Enrolment No.

/Seat No_______________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE- SEMESTER–V (NEW) EXAMINATION – WINTER 2024
Subject Code:3150610 Date:28-11-2024
Subject Name:Concrete Technology
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

Marks

Q.1 (a) Explain the roles of each ingredient used in concrete. 03

(b) Explain the function of Bogue’s compound in the hydration process of cement. 04
(c) Discuss the step-by-step procedure of concrete mix design as per IS:10262. 07

Q.2 (a) Differentiate between initial setting time and final setting time of cement, and 03
explain their significance in construction.
(b) Discuss the role of plasticizers in concrete and their effect on workability. 04
(c) Enlist different types of cement used in construction and explain any three types 07
concerning to their applications and advantages.
OR
(c) Explain the step-by-step dry process of manufacturing of Ordinary Portland 07
Cement using a flow chart.

Q.3 (a) Explain Slump cone test for measuring the workability of concrete. 03
(b) Discuss different methods of curing of concrete. 04
(c) Explain various factors affecting the workability of concrete in detail. 07
OR
Q.3 (a) Explain the causes and prevention of segregation of concrete. 03
(b) Enlist various methods of concrete compaction and explain their importance. 04
(c) What is Slump loss? Discuss various measures to control slump loss in concrete. 07

Q.4 (a) Discuss various types of shrinkage of the concrete. 03

(b) Enlist various non-destructive tests of concrete and explain any one in detail. 04
(c) Explain the procedure for performing a compressive strength test on concrete 07
cubes.
OR
Q.4 (a) Explain the impact of aggregate grading on the compressive strength of concrete. 03
(b) Discuss various factors that influence the durability of concrete. 04
(c) Explain various factors affecting the compressive strength of concrete in detail. 07

Q.5 (a) How does the marine environment affect the durability of concrete? 03
(b) Write and short not on ready-mix concrete. 04
1
 (c) Enlist various admixtures used in the concrete. Explain any two admixtures in 07
detail.
OR
Q.5 (a) Explain the role of gypsum in the hydration process of cement. 03
(b) Write a short note on lightweight concrete 04
(c) Explain the precautions that should be taken during concreting in hot and cold 07
weather conditions

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2
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–V (NEW) EXAMINATION – WINTER 2023
Subject Code:3150610 Date:07-12-2023
Subject Name:Concrete Technology
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

MARKS

Q.1 (a) Explain the precautions to be taken in storing cement. 03

(b) Explain the role of each Bogue’s compound in the process of hydration of cement. 04
(c) Briefly explain the wet process of manufacture of cement. 07

Q.2 (a) Write a brief note on: (a) Natural aggregates (b) Artificial aggregates (c) Recycled 03
aggregates.
(b) Distinguish between OPC and PPC. 04
(c) How does strength of aggregate influence the strength of concrete? With a typical 07
stress-strain curve for aggregate, concrete and cement paste illustrate the influence.
OR
(c) Determine the fineness modulus of the sand for which sieve result is as shown 07
below:
I.S. sieve 10 4.75 2.36 1.18 0.600 0.300 0.150 0.075
size mm mm mm mm mm mm mm mm
Percentage 100 90 78 56 28 10 8 6
passing

Q.3 (a) Explain the terms ‘flakiness index’ and ‘elongation index’ as applied to coarse 03
aggregates.
(b) Explain the test to determine crushing value of aggregates. 04
(c) What are mineral admixtures? Why are they generally used? List various mineral 07
admixtures used with concrete.
OR
Q.3 (a) State the functions of water in making concrete. 03
(b) Differentiate between high-strength concrete and high-performance concrete. 04
(c) In a mix design, the following proportion (in kg per m3 of concrete) is arrived at: 07
Water: Cement: FA: CA = 185: 370: 778: 1024. If fine aggregate at site is found to
contain 2% moisture and coarse aggregate contains 1% moisture, determine the
correct proportion to be used at site.

Q.4 (a) After designing concrete mix for first trial, how do you proceed to finalize the mix 03
with further trial?
(b) Write explanatory notes on no-fines concrete. 04
(c) State factors affecting compressive strength of concrete and explain any one in 07
detail.
OR
Q.4 (a) What precautions will you take, if concreting is to be done above 40°C? 03
(b) Explain segregation of concrete in detail. 04
(c) List various methods of concreting under water and explain ‘tremie’ method. 07

1
Q.5 (a) What is shrinkage? Give the classification of shrinkage. 03
(b) Define workability and discuss factors affecting workability. 04
(c) What is self-compacting concrete? And what are the advantages and disadvantages 07
of using it?
OR
Q.5 (a) Explain mechanism of sulphate attack on concrete. 03
(b) Discuss the effect of freezing and thawing on concrete. 04
(c) Explain the basic principle on which rebound hammer works. What are its 07
limitations?

