The construction company is going to undertake a concrete jacketing retrofitting work for a pedestrian bridge located in a busy street at the middle of town. The retrofitting work should be completed immediately so as not to disturb the road traffic without compromising the strength of concrete. Choose and explain the suitable type of cement to suit with the construction purpose APPENDICESTable 1.0: Approximate compressive strength of concrete mixes made with a free-water/cement ratio of 0.5Type of cementType of coarseaggregateCompressive strength* MPa at the age of(days):2837912249OrdinaryPortland (TypeII)Uncrushed3042Crushed27364956Sulphate-resistingPortland (TypeV)Rapid-hardeningPortland (TypeII)Uncrushed29374854Crushed34435561Table 2.0: Approximate free water contents required for various level of workabilityaccording to the 1988 DOE method (Source : Neville, A.M., 1995, p: 765)AggregateМах.sizeWater content, kg/m³ for:0- 10ТурeSlump,10 – 3030 – 6060 – 180mmVebe test,>126 - 123 - 60-3mm10Uncrushed150180205225180205CrushedUncrushed23025020135160180210195CrushedUncrushed19014017022540115160175Crushed155175190205 Table Q31Characteristic compressive strength at 7 days40 MPa2.5% (k=1.96)40 mm2Proportion defective3Maximum aggregate sizeAggregate type :Coarse aggregateFine aggregateSlump requiredRelative density of aggregateGrading of fine aggregate-percentage passing 600µm 75%sieve4crusheduncrushed90 mm2.657Maximum free-water cement ratioMinimum cement content80.59300 kg/m356

Retrofitting Work: It refers to application of new technologies to an existing system. Retrofitting…

Answered: The construction company is going to…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The construction company is going to undertake a concrete jacketing retrofitting work for a pedestrian bridge located in a busy street at the middle of town. The retrofitting work should be completed immediately so as not to disturb the road traffic without compromising the strength of concrete. Choose and explain the suitable type of cement to suit with the construction purpose

APPENDICES
Table 1.0: Approximate compressive strength of concrete mixes made with a free-
water/cement ratio of 0.5
Type of cement
Type of coarse
aggregate
Compressive strength* MPa at the age of
(days):
28
3
7
91
22
49
Ordinary
Portland (Type
II)
Uncrushed
30
42
Crushed
27
36
49
56
Sulphate-
resisting
Portland (Type
V)
Rapid-hardening
Portland (Type
II)
Uncrushed
29
37
48
54
Crushed
34
43
55
61
Table 2.0: Approximate free water contents required for various level of workability
according to the 1988 DOE method (Source : Neville, A.M., 1995, p: 765)
Aggregate
Мах.
size
Water content, kg/m³ for:
0- 10
Турe
Slump,
10 – 30
30 – 60
60 – 180
mm
Vebe test,
>12
6 - 12
3 - 6
0-3
mm
10
Uncrushed
150
180
205
225
180
205
Crushed
Uncrushed
230
250
20
135
160
180
210
195
Crushed
Uncrushed
190
140
170
225
40
115
160
175
Crushed
155
175
190
205

Table Q3
1
Characteristic compressive strength at 7 days
40 MPa
2.5% (k=1.96)
40 mm
2
Proportion defective
3
Maximum aggregate size
Aggregate type :
Coarse aggregate
Fine aggregate
Slump required
Relative density of aggregate
Grading of fine aggregate-percentage passing 600µm 75%
sieve
4
crushed
uncrushed
90 mm
2.65
7
Maximum free-water cement ratio
Minimum cement content
8
0.5
9
300 kg/m3
56

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