Tia

2020

Int. J. Pavement Res. Technol.

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A high cementitious paste volume (CPV) can increase the early cracking tendency of the concrete and reduce the durability of concrete pavement. This study investigated the effects of minimized CPV in slipformed pavement concrete (SPC) with blended aggregates (BA). Based on the laboratory results, the performance of pavement concrete with different CPV was evaluated. The CPV of standard SPC can be reduced to 25.0% without affecting its properties as evaluated by compressive strength, drying shrinkage and surface resistivity tests However, the CPV of SPC with optimized aggregate gradation (OAG) using BA technique can be further reduced to 22.5% with satisfactory properties. The SPC mixes with OAG was noted to have better potential performance as a pavement concrete. SPC concrete using Portland limestone cement can give similar properties as those of the conventional concrete using ordinary Portland cement.

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Impacts of Coarse-Aggregate Gradation on the Workability of Slip-Formed Concrete

Cited by 10 publications

References 5 publications

Concrete Strength and Aggregate Properties: In-Depth Analysis of Four Sources

Concrete Strength and Aggregate Properties: In-Depth Analysis of Four Sources

Study on the Effect of Vibrating Process on the Compactness of Slipform Concrete

Reducing cementitious paste volume of slipformed pavement concrete by blending aggregates

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