Study on Utilization of Fly Ash Aggregates in Concrete

Abstract

In this study, the fine and coarse aggregates were completely replaced by fly ash aggregates in fly ash concrete. A mix design was done for M20 grade of concrete by IS method. Ordinary Portland cement of 43 grade was selected and fly ash aggregates were prepared by mixing fly ash with cement and water. The properties of fly ash fine aggregates and fly ash coarse aggregates were studied. The aggregate crushing value and aggregate impact value of fly ash coarse aggregates were also studied. The cement and fly ash proportions of 10:90, 12.5:87.5, 15:85, 17.5:82.5, 20:80 and 22.5:77.5 were tried with a suitable water cement ratio 0.3 to get the fly ash aggregates. The concrete cubes, cylinders and beams were cast with the fly ash aggregates obtained from the above six cement fly ash proportions. Then the compressive strength, split tensile strength and flexural strength were tested and compared with control concrete. This paper briefly presents the compressive strength development of fly ash aggregate concrete at different ages. The split tensile strength and flexural strength of all the concrete mixes were also investigated at different days of curing.

Properties of cold bonded quarry dust coarse aggregates and its use in concrete

“…and range of the ratio of the predicted to experimental data is given in Table 7. The deviation of test data reported from various laboratories [20,22,32,33] may be attributed to the variation in the properties of constitute material, speed of the pelletizer, angle of the pelletizer, moisture content and duration of pelletization.…”

“…The magnitude of the test data of properties of the artificial aggregate reported by Gesoglu et al [22], Chi et al [20] Shanmugasundaram et al [32], and Joseph and Ramamurthy [27] is predicted using the proposed model The comparison of test data Table 6 MANOVA results for two factor experiment of aggregate properties. and range of the ratio of the predicted to experimental data is given in Table 7.…”

“…Chang et al [31] prepared artificial aggregate by molding, using cement, sludge from a stone slab cutting plant and silt from an aggregate washing plant. Shanmugasundaram et al [32] prepared concrete with a strength of 20 MPa using cold bonded fly ash aggregate. The compressive strength of concrete prepared by Priyadharshini et al [21] using cold bonded fly ash aggregate was 28 MPa.…”

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

“…Because of these facts, more and more scientists have been trying to find new ways in which such ash could be used, e.g., for the development of alkali-activated materials, which are frequently named geopolymers 2,3 , but also for the production of artificial aggregates. [4][5][6][7][8][9][10][11][12][13] Artificial aggregates can be obtained simply by the crushing and grinding of industrial waste if the basic starting material is bulk waste. If, however, the basic starting material is a fine powder, such as fly ash, such aggregate can be produced by several different routes, as follows: 1) by high-temperature procedures, e.g., foaming and/or sintering at elevated temperatures of approx.…”

Samozbijajući beton s unutarnjom njegom i lakim agregatom

“…The class "F" fly ash, with a specific gravity of 2.27, as obtained from Mettur Thermal Power Plant, was used as mineral admixture. It was also used to make fly ash aggregate using the pelletisation method [23,24]. The specific gravity of fly ash aggregate and water absorption are 1.85 and 20 %, respectively (Figure1).…”