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Effect of partial replacement with thermally processed sugar cane bagasse on the properties of mortars

2017; UNIVERSIDADE FEDERAL DO RIO DE JANEIRO; Volume: 22; Issue: 1 Linguagem: Inglês

10.1590/s1517-707620170001.0117

1517-7076

Augusto César da Silva Bezerra, Sérgio Luis Costa Saraiva, Luis Felipe dos Santos Lara, Laurenn Wolochate Aracema de Castro, Romero César Gomes, Conrado de Souza Rodrigues, Maria Cecília Ferreira, Maria Teresa Paulino Aguilar,

Recycling and utilization of industrial and municipal waste in materials production

Sugar cane bagasse is a residue of the sugar-alcohol industry, and its main destination is represented by burning boilers for power generation. The bagasse cogeneration of power produces a sugar cane bagasse ash (SCBA) residue that does not have a useful destination. Ashes are commonly studied as pozzolan in Portland cement production. International Standards indicate the use of pozzolan with up to 50% substitution. In the present work, we investigate the use of SCBA as an addition in Portland cement. For this purpose, Portland cement was prepared by substituting cement with 0, 10, 20, and 30% processed SCBA in volume. The ashes were processed by re-burning and grinding and were then characterized by scanning electron microscopy, X-ray diffraction, laser granulometry, X-ray fluorescence spectrometry, the Chapelle method, and pozollanic activity. To evaluate the cement with substitution, we used the mortar recommended by NBR 7215. The mechanical properties of the cements with replacement were analysed through tests of the compressive strength and flexural strength of mortars. The results appear interesting and support the possible use of SCBA in the production of cement from the aspect of mechanical properties evaluated.