Research Article
Experimental Evaluation of Bond Strength between Setting Retarder Added Concrete and Normal Concrete
Table 3
Summary of test result on the 28th day.
| | Specimen code | Roughness | Setting retarder (%) | (kN) | (mm) | Failure mode |
| | R_N_8 | — | 1 | 268.0 | 8.7 | Compressive failure | | R_N_16 | — | 1 | 228.6 | 6.3 | Compressive failure | | R_N_24 | — | 1 | 189.0 | 5.9 | Compressive failure | | R_N_72 | — | 1 | 152.7 | 5.7 | Bond failure | | R_B_8 | Brushing | 1 | 333.5 | 8.3 | Compressive failure | | R_B_16 | Brushing | 1 | 348.5 | 8.8 | Compressive failure | | R_B_24 | Brushing | 1 | 216.5 | 9.0 | Compressive failure | | R_B_72 | Brushing | 1 | 175.9 | 5.7 | Bond failure | | N_N_8 | — | | 238.9 | 7.4 | Compressive failure | | N_N_16 | — | | 180.4 | 5.7 | Bond failure | | N_C_16 | Chipping | | 146.8 | 5.1 | Bond failure |
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, maximum load; maximum displacement. |
