Abstract
The quest for the development of high strength and high performance concretes has increased considerably in recent times because of the demands from the construction industry. High-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. Fly ash addition proves most economical among these choices, even though addition of fly ash may lead to slower concrete hardening. However, when high strength is desired, use of silica fume is more useful. This paper proposes a mix proportions for M80 grade Self-compacting concrete (SCC) based on Nan Su mix design principles. 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 Nan Su method could produce successfully SCC of high strength. Based on Nan Su mix design method, material quantities such as powder content ( Cement + Pozzolan ), fine aggregate, coarse aggregate, water and dosages of SP and VMA, required for 1 cu.m, are evaluated for High strength grade (M80) of Self Compacting Concrete (SCC) are estimated. Final quantities, of M80 grade SCC mix, is assumed after several trial mixes on material quantities computed using Nan Su mix design method subjected to satisfaction of EFNARC flow properties.
Highlights
Self-compacting concrete (SCC) is a new kind of high performance concrete (HPC) with excellent deformability and segregation resistance
The drawbacks of Okamura’s method are that (1) it requires quality control of paste and mortar prior to SCC mixing, while many ready-mixed concrete producers do not have the necessary facilities for conducting such tests and (2) the mix design method and procedures are too complicated for practical implementation
Based on calculations from Nan Su mix design method, quantities required for 1 cu.m are evaluated for high strength grade (M80) blended Self-Compacting Concrete (SCC) made with Fly Ash (FA), Microsilica (MS)
Summary
Self-compacting concrete (SCC) is a new kind of high performance concrete (HPC) with excellent deformability and segregation resistance. The ‘‘Standardized mix design method of SCC’’ proposed by the JRMCA is a simplified version of Okamura’s method This method can be employed to produce SCC with a large amount of powder materials, and a water/binder ratio of < 0.30. Hon’s group of Mainland China has not disclosed their mix design procedures, but just offered some useful principles. They have shown that too low a paste volume impairs the passing ability of concrete, and reduces its compression strength if no vibration is used in the mixing process. The following is the mix design for high strength grade (M80) is based on Nan Su mix design method
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