Abstract
The contact electrical resistivity of the steel-cement interface was found to correlate strongly with the shear bond strength, so that it provides a non-destructive method of bond strength assessment. For as-received and acetone washed stainless steel fibers, the contact resistivity increased linearly with increasing bond strength, because interfacial phase(s) of volume resistivity higher than that of cement paste enhanced the bonding. For acid washed stainless steel fibers, the contact resistivity was lower, increased with decreasing bond strength, and increased during debonding, all due to the effect of interfacial voids; thus contact resistivity provided an indication of the progress of debonding. Acetone washing increased the bond strength, decreased the contact resistivity, and caused the contact resistivity to correlate linearly with the bond strength more strongly, due to its cleansing action. The bond strength decreased and the contact resistivity increased with increasing curing age from 1 to 28 days for as-received and acetone washed stainless steel fibers, due to interfacial void content increase.
| Original language | English |
|---|---|
| Pages (from-to) | 203-208 |
| Number of pages | 6 |
| Journal | ACI Materials Journal |
| Volume | 94 |
| Issue number | 3 |
| State | Published - May 1997 |
Keywords
- Bond strength
- Cement
- Concrete
- Contact electrical resistivity
- Curing age
- Stainless steel fiber
- Surface treatment
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