Name of the College : Ganesh College of Engineering
University : Anna University
Subject Code/Name : CE 2203 Construction Techniques, Equipment and Practice
Dept : Civil Engineering
Degree : BE
Sem: III
Website : ganeshenggcollege.org
Document Type : Question Bank
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/ganeshenggcollege.org/3356-ce2203-qb.pdf
Ganesh Engg Construction Techniques, Equipment & Practice
UNIT – I : CONCRETE TECHNOLOGY
PART – A :
Related : Ganesh College of Engineering CE2303 Railways Airport & Harbour Engineering BE Question Bank : www.pdfquestion.in/3357.html
TWO MARK QUESTIONS AND ANSWERS :
1. What are the properties of cement?
i) It gives strength to the masonry
ii) It gives an excellent binding material
iii) It is easily workable
iv) It is posses a good plasticity
v) It is stiffness or hardness early
2. What are ingredients used in production of cement?
i) Silica
ii) Lime
iii) Alumina
iv) Sulphur trioxide
v) Iron oxide
vi) Magnesium oxide
3. What are types of cement?
i) Acid-based cement
ii) Blast furnace cement
iii) Colored cement
iv) High alumina cement
v) Ordinary Portland cement
vi) Rapid hardening cement
vii) Sulphate resisting cment
viii) Water proof Portland cement
ix) Low heat Portland cement
x) Water repellent cement
xi) Expanding cement
xii) Portland pozzolana cement
xiii) Quick setting cement
4. State the functions of the ingredients of Portland cement?
** Cao – controls strength and soundness, its deficiency reduces strength and setting time.
** Si O2 – gives strength, excess of it causes slow setting
** Al2 O3 — responsible for quick setting if in excess, it lowers the strength.
** Fe2O3 – gives color and helps in fusion of different ingredients.
5. What are the tests to be conducted to ensure the cement supplied at the site is good?
** Physical test
** Sieve method
** Air permeability test
** Wagner turbidity test
** Consistency test
** Soundness test – Le-chatlier method
** Strength test
** Compressive strength
** Tensile strength
6. What is the purpose of adding admixture in concrete?
** To improve the strength of concrete
** To accelerate the initial setting of concrete
** To retard the initial set
** To improve workability
** To inhibit the corrosion of concrete
** To increase the durability of concrete
** To increase the resistance to chemical attack.
7. What are the factors that affect workability of concrete?
Factors that affect workability of concrete are
** Water content
** Micro proportions
** Size of aggregates
** Shape of aggregates
** Surface textures of aggregate
8. What are the tests to find the workability of concrete?
Workability of concrete can be determined by
** Slump test
** Compacting factor test
** Flow test
** Kelly ball test
** Vee bee test
9. What are methods adopted in compaction?
** Hand compaction
** Rodding
** Ramming
** Tamping
** Compaction
** Internal vibrator
** Form work vibrator
** Table vibrator
** Platform vibrator
** Surface vibrator (screed vibrator)
** vi)Vibratory roller
** Compaction by pressure and jolting
** Compaction by spinning.
10. What are the characteristics of good concrete?
** It should have high compressive strength. The compressive strength should not be less than 15.5 N/ mm2.
** On hardening, it should exhibit minimum shrinkage.
** It must be adequately dense. The density of a good concrete should be about 24 kN/m3.
** It must be adequately durable to resist the effects of weathering agencies.
** It should have minimum creep
** It should have minimum thermal expansion so as to provide good resistance to fire.
11. What do you mean by the term “Workability”?
The quality of concrete satisfying the requirements like concrete without segregation, for placing without loss of homogeneity, compacting properly, presence of certain quantity of water is termed as workable concrete.
12. What are the factors that affect the workability of fresh concrete?
** Water content
** Mix proportion
** Size of aggregates
** Shape of aggregates
** Surface texture of aggregates
** Grading of aggregates
** Use of admixtures