Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6, e=7) In my case std 174702 Q1) Design...

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Civil Engineering

Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6,e=7)
In my case std 174702

Q1) Design a concrete mixture proportions which will be used foroffshore concrete platform. Norway is a world leader on offshoreconcrete platforms with 1a of the worldâ€™s 30 larger offshoreconcrete structures located on the Norwegian continental shelf. Thefirst of these platforms where the Ekofisk Tank installed in 1974and the last was Troll gravity based structure installed in 1996.The Sakhalin project is located in a harsh and artic environmentwhere concrete structures have proven excellent characteristicswith a minimum of maintenance. 80 mm slump value is required forthe Sakhalin project. 28-days concrete characteristic strength is2b MPa. It is required that no more than 1 test result in 100 willfall below the specified strength. The fine aggregate has afineness modulus of 2.60 and Zone 3. For Coarse Aggregate(Uncrushed): SSD Bulk Specific Gravity: 2.65, Absorption Capacity:2.b %, Total Moisture: 1.c % and Dry Rodded Unit Weight: 1345kg/m3. For Fine Aggregate (Uncrushed): SSD Bulk Specific Gravity:2.70, Total Moisture: 3.d % and Free Moisture: 2 %. Cement:Portland Composite Cement, Specific Gravity: 2.97. For 0.e5 m3 ofconcrete, binder amount is calculated as 120 kg (Use ACI Method ofMix Design)

Q2) What would be the maximum aggregate size used for the givenmixture properties by using ACI Method of Mix Design. 28-dayspecified concrete strength is 3b Mpa, standard deviation ischoosen as 3.a Mpa and it is required that no more than 1 testresult in 200 will fall below the specified strength.
Project Title: Detoration of wood column of a commercialbuilding
Project summary: Wood deterioration at the lower level of a heavytimber column, which supports five floor levels, was remedied byremoving a section of column and the construction of a new concretepier and footing.
For Coarse Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.60,Absorption Capacity: 1.8 %, Total Moisture: 2.3 % and Dry RoddedUnit Weight: 1430 kg/m3.
For Fine Aggregate (Crushed): SSD Bulk Specific Gravity: 2.70,Total Moisture: 3.c % and Free Moisture: 1.d %. FM= 2.65, ZoneII.
Cement: Portland Composite Cement, Specific Gravity: 3.01. For 0.2am3 cement is calculated as 12b kg.

Q3) use the data in question 2 and determine the amount of chemicaladmixture required for 0.b% and 0.cd%

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4.3 Ratings (539 Votes)

Ans 1 Let the total volume of trial mix be 1 m3 The nominalaggregate size suitable for construction of concrete platform is 19mmAccording to ACI 211191 table 633 for 80 mm slump andnominal aggregate size of 19 mm amount of water required percubic meter of concrete is 193 kg Amount of water 193 kg per m3 concreteSince concrete exposed to aggressive environment class ofexposure is severe so air content for 19 mm aggregate sizeis 6 Now required compressive strength as per ACIfcr fc 83 fcr 24 83 323 MPaNow according to Table 634 a for compressive strength of323 MPa water cement ratio is 043Minimum Cement content per cubic meter concrete 120 095 480 kgHence amount of cement Amount of water wc ratio 193 043 44884 kg 480 kgHence See Answer

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