Figure 2: Strength development of a Normal concrete and Bacterial concrete In bacterial concrete, as it gains strength, hardness increases and as a result, the rebound hammer values are more because of greater elastic rebound. In order to assess particle continuity inside the concrete specimen, USPV test is recommended. Table 5: Ultrasonic pulse velocity test results of various grades of normal and bacterial concretes M20 M40 M60 M80 Age of Type of Quality Quality Quality Quality Concrete Concrete Velocity of Velocity of Velocity of Velocity of (in days) Concrete Concrete Concrete Concrete 28 3.26 medium 4.39 Good 4.89 Excellent 5.13 Excellent Normal 60 3.36 medium 4.43 Good 4.92 Excellent 5.19 Excellent Concrete 90 3.41 medium 4.50 Good 4.99 Excellent 5.33 Excellent 28 4.27 Good 4.73 Excellent 5.22 Excellent 5.94 Excellent Bacterial 60 4.33 Good 4.89 Excellent 5.36 Excellent 6.02 Excellent Concrete 90 4.39 Good 4.92 Excellent 5.41 Excellent 6.05 Excellent Table 6: Rebound hammer test results of various grades of normal and bacterial concrete specimens M20 M40 M60 M80 Age of Type of Average Quality Average Quality Average Quality Average Quality Concrete Concrete Rebound of Rebound of Rebound of Rebound of (in days) Number Concrete Number Concrete Number Concrete Number Concrete Very Very Good Good Good 28 25 Fair 34 46 51 Layer Hard Hard Layer Layer Very Very Normal Good Good Good 60 28 Fair 36 49 53 Concrete Layer Hard Hard Layer Layer Very Very Good Good Good 90 29 Fair 38 51 54 Layer Hard Hard Layer Layer Bacterial Good Very Very Very 28 33 44 53 59 Concrete Layer Good Good Good
Figure 2: Strength development of a Normal concrete and Bacterial concrete In bacterial concrete, as it gains strength, hardness increases and as a result, the rebound hammer values are more because of greater elastic rebound. In order to assess particle continuity inside the concrete specimen, USPV test is recommended. Table 5: Ultrasonic pulse velocity test results of various grades of normal and bacterial concretes Type of Concrete Age of Concrete (in days) M20 M40 M60 M80 Velocity Quality of Concrete Velocity Quality of Concrete Velocity Quality of Concrete Velocity Quality of Concrete Normal Concrete 28 3.26 medium 4.39 Good 4.89 Excellent 5.13 Excellent 60 3.36 medium 4.43 Good 4.92 Excellent 5.19 Excellent 90 3.41 medium 4.50 Good 4.99 Excellent 5.33 Excellent Bacterial Concrete 28 4.27 Good 4.73 Excellent 5.22 Excellent 5.94 Excellent 60 4.33 Good 4.89 Excellent 5.36 Excellent 6.02 Excellent 90 4.39 Good 4.92 Excellent 5.41 Excellent 6.05 Excellent Table 6: Rebound hammer test results of various grades of normal and bacterial concrete specimens Type of Concrete Age of Concrete (in days) M20 M40 M60 M80 Average Rebound Number Quality of Concrete Average Rebound Number Quality of Concrete Average Rebound Number Quality of Concrete Average Rebound Number Quality of Concrete Normal Concrete 28 25 Fair 34 Good Layer 46 Very Good Hard Layer 51 Very Good Hard Layer 60 28 Fair 36 Good Layer 49 Very Good Hard Layer 53 Very Good Hard Layer 90 29 Fair 38 Good Layer 51 Very Good Hard Layer 54 Very Good Hard Layer Bacterial Concrete 28 33 Good Layer 44 Very Good 53 Very Good 59 Very Good
206807863-Repair-and-Rehabilitation-of-concrete-structures-using-biological-approach.docx