2.69Question No.4 (Answer 2 sections, with the 3rd (c) being of the them (compulsory)20%a. Determine the temperature susceptibility of asphalt binder has the following test results: Penetration at25°C = 42 dmm, and softening point, TR&B = 52°C.b. The results of asphalt cement tested are tabulated as follow; Determined PI and temperature susceptibilityTable7penetrationTestResult42Standard 46 °C @50 gm; 5 sec32R&B52Temp. CField46c. The strain-loading time relationship for mechanical model shown in the same Figure 1;1. Calculate the elastic deformation and their occurrence time.2. Calculate the delay time.3. Calculate the amount of deformation at 90 seconds after applying a load of 100 psi.05Strain( mm/mm)0.6040280Leading Timel sec)Figure 12

Step 1: Step 2: Step 3: Step 4:

Answered: 2.69 Question No.4 (Answer 2 sections,…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Questions 30 is based on the information below: An asphalt concrete mix design has the following properties. The densities of the binder and aggregate are 1.090 g/cm³ and 2.760 g/cm³, respectively. The bulk density of the entire mix is 2.220 g/cm³. The percent binder content is 6.2% (by weight). Assume no absorption. V₁= 1.0 cm³ Volume Vv Vb Vs AIR Binder Aggregate Mass Mb Ms Mt 30. As an engineer, you are asked to use this mix design for a 25 kilometer-long section of roadway where the total pavement width is 8.0 meters and the thickness is 15 centimeters. What is the (a) total volume of binder and (b) the total volume of aggregate that you would need to purchase? Also, determine the (c) total %air voids in the mix.
3) The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in dry condition, and 157 kg/m3 of free water required. The gravel available at job site has a moisture content of 0.8 % and absorption of 1.5 %, and the available sand has a moisture content of 1.1 % and absorption of 1.3 %. Determine: - the masses of gravel, sand and water per cubic meter that should be used at job site and the theoretical unit weight of the mix. - Assume that the same volume of dry coarse aggregate was replaced by dry lightweight aggregate of low bulk specific gravity (0.6 g/cm3) and M=5%, A=5%. What would be the new theoretical unit weight ?
When a sample subjected to the procedure of ASTM C40 produces a color darker than the standard color, Circular Disk No. 14 or Organic Plate No. 3 (Gardner Color Standard No. 14), the fine aggregate under test shall be considered to possibly contain injurious organic impurities. It is advisable to perform further tests before approving the fine aggregate for use in concrete. Identify that test to be performed.
1. Following data are given for designing a Portland cement concrete mix for a nonstructural sidewalk slab: • Design strength f´c= 26 MPa• Standard deviation of f´c obtained from 25 tests=1.4 MPa• Freezing and thawing and exposed to chlorides• Use air entrained concrete• Slab thickness= 300 mm• Fineness modulus of fine aggregate=2.7• Maximum aggregate size=50 mm and nominal maximum aggregate size=37.5mm• Bulk oven-dry specific gravity of coarse aggregate=2.6• Oven-dry rodded density of coarse aggregate=2002 kg/m3• Type I cement, relative density=3.1 Find the following:a) Required compressive strength b) w/c ratio c) Coarse aggregate amount (kg/m3) d) If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.
The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gp) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gab) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt con- tent of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table: Asphalt Content (P.) (% by Weight of Mix) Bulk Specific Gravity (Gmb) Corrected Stability (kN) Flow (0.25 mm) 4.0 2.360 6.3 4.5 2.378 6.7 10 5.0 2.395 5.4 12 5.5 2.405 5.1 15 6.0 2.415 4.7 22 Determine the design asphalt content using the Asphalt Institute design criteria for medium traffic (Table 9.15). Assume a design air void content of 4% when using Table 9.16.
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Concrete is required for a building foundation that is placed on a soil with high chloride content. The design calls for a minimum rebar spacing of 100 mm and a concrete cover of 75 mm. Which one of the following sizes is considered an acceptable nominal maximum size for aggregates? O A) 43 mm O B) 39 mm O9 28 mm O D) 49 mm A concrete pavement in Alberta will be exposed to freeze-thaw and de-icing salts during its service life. Which of the following exposure classes best describes the environmental conditions that the concrete will be exposed to? OA F-2 O B) A-2 O D) S-2 Strength of the normal weight concrete depends mainly on: OA) Strength of the aggregate O B) Mixing time OC) Purity of the mixing water O D) Water to cement ratio A fine broom finish is done only for aesthetic purposes. OA) True O B) False O
Use the following volumetric relationships for asphalt mix analysis: VTM = 100 (1 - Gmb) VFA = 100 3. An asphalt concrete specimen has the following properties: Asphalt content = 5.5 % by total weigh of mix Bulk specific gravity of the mix = 2.475 Theoretical maximum specific gravity = 2.563 Bulk specific gravity of aggregate = 2.689 Assuming there is no absorption of binder, calculate the following: (a) Percent Voids in Total Mix (b) Percent Voids in Mineral Aggregate: VMA – VTM VMA (c) Percent Voids filled with asphalt: VMA = = (100 - Gmb Ps Gsb
Calculate the chemical shrinkage (cm3/g) for one gram of completely hydrated Portland cement with the following compound compositions: C3S = 65%, C2S = 19%, C3A = 4%, C4AF = 9%
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Design a concrete mix according to the following conditions: Design Specifications Concrete ramp (not reinforced) Slab thickness =270 mm Design strength (fc) = 25.5 MPa Standard deviation s= 1.86 MPa on 200 specimens Environment = Severe exposure to freeze-thaw and de-icing chemicals Slump = 50 mm Materials Available Cement: Type GU; specific gravity 3.15 Admixture: Air entraining admixture 8 ml/1% air/100 kg cement . Coarse Aggregate: Nominal maximum size = 37.5 mm Type = Crushed stone Bulk oven-dry specific gravity = 2.63 Absorption = 2.1% Oven-dry rodded density = 1755 kg/m3 Moisture content = 1.5% Fine Aggregate Type = Natural sand Bulk oven-dry specific gravity = 2.55 Absorption = 3.1% Moisture content = 4.3% Fineness modulus = 2.40
Determine the allowable number of repetitions N for an asphalt mix that has the design modulus of 3.2×10×106kPa. The load-induced tensile strain at the base of the asphalt beam specimen was 150με. Given, the percentage by volume of bitumen in the asphalt was 10.0, the laboratory to service life fatigue factor was 5, and the project had the desired reliability of 90%.

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