An investigation of concrete pipes under loading

Rababh Mahmoud, Elgarhi, Ibrahim

  Cite As : 

Rababh M,  Elgarhi, I ."  An investigation of concrete pipes under loading ",Allerton.Press, Vol,50, No1, pp1088-1097( 2019)
 

  Three-edge-bearing and crack size measurement tests, along with tension testing, were performed on concrete pipes of 500 mm diameter, which included plain concrete, reinforced concrete, and steel-fibre concrete variants. The experimental procedure included a specific test on an elliptical reinforced concrete pipe subjected to tension. Various simulation models were used to validate these experimental findings. The data showed that the steel-fibre concrete pipes, incorporating RC80/60-BN type steel fibres at a dosage of 25 kg/m^3, exhibited a three-edge-bearing strength that was 82% higher than that of plain concrete pipes and 6% higher than that of reinforced-concrete pipes. Moreover, the average crack size in the steel-fibre pipes was found to be 47% smaller than that of plain concrete pipes and 15% smaller compared to reinforced-concrete pipes. Further examination of steel-fibre concrete pipes with a steel fibre dosage of 40 kg/m^3 indicated that a 60% increase in fibre content led to only marginal enhancements, implying that a fibre dosage of 25 kg/m^3 may be close to the optimum. Overall, the tests validate that steel-fibre concrete pipes are more cost-effective and possess enhanced mechanical and physical attributes relative to reinforced-concrete pipes.