Maharashtra State Board of Technical Education 2008 Diploma Civil Engineering Concrete Technology - Question Paper
Sunday, 05 May 2013 05:40Web
Sample ques. Paper – I
Course Name :- Civil Engineering Group
Course code :- CE/CR/CS/CV
Semester :- Third
Subject :- Concrete Technology
Duration :- three hours Marks: 80
Instructions :
1) All ques. are compulsory
2) Illustrate your answers with neat sketches wherever necessary.
3) Figures to the right indicate full marks.
4) presume suitable data, if necessary.
Q.1 Attempt any 8 of the subsequent [Marks: 16]
a) State the particle size and percentage of it for standard sand in compressive strength test of cement.
b) Write 1 use of Blast furnace slag cement and white cement.
c) Write 2 disadvantages of rounded aggregates and flaky aggregates.
d) describe apparent specific gravity and absolute specific gravity.
e) State any 2 factors affecting shrinkages of the concrete.
f) State the conditions under which the water cement ratio legal regulations is valid.
g) Write the meaning of “200 NT” concrete mixture.
h) Write the removal time for formwork of slab and column as per IS 456-2000.
i) Why curing of concrete is necessary?
j) State any 2 precautions to be taken at the time of hot weather concreting.
Q.2 Attempt any 3 of the subsequent [Marks: 12]
a) describe normal consistency of cement and state amount of water needed for setting time test and soundness test of cement.
b) Why rapid hardening cement is not used in mass concreting? Why it gains early strength than OPC?.
c) Write IS code procedure for soundness test and state its significance.
d) define the factors affecting the bulk density.
Q.3 Attempt any 3 of the subsequent [Marks: 12]
a) How the grading of coarse aggregates are represented graphically? How coarsest and finer grading is interpreted by the curves?
b) Draw bulking curve of sand and state the precautions to be taken if sand is bulking in case of quantity batching.
c) compute fineness modulus and classify the sand from the fitness of modulus.
Sieve: 4.75mm, 2.36mm, 1.18mm, 600 micron, 300 micron, 150 micron, 75 micron
Weight:15gm, 105gm, 90gm, 200gm, 340gm, 180gm, 70gm
d) State the procedure for impact value and compute impact value for sample of 350 gm of aggregate and fraction passing through IS 2.36 mm sieve as 48 gm.
Q.4 Attempt any 4 of the subsequent [Marks: 16>
a) describe concrete and grade of concrete. Also state where high strength concrete is used.
b) State the water cement ratio legal regulations. discuss with graph. How compressive strength varies with various water cement ratio?
c) Determine the content of coarse aggregate if
(1) the amount of entrapped air is 2%
(2) Water content is 191.6 kg/m3) cement content is 383 kg/m3
(4) Ratio of fine aggregate to coarse aggregate is 0.315
(5) Specific gravity of fine aggregate is 2.6
d) (I) Draw the graph showing relation ranging from compressive strength and age of the concrete. (ii) If compressive strength of concrete cubes at 28 days is 120 N/mm2 for 1:2:4 concrete, decide the suitability.
e) State the precautions to be taken while using rebound hammer. Also state the relationship ranging from rebound number and compressive strength of concrete.
f) Enlist 4 kinds of vibrators with their specific use.
Q.5 Attempt any 3 of the subsequent [Marks: 12]
a) Draw the neat sketch of formwork for well foundation.
b) elaborate the various modes of transportation of concrete?
c) What is the importance of waterproofing? Name any 2 materials used for waterproofing.
d) What is the purpose of curing of concrete? State any 2 methods.
Q.6 Attempt any 3 of the subsequent [Marks: 12]
a) State the precautions to be observed in cold weather concreting.
b) State the special purposes of using the super plasticizers. How does it works?
c) describe fibre reinforced concrete and write any 2 applications.
d) State the manufacturing process of precast concrete. Write 4 precast concrete units.
| Earning: Approval pending. |