*************

2
Enrolment No./Seat No_______________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–V EXAMINATION – SUMMER 2025
Subject Code:3150610 Date:15-05-2025
Subject Name:Concrete Technology
Time:02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

MARKS

Q.1 (a) Explain the dry process of cement manufacturing using a flowchart. 03
(b) Enlist and explain the functions of each Bogues compound. 04
(c) Define workability. List the factors affecting the workability of concrete 07
and explain any three in detail.

Q.2 (a) Differentiate between volume batching and weigh batching in concrete 03
mix procedure.
(b) What modifications can a civil engineer implement to make the concrete 04
industry more sustainable?
(c) Explain the bulking of sand using a graph showing the variation of bulking 07
with moisture content.
OR
(c) What is curing? List the different methods of curing, and explain any one 07
method in detail.
Q.3 (a) Enlist the different types of cement. Differentiate between rapid-hardening 03
cement and quick-setting cement.
(b) Discuss the bleeding of concrete and Enlist the remedies for bleeding. 04
(c) Define the shrinkage. What are the factors affecting it and their remedial 07
measures?
OR
Q.3 (a) Write a short note on the segregation of concrete. 03
(b) List the different types of chemical admixtures and explain any one in 04
detail.
(c) Enlist different types of Mineral admixtures. Explain the fly ash in detail. 07

Q.4 (a) Describe the factors affecting the alkali-aggregate reaction. 03

(b) Write a short note on self-compacting concrete. 04
(c) List the factors affecting the strength of concrete & describe each one in 07
detail.
OR
Q.4 (a) Explain the importance of compaction of concrete. 03
(b) List the external and internal factors affecting the durability of concrete, 04
and explain how permeability and concrete cover influence durability.
(c) List out various tests of workability. Explain the slump cone test procedure 07
as per the IS code.

Q.5 (a) What are the limitations of a rebound hammer test? Also, mention under 03
which circumstances this method is useful.
(b) Explain in brief about the permeability of concrete. 04
1
 (c) State the different types of special concreting techniques & Explain ready 07
mixed concrete with its merits.
OR
Q.5 (a) What do you understand by the carbonation of concrete? 03
(b) List out the factors influencing the mix proportion of concrete. 04
(c) List the steps for selecting the mix proportion of concrete according to the 07
I.S. code method, and explain any two steps in detail.

*************

2
 Enrolment No./Seat No_____________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–V (NEW) EXAMINATION – SUMMER 2024
Subject Code:3150610 Date:18-05-2024
Subject Name:Concrete Technology
Time:02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

MARKS
Q.1 (a) What is compaction? Why compaction is needed? 03
(b) Write a short note on aerated concrete. 04
(c) Explain about rebound hammer test. 07

Q.2 (a) What are the purposes of admixtures in concrete? 03

(b) Write a short note on bulking of sand. 04
(c) State factors affecting compressive strength of concrete and explain any four 07
in detail.
OR
(c) Explain the factors affecting permeability of concrete. 07

Q.3 (a) State the major compounds of ordinary Portland cement and its importance. 03
(b) Explain different types of slump with sketch. 04
(c) Explain ultrasonic pulse velocity test. 07
OR
Q.3 (a) Explain the effect of water cement ratio on the strength of concrete. 03
(b) Explain importance of grading of aggregates. 04
(c) List various methods of concreting under water and explain ‘tremie’ method. 07

Q.4 (a) Explain mechanism of sulphate attack on concrete. 03

(b) Define Durability. Explain its significance. 04
(c) Explain wet process for manufacturing of cement. 07
OR
Q.4 (a) Explain segregation of concrete. 03
(b) Describe the test for determining standard consistency, and initial setting time 04
of cement.
(c) Explain Indian Standard Mix design method as per IS: 10262 (2009) with its 07
salient features.

