Article

A simple mix design method for self-compacting concrete

Department of Construction Engineering, National Yunlin University of Science and Technology, Touliu, Yunlin 640, Taiwan
Cement and Concrete Research (Impact Factor: 2.86). 12/2001; 31(12):1799-1807. DOI: 10.1016/S0008-8846(01)00566-X

ABSTRACT

This paper proposes a new mix design method for self-compacting concrete (SCC). First, the amount of aggregates required is determined, and the paste of binders is then filled into the voids of aggregates to ensure that the concrete thus obtained has flowability, self-compacting ability and other desired SCC properties. The amount of aggregates, binders and mixing water, as well as type and dosage of superplasticizer (SP) to be used are the major factors influencing the properties of SCC. Slump flow, V-funnel, L-flow, U-box and compressive strength tests were carried out to examine the performance of SCC, and the results indicate that the proposed method could produce successfully SCC of high quality. Compared to the method developed by the Japanese Ready-Mixed Concrete Association (JRMCA), this method is simpler, easier for implementation and less time-consuming, requires a smaller amount of binders and saves cost.

    • "Properlyproportioned and cured mixtures of super plasticized concrete, with 0.4 or less w/cm, show a little or no permeability[3]. In order to achieve the best of strength, durability and other special properties of concrete we add some percentage of admixtures, pozzolans and etc. with conventional concrete to achieve a high performance concrete to meet our special needs[4]. The terminology HPC to meet specified strength and durability requirements both shorter and long term is needed for structural and environmental purposes[5]. "

    No preview · Article · Jan 2016 · Ciência e Técnica Vitivinícola
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    • "The experimental program was designed to study the Mechanical Properties of Self Compacting Concrete made with concrete of M40 with the Replacement of Fine Aggregate (i.e., Sand)[16]for Self-Compacting Concrete (SCC). "
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    ABSTRACT: Sustainable Construction is the adoption of materials and products in buildings and construction that will require less use of natural resources and increase the reusability of such materials and products for the same or similar purpose, thereby reducing waste as well. Waste fine aggregate causes an environmental load due to disposal problem hence the use of waste fine aggregate in concrete mixtures will reduce not only the demand for natural sand but also the environmental burden. Moreover, the incorporation of waste fine aggregate will offset the production cost of concrete. Quarry dust is a kind of waste material that is generated from the stone crushing industry which is abundantly available and which has landfill disposal problems and health and environmental hazards. Foundry sand is high quality silica sand used as a moulding material by ferrous and non-ferrous metal casting industries. It can be reused several times in foundries but, after a certain period, cannot be used further and becomes waste material, referred to as waste, used or spent foundry sand (WFS, UFS or SFS). In brief the successful utilization of waste fine aggregate will turn this waste material into a valuable resource. Self Consolidating Concrete (SCC) is a highly flowable, stable concrete which flows readily into place, filling formwork without any consolidation and without undergoing any significant segregation. Fibre reinforced concrete can offer a convenient, practical and economical method 2 for overcoming micro-cracks and similar type of deficiencies. In the present work, Fiber Reinforced Self-Compacting Concrete (FRSCC) for replacements of Natural River Sand (NRS) with Quarry Rock Dust (QRD) & Used Foundry Sand (UFS) was developed independently. A relationship is developed between the tensile strength and compressive strength, flexural strength and compressive strength of SCC for replacements of NRS with QRD & UFS for M40 Grades of Concrete. The values of Compression, Split, and Flexure of SCC with and without replacements of NRS with QRD & UFS were also compared with the Indian Standard Codal Provisions. Key words: Quarry Rock Dust, Used Foundry Sand, Natural River Sand, Self Compacting Concrete, Glass Fiber, M40 Grade, Mechanical Properties.
    Full-text · Conference Paper · Dec 2015
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    • "This research was included twelve beam column connections with different percentage of reinforcement. Many other researchers studied the performance and the structural behavior of this type of concrete such as Ouchi et al. [23], Su et al. [24] and Burak [25] "
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    ABSTRACT: The cyclic behavior of RCS connection consisted of Reinforced Concrete (RC) columns and Steel (S) beams is studied in this paper. Two interior connections are investigated experimentally. The joint of the first specimen is designed according to ASCE 1994 guideline, while the second specimen has a new proposed joint detail. Self-consolidating concrete is used in both specimens. Self-consolidating concrete could improve constructability of the congested joint of RCS frames. The specimens detail include steel band plates, face bearing plates, L-shaped joint stirrups, and steel doubler plate for the panel zone. The proposed joint detail consists of additional bearing plates, which cause an increase in bearing & joint shear strength. Based on the experimental results, the behavior of both specimens was ductile and maintained their strength at high story drifts. This means that, RCS frames can be used in high seismic zones. By comparing the performance of two specimens, it is observed that using additional bearing plates, increases bearing and shear strength of the joint. Additionally, the inelastic force-deformation response of both specimens is simulated using the OpenSees software by taking into consideration the joint shear and bearing distortions. A modified method for modeling this type of connection is introduced and verified with experimental results.
    Full-text · Article · Nov 2015 · Journal of Constructional Steel Research
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