Study on Workability of Extremely Stiff Consistency Concrete Using Some Kinds of Admixtures

Fujiwara, Hiromi; Maruoka, Masanori; Shimoyama, Yoshihide; Obatake, Akira; Kokubu, Katuro

doi:10.2208/jscej.2002.697_39

Cited by 1 publication

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Fujiwara et al (2002), when the cement of roller-compacted concrete dam (RCD) concrete is replaced with FA up to about 30%, the amount of restrained water decreases due to the bearing effect caused by the particle shape being close to a perfect circle. Consequently, the VC time drops and it becomes easier to compact RCD concrete.…”

Section: Workability Marginmentioning

confidence: 99%

Study on Mix Proportion Design Procedure for Super-high Cementitious RCC with Stone Powder Replacement

Aosaka

Tsutsui²,

Miki

2023

ACT

View full text Add to dashboard Cite

Super-high cementitious roller-compacted concrete (SHCRCC) that have unit cementitious materials content of 220 kg/m 3 or higher can be recognized as "construction friendly RCC". In this study, the proposition of how to reduce construction costs without sacrificing the workability was investigated. To solve the issue, mix proportions replacing the high volume of cementitious materials, cement, and fly ash with stone powder (SP) were surveyed. Based on exhaustive investigations, it was found that the mix proportion can be realized with sufficient tolerance of workability. In the proposed mix proportion, the cementitious materials replaced with SP up to about 100 kg/m 3 provide a large paste volume of 240 to 260 L/m 3 . In addition, it was verified that the SP plays a sufficient role as an alternative to cementitious materials since the compressive and tensile strengths of the RCC, and the watertightness and bond strength at lift joints are the same as, if not better than high cementitious RCC (HCRCC). Reducing cementitious materials also helps to control the temperature rise of the RCC. In the case of a large-scale RCC dam of 150 m in height and 2 million m 3 volume with 5 zones, it is found that a cost reduction is about 25 to 30% for cementitious materials and chemical admixture, and a placement speed is about 20% faster than that of medium cementitious RCC (MCRCC) thanks to a large workability margin.

show abstract

Section: Workability Marginmentioning

confidence: 99%