Q.5 (a) Explain need of curing. State different methods of curing. 03

(b) Define workability and discuss factors affecting workability. 04
(c) What is self-compacting concrete? And what are the advantages and 07
disadvantages of using it?
OR
Q.5 (a) Briefly explain alkali-aggregate reaction. 03
(b) Differentiate between high-strength and high-performance concrete. 04
(c) Explain various causes of corrosion of steel in concrete and its remedial 07
measures.
*************
1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE – SEMESTER- V EXAMINATION-SUMMER 2023
Subject Code: 3150610 Date: 26/06/2023
Subject Name: Concrete Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

Q.1 (a) What is the effect of water cement ratio on strength of concrete? 03
(b) What is gap grading? Explain briefly. 04
(c) Explain Indian Standard Mix design method as per IS:10262 with its 07
salient features

Q.2 (a) Enlist different types of Cement. 03

(b) Write down Bouge’s compounds of cement. Explain their role in the 04
hydration process.
(c) State the advantages of concrete as a construction material. 07
OR
(c) Explain wet process for manufacturing of cement.

Q.3 (a) Briefly explain Gel-space ratio. 03

(b) What is workability of fresh concrete. Enlist factors affecting workability. 04
(c) Write importance of curing of concrete. Explain different methods of curing 07
procedure.
OR
Q.3 (a) Explain different types of slump with figure. 03
(b) Define: 04
1. Standard Consistency 2. Initial Setting Time
3. Final Setting Time 4. Soundness of Cement.
(c) What is permeability of concrete? Enlist factors affecting the permeability of 07
concrete. Explain any three of them in detail.

Q.4 (a) What is compaction of concrete? What is the significance of compaction in 03

concrete?
(b) Enlist the different admixtures used in concrete construction. Explain the 04
function of accelerator and retarders types of admixtures.
(c) State factors affecting compressive strength of concrete and explain any one 07
in detail.

OR
Q.4 (a) Define Ferro cement briefly. 03
(b) Explain Bleeding in detail. 04
(c) Explain the test for the determination of aggregate crushing value. 07

Q.5 (a) Distinguish between the grade of cement and grade of concrete. 03
(b) State the different types of special concrete techniques. Explain the ready 04
mixed concrete with its classification.
(c) Enlist the types of NDT tests for concrete. Explain the rebound hammer test 07
in detail.
OR
Q.5 (a) State the essential characteristics of water that can be used for mixing and 03
curing of concrete.
(b) How fly ash concrete gain strength in later age? 04
(c) Explain the basic principle on which schmidt rebound hammer works. What 07
are its limitations?
***********
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–V (NEW) EXAMINATION – WINTER 2022
Subject Code:3150610 Date:06-01-2023
Subject Name:Concrete Technology
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

Q.1 (a) Explain segregation and bleeding of concrete. 03

(b) Explain volume batching and weigh batching for concrete mix. 04
(c) Write down the factors affecting the strength of concrete & explain any three 07
in detail.
Q.2 (a) Write chemical composition of Ordinary Portland cement. 03
(b) Define the term “Bulking of fine aggregates”. Explain its significance for in 04
relation to strength of concrete.
(c) Explain the Alkali-aggregate reaction. 07
OR
(c) List factors affecting the permeability of concrete. Explain any three of them 07
in detail.

Q.3 (a) What do you understand by compaction of concrete? Explain “Why 03

compaction is needed?”
(b) Write short note on cold weather concreting. 04
(c) Define durability of concrete? Enlist factors affecting durability of concrete. 07
Explain any three in brief.
OR
Q.3 (a) What is the role of fly ash in cement industry. 03
(b) How can we check cement on site? Why the field testing of cement is 04
important?
(c) Enlist various Non-Destructive tests for assessment of strength of concrete. 07
Explain Rebound Hammer test.

Q.4 (a) Explain in brief about freezing and thawing effect of concrete. 03
(b) Describe the effect of size, shape, texture and grading on concrete. 04
(c) Explain wet process for manufacturing of cement. 07
OR
Q.4 (a) Describe the effect of quantity of Gypsum in cement. 03
(b) Explain different types of slump with appropriate figure. 04
(c) Describe shrinkage of concrete. Giving the classification of shrinkage, explain 07
harmful effects of shrinkage of concrete.

Q.5 (a) Briefly explain Gel-space ratio. 03

(b) List various crack repair techniques and explain any one in detail. 04
(c) Write importance of curing of concrete. Explain different methods of curing 07
procedure.
OR
Q.5 (a) Explain Impact and crushing value of aggregate. 03
(b) Write a note on “Fiber reinforced concrete”. 04

1
(c) What do you mean by Design of concrete mix. Explain the steps for Mix 07
Design Procedure as per relevant Indian Standards.

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