(b). Calculate the amount of cement, water, fine aggregate, and coarse aggregate per trial mix of 0.005 m³ of concrete. Use the data listed below: (use the tables and graphs provided in the appendix and submit them together with your answer). Characteristic compressive strength (fc) = 30 N/mm? at 28 days, with a 2.5% defective rate Standard deviation = 8 N/mm? Portland cement strength class 42.5 Slump required = 10–30 mm %3D Maximum aggregate size = 20 mm granite?? Fine aggregate: 70% passing 600 µm sieve river sand?? Specific gravity of aggregate = 2.6 Maximum free-w/c ratio = 0.55 Minimum cement content = 290 kg/m³ Maximum cement content = not specified.

(b). Calculate the amount of cement, water, fine aggregate, and coarse aggregate per trial mix of 0.005 m³ of concrete. Use the data listed below: (use the tables and graphs provided in the appendix and submit them together with your answer). Characteristic compressive strength (fc) = 30 N/mm? at 28 days, with a 2.5% defective rate Standard deviation = 8 N/mm? Portland cement strength class 42.5 Slump required = 10–30 mm %3D Maximum aggregate size = 20 mm granite?? Fine aggregate: 70% passing 600 µm sieve river sand?? Specific gravity of aggregate = 2.6 Maximum free-w/c ratio = 0.55 Minimum cement content = 290 kg/m³ Maximum cement content = not specified.

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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Please give me both a and b answers a. If a concrete with 28 day compressive strength of 4500 psi is being poured, then it how much strength would you expect after 7 days(assuming good curing conditions)? Explain how you obtain the 7 day strength? b. Briefly explain the effect of water to cement ratio on concrete strength?
Home The compressive strength of samples of cement can be modeled by a normal distribution with a mean, , of 6000 kg/cm² and a standard deviation, o, of 100 kg/cm². (a) What is the probability that a sample's strength is less than 6250 kg/cm²? Ans. 0.9938. (b) What is the probability that a sample's strength is between 5800 and 5900 kg/cm²? Ans. 0.1359 (c) What strength is exceeded by 95% of the samples? Ans. 5836.5
Problem 2: If f = 3 ksi what is the modulus of elasticity Ec and the maximum tensile stress fr that the concrete can carry before cracking (use ACI recommended equations). Assume a unit weight of the plain concrete is: a. Wc = 90- b. w lb lb 118- ft39 ft3) C. W = 160- Problem 3: Wight 3-6 Rugblom 4: Wight ? 7 lb ft3
Three 150 mm * 300 mm concrete cylinders with water to cement ratios of0.4, 0.6, and 0.8, respectively. After curing for 28 days, the specimens weresubjected to increments of compressive loads until failure. The load versusdeformation results were as shown in Table P7.26. Assuming that the gauge length is the whole specimen height, it is required todo the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for all specimens on one graph.c. The ultimate strength for each specimen.d. The modulus of elasticity as the secant modulus at 40% of the ultimatestress for each specimen.e. The strain at failure for each specimen.f. The toughness for each specimen.g. Comment on the effect of increasing the water–cement ratio on thefollowing:i. Ultimate strengthii. Modulus of elasticityiii. Ductilityiv. Toughness. Curves may be approximated with a series of straight lines.
150 mm * 300 mm concrete cylinders were made of the same batch and sepa- rated at random to six equal groups. The six groups of cylinders were sub- merged in water for different times before testing for compressive strength and the results are shown in Table P7.39. It is required to do the following: a. Determine the compressive strength at different curing times. b. Using an Excel sheet, plot the relationship between curing time and compressive strength. Label all axes and curves. c. Comment on the effect of curing time on the compressive strength. d. What is the approximate ratio between the compressive strengths at 7 days and 28 days? e. What is the approximate ratio between the compressive strengths at 28 days and 180 days?
Two batches of concrete cylinders were made with and without a calciumchloride (CaCl2) accelerator admixture. Five cylinders were made of eachbatch and submerged in water for different times before testing for compres-sive strength and the results are shown in Table P6.36.It is required to do the following:a. Using an Excel sheet, plot the relationship between curing time andcompressive strength of the two mixes on the same graph. Label all axesand curves.b. Comment on the effect of the accelerator on the compressive strength ofPCC at early and late ages.
Urgent Take the unit weight of concrete to be 2400 kg/m3 and the specified compressive strength to be 28 MPa.From this, estimate the modulus of elasticity of concrete in GPa. (answer with complete solution) Final answer must be Ec = 26.752 GPa
Q2: (10 %) of concrete samples have compressive strength less than (30 mn/m2) and (20%) have strength greater than (36mn/m2), if the minimum acceptable strength is (28 mn/m2). What is the prob. that sample will have strength fess them the minimum (one unitin LS.D.=1}7
The characteristic compressive strength of concrete required in a project is 25 MPa and the standard deviation in the observed compressive strength expected at site is 4 MPa. The average compressive strength of cubes tested at different water-cement (w/c) ratios using the same material as is used for the project is given in the table. w/c(%) Average compressive strength of cubes (MPa) 45 35 50 25 55 20 60 15 The water-cement ratio (in percent, roundoff to the lower integer) to be used in the mix is
Use different types of accelerators in concrete and determine their effect on fresh concrete (i.e find their slump values and setting times etc). Do comparison and give remarks.
Compressive Strength is conducted for each aggregate with 3 specimens for each no. of days of curing. The recorded maximum load when the specimen breaks are as follows 7 Days (kN) | 486.73 14 Days (kN) 28 Days (kN) 678.8 ... 746.3 3/8" Sample 513.14 694.2 754.7 360.71 679.8 759.8 7 Days (kN) 14 Days (kN) 28 Days (kN) 231.86 339.8 377.7 3/4" Sample 252.04 339.6 381.1 206.69 343.3 379.9 Compute the compressive strength, in psi, for each size of aggregate on each no. of days of curing. Please indicate if the sample passed the required strength for each no.of days of curing. Conversion: 1lb-f = 4.488 N Attach your solution on the box below, image type.
a) Calculate the temperature of aggregates to produce fresh concrete having the sametemperature with the ambient temperature. Following data in Table 1 could be used: