Roller-Compacted Concrete

Schrader, Ernest K.

doi:10.1201/9781420007657.ch20

Cited by 14 publications

(4 citation statements)

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“…Since less cement is used, the hydration heat produced by RCC is much less than that produced by conventional concrete. Therefore, the rate of hydration process is slower in RCC [3]. Yet, due to huge volume of RCC dams, hydration heat inside the center can't dissipate to surrounding air, which may cause considerable surface temperature gradient and thus leads to the cracking on the surface of the dam.…”

Section: Introductionmentioning

confidence: 99%

Influence of Casting Temperature and Solar Radiation on the Thermal Field in Roller Compacted Concrete during Construction

Jiang

Zhan

Xiao

2013

AMM

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Since RCC dams huge volume and poor heat dissipation, thermal analysis plays an important role in the design and construction of RCC dams. This paper focuses on the application and verification of a two-dimensional finite element code developed for the thermal analysis of RCC dams. The effects of solar radiation and casting temperature were also evaluated in the analysis. The result has shown that, solar radiation has an evident influence on temperature history of both central and surface nodes in late ages, but contributes less to the temperature difference of them on the contrary. On the other hand, casting temperatures effect on temperature difference is obvious.

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Section: Introductionmentioning

confidence: 99%

Influence of Casting Temperature and Solar Radiation on the Thermal Field in Roller Compacted Concrete during Construction

Jiang

Zhan

Xiao

2013

AMM

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“…It should be noted that most of the studies are pertinent to laboratory conditions and, thus, it is imperative to validate the laboratory findings with the field performance. Therefore, few studies have compared the laboratory and field results; the major findings suggest that the employment of a VT could result in an underestimation of field properties (16,37), while the selection of a VH could lead to overestimation (6,38,39). However, the reason for this distinct behavior is still unclear.…”

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confidence: 99%

Tailoring of Compaction Parameters of the Vibratory Table and Vibratory Hammer for Roller Compacted Concrete Pavements to Resemble Field Properties

Selvam

Singh

2023

Transportation Research Record: Journal of the Transportation R

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Previous studies have indicated that roller compacted concrete pavement may demonstrate significant variations in field behavior compared to laboratory specimens. This discrepancy can be attributed to the dissimilarities in compaction efforts between laboratory and field conditions, wherein the laboratory efforts fail to emulate the field compaction. Thus, in the present study, efforts have been made to optimize the compaction parameters, especially the number of layers of widely employed compaction methods, viz, the vibratory hammer (VH) and vibratory table (VT). A field slab was constructed using a duplex roller to provide a target value for the optimization process. Parameters such as packing density, fresh density, mechanical properties, viz, compressive, split tensile, and flexural strength, and porosity were considered for the tailoring process. Fresh density results showed that VT and VH-compacted specimens with ASTM parameters were loosely (−1.1%) and densely compacted (+5%), respectively, compared with field specimens (FSs). Therefore, to determine the optimal compaction parameters, the number of layers increased to five in the VT method and decreased to one in the VH method. Among different compaction layers, only the specimen fabricated with four layers and one layer in the VT and VH methods, respectively, could closely resemble the fresh, mechanical, and porosity of FSs. In addition, a new compaction procedure for fabricating prismatic specimens is developed for the VH and VT methods based on the compaction energy and packing density approaches.

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“…The shear strength parameters of CSGR dams may refer to: A roller compacted dam (RCD) (Park et al 2007) go; A lean RCC dam (Gouvas & Orfanos 2014); A grout-enriched vibratable RCC dam (GEVR); and a medium mortar RCC dam (Asmida et al 2017;Shi & Fang 2006). The RCD method was developed in Japan (Schrader 1977) and mainly follows the column method of a conventionally vibrated concrete (CVC) dam, including construction joint curing, surface roughening, cleaning and paving mortar. The amount of cement is about 120 kg/ m 3 for 1 m 3 with inter-laminar shear cohesive forces of 2.5-3.0 MPa.…”

Section: Introductionmentioning

confidence: 99%