29 Segregation of aggregates can be minimized by a Building

29. Segregation of aggregates can be minimized by: a) Building stockpiles in a single cone b) Increasing the movements of the aggregates c) Increasing drop height d) Building stockpiles from similar aggregate sizes e) None of the above 30. What is Alkali-aggregate reactivity? a) Reaction between alkali in cement and silica and carbonate in aggreg b) Reaction between alkali in aggregate and silica and carbonate in cem c) Reaction between silica in aggregate and carbonate in cement d) Reaction between carbonate in aggregate and silica in cement e) None of the above 31. Nominal maximuti aggregate sjze is: a)-One size larger than the first sieve to pass more than 90% b) One size larger than the first sieve to retain more than 90% c) One size larger than the first sieve to retain more than 10% d) One size larger than the first sieve to pass more than 10% e) None of the above If the mass of oven dried aggregate is 5,116 grams, the mass of aggregates sub grams, the mass of SSD aggregate is 5,227 grams, and the mass of the the following four questions. 32. The aggregate bulk dry specific gravity is: a) 2.715 b) 2.700 c) 2.648 d) 2.684 e) None of the above 33. The aggregate apparent specific gravity is a) 2.715 b) 2.721 c) 2.815 d) 2.809 e) None of the above 34. The aggregate SSD specific gravity is: a) 2.715 721 None of the above bsorption (report as percent) is: 17% 1.57% c)

Solution

Q.29- option(d) is correct

Seggregation is because of non-homoginity of Mixture. if Cohesion force between particle is more Seggregation will be less. If we make stockpile of Aggregate having Same Size Homoginity will be maintained and also cohesion is high between similar particle so Seggregation is less.

Q.30-Option (c) is Correct

Aggregate contain Active Silica,when come in contact of cement in persence of water react to it cause expansion of concrete.

Q.31-Option (a) is correct

Option a is basic Definition of Nominal Size so No explanation is given.

Q.32-Option(c) is Correct as per assume data. because u have not given the Submerged weight of Aggregate.

let us assume Submerged weight of Aggregate W_s=1932gm

Oven dry weight of Aggregate W₁=5116gm, SSD weight W₂ =5227

we know bulk Specific Gravity=W₁/(W₂-W_s)=5116/(5227-1932)=2.648

Q.33 -Option (e)

Apparent Specific Gravity=W₁/(W₁-W_s)=5116/(5116-1932)=1.607

Q.34 -option (e)

SSD Specific Gravity=W2/(W2-W_s)=5227/(5227-1932)=1.586

from Question 32 to 34 calculation is based on Assume value of missing data,but formula is universal so find Correct answer which can match to your option Replace Assume value to actual value nothing else...

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