CE 310 Civil Engineering Materials Mon October 16th,2017 QUIz Instruction: Answe

Question

CE 310 Civil Engineering Materials Mon October 16th,2017 QUIz Instruction: Answer all 6 questions 1) Laboratory specific gravity and absorption tests were run on 2 coarse aggregate sizes, which were to be blended and the results were as follows: Aggregate A: Bulk Specific Gravity = 2.854; Absorption . 0.4% Aggregate B: Bulk Specific Gravity-2.491; Absorption . 5.2% a) what is the specific gravity of a mixture of 60% Aggregate A and 40% Aggregate B by weight? b) What is the absorption of the mixture? The bulk relative density of an aggregate mass is given as 2.62. The percent absorption of the same aggregate mass is stipulated as 1.2%. saturated surface dry density respectively. 2) Find the relative density apparent and the Describe how it is computed with a short Define the Fineness Modulus of an aggregate. illustration. What does a low value indicate about an aggregate mass? Correspondingly what does a high value of FM indicate about an aggregate mass? Why is the FM an important parameter in mix design? 3) 4) Discuss aggregate durability and describe a laboratory test for evaluating it in an aggregate. Discuss the term 'Pozzolan' and give examples of natural and artificial pozzolans. Discuss the distinctive pozzolanic reaction and represent it in the cement industry's short hand notation. 5) Each year vast quantities of aggregates are extracted from the environment and used in con- struction. How sustainable is this practice and what long term strategies would you recommend for addressing the problem? 6)

Explanation / Answer

Hi,

Due to constraints solving the first question in the sequence.

Hope this helps.

Thanks.

1. A] Specific gravity of Mixture =

[(S.G of A * percent weight of aggr. A) + (S.G of B * percent weight of aggr. B)] / (100)

=[ (2.854 * 60) + (2.491 * 40) ] / 100
= 2.7088

B] percent absoption of the mixture = [ (0.40 * 60 ) + (5.2*40) ] / 100

= 2.32 %

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