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t3501-f04-002

# t3501-f04-002 - CGN 3501 TEST NO 2 NAME THIS IS A...

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1 CGN 3501 TEST NO. 2 NAME _______________________ 10/20/2004 THIS IS A CLOSED-BOOK TEST. THE USE OF A CALCULATOR IS NOT ALLOWED EXCEPT IN DOING PART I OF THIS TEST. PART I – MIX DESIGN PROBLEMS A 7-bag concrete mix is to be designed. (Note: This means that the cement content is already fixed.) The required slump for the fresh concrete is 3-4 inches. The concrete is to be non-air- entrained. The properties of the aggregates to be used are given below. Proportion the ingredients for one cubic yard of concrete using the Absolute Volume Method. Use the tables on the next page for this problem. (40 pts.) Properties of aggregates : Coarse Agg. Fine Agg. Dry Bulk Specific Gravity 2.35 2.61 Absorption 4.5% 0.4% Natural Moisture 4.5% 0.4% Maximum size 3/4 inch - Fineness Modulus - 2.4 Unit Weight 99 pcf -

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3 PART II – QUESTIONS (5 pts each) 1. What are the effects of air-entraining admixture on (A) the workability of fresh concrete, (B) the durability of the hardened? (Describe one effect for each.) 2.

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t3501-f04-002 - CGN 3501 TEST NO 2 NAME THIS IS A...

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