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Table 2: Slump test Grade of concrete Slump (mm) Remark True slump True slump G20 60 G25 30 a) How would you define workability? b) What is slump loss and why does workability decrease with time? c) What are the principle components of workability and their significance in concrete construction practice?

Table 2: Slump test Grade of concrete Slump (mm) Remark True slump True slump G20 60 G25 30 a) How would you define workability? b) What is slump loss and why does workability decrease with time? c) What are the principle components of workability and their significance in concrete construction practice?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Table 2: Slump test Grade of concrete Slump (mm) Remark True slump True slump G20 60 G25 30 a) How would you define workability? b) What is slump loss and why does workability decrease with time? c) What are the principle components of workability and their significance in concrete construction practice? d) Calculate the approximate volume of concrete required for slump test as shown in Table 2 e) Determine the degree of workability of both grades of concrete base on the slump test result. f) With appropriate of diagram, explain the meaning of true slump g) Why G25 concrete has a lower slump than G20 concrete. Explain the factor affecting. h) Suggest the appropriate application of both types of concrete according to their slump results. Table 3: Compacting Factor Test Weight of concrete (kg) Grade of concrete Partial compacted Fully compacted G20 15.3 16.1 G25 14.3 16.1 a) Determine the workability factor using the compacting factor formula for both grades of concrete. b) Calculate the approximate volume of concrete required for compacting factor test as shown in Table 2 c) Determine the degree of workability of the two grades of concrete base on the compacting factor test result. d) Define the following phenomena and significance and factor affecting them: segregation and bleeding (please explain with an appropriate picture or diagram)? e) Discuss the measures that can reduce the bleeding of concrete.
Transcribed Image Text:Table 2: Slump test Grade of concrete Slump (mm) Remark True slump True slump G20 60 G25 30 a) How would you define workability? b) What is slump loss and why does workability decrease with time? c) What are the principle components of workability and their significance in concrete construction practice? d) Calculate the approximate volume of concrete required for slump test as shown in Table 2 e) Determine the degree of workability of both grades of concrete base on the slump test result. f) With appropriate of diagram, explain the meaning of true slump g) Why G25 concrete has a lower slump than G20 concrete. Explain the factor affecting. h) Suggest the appropriate application of both types of concrete according to their slump results. Table 3: Compacting Factor Test Weight of concrete (kg) Grade of concrete Partial compacted Fully compacted G20 15.3 16.1 G25 14.3 16.1 a) Determine the workability factor using the compacting factor formula for both grades of concrete. b) Calculate the approximate volume of concrete required for compacting factor test as shown in Table 2 c) Determine the degree of workability of the two grades of concrete base on the compacting factor test result. d) Define the following phenomena and significance and factor affecting them: segregation and bleeding (please explain with an appropriate picture or diagram)? e) Discuss the measures that can reduce the bleeding of concrete.
Table 4: Density of hardened 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 B3 2447 1410 2487 1435 2460 1425 a) Calculate the density (convert into kg/m2) 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 Table 5: Compressive strength Grade of Specimen Maximum load (kN) concrete 14 days 7 days 133.0 28 days G20 A1 161.0 198.0 A2 130.0 158.0 195.0 АЗ 145.0 172.0 203.0 G25 B1 170.0 204.0 252.0 B2 162.0 193.0 241.0 B3 181.0 225.0 263.0 a) Calculate the compressive strength (convert into N/mm?) of all concrete specimens b) Determine the mean compressive strength of specimens for respective curing ages c) Plot the graph to show the compressive strength of both types of specimens at various curing ages d) Make comparison on the development of strength rate of both types of concrete e) Discuss the effects of curing age in development of compressive strength of concrete f) With using appropriate chart, explain the relationship between density of concrete and compressive strength for both G20 and G25 concrete
Transcribed Image Text:Table 4: Density of hardened 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 B3 2447 1410 2487 1435 2460 1425 a) Calculate the density (convert into kg/m2) 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 Table 5: Compressive strength Grade of Specimen Maximum load (kN) concrete 14 days 7 days 133.0 28 days G20 A1 161.0 198.0 A2 130.0 158.0 195.0 АЗ 145.0 172.0 203.0 G25 B1 170.0 204.0 252.0 B2 162.0 193.0 241.0 B3 181.0 225.0 263.0 a) Calculate the compressive strength (convert into N/mm?) of all concrete specimens b) Determine the mean compressive strength of specimens for respective curing ages c) Plot the graph to show the compressive strength of both types of specimens at various curing ages d) Make comparison on the development of strength rate of both types of concrete e) Discuss the effects of curing age in development of compressive strength of concrete f) With using appropriate chart, explain the relationship between density of concrete and compressive strength for both G20 and G25 concrete
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