Circle the cоrrect chоice оr fill in the blаnks (2 points eаch unless otherwise mentioned): 1) Nаme the gradation parameters that are needed in assessing the compactibility of a coarse aggregate for a drainable base. ________________ ________________ 2) Which granular material property is directly used in drainage design? a. Void ratio b. Porosity c. Effective porosity d. Soil solid specific gravity 3) Which of the following affects the permeability coefficient of a given drainable base most? a. maximum aggregate size b. Size corresponding to 85% passing c. Size corresponding to 15% passing d. Both (b) & (c) 4) Name TWO essential layer components of an edge drainage system with a drainable base. a.______________ b.______________ 5) (1) A chemically modified subgrade should not be a separator layer. (i) Yes (ii) No 6) (1) A vibratory roller can compact an asphalt-treated drainable base. (i) True (ii) False 7) (1) The Portland cement-bound drainable base layer must be constructed using equipment different from that used for PCC paving. (i) True (ii) False 8) (1) The Portland cement-bound drainable base layer material can be obtained from a ready-mix plant. (i) True (ii) False 9) (1) The asphalt mixture for an asphalt-treated drainable base layer can be produced in a conventional asphalt plant. (i) True (ii) False 10) (1) An asphalt-treated drainable base layer can be constructed using a conventional hot-mix asphalt paver. (i) True (ii) False 11) The Present Serviceability Index (PSI), developed during the AASHO Road Test, is most closely related to the following objective measurement on the pavements? i) Cracking ii) Rutting/Transverse Profile iii) Patching iv) Longitudinal Profile 12) (1) Can the performance period be greater than the analysis period? (i) Yes (ii) No 13) (3) An asphalt pavement is being designed in three stages using the 1993 AASHTO Design Guide for a 30-year design period. If the reliability of each stage is 95%, then the overall reliability will be: i) 70% ii) 80% iii) 86% iv) 95% 14) According to the 1993 AASHTO Design Guide, from a cost-effective viewpoint, if the ratio of costs for hot-mix asphalt (HMA) and the granular base is less than the corresponding ratio of layer coefficients times the drainage coefficient, then the most economical design is to use: i) Minimum base thickness ii) Minimum HMA thickness iii) No base iv) No feasible design 15) (3) Draw the serviceability-time curves for a 2-stage PCC pavement design over the analysis period following the 1993 AASHTO Design Guide. 16) In concrete pavements, which of the following produces the most stress? i) Contraction and expansion ii) Curling and Warping iii) Applied traffic load iv) Volume change of subgrade due to swelling soil 17) (1) Can stress due to No. (iv) in Q. 16 be quantified mechanistically? i) Yes ii) No 18) Curling stress may be added to or subtracted from loading stresses to obtain the combined stresses for concrete pavements. If the design is governed by the edge stress, during the night time, curling stress should be i) Added to the loading stresses ii) Subtracted from the loading stresses iii) Either (i) or (ii) iv) Ignored 19) Which of the following mechanistic responses is used in dowel design? i) Shear stress ii) Bending stress iii) Dowel deflection at the concrete-dowel interface iv) Corner deflection 20) The “rule of thumb” for dowel diameter in inches is i) Thickness (in)/6 ii) Thickness (in)/8 iii) Thickness (in)/10 iv) Thickness (in)/12 21) The transverse joints are used to control cracking due to i) Shrinkage ii) Contraction and Expansion iii) Both (i) & (ii) iv) Curing & warping 22) The longitudinal joints are used to control cracking due to i) Shrinkage ii) Contraction and Expansion iii) Both (i) & (ii) iv) Curing & warping 23) To avoid mid-panel cracking, the length-to-width ratio of a JPCP slab in highway or airport pavement should not be greater than i) 1.25 ii) 1.5 iii) 1.75 iv) 2.0 24) (3) A 12-foot wide, dowelled JPCP with a slab thickness of 11 inches on a granular subbase (adjustment factor due to slab-subbase friction = 0.8) is being designed with 15-foot joint spacing and 1/4-inch joint width. If the concrete unit weight is 150 pcf and the subbase friction coefficient is 1.5, then compute the maximum tensile stress in the concrete. ______________________________ 25) (3) If the concrete for JPCP in Q. No. 24 has a coefficient of thermal expansion = 6.0 x 10 -6 in/in/deg. F, the coefficient of drying shrinkage = 1.0 x 10 -4, and experiences a thermal differential (the temperature at placement - lowest mean monthly temperature) of 100 deg. F, then compute the anticipated joint opening. __________________________________ 26) (3) Compute the minimum sealant compression if a 7/16-inch wide preformed sealant is used in Question Nos. 24 & 25's pavement. ________________________ 27) If a 7/16-inch wide preformed sealant is used in Question Nos. 24 & 25's pavement, then compute the maximum sealant compression. _________________________ 28) (1) All JPCP contraction joints in Kansas are dowelled. i) Yes ii) No. 29) (1) All PCCP contraction joints in airport pavements are dowelled. i) Yes ii) No.
Chаpter 6: List the fаctоrs shоuld teаchers cоnsider when they match students to text? Why are these important?