Q3. Three concrete mixes with the same ingredients, except the amount of mixing water, and their slump values were obtained. Three 100 mm * 200 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 in the table below. Assume that the aggregate was at the saturated surface-dry condition before adding mixing water. It is required to do the following: a. Plot the relationship between slump and amount of mixing water for all mixes Comment on the effect of increasing the amount of water on workability. b. Determine the compressive strength of each cylinder after 7 days. c. Determine the average compressive strength of each mix after 7 days. d. Using the Figure below, estimate the compressive strength after 28 days (fc) for each mix. e. Determine the w/c ratio for each mix. Plot the average fc values versus w/c ratios for all mixes. Comment on the effect of increasing the w/c ratio on the compressive strength

Q3. Three concrete mixes with the same ingredients, except the amount of mixing water, and their slump values were obtained. Three 100 mm * 200 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 in the table below. Assume that the aggregate was at the saturated surface-dry condition before adding mixing water. It is required to do the following: a. Plot the relationship between slump and amount of mixing water for all mixes Comment on the effect of increasing the amount of water on workability. b. Determine the compressive strength of each cylinder after 7 days. c. Determine the average compressive strength of each mix after 7 days. d. Using the Figure below, estimate the compressive strength after 28 days (fc) for each mix. e. Determine the w/c ratio for each mix. Plot the average fc values versus w/c ratios for all mixes. Comment on the effect of increasing the w/c ratio on the compressive strength

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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Concept explainers

Types of Concrete

Concrete is the fundamental material used in civil engineering such as building materials for building structures. Concrete is an aggregate mixture of cement, sand, and fine and coarse rock pieces. The cement acts as a binding material that holds the compositions together, sets, and hardens with time. Apart from cement, there are other different types of binding materials used, such as lime concrete, bitumen, asphalt, and so on.

Question

Mix
No.
1
2
3
Mass of
Cement
(kg)
10
10
10
concrete
Compressive strength, % of 28-day
Mass of
Water* Slump Cylinder
(kg)
(mm)
No.
moist-cured
5
5.5
6
150
125
100
* Assume that the water listed here is above the saturated surface-dry (SSD) condition of the aggregate.
75
50
25
40
OL
337
55
75
1
2
3
1
2
3
1
2
3
28
Estimated
Average
Compres-
Compressive Compressive sive Strength
Maximum Strength after Strength after after 28 Days
Load (kN) 7 Days (MPa) 7 Days (MPa) (MPa)
138.2
175.9
136.9
100.7
115.2
113.6
73.3
78.4
76.0
Moist-cured entire time
In air after 7 days
In air after 3 days
In air entire time
90
Age, days
180

Q3. Three concrete mixes with the same ingredients, except the amount of
mixing water, and their slump values were obtained. Three 100 mm * 200 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 in
the table below. Assume that the aggregate was at the saturated surface-dry
condition before adding mixing water.
It is required to do the following:
a. Plot the relationship between slump and amount of mixing water for all mixes.
Comment on the effect of increasing the amount of water on workability.
b. Determine the compressive strength of each cylinder after 7 days.
c. Determine the average compressive strength of each mix after 7 days.
d. Using the Figure below, estimate the compressive strength after 28 days (fc)
for each mix.
e. Determine the w/c ratio for each mix. Plot the average fc values versus w/c
ratios for all mixes. Comment on the effect of increasing the w/c ratio on the
compressive strength

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Thank you so much. Please hand write if possible
A concrete mix includes the following ingredients per cubic meter: a. Cement = 400 kg b. Water = 176 kg c. No admixture Table P6.30 shows possible changes that can be made to the mix ingredi- ents. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same.
3. A concrete mix includes the following ingredients per cubic foot: (14 pts.) = 25 lbs. = 11 lbs. Cement Water No Admixture Table shows possible changes that can be made to the mix ingredients. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same. What WIlII Happen? Ultimate Compressive Strength Cement (Ib) Water (Ib) Admixture Workablity None 25 28 15 11 None Water reducer Water reducer Superplasticizer Air entrainer Accelerator 25 11 25 8. 25 11 25 11 25 11
Standard deviation is 3.6 MPa
(4) Given the information below: • The mixing water content for the required concrete mix is 180 kg/m3; • A water to cement ratio used is 0.5; • Coarse aggregate has a dry-rodded bulk density of 1800 kg/m³, the dry bulk volume of rodded coarse aggregate per unit volume of concrete is 0.69, and the absorption of 0.5%. According to the ACI (American Concrete Institute) procedure for the concrete mix design, determine: (a) How much of cement (kg) is used for a cubic metre of this concrete? (b) How much of dry coarse aggregate (kg) is used for a cubic metre of this concrete? (c) How much of coarse aggregate (kg) on the basis of SSD (saturated surface dry) condition?
In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 27.6 MPa (4000 psi). The compressive strength data shown in Table were collected. Use one system of units only as specified by the instructor.a. Calculate the mean, standard deviation, and the coefficient of variation of the data.b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
Note:hand written solution should be avoided.
A concrete mix includes the following ingredients per cubic meter: Cement%3D400 kg Water=184 kg No admixture Table below shows possible alternatives mix ingredients. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease or approximately the same. What will happen? Cement Water Admixture (kg) (kg) Ultimate compressive Workability strength 400 225 None 449 184 None Water 400 184 Reducer Water 400 128 Reducer 400 184 Super Plasticizer 400 184 Air Entrainer 400 184 Accelerator DFocus