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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A sample of aggregate weighing of 3800g. 45.5% retaining on sieve No.4. and 48.5% it is retaining on sieve No 200. If bulk specific - gravities of coarse , fine and mineral filler aggregates are 2.59 , 2.66 , and 2.69 respectively, determine the optimum asphalt conten as a percentage of the total mix if results obtained using the Marshall method are shown in the table below. The specific gravity of the asphalt is 1.05. Given that the specifications required minimum Marshal Stability of ( 7kN ). Flow (2-4mm) and percent of air voids (3-5%). (Note: if the mix is not satisfy the requirement, please explain how to adjust it). Marsha test Weight of sample (gm) Asphalt content (%) Stability (kN) Flow (mm) In air In water 0.04 1260.4 716.3 6.25 2.9 0.045 1298.9 747.8 7.1 3.2 0.05 1127.7 652.9 7.9 3.8 0.055 1222.5 705.6 7.5 4.5 0.06 1182.6 679.8 5.9 6.05
H.W select a mix proportional of 28-day compressive strength (measured on standard cubes) of 56 MPa , slump of 65 mm; uncrushed aggregate with a maximum size of 10 mm; specific gravity of aggregate of 2.64, zone 2 of fine aggregate, repaid setting Portland cement to be used. The percentage absorption of fine aggregate is 1.25% ,and coarse aggregate 2.3% the max. w/c 0.4 and min. cement content 390 kg/m3.
Q1: Prepare mix design for given data • The 28-day compressive strength should be 34 MPa, The slump should be between 75 mm and 100 mm and the maximum aggregate size should not exceed 19 mm The properties of the materials are as follows: • Cement : Type I, specific gravity = 3.15 • Coarse Aggregate: Bulk specific gravity= 2.65; absorption capacity = 0.5%; dry-rodded unit weight = 1605 kg/m3, surface moisture = 1% • Fine Aggregate: Bulk specific gravity= 2.60; absorption capacity = 1.1%; fineness modulus = 2.70; surface moisture = 3%
E Q2: Two types of asphalt cement (A and B) have been tested with different temperatures to indicate the kinematic viscosity and the table below presented the results. 1- Draw the viscosity vs temperature chart, 2- Indicate the raixing and compaction temperatures ranges for each type, 3- Which one is more susceptible to temperature change? 130 140 Temperature, C Kinematic viscosity, centistoke Type A Type B 600 800 420 500 150 300 290 160 220 180 Dis 170 D857
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 ?
We require a mix with a mean 28-day compressive strength of 40 MPa the size of the member and the spacing of the reinforcement require a slump of 45 mm and a maximum size of aggregate of 28 mm. Portland cement type I is used with specific gravity of 3.15, dry-rodded unit weight of coarse aggregate 1750 kg/m³ and bulk specific gravity (SSD) of 2.55. The fineness modulus of fine aggregate is 2.8 and bulk specific gravity (SSD) of 2.5 ,No air entrainment is required. Neglect water absorption and moisture content of both aggregates. The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse aggregate and water) for 1m³ concrete.
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.
Refer to Appendix A for tables and equations to be used. Use the CNCI method. water requirementinliters w:c ratio • Cement content (kg/m of concrete) = • Mat = CBD (K – 0.1 FM) You are given the following design parameters for a concrete mix: M. M. D. • Vols = 1000 - The compressive strength of the concrete mix must be 40 MPa after 28 days. The cement that is going to be used is a CEM I 52.5 with a relative density of 3.14. The stone available Taps vis % water 30 is a 19.0 mm stone with a dry compacted bulk density (CBD) of 1780 kg/m3 and a relative density of 2.24. An average, natural sand with a fineness modulus of 2.45 and a relative 25 20 density of 2.86 is going to be used for the mix. The slump on site is specified as 75 mm. 15 The concrete is going to be compacted by moderate vibration on site. 10 5 Calculate and show the amount of water, cement, stone and sand that is needed to make 10 15 20 Тарв up 1 m3 of concrete mix as specified above.
Design and control of concrete Mixture 16 Edition Please do all questions
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.
Second Section The composition of a certain brand of cement is given (C3S = 53.0%, C2S = 18.0%, C3A=12.0% and C4AF = 8.0%) the type of cement is * Sulphate resisting cement Rapid hardening cement Ordinary Portland cement Low heat cement For the If the chemical composition of cement is as follows (CaO=60%, SIO2 =25.6%, AI203= 3.8%, MgO=4%, SO3=2.1%, C4AF=13.7%) the type of cement is * White cement None of the above Expansive cement Pozzolanic cement

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