The Experimental Assessment of the Effect of Paper Waste Ash and Silica Fume on Improvement of Concrete Behavior

다국어 초록 (Multilingual Abstract)

In this research, the results of experiments achieved on some mixtures of concrete comprising silica fume and paper waste ash as a substitute to Portland cement have been presented. The Portland cement was substituted with various ratios (namely 0, 2.5, 5, 7.5 and 10 percent by weight of cement) of both silica fume and paper waste ash. In all mixtures of concrete, the ratio of cement to water was regarded to be persistent (with an amount of 0.4). The experiments’ findings demonstrate that the 28-days tensile, flexural and compressive strengths of concrete specimens of this study are more than the results obtained from the relationship given by both the American (ACI) and Concrete Code of Iran for normal concrete due to adding paper waste ash and Silica fume to some mixes, which indicates their positive effect in increasing mechanical properties. According to our findings, empirical relationships have been proposed for the relationship of indirect tensile strength and 28-days concrete’s compressive strength, flexural tensile strength and concrete’s 28-days compressive strength, compressive strength and specific weight, the estimation of elasticity modulus in regard to specific weight of mix designs, the growing movement of compressive strength of normal concretes by increase in the amount of cement. So that these equations can be useful to predict the behavior of the concrete containing the Silica fume and paper waste ash. The electrical resistance of mix with 10% paper waste ash was a little lower, compared to the witness concrete mix at all ages.

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