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ACI 209.1R-05: Report on Factors Affecting Shrinkage and by ACI

By ACI

This advisor describes the results of various variables on shrinkage and creep of hardened concrete, together with mix proportions, setting, layout, and building. This record is geared toward designers who desire to achieve additional information regarding components altering shrinkage and creep yet doesn't comprise info at the prediction of shrinkage and creep or structural layout matters linked to shrinkage and creep.

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4. Temperature dependence of the effective density-of-states mass md* , e for electrons in 4H/6H–SiC (calculated after [97S, 97W]). 35 0 200 400 600 Temperature T [K] 800 1000 Fig. 5. Al ionization energy ∆E(Al) as a function of the Al concentration N(Al) for different degrees of compensation K. The symbols are experimental data, the solid/dashed curves are calculated after [80S]; (taken from [96S]). 5 16 10 17 18 19 10 10 10–3 Concentration NAl [cm ] 20 10 21 10 Fig. 6. Degree of ionization I = (NA− – Ncomp)/(NA – Ncomp) as a function of the temperature for Al and B acceptors in SiC.

IR absorption spectra of a nitrogen-doped 3C–SiC sample taken at T = 7K and T = 80K. 9meV [96P2]. 16 3C-SiC : N 14 T=7K 12 2p0 314 Transmittance T [%] 10 381 2p± 354 404 415 8 T = 80 K 247 6 411 420 4p± 5p± 4 286 2 0 200 399 3p± 240 280 320 360 –1 Wave number ν [cm ] 400 440 480 500 Fig. 2. Hall scattering factor rH,e vs. 741T. The net doping concentration ND–NA of samples A to E varies from 7x1015cm–3 to 8x1016cm–3 [98R]. 90 40 50 60 70 80 100 Temperature T [K] 200 300 Fig. 3. Temperature dependence of the degeneracy factor gi for N donors at hexagonal and cubic lattice sites incorporated in the 4H, 6H and 15R polytype.

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