CONCRETE POURING ANALYSIS OF LANKA ELECTRICITY COMPANY (PVT)LTD
HEAD OFFICE PROJECT AT COLOMBO.
Client
Lanka Electricity Company (Pvt)Ltd.
Consultant
University of Moratuwa.
Contractor
Sripali Constructions (Pvt)Ltd.
RMC supplier
Capital RMC (Pvt)Ltd.
Concrete Pouring summary. The initial order was placed on 11th of January 2024 by the contractor
representative / Site Engineer for a C30 quantity of 115 m3 with the pump car to the site at 02.00pm,
later the job was cancelled and postponed to 12th of January 2024 at 3.00 am due to unsuitable
weather condition. The pump car was at the site by 2.30am with the coordination of the contractor
representative / Site Engineer and RMC Staff (Executive Engineer, QA/QC Engineer, Technical Sale
Representative). Bellow table provides the summary of the total concrete session.
Time analysis
No
Remark
1
2
3
4
5
6
7
8 Slump Drop
9
10 Rejected
11
12
13
14
15
Truck no
LL 9089
LL 9588
LL 9596
LL 9088
LL 9597
LL 9594
LL 9089
LL 9588
LL 9090
LL 9596
LL 9594
LL 9089
LL 9588
LL 9597
LL 9596
Plant
Depature
Travelling
duration
from Plant
to Site
Arrival to
Site
truck
idealing
before at
the pump
4:05
4:47
6:22
6:48
7:12
7:32
7:49
8:30
9:37
9:57
13:26
13:46
16:50
17:58
19:01
0:40
0:43
0:48
0:42
0:43
0:38
0:56
0:45
0:53
0:53
0:49
0:49
0:55
0:52
0:45
4:45
5:30
7:10
7:30
7:55
8:10
8:45
9:15
10:30
10:50
14:15
14:35
17:45
18:50
19:46
0:00
0:30
0:00
0:35
1:00
1:20
1:40
2:11
2:00
2:25
0:15
2:25
0:05
0:00
0:00
Table 1
Truck at
slump
start
Pump
preparaion Unloading
before the
time
(Pump)
slump test
4:45
6:00
7:10
8:05
8:55
9:30
10:25
11:26
12:30
13:15
14:30
17:00
17:50
18:50
19:46
0:50
0:10
0:03
0:05
0:05
0:03
0:08
0:24
0:05
0:35
1:35
0:05
0:05
0:05
0:04
5:35
6:10
7:13
8:10
9:00
9:33
10:33
11:50
12:35
13:50
16:05
17:05
17:55
18:55
19:50
Time analysis (Source -Dispatch Notes )
Pumping
Duration
finish
unloading
(Pump)
0:23
0:55
0:39
0:35
0:25
0:47
0:50
0:30
0:32
0:25
0:45
0:30
0:35
0:34
0:28
5:58
7:05
7:52
8:45
9:25
10:20
11:23
12:20
13:07
14:15
16:50
17:35
18:30
19:29
20:18
Retention
from plant
concrete
depature to Retention from
start
plant depature
unloading
to finish
(slump testing
unloading
point)
1:30
1:53
1:23
2:18
0:51
1:30
1:22
1:57
1:48
2:13
2:01
2:48
2:44
3:34
3:20
3:50
2:58
3:30
3:53
4:18
2:39
3:24
3:19
3:49
1:05
1:40
0:57
1:31
0:49
1:17
ANALYSIS.
TRUCK VS RETENTION TIME
Relevent Final Retention time (hr)
Relevent Initiall Retention time (hr)
Acceptable retention time (3.5hr)
4.5
B
4.18
A
4
C
3.53
3.5
3.34
3.5
3.2
3.3
3.49
3.24
3.19
RETENTION (HR)
3
2.48
2.5
2.18
2.13
2.58
2.44
2.39
2.01
2
1.57
1.53
1.5
1.3
1.23
1.3
1.48
1.4
1.22
1.31
1.17
1.05
1
0.57
0.51
0.49
0.5
0
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH 10TH 11TH 12TH 13TH 14TH 15TH
TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK TRUCK
TRUCK NUMBER
Figure 1 Retention time analysis (source- time analysis Table 01)
•
•
•
The above graph represents the time duration of each truck mixture at the point of inspecting
the slump.
From the 3rd truck to the 8th truck, the graph shows that each truck taken for the slump
inspection is nearing to the 3.5hr retention time limit. This shows an increased delay in poring
for each of these trucks. Major delays were due to break down of pokers, levelling team
lacked knowledge in fixing, clamping and preparing the pipeline, not using level rods and no
pouring plan due to lack of knowledge in levelling.
Above highlighted points A, B and C were nearing to the 3.5hr retention time limit and after
pouring the time durations are reached to 3:50, 4:18, 3:49 respectively