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Book ChapterDOI

Self-compacting Concrete—Optimization of Mix Design Procedure by the Modifications of Rational Method

19 Feb 2020-pp 369-396
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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Topics: Superplasticizer (50%)
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Journal ArticleDOI
Abstract: The development of Self-compacting concrete (SCC) was initiated in Japan in late 1980. SCC is understood for its self-consolidation and flows through narrow spaces in the formwork and does not require external vibration which has enhanced its acknowledgment over normal concrete, thus increasing the interest of researchers to focus on this building and construction material. A lot of research on SCC has been done in Japan, Turkey, Iran, United Kingdom, Algeria, Thailand, Malaysia, and India. Common industrial materials such as Limestone Powder (LP), Metakaolin (MK), Fly Ash (FA), Silica Fume (SF) and Granulated Blast Furnace Slag (GBFS) have been used to increase the efficiency of SCC. There are also numerous options on recycle materials which can be utilized for the development of SCC. This paper focusses on the use of pozzolanic material like Metakaolin (MK) as a mineral admixture and non-pozzolanic material like Waste Marble Powder (WMP) as a filler material. Both types of materials have a positive effect on the fresh, hardened and durability state of SCC. The use of MK plays an important role in decreasing the environmental pollution by way of lesser carbon dioxide emissions. The use of WMP reduces the segregation, bleeding and cost of production of SCC. Therefore, this paper containing the valuable and significant information can provide a platform for the new researchers for future investigations on SCC.

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1 citations


Journal ArticleDOI
Abstract: When understanding the influence of concrete surface preparation on the effectiveness of CFRP reinforcement, the load capacity of high-performance, self-compacting, fibre-reinforced concrete (HPSCFRC) is crucial for it efficiency. In this studies, few factors that have an influence on the stress–strain characteristic of concrete confined by CFRP laminates were examined. The method of surface preparation and the number of CFRP layers were considered as crucial parameters that have a significant impact on the characteristics of the load-bearing capacity of reinforced elements. Three different concrete surfaces were examined: grinded, sanded and unprepared. The morphology of each of the concrete surfaces was clearly, and the Abbott-Firestone profile material share curve was then extensively analyzed. During this research, 40 cylindrical concrete specimens were wrapped with one, two and three layers of CFRP, and then subjected to a uniaxial compressive test. The obtained results showed that the morphology of the concrete surface has a real impact on the load-bearing capacity of HPSCFRCreinforced with CFRP. Furthermore, the grinded concrete surface was characterized by the best cooperation with the composite reinforcement.

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References
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Journal ArticleDOI
Hajime Okamura1, Masahiro Ouchi1Institutions (1)
Abstract: Development of Self-Compacting Concrete For several years beginning in 1983, the problem of the durability of concrete structures was a major topic of interest in Japan. The creation of durable concrete structures requires adequate compaction by skilled workers. However, the gradual reduction in the number of skilled workers in Japan's construction industry has led to a similar reduction in the quality of construction work. One solution for the achievement of durable con- crete structures independent of the quality of construc- tion work is the employment of self-compacting con- crete, which can be compacted into every corner of a formwork, purely by means of its own weight and with- out the need for vibrating compaction (Fig. 1). The necessity of this type of concrete was proposed by Okamura in 1986. Studies to develop self-compacting concrete, including a fundamental study on the work- ability of concrete, have been carried out by Ozawa and Maekawa at the University of Tokyo (Ozawa 1989, Okamura 1993 & Maekawa 1999). The prototype of self-compacting concrete was first completed in 1988 using materials already on the mar- ket (Fig. 2). The prototype performed satisfactorily with regard to drying and hardening shrinkage, heat of hydration, denseness after hardening, and other proper- ties. This concrete was named "High Performance Con- crete" and was defined as follows at the three stages of concrete:

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1,312 citations


Journal ArticleDOI
Hajime Okamura1, Masahiro Ouchi2Institutions (2)

431 citations


Journal ArticleDOI
N Bouzoubaâ1, Mohamed Lachemi2Institutions (2)
Abstract: In recent years, self-compacting concrete (SCC) has gained wide use for placementin congested reinforced concrete structures with difficult casting conditions. Forsuch applications, the fresh concrete must possess high fluidity and goodcohesiveness. The use of fine materials such as fly ash can ensure the requiredconcrete properties. The initial results of an experimental program aimed atproducing and evaluating SCC made with high-volumes of fly ash are presented anddiscussed. Nine SCC mixtures and one control concrete were investigated in thisstudy. The content of the cementitious materials was maintained constant (400kg/m 3 ), while the water/ cementitious material ratios ranged from 0.35 to 0.45. Theself-compacting mixtures had a cement re placement of 40, 50, and 60% by Class Ffly ash. Tests were carried out on all mixtures to obtain the properties of freshconcrete in terms of viscosity and stability . The mechanical properties of hardenedconcretes such as compressive strength a nd drying shrinkage were also determined.The self-compacting concretes develope d a 28-day compressive strengths rangingfrom 26 to 48 MPa. The results show th at an economical self-compacting concretecould be successfully developed by incor porating high-volumes of Class F fly ash.

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393 citations


Journal Article
Abstract: 1. Characteristics Self-compacting high-performance concrete is a high performance concrete that can be compacted into every corner of a formwork, purely by means of its own weight and without the need for vibrating compaction (Fig. 1). This concrete is defined as follows at the three stages of concrete: (1) Fresh: selfcompactable; (2) Early age: avoidance of initial defects; (3) After hardening: protection against external factors.

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330 citations


01 Jan 1999-
Abstract: Self-compacting concrete was first developed in 1988 in order to achieve durable concrete structures. Since then, various investigations have been carried out and the concrete has been used in practical structures in Japan, mainly by large construction companies. Investigations for establishing a rational mix-design method and self-compactability testing methods have been carried out from the viewpoint of making it a standard concrete. Recommendations and manuals for self-compacting concrete were also established.

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271 citations


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