Document Type : Original Article
Authors
1
Imam Hossein Comprehensive University, faculty of civil engineering
2
imam hossein comperhensive university
Abstract
Concrete block pavements have potential applications in roads, urban thoroughfares, ports, and airports due to their ease of implementation, lack of special machinery, long service life, and simple maintenance. In recent years, due to the high costs of pavement construction and environmental considerations, the use of various recycled materials in block pavements has attracted the attention of researchers. In this study, the mechanical properties and abrasion resistance of concrete block pavements with the replacement of slag cement and molten iron slag aggregates were investigated in order to provide the most optimal mixing design. The results of this study showed that the replacement of 20% of slag cement improves the compressive, tensile, and flexural strengths by 38, 20, and 30%, respectively, but does not significantly affect the abrasion resistance; Also, by simultaneously replacing 20% of slag cement and 40% of fine slag aggregate, the mechanical properties increase by 39, 27, and 39%, respectively, and the abrasion resistance increases by 50%, which can be introduced in this study as the most optimal concrete block pavement mixing design. Also, the results of statistical analysis show that in replacing slag cement, it continues to be the optimal point up to about 20% replacement. The results of statistical analysis indicate that the replacement of cement and aggregate has a significant effect on the compressive strength of concrete blocks, such that the correlation coefficient of 0.586 and the determination coefficient of 0.643 indicate that 64% of the changes in compressive strength are due to the replacement of materials, 25% due to the replacement of cement, 18.5% due to the contribution of fine aggregate, 10% due to the contribution of coarse aggregate, 10% due to the simultaneous combination of cement and fine aggregate, and 6% due to the simultaneous combination of cement and coarse aggregate.
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