The construction of a new high rise reinforced concrete building for commercial, office, and residential purposes has been planned in the area of George Town, Pulau Pinang. The mass concrete foundation of the planned high-rise building requires special cement with low heat evolution and high sulphate resistance characteristics. Select between the two Portland cements A and B with oxide compositions given in Table 2 that better meets the requirements for the construction of the mass concrete foundation of the highrise building. Justify your response with detailed discussion based on the compound compositions of the cements. Use the given Bogue’s equations.
The construction of a new high rise reinforced concrete building for commercial, office, and residential purposes has been planned in the area of George Town, Pulau Pinang. The mass concrete foundation of the planned high-rise building requires special cement with low heat evolution and high sulphate resistance characteristics. Select between the two Portland cements A and B with oxide compositions given in Table 2 that better meets the requirements for the construction of the mass concrete foundation of the highrise building. Justify your response with detailed discussion based on the compound compositions of the cements. Use the given Bogue’s equations.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
The construction of a new high rise reinforced concrete building for
commercial, office, and residential purposes has been planned in the area of
George Town, Pulau Pinang. The mass concrete foundation of the planned
high-rise building requires special cement with low heat evolution and high
sulphate resistance characteristics. Select between the two Portland cements
A and B with oxide compositions given in Table 2 that better meets the
requirements for the construction of the mass concrete foundation of the highrise building. Justify your response with detailed discussion based on the
compound compositions of the cements. Use the given Bogue’s equations.
Transcribed Image Text:Table 2: Oxide compositions of cement
Oxide
Content (%)
Cement A
Cement B
Сао
61
63
SIO2
24
20
Al2O3
4.3
Fe2O3
4.6
Mgo
1.5
1.5
Alkalis
1
2
SO3
1
1
Insoluble residue
0.5
1
Loss on ignition
1.1
Others
1
0.5
Bogue's Equations
C3S = 4.07(CaO) – 7.60(SiO2) – 6.72(Al2O3) – 1.43(Fe2O3) – 2.85(SO3)
%D
C2S = 2.87(SiO2) – 0.754(3CaO.SIO2)
%3D
СЗА %3D2.65(Al2Оз) — 1.69(Fe20з)
C4AF = 3.04(Fe2O3)
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