18.01.2015 Views

We Energies Coal Combustion Products ... - The White House

We Energies Coal Combustion Products ... - The White House

We Energies Coal Combustion Products ... - The White House

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Table 4-21: Air Permeability Test Results <br />

Mixture No. * Fly Ash ** (%)<br />

Average Time *** (Seconds)<br />

14-day 28-day 91-day<br />

C-1 (S) 0 543 465 830<br />

C-2(S) 0 352 433 532<br />

C-3(P) 0 389 539 549<br />

P4-1(S) 18 295 558 528<br />

P4-6(P) 18 327 307 511<br />

P4-2(P) 35 165 440 632<br />

P4-3(P) 45 236 328 676<br />

P4-4(S) 55 241 173 585<br />

P4-7(P) 55 181 192 861<br />

P4-5(S) 74 --- 170 235<br />

P4-8(P) 74 --- 142 286<br />

<strong>The</strong> following classification for the air permeability of concrete is used (Cather et al. 1984)<br />

Time in Seconds for Pressure Change<br />

Interpretation<br />

1,000 Excellent<br />

* P = Primary; S= Secondary ** As a percentage of total cementitious materials, FA/(Cement + FA).<br />

*** Test data are average of five test observations.<br />

Water permeability decreased as the age of concrete specimens increased, as<br />

shown on Figures 4-14 and 4-15 and on Table 4-22. At the 14-day age,<br />

concrete resistance to water permeability was improved for mixes with up to<br />

35% fly ash when compared to the reference mixture without fly ash. <strong>The</strong><br />

18% to 45% fly ash mixtures were rated as “good.”<br />

83 <strong>We</strong> <strong>Energies</strong><br />

<strong>Coal</strong> <strong>Combustion</strong> <strong>Products</strong><br />

Utilization Handbook

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!