A.0 Test Solutions 339 17.(4%)Figure A.2 shows the effect of the latex/cement ratio on the air void content of cement paste.Curve (a)is for the case with 0.53 vol%carbon fibers. Curve(b)is for the case without fiber.Explain the features of curve(a)in terms of their scientific origin. Test Solutions Part I(32%) The correct answers are: 1.d 2.e 3.c 4.c 5.e 6.b 7.c 8.d 9.a 10.e 11.b 12.a 13.d 14.c 15.b 16.e Part Il(68%) 1.Any two of the following answers are acceptable:higher modulus;higher ther- mal conductivity;higher electrical conductivity;higher oxidation resistance. 2.[(R-46)/46]/4.5%=22 (R-46)/46=0.99 R-46=45.54 R=91.52. 3.Modulus=(0.57)(3.4GPa)+(0.43)(0.12GPa)=2.0GPa. 4.Inhibition factor =9.9%/2.8%=3.5.A.0 Test Solutions 339 17. (4%) Figure A.2 shows the effect of the latex/cement ratio on the air void content of cement paste. Curve (a) is for the case with 0.53vol% carbon fibers. Curve (b) is for the case without fiber. Explain the features of curve (a) in terms of their scientific origin. Test Solutions Part I (32%) The correct answers are: 1. d 2. e 3. c 4. c 5. e 6. b 7. c 8. d 9. a 10. e 11. b 12. a 13. d 14. c 15. b 16. e Part II (68%) 1. Any two of the following answers are acceptable: higher modulus; higher ther￾mal conductivity; higher electrical conductivity; higher oxidation resistance. 2. [(R − 46)/46]/4.5% = 22 (R − 46)/46 = 0.99 R − 46 = 45.54 R = 91.5Ω. 3. Modulus = (0.57) (3.4GPa) + (0.43) (0.12GPa) = 2.0GPa. 4. Inhibition factor = 9.9%/2.8% = 3.5