Assessment of Sudanese Bagasse and Cotton-Stalks Ashes as Pozzolanic Materials

Mohamed E. A. Abdalla, Yousif H. Ahmed


This research investigated Sudanese agro wastes ashes (SAWAs) and assessed them as pozzolans to replace cements. This study concentrated on both local agricultural waste “sugar cane bagasse ash (SCBA) and cotton stalk ash (COSA). The paradigm for investigations was the scope of testing properties as per ASTM C311-02 and relevant specifications as per ASTM C618-99. The investigated SAWAs specimens included top and bottom furnaces SCBA from Sudanese Sugar factories and COSA from Gezeera Scheme.  Then several tests were carried out on the raw as-received or processed SAWAs as well as on 80%Portland cement (OPC):20%SAWAs mortars as per ASTM C311. The raw SAWAs were assessed for moisture content, specific gravity, fineness and chemical analysis. The mortars containing 80%OPC+20%SAWA binders (by weight percentage) with varying Water/Binder(W/B) ratio and Graded Standard sand/ binder ratio of 2.75 were investigated for mortar flow & water requirement, strength activity indexes’ (SAIs) and drying shrinkage of mortar bars.  Their results were compared with a reference mortar containing only OPC.  The results of tests were judged with criteria specified in the ASTM C618. Results of the tests for all SAWAs indicated that SCBAs are effective pozzolanic materials and the performance of the Top furnace SCBAs are superior to the Bottom SCBA. The COSA have shown no pozzolanic reactivity.

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