1 Introduction
2 Outline of Test for Chloride Diffusion with Cracks
2.1 Mixing Proportions and Used Materials
Grade (psi) | Gmax (mm) | W/B | S/a | W | Binder | Coarse agg. | Fine agg. | |
---|---|---|---|---|---|---|---|---|
C | FA | |||||||
6000 psi-H grade | 19 | 40 | 44.4 | 162.75 | 325.50 | 81.38 | 938.77 | 748.89 |
4000 psi-N grade | 19 | 50 | 46.7 | 162.75 | 260.64 | 64.86 | 938.77 | 822.01 |
Items types | Chemical composition (%) | Physical properties | |||||||
---|---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Ig. loss | Specific gravity (g/cm3) | Blaine (cm2/g) | |
OPC | 21.96 | 5.27 | 3.44 | 63.41 | 2.13 | 1.96 | 0.79 | 3.16 | 3214 |
FA | 55.66 | 27.76 | 7.04 | 2.70 | 1.14 | 0.49 | 4.3 | 2.19 | 3621 |
Items types | Gmax (mm) | Specific gravity (g/cm3) | Absorption (%) | F.M. |
---|---|---|---|---|
Fine aggregate | – | 2.58 | 1.01 | 2.90 |
Coarse aggregate | 25 | 2.64 | 0.82 | 6.87 |
2.2 Test Procedure
2.2.1 Compressive Strength
2.2.2 Accelerated Diffusion Coefficient Under Steady-State Condition in Cracked Concrete
3 Evaluation of Time and Crack Effect on Diffusion
3.1 Changes in Compressive Strength with Ages
3.2 Changes in Diffusion Coefficient with Various Ages and Crack Width
3.3 Quantification of the Effect of Crack Width and Age on Diffusion
Averaged crack width | Increasing ratios- H grade | Increasing ratios- N grade | ||||
---|---|---|---|---|---|---|
56 days | 180 days | 365 days | 56 days | 180 days | 365 days | |
0.05 | 1.000 | 0.616 | 0.215 | 1.000 | 0.579 | 0.267 |
0.15 | – | 0.625 | 0.260 | 0.792 | 0.626 | 0.291 |
0.25 | 1.141 | 0.630 | 0.231 | 0.736 | 0.599 | 0.283 |
0.35 | 1.514 | – | – | 1.070 | 0.800 | 0.399 |
0.45 | 1.263 | 0.773 | 0.388 | 1.897 | 0.854 | 0.352 |
0.55 | 1.946 | 0.873 | 0.432 | 1.801 | 0.945 | 0.566 |
0.65 | 1.906 | 0.778 | – | 2.049 | – | – |
0.75 | 1.846 | 0.915 | – | 2.316 | – | 0.524 |
0.85 | – | – | – | – | – | 0.695 |
0.95 | – | – | 0.633 | – | 1.464 | – |
1.05 | 2.120 | – | 0.561 | – | 1.459 | – |
1.15 | – | – | 0.670 | – | – | – |
1.25 | – | – | 1.138 | – | 1.522 | – |
1.35 | – | 2.946 | – | – | – | – |