Effects of sugar cane bagasse ash as a cement replacement on properties of mortars

Abstract

Sugar cane bagasse ash (SCBA), a by-product of sugar and alcohol production, is one of the potential pozzolanic material that can be blended with Portland cement. In this study, SCBA with particle sizes < 45 μ m was used to replace type I ordinary Portland cement with various dosages (10 % , 20 % , and 30 % ) by weight of binder. The water/cementitious material (w/cm) and sand/binder ratios were kept at constants of 0.55 and 2.75, respectively. Composites were mixed, and effects of SCBA on properties were investigated by conducting flow test, water absorption test, initial surface absorption test, drying shrinkage test, compressive strength test, rapid chloride penetration test (RCPT), thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM). Experimental results show that the flow spread of fresh mortars would decrease with an increase of SCBA replacement. The specimens with 10 % SCBA have the superior performance on compressive strength, drying shrinkage, water absorption, initial surface absorption, and chloride ion penetration, TGA, and SEM at the age of 56 days. It indicates that 10 % cement replacement of SCBA may be considered as the optimum limit.

Plant biomass ashes in cement-based building materials. Feasibility as eco-efficient structural mortars and grouts

“…However, for mixes with SCBA and WPSA, the drying shrinkage values are lower than that of the control mix [111,112]. Mixes with 10% of SCBA, at 25-day, show a drying shrinkage of 8%, as low as that of OPC specimens.…”

“…Mixes with 10% of SCBA, at 25-day, show a drying shrinkage of 8%, as low as that of OPC specimens. Thus, from the drying shrinkage point of view, 10 % of SCBA is found to be the optimal limit [111].…”

“…Another key factor is the porous volume created in the mixture. In the SCBA mortar, the higher porous texture increases the water demand [111].…”

“…As shown in Figure 16, for biomass compounds BLA, OBFA, ABA, WSA, WPSA AND CSA no data have been found. However, it is known that chloride permeability is reduced by < 20 % replacement of cement with SCBA [111], being 10% the optimal limit based on the results of resistance chloride penetration. In contrast, García and Sousa-Coutinho [104] concluded that the WWA does not improve the chloride penetration.…”

Treated Coconut Coir Pith as Component of Cementitious Materials

“…Zhang et al [14] studied the effect of a wheat husk ash, and they reported improvement of workability and compressive strength of concrete mixtures. Possibilities of utilization of a bagasse ash as SCM were studied by Chi [15] and also by Ganesan et al [16]. According to Ganesan et al, the best solution was found in 20% replacement, while Chi reported 10% as the best ratio of cement replacement.…”