Grade of Specimen Mass of specimens (g) concrete 7 days 14 days 28 days Air Water Air Water Air Water G20 A1 2443 1398 2463 1412 2474 1421 A2 2458 1408 2447 1404 2478 1424 АЗ 2377 1362 2561 1470 2467 1418 G25 B1 2434 1401 2485 1432 2414 1393 B2 2453 1413 2471 1425 2347 1356 ВЗ 2447 1410 2487 1435 2460 1425 a) Calculate the density (convert into kg/m3) of all concrete specimens b) Determine the mean density of specimens for respective curing ages c) Plot the graph to show the density of both types of concrete at various curing ages d) Make comparison on the development of density of both grades of concrete

Grade of Specimen Mass of specimens (g) concrete 7 days 14 days 28 days Air Water Air Water Air Water G20 A1 2443 1398 2463 1412 2474 1421 A2 2458 1408 2447 1404 2478 1424 АЗ 2377 1362 2561 1470 2467 1418 G25 B1 2434 1401 2485 1432 2414 1393 B2 2453 1413 2471 1425 2347 1356 ВЗ 2447 1410 2487 1435 2460 1425 a) Calculate the density (convert into kg/m3) of all concrete specimens b) Determine the mean density of specimens for respective curing ages c) Plot the graph to show the density of both types of concrete at various curing ages d) Make comparison on the development of density of both grades of concrete

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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SECTION A Answer ALL Questions Physical and mechanical properties of civil engineering materials, their behaviour and characteristics in design and construction works. Answer below questions using your own words and understanding. (a) (i) Design a concrete mix for the following given data: A mean 28-day compressive strength (measured on standard cubes) of 45 MPa Slump = 40 mm, Uncrushed aggregate with maximum size of 20 mm Specific gravity of aggregate = 2.64 Fine aggregate passes through the 600 µm sieve = 48% No air entrainment required, ordinary Portland cement to be used. [Use supplied charts and table to get required values]
Determine the suitability of the aggregate, with the gradation tabulated below, for use in Portland cement concrete. Review the grain size distribution to determine if it meets all of the relevant specifications for use in concrete (i.e. gradation limits, fineness modulus and % fines). Refer to the specification for concrete aggregates (Table 7 – 10) below: Grain Size (mm) % Passing Cum %Retained 25 100 19 100 12.5 100 9.5 100 4.75 95 2.36 85 1.18 55 0.6 30 0.3 15 0.15 8 0.075 6
Determine the suitability of the aggregate, with the gradation tabulated below, for use in Portland cement concrete. Review the grain size distribution to determine if it meets all of the relevant specifications for use in concrete (i.e. gradation limits, fineness modulus and % fines). Refer to the specification for concrete aggregates (Table 7 – 10) below: Grain Size (mm) % Passing Cum %Retained 25 100 19 100 12.5 100 9.5 100 4.75 95 2.36 85 1.18 55 0.6 30 0.3 15 0.15 8 0.075 6 Fineness Modulus - write answer to two decimal places Percent fines - write answer to the nearest whole number % Meets Gradation Limits? - y/n (only type lower case "y" for yes and lower case "n" for no) Suitable for use in portland cement concrete subject to abrasion? - y/n (only type lower case "y" for yes and lower case "n" for no)
The weights of ingredients for producing 1 m³ of concrete as obtained from mix design calculations is given in the below table. The temperatures of ingredients are also shown in the same table. kg/m³ 350 160 Ingredient Cement Water Coarse Aggregate (SSD) Fine Aggregate (SSD) 1250 610 Temperature (°C) 40 30 30 35 If the absorption capacities of coarse and fine aggregates are 2 % and 2.5 % respectively, to which temperature water should be cooled down in order to obtain 1 m³ of 28 °C?
Q3) The result of sieve analysis of a sample of aggregate given in the Table below. According to ASTM C 33, the sample is acceptable or not? BS Total mass of sample 4 80 g Sieve size 10 mm 5 mm 2.36 mm 1.18 mm 600 μm 300 μm 150 μm €150μm ASTM in 4 8 16 30 50 100 <-100 Mass retained O 80 40 80 110 68 61
Ultrasonic pulse velocity (UPV) test in through transmission is applied on a concrete sample. If the travel path is 12 cm and transit time is 24 us, what is the UPV of this concrete sample? Comment on the quality of the concrete? O a. 2000 m/s, weak O b. 200 m/s, very weak O c. 5000 m/s, very good O d. 500 m/s, very weak O e. 3500 m/s, questionable
The requirements and material properties of an air entrained concrete mix are given below. Calculate the weights of the components of 1 m3 of concrete. Water content: 200 kg/m3 Air content: 7.5% W/C: 0.45 (By Weight) Dry aggregate volume in 1 m3 concrete mixture: 0.44 m3 Specific Gravity (g/cm3 ) water absorption capacity (%) Total Moisture (%) Cement 3.15 Fine aggregate (saturated surface 2.65 1.3 5.5 dry) Coarse aggregate (saturated surface dry) 2.7 0.5 1.5 Dry unit weight of coarse aggregate is 1,500 kg / m3. 'kind
he density of a hardened concrete test cylinder is to be measured prior to compression testing. The measured masses of the test cylinder are as follows: Mass of the cylinder measured in the air = 3.21 kg Mass of the cylinder measured under water = 1.87 kg. Based on this data, calculate the density of hardened concrete in kg/m^3.
Calculate the yield of concrete if the mass of the batch is 4800 kg and its density is found to be 350 kg/m3. Discuss the procedure for determining the temperature of freshly mixed concrete. How does one determine the diameter of a concrete cylinder specimen to be used in calculating its cross-sectional area?
25. M20 concrete is a grade of concrete which has a compressive strength equal to 20 MPa. I want to test if concrete with a raction of cement partially replaced with fly ash would be competftive with M20 concrete. What test should I perform given limited time and resources? O A. One sample t-test O B. One sample z-test O C. Two sample t-test D. Two sample z-test
As a design engineer at a batching plant company, you have been asked to design a concrete mix for pre-cast concrete beams with G40. By considering data given: Characteristic strength of concrete, 40 N/mm2 at 28 days Proportion defective, 10% (k=1.28) Standard deviation, 8 N/mm2 Ordinary Portland Cement Slump required, 30-60 mm Maximum crush aggregate, 20 mm Relative density of crushed aggregate (SSD), 2.7 Percentage passing 600 µm, 60% (i) Propose an appropriate design to fulfill the requirement of G40 by using a form in Appendix A.
Ultrasonic pulse velocity (UPV) test in through transmission is applied on a concrete sample. If the travel path is 15 cm and transit time is 48 us, what is the UPV of this concrete sample? Comment on the quality of the concrete. a. 1550 m/s, very weak 2000 m/s, weak 3450 m/s, questionable O b. O C. O d. 5000 m/s, very good O e. 3125 m/s, questionable