RTU 2016 Question Paper Semester IV Civil Engineering Concrete Technology

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F{ B.rech. rv-sem (Main l'#llr'rxam; June-Ju ty 2016
!t Civil Engineering
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+ 4CEZ A Concrete Technology

Time: 3 Hours Maximum Marks: E0
Min. Passing Marks (Main & Back): 26
Min. Passing Marks (Otd Back): 24
Instructions to Candi.dates : -

Attempt any five questi.ons, selecting one question
from each unit. All
Questions carry equal marks. schematic diagrams must be shown
wherever necessary. Any data you feel missing suitably be assumed and
stated clearly.
units of quantities used/ calculated. must be stated clearly.
use of following supporting material is permitted during examination.
(Mentioned in form No.205)
1. NIL
2. NIL

UNIT-I
Q.l (a) Discuss and compare the role of C3S, C2S AND C3A in governing the various
properties of cement.
t8l
(b) Define workability of concrete. With the help of neat dimensional set up
experiment, describe ,,Slump test,,and its limitations.
l2+4+2=81
OR
Q.1 (a) Differentiate between the followings.
(i) Elongated and flaky aggregates
(ii) Segregation and bleeding of concrete. [2x4=8]

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(b) Describe C-S-H gel. Calculate minimum w/c ratio required for 607o hydration, so

that cement gel just occupies the available space completely t 2+6=8)

Q.2 (a) With the help of neat schematic curve, describe the creep phenomena and its
recovery. Also discuss the factor affecting the creep of concrete. tSl

(b) Describe the principle and method of Rebound Hammer NDT and its

limitations. t8l

On
Q.2 (a) Describe the maturity concept of concrete and its significance. A concrete having
full maturity strength of 325kgtcm2 is used in cold zone at 5oC temperature.
Using Plawman's equation estimate its strength after 15 days. Use coefficient

A=2landB=61. [3+5=8]
(b) List the type of shrinkage of concrete. Describe the plastic shrinkage and discuss
the preventive measures to reduce the plastic shrinkage. [2+3+3=8]

UNIT.III
Q.3 (a) Differentiate between weigh batching and volume batching. With the help of
schematic line diagram explain the batching through "Automatic batching
plant". 14+4=8]

(b) Brief describe the following method of compaction of concrete.
(i) Rodding
(ii) Ramming
(iii) Tamping.
(iv) Compaction through surface vibrators. l2x4=81

[4E4LL2] Page?of[ [e3801

q
Q'3 (a) (i) Describe rhe necessity and important
of c.uring.
(ii) How does the curing temperature affect
the.strength of concrete?
(iii) Describe the steam curing in detail.
[3+3+4=10]
(b) Describe the various steps of mixing
of concrete using tilted concrete
mixer. Arso
describe the term "buttering
of mixer,,.
[4+2=61

UNIT.IV
Q'4 (a) Describe the accelerator admixtures, specifically
on the following points:
(i) purpose & specific situation when
these are to be used.
(ii) Example of commonry used accelerators.
(iii) Their effect on strength of concrere.
[4+2+2]
(b) Discuss the use of fly ash and sirica
fume as admixture in concrete.
I8l
OR
Q'4 (a) Describe the terms "target mean
strength" and .,characteristics
strength of
concrete"' Give the equation
for finding quantity of coarse
aggregate in mix
design by I.S. method, exprain
each and every tefin invorved
in the
equation'
13+4=7)
(b) Different between the following:
(i) Retarder and accelerator admixture.
(ii) Chemical and mineral admixrure.
(iii) Plasticizers and super plasticizers.
[3x3=91
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Q.5 Write short note on the followings:
(a) High strength concrete
- (b) Under water concreting
(c) Self compacting concrete
(d) Slip Form Work [4x4=16]

OR

Q.s (a) Describe the requirement of a good formwork. t61

(b) Describe the salient properties and application of sulphate resisting concrete. tsl

(c) Draw a typical neat-labeled sketch of formwork for R.C.C: beam-slab. tsl

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