For concrete's subjected to freeze-thaw cycles air-entraining admixtures are used to increase the durability of concrete. In addition, there is always some unavoidable entrapped air. During the mix- design calculations of a mix without any air entrainment, usually an amount of entrapped air is assumed. For such a mix, the masses of the ingredients for 1 m3 of mix are found as: Water (172 kg), Cement (330 kg), SSD Coarse agg. (1040) kg, SSD Fine agg. (750 kg). Calculate the assumed amount of entrapped air in the mix and state what could be done in the field to reduce the amount of entrapped air?
For concrete's subjected to freeze-thaw cycles air-entraining admixtures are used to increase the durability of concrete. In addition, there is always some unavoidable entrapped air. During the mix- design calculations of a mix without any air entrainment, usually an amount of entrapped air is assumed. For such a mix, the masses of the ingredients for 1 m3 of mix are found as: Water (172 kg), Cement (330 kg), SSD Coarse agg. (1040) kg, SSD Fine agg. (750 kg). Calculate the assumed amount of entrapped air in the mix and state what could be done in the field to reduce the amount of entrapped air?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![For concrete's subjected to freeze-thaw cycles air-entraining admixtures are used to increase the
durability of concrete. In addition, there is always some unavoidable entrapped air. During the mix-
design calculations of a mix without any air entrainment, usually an amount of entrapped air is
assumed. For such a mix, the masses of the ingredients for 1 m3 of mix are found as: Water (172 kg),
Cement (330 kg), SSD Coarse agg. (1040) kg, SSD Fine agg. (750 kg). Calculate the assumed amount of
entrapped air in the mix and state what could be done in the field to reduce the amount of entrapped
air?
The specific gravities of ingredients are given as: Water 1.0, Cement 3.15, SSD Coarse Agg. : 2.55, SSD
Fine Agg. : 2.52](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F03645831-2053-484a-94e7-4edd11488b54%2F9b6a0847-7d33-478c-9ded-251f95351887%2Fqcypugf_processed.png&w=3840&q=75)
Transcribed Image Text:For concrete's subjected to freeze-thaw cycles air-entraining admixtures are used to increase the
durability of concrete. In addition, there is always some unavoidable entrapped air. During the mix-
design calculations of a mix without any air entrainment, usually an amount of entrapped air is
assumed. For such a mix, the masses of the ingredients for 1 m3 of mix are found as: Water (172 kg),
Cement (330 kg), SSD Coarse agg. (1040) kg, SSD Fine agg. (750 kg). Calculate the assumed amount of
entrapped air in the mix and state what could be done in the field to reduce the amount of entrapped
air?
The specific gravities of ingredients are given as: Water 1.0, Cement 3.15, SSD Coarse Agg. : 2.55, SSD
Fine Agg. : 2.52
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