A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Permeability of Gap-Grades Versus Continuously-Graded Concrete
The work presents the results of a pilot study conducted to compare the permeability of gap-graded and continuously-graded concretes. The permeability tests were performed by forcing water through concrete specimens of 5 3/4-in. long by 6-in. in diameter under a pressure of 400 psi and by measuring the rate of percolation. The permeability coefficients are obtained for gap-graded and continuously-graded concretes having the same maximum size of coarse aggregate, identical cement content, and approximately equal workability. The test results indicate that coefficient-of-permeability values range from 0 to 0.000033 for both gap-graded and continuously-graded concretes. They are therefore essentially impermeable as compared with an average value of 0.0015 for good quality concrete. However, the comparison of the inflow-time curves indicated that gap-graded concrete appears less permeable than continuously-graded concrete for equal cement content and maximum size of coarse aggregate. The gap-graded concrete had slightly less water-cement ratio and higher compressive strength. (Author)
Permeability of Gap-Grades Versus Continuously-Graded Concrete
The work presents the results of a pilot study conducted to compare the permeability of gap-graded and continuously-graded concretes. The permeability tests were performed by forcing water through concrete specimens of 5 3/4-in. long by 6-in. in diameter under a pressure of 400 psi and by measuring the rate of percolation. The permeability coefficients are obtained for gap-graded and continuously-graded concretes having the same maximum size of coarse aggregate, identical cement content, and approximately equal workability. The test results indicate that coefficient-of-permeability values range from 0 to 0.000033 for both gap-graded and continuously-graded concretes. They are therefore essentially impermeable as compared with an average value of 0.0015 for good quality concrete. However, the comparison of the inflow-time curves indicated that gap-graded concrete appears less permeable than continuously-graded concrete for equal cement content and maximum size of coarse aggregate. The gap-graded concrete had slightly less water-cement ratio and higher compressive strength. (Author)
Permeability of Gap-Grades Versus Continuously-Graded Concrete
S. T. Li (author) / V. Ramakrishnan (author)
1970
20 pages
Report
No indication
English