Answered: . Determine the compressive strength of…

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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Question

Three concrete mixes with the same ingredients, except the amount of mixing water, and their slump values were obtained. Three 150 mm * 300 mm concrete cylinders were prepared for each mix. The cylinders were cured for 7 days and then tested for compressive strength. The test results are as shown. Assume that the aggregate was at the saturated surface-dry condition before adding mixing water.
It is required to do the following:
a. Determine the compressive strength of each cylinder after 7 days.
b. Determine the average compressive strength of each mix after 7 days.
c. Determine the w/c ratio for each mix.

Weight Weight
of
of
Average
Compressive Compressive
Mix Cement Water * Slump Cylinder Maximum Strength after Strength after
7 Days (psi)
No.
(Ib)
(Ib)
(in.)
No.
Load (Ib) 7 Days (psi)
1
31255
24626
1
35
17.5
1.75
44247
4
25354
38276
1
27601
2
26047
35
19.25
2.25
3
27874
4
22400
5
20300
1.
16177
17668
3
20440
3
35
21
3.00
4
17745
5
17367
Assume that the water listed here is above the saturated surface-dry (SSD) condition

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