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Majumdar D.,Jadavpur University | Saraswati S.,Jadavpur University | Biswas P.P.,Jadavpur University | Chowdhury S.,Research and Development for Aditya Birla Group | Chowdhury S.,Indian Institute of Technology Kharagpur
Indian Concrete Journal | Year: 2013

This paper describes the development of a relationship based on Strength - Cementitious Material and Water for proportioning Portland slag cement based concrete. It involves strength index (fc/fm) or the ratio of compressive strength of concrete (fc) and compressive strength of the mortar (fm) and water cementitious material ratio (w/c m) and uses mortar proportioned with PSC and fine aggregates for further proportioning the concrete mix. The relationship incorporates the hydration characteristics of PSC. The test results confirm its suitability for proportioning Portland slag cement based concrete. Source


Chowdhury S.,Research and Development for Aditya Birla Group | Kaushik S.K.,Indian Institute of Technology Roorkee
Indian Concrete Journal | Year: 2012

This paper reports an experimental investigation carried out to evaluate the influence of paste volume on the rheological properties of mortar. Ordinary portland cement (OPC), fly ash (FA) as mineral admixture, river sand (S1) and crushed stone sand (S2) as fine aggregate were the main constituents. A number of mixtures were prepared with identical paste volume, water to powder (OPC + fly ash) ratio, proportion of powder and fine aggregate as well as similar mixing protocol for each group of mortar mixes. The spread flow diameter and funnel flow out time of each mortar mix was tested to evaluate the rheological characteristics. The study shows a close link between paste volume and rheological behaviour of mortar. The results suggest that flowability of the mortar increases and viscosity decreases with the higher volume of paste in a mortar. Source


Chowdhury S.,Research and Development for Aditya Birla Group | Kadam S.,Research and Development for Aditya Birla Group | Keskar S.,Research and Development for Aditya Birla Group
Indian Concrete Journal | Year: 2011

This paper investigates the effect of fine aggregate size on rheology and compressive strength of an SCC mortar. Three specimens of fine aggregates having different size fractions were used. The mortar powder composed of an ordinary Portland cement (OPC) and fly ash (FA). A number of mixes using identical powder to fine aggregate proportion at 0.3 water powder ratio (w/p) were tested. The mortars' spread diameter and funnel flow out time and cubes' compressive strength indicated that the fine aggregate size influences the rheological properties of mortar but not the compressive strength. Regardless of the fine aggregate size, the mixes with higher levels of fly ash (as OPC replacement) enhanced the flowability more than those with lower dosage of fly ash did. Source

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