Self-compacting Concrete—Optimization of Mix Design Procedure by the Modifications of Rational Method
19 Feb 2020-pp 369-396
TL;DR: In this article, the optimization of mix proportion design has been determined by adopting the proposed rational mix design method or Japanese method with necessary modifications in consonance with the guidelines of EFNARC.
Abstract: Self-Compacting Concrete (SCC) is a special type of concrete recognized for placing in congested reinforced structures without any application of external vibration. Self compactibility can be determined by the properties of material constituents and the design of mix proportions. The absence of an approved code in India on mix design proportions and characteristics of material constituents to achieve compactibility in SCC has necessitated to determine a method for mix design of SCC. Though some researchers have carried out investigations to determine a proper mix design for producing SCC. In this investigation, the optimization of mix proportion design has been determined by adopting the proposed rational mix design method or Japanese method with necessary modifications in consonance with the guidelines of EFNARC. A suitable mix using the marginal aggregates was selected and numerous trial mixes (sixty-five) were carried out with the varying mix parameters like binder content, water-binder ratio, fine aggregate-coarse aggregate ratio, percentage of superplasticizer and viscosity modifying admixtures. The test results of this study are presented in this paper and a successful attempt has been made to determine the suitable mix design for producing SCC.
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TL;DR: In this article, the use of pozzolanic material like Metakaolin (MK) as a mineral admixture and non-pozzolastic material like Waste Marble Powder (WMP) as filler material.
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TL;DR: In this article, the influence of surface preparation on the effectiveness of CFRP reinforcement on the load-bearing capacity of high-performance, self-compacting, fibre-reinforced concrete (HPSCFRC) is examined.
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TL;DR: In this paper , the influence of different water to cement ratios (0.32, 0.34, and 0.36) with other consistent ratios using locally available ingredients in the SCC mixture was examined.
Abstract: The performance requirements for structural components are becoming more sophisticated and varied in recent years. Self-compacting concrete (SCC) is a highly flowable mixture that can placed without vibrations in structural elements with congested reinforcing. The development of SCC must achieve an appropriate balance between deformability and stability. Additionally, stability is influenced by the material properties and mix proportions, necessitating the development of a technique for SCC mixture design. However, techniques for mix design and testing are continually evolving. Mix design criteria primarily concern the type and quantity of constituents in the SSC mixture. The dose adjustment of the water to cement ratio is a critical property in proportioning SCC mixes. This research aims to examine the influence of different water to cement ratios (0.32, 0.34, and 0.36) with other consistent ratios using locally available ingredients in the SCC mixture. Also, in this study several fresh properties of SCC was examined in according with the European Federation of National Associations Representing for Concrete (EFNARC). Moreover, this study presents the findings and discussion of an experiment conducted to test the influence of water to cement ratios on fresh, and mechanical properties of SCC at 7, 14, 28 days of curing. The findings of the tests for fresh SCC properties in range of the standard limit. The strength properties were improved in the lower water to cement ratio. The increased in the water to cement ratio shows decreased in the strength properties. In addition, the ratio of water to cement affects the properties of the hardened material, while a higher water-to-cement percentage leads to an increase in flow, which may be attributed to the use of superplasticizer. .
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01 Jan 1997
TL;DR: In this article, the effects of each component of concrete mixture in self-compacting concrete on the fresh state were evaluated, and the authors found that high deformability is achieved mainly through the use of superplasticizers, while segregation resistance is achieved through viscosity of the mortar or paste components of the concrete.
Abstract: The self-compacting concrete, which was developed in 1988 in Japan, can be filled in a formwork without using any vibrators. It is an effective means of ensuring consistent quality in concrete structures, as the human factor in consolidation can be eliminated. This type of concrete has markedly increased deformability without segregation: high deformability is achieved mainly through the use of superplasticizers, while segregation resistance is achieved mainly through viscosity of the mortar or paste components of the concrete. The focus of this study is on experimental assessment of the effects of each component of concrete mixture in self-compacting concrete on the fresh state.
51 citations
TL;DR: In this paper, the addition of mineral admixtures, such as fly ash, in concrete is discussed, which can be used to obtain a desired strength for any specific application by using any of the accepted methods of design.
Abstract: Concrete of a desired strength for any specific application can be obtained by using any of the accepted methods of design. However, the addition of mineral admixtures, such as fly ash, in concrete...
43 citations
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