Table 10.6 Loss tangent (tan ,0.002)of cement pastes.Refer to Note in Table 10.2 Formulation With as-received silica fume (Hz) With silane-treated silica fume (Hz) 0.2 1.0 2.0 0.2 1.0 2.0 A 0.082 0.030 <10-4 0.087 0.032 <10-4 4+ 0.102 0.045 <10-4 0.093 0.040 <10-4 A 0.089 0.033 <10-4 0.084 0.034 <104 0.085 0.043 <10-4 0.084 0.032 <104 AK 0.079 0.039 <10-4 0.086 0.035 <10-4 AS 0.076 0.036 <10-4 0.083 0.033 <10-4 Table 10.7 Storage modulus(GPa,+0.03)of cement pastes.Refer to Note in Table 10.2 Formulation With as-received silica fume (Hz) With silane-treated silica fume (Hz) 0.2 1.0 2.0z 0.2 1.0 2.0 A 12.71 12.14 11.93 16.75 16.21 15.95 + 11.52 10.61 10.27 15.11 14.73 14.24 A+F 13.26 13.75 13.83 17.44 17.92 18.23 AO 14.14 14.46 14.72 18.92 19.36 19.57 AK 15.42 16.15 16.53 19.33 19.85 20.23 A+S 17.24 17.67 15.95 21.34 21.65 21.97 Table 10.8 Drying shrinkage strain(104,+0.015)different curing ages Formulation With as-received silica fume (days) With silane-treated silica fume(days) 1 4 8 19 4 8 19 B 1.128 3.021 3.722 4.365 1.013 2.879 3.623 4.146 BF 0.832 2.417 3.045 3.412 0.775 2.246 2.810 3.113 BO 0.825 2.355 3.022 3.373 0.764 2.235 2.793 3.014 BK 0.819 2.321 3.019 3.372 0.763 2.232 2.790 3.010 BS 0.812 2.316 2.976 3.220 0.752 2.118 2.724 2.954 Notes B:cement waterwater reducing agent silica fume methylcellulose defoamer. BF:B+as-received fibers BO:B+O:-treated fibers. BK:B+dichromate-treated fibers. BS:B+silane-treated fibers. Further addition of carbon fibers decreases the loss tangent.The loss tangent decreases in the following order:as-received fibers,ozone-treated fibers,dichromate-treated fibers and silane-treated fibers,at least for the case of as-received silica fume at 0.2 Hz.The storage modulus(Table 10.7)is decreased by the addition of methylcellulose.Further addi- tion of carbon fibers increases the storage modulus,such that the modulus increases in the ©2003 Taylor&FrancisTable 10.6 Loss tangent (tan , 0.002) of cement pastes. Refer to Note in Table 10.2 Formulation With as-received silica fume (Hz) With silane-treated silica fume (Hz) 0.2 1.0 2.0 0.2 1.0 2.0 A 0.082 0.030 104 0.087 0.032 104 A 0.102 0.045 104 0.093 0.040 104 AF 0.089 0.033 104 0.084 0.034 104 AO 0.085 0.043 104 0.084 0.032 104 AK 0.079 0.039 104 0.086 0.035 104 AS 0.076 0.036 104 0.083 0.033 104 Table 10.7 Storage modulus (GPa, 0.03) of cement pastes. Refer to Note in Table 10.2 Formulation With as-received silica fume (Hz) With silane-treated silica fume (Hz) 0.2 1.0 2.0 z 0.2 1.0 2.0 A 12.71 12.14 11.93 16.75 16.21 15.95 A 11.52 10.61 10.27 15.11 14.73 14.24 AF 13.26 13.75 13.83 17.44 17.92 18.23 AO 14.14 14.46 14.72 18.92 19.36 19.57 AK 15.42 16.15 16.53 19.33 19.85 20.23 AS 17.24 17.67 15.95 21.34 21.65 21.97 Table 10.8 Drying shrinkage strain (104 , 0.015) different curing ages Formulation With as-received silica fume (days) With silane-treated silica fume (days) 1 4 8 19 1 4 8 19 B 1.128 3.021 3.722 4.365 1.013 2.879 3.623 4.146 BF 0.832 2.417 3.045 3.412 0.775 2.246 2.810 3.113 BO 0.825 2.355 3.022 3.373 0.764 2.235 2.793 3.014 BK 0.819 2.321 3.019 3.372 0.763 2.232 2.790 3.010 BS 0.812 2.316 2.976 3.220 0.752 2.118 2.724 2.954 Notes B: cement water water reducing agent silica fume methylcellulose defoamer. BF: B as-received fibers. BO: B O3-treated fibers. BK: B dichromate-treated fibers. BS: B silane-treated fibers. Further addition of carbon fibers decreases the loss tangent. The loss tangent decreases in the following order: as-received fibers, ozone-treated fibers, dichromate-treated fibers and silane-treated fibers, at least for the case of as-received silica fume at 0.2 Hz. The storage modulus (Table 10.7) is decreased by the addition of methylcellulose. Further addi￾tion of carbon fibers increases the storage modulus, such that the modulus increases in the © 2003 Taylor & Francis