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Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-IV (NEW) EXAMINATION - WINTER 2018
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Subject Code:2140608 Date:01/12/2018
Subject Name:Concrete Technology
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Time: 02:30 PM TO 05:00 PM Total Marks: 70Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS |
|---|
Q.1 (a) How is the cement checked on site? How is the field testing important? 03 (b) Differentiate between 04 --- Content provided by FirstRanker.com ---
--- Content provided by FirstRanker.com --- (c) Determine the Fineness Modulus for the given Sieve analysis performed on Fine 07 aggregate IS Sieve size mm 10 4.75 2.36 1.18 600 300 150 --- Content provided by FirstRanker.com --- Weight retained gm 0 25 45 50 95 175 80 |
Q.2 (a) Explain the effect of size, shape, texture and grading on concrete. 03 (b) Discuss the various factors affecting the workability of concrete. 04 --- Content provided by FirstRanker.com --- (c) Explain different methods of curing procedure: 07OR (c) Explain soundness test in detail with neat sketch and also specify its Indian 07 standards. --- Content provided by FirstRanker.com --- |
Q.3 (a) What is alkali-silica reactivity (ASR) and how is it avoided? 03 --- Content provided by FirstRanker.com --- (b) What are the essential characteristics of water that can be used for mixing and 04 curing of concrete? (c) Write short note on air entrained concrete. 07 --- Content provided by FirstRanker.com --- ORQ.3 (a) Make a list of all the factors that affect Durability of Concrete structures. 03 (b) Draw the typical stress-strain curve of concrete and explain the various modulus 04 of elasticity --- Content provided by FirstRanker.com --- (c) Write short note on ready mix concrete 07 |
Q.4 (a) Briefly explain Gel-space ratio. 03 (b) Write a brief note on “Rotary Kiln”. 04 --- Content provided by FirstRanker.com --- (c) The results of compressive strength test on 15 cubes of a batch in MPa are 19, 18, 07 21,24, 19, 18.5, 20, 21.5, 22, 23, 19.5, 17.5, 24, 21, 20. Find Standard Deviation and Coefficient of Variation for the batch.OR Q.4 (a) Define admixtures and creep. 03 --- Content provided by FirstRanker.com --- (b) Define the term “Bulking of aggregates”. Explain its significance with reference 04 to concrete making. (c) What are Bouge’s compounds? Explain in detail how each one of these 07 compounds influences the strength and setting properties of cement. |
Q.5 (a) What are the Principles of concrete mix design? 03 --- Content provided by FirstRanker.com --- (b) Explain the adverse effect of excessive use of admixture? 04(c) What is non-destructive testing of in-situ fresh and hardened concretes? Discuss 07 the pulse velocity method. OR --- Content provided by FirstRanker.com --- Q.5 (a) Using IS-10262(2009) method of mix design, find out proportions of concrete for 14 following data: Grade of Concrete: M 25 --- Content provided by FirstRanker.com --- Degree of Control: Very goodMaximum size of Aggregate: 10 mm Specific gravity of Cement: 3.15 --- Content provided by FirstRanker.com --- Specific gravity of FA: 2.70 Specific gravity of CA: 2.82 --- Content provided by FirstRanker.com --- Condition of Exposure: severeWorkability: Slump 75-100 mm Refer table 1 to 4. --- Content provided by FirstRanker.com --- |
Table 1
| EXPOSURE | RCC PCC Min Grade | MINIMUM CEMENT CONTENT | MAX w/c RATIO | MINIMUM CEMENT CONTENT | MAX w/c RATIO | PCC | RCC |
|---|---|---|---|---|---|---|---|
| MILD | 300 | 0.55 | 220 | 0.6 | M20 | ||
| MODERATE | 300 | 0.50 | 240 | 0.6 | M15 | M25 | |
| SEVERE | 320 | 0.45 | 250 | 0.5 | M20 | M30 | |
| VERY SEVERE | 340 | 0.45 | 260 | 0.45 | M20 | M35 | |
| EXTREME | 360 | 0.40 | 280 | 0.4 | M25 | M40 |
Table 2
| No. | Grade | Std. deviation |
|---|---|---|
| 1 | < 35 | |
| 2 | 25 | 4 |
| 5 | 30 | 5 |
| 5 | 35 | 5 |
| 7 | 40 |
TABLE 3
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| Max. size of Aggregate | Gonent |
|---|---|
| (kg) | |
| 10 | 208 |
| 20 | 186 |
| 40 | 165 |
TABLE 4
| Nominal Maximum size of aggregate, mm | Volume of coarse aggregate per unit volume of total aggregate for different zones of fine aggregate (For w/c ratio of 0.5 | |||
|---|---|---|---|---|
| Zone IV | Zone II | Zone I | Zone I | |
| 10 | 0.5 | 0.48 | 0.46 | 0.44 |
| 20 | 0.66 | 0.64 | 0.62 | 0.6 |
| 40 | 0.75 | 0.73 | 0.71 | 0.69 |
Volume of coarse aggregate per unit volume of total aggregate needs to be changed at the rate of -/+ 0.01 for every +-0.05 change in w/c ratio
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