Issue 59

M. A. R. Elmahdy et alii, Frattura ed Integrità Strutturale, 59 (2022) 486-513; DOI: 10.3221/IGF-ESIS.59.32

for self-healing mortar is curing. The specimens were demolded after one day from casting and started curing in tap water until 7, 28, 56, and 90 days for the compressive strength test and 28 and 56 days for the bending strength test.

Bacteria concentration (CFU/ml)

Mix Bacteria type

Bacteria /cement

Nutrient type

Nutrient /cement

M0 M1 M2

-

-

0.0%

-

-

BM BM

2× 10 8 2× 10 9 2× 10 8 2× 10 9 2× 10 8 2× 10 9 2× 10 8 2× 10 9 2× 10 9 2× 10 9

0.25% 0.25% 0.25% 0.25%

Ca La Ca La Ca La Ca La Ca La Ca La Ca La Ca La Ca As Ca As

0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%

M3 EMCC M4 EMCC

2.5% 2.5% 2.5% 2.5%

M5 M6

BM BM

M7 EMCC M8 EMCC M9 EMCC M10 BM M11 FP M12 FP M13 FP M14 FP

0.25% 0.25% 0.25%

- - - -

- - - -

- - - -

0.5% 2.5%

5%

Table 8: The mortar mixes proportions.

Silica fume (kg/m 3 )

Super Plasticizer (kg/m 3 )

Mix Cement (kg/m 3 )

Bacteria (kg/m 3 )

Water (kg/m 3 )

Nutrient (kg/m 3 )

Sand (kg/m 3 ) 1402.9 1398.4 1398.4 1398.4 1398.4 1387.5 1387.5 1387.5 1387.5 1398.4 1398.4 1401.7 1400.4 1390.7 1378.7

M0 M1 M2 M3 M4 M5 M6 M7 M8 M9

701.4 699.2 699.2 699.2 699.2 693.7 693.7 693.7 693.7 699.2

0.0 1.7 1.7 1.7 1.7

257.8 257.0 257.0 257.0 257.0 254.9 254.9 254.9 254.9 257.0 257.0 257.6 257.3 255.5 253.3

0.0 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 0.0 0.0 0.0 0.0

35.1 35.0 35.0 35.0 35.0 34.7 34.7 34.7 34.7 35.0 35.0 35.0 35.0 34.8 34.5

3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5

17.3 17.3 17.3 17.3

1.7 1.7 1.8 3.5

M10 699.2 M11 700.8 M12 700.2 M13 695.3 M14 689.4

17.4 34.5

Table 9: The components of the mixes by weight.

491