Use of wastes of the sugar industry as pozzolana in lime-pozzolana binders: Study of the reaction
- Univ. Central de las Villas, Santa Clara (Cuba)
- Univ. of Kassel (Germany). Dept. of Structural Materials
Mineralogical studies of different wastes of the sugar industry, mainly sugar cane bagasse ash and sugar cane straw ash, have shown that such by-products are likely to be pozzolanic. Their use in lime-pozzolana binders could become an interesting alternative for developing countries. This paper presents a study that was aimed at monitoring the reaction between lime and wastes of the sugar industry having pozzolanic properties by evaluating (1) content of calcium hydroxide, dependent on time; (2) development of the pore structure, dependent on time; (3) study on the reaction products at different stages; and (4) mechanical properties of hardened pastes. The presence of calcium hydroxide was confirmed by x-ray diffraction analysis and thermogravimetric analysis of powder from samples of hydrated lime-pozzolana pastes. The reaction products in hydrated pastes were observed in a scanning electron microscope, and the pore structure was assessed using a mercury intrusion porosimeter. The results of the study show that sugar cane bagasse ash does not act like a reactive pozzolana, mainly due to the presence of unburned material and carbon, whereas sugar cane straw ash shows good pozzolanic activity comparable to that of rice husk ash.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 323693
- Journal Information:
- Cement and Concrete Research, Vol. 28, Issue 11; Other Information: PBD: Nov 1998
- Country of Publication:
- United States
- Language:
- English
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