Strength Properties of Processed Fly Ash Concrete

Abstract

Abstract. The present paper reports on the mechanical treatment of fly ash for improving the delayed reactivity of fly ash with the hydration product of cement. Grinding of fly ash was carried out in a ball mill for different time durations and processing time was optimized for maximum fineness. Concrete mixes were prepared using various proportions of processed and unprocessed fly ash replacement in cement (25% and 50%). The influence of steel fiber addition on the mechanical properties of the concrete was studied for different curing periods. The test results on pozzolanic activity and lime reactivity indicate that the processed fly ash exhibited a higher strength gain than the unprocessed fly ash, with a maximum increase in compressive strength of up to 12%. Improved pozzolanic properties were noticed due to the increase in fineness of the fly ash particles.

Physical, Mechanical and Durability Properties of Ecofriendly Ternary Concrete Made with Sugar Cane Bagasse Ash and Silica Fume

“…BFS mortars exhibited greater recovery in relation to water penetration resistance compared to the reference and FA mortars [25]. Likewise, Anandan et al determined that the mechanical properties of processed fly ash based concrete with 50% OPC replacement had equal or better strength gain at later ages than unprocessed fly ash based concrete with 25% OPC replacement [26], and in another research work it was shown that binary concretes with 20% fly ash reinforced with AISI 304 Steel presented a higher corrosion resistance than AISI 1018 steel when exposed to a simulated marine environment [27]. Atis et al showed that the compressive strength of silica fume concrete cured at 65% RH was easier to influence than that of Portland cement concrete.…”

Penggunaan Fly Ash sebagai Agregat Buatan Pengganti Agregat Alami pada Campuran Beton

“…Hasil dari kuat tekan beton dengan agregat buatan berbahan fly ash dapat mencapai hingga 23,8 MPa pada umur 28 hari (Ravisankar dkk, 2015). Kekuatan agregat tergantung juga pada gradasi, tekstur permukaan, bentuk butiran dan ukuran agregat maksimum yang digunakan (Widayanti dkk, 2018) (Anandan & Manoharan, 2015). Studi lain tentang penggunaan pasta geopolimer sebagai agregat buatan yang digunakan pada campuran aspal beton menunjukan bahwa agregat geopolimer sangat berpotensi sebagai pengganti agregat alam bergantung pada kandungan alkali activator nya (Karyawan dkk, 2017).…”