The results of a laboratory experiment to evaluate the effects of a plasticizer are shown below. a. Calculate the water-cement ratio in each of the three cases. b. Using water reducer, how can we increase the compressive strength of concrete without changing workability? Refer to the appropriate case in Table P6.32. c. Using water reducer, how can we improve workability without changing the compressive strength? Refer to the appropriate case in the table. TABLE P6.32 With Water Reducer Without Water Reducer Case 1 Case 2 Case 3 Cement content, kg/m³ 815 815 815 734 Water content,* kg/m³ 446 446 355 402 Slump, mm 50 100 50 50 Compressive strength, MPa 37.8 38.0 46 37.9 *Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate. d. Using water reducer, how can we reduce cost without changing work- ability or strength? (Assume that the cost of the small amount of water reducer added is less than the cost of cement.) Refer to the appropriate case in the table. e. Summarize all possible effects of water reducers on concrete.
The results of a laboratory experiment to evaluate the effects of a plasticizer are shown below. a. Calculate the water-cement ratio in each of the three cases. b. Using water reducer, how can we increase the compressive strength of concrete without changing workability? Refer to the appropriate case in Table P6.32. c. Using water reducer, how can we improve workability without changing the compressive strength? Refer to the appropriate case in the table. TABLE P6.32 With Water Reducer Without Water Reducer Case 1 Case 2 Case 3 Cement content, kg/m³ 815 815 815 734 Water content,* kg/m³ 446 446 355 402 Slump, mm 50 100 50 50 Compressive strength, MPa 37.8 38.0 46 37.9 *Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate. d. Using water reducer, how can we reduce cost without changing work- ability or strength? (Assume that the cost of the small amount of water reducer added is less than the cost of cement.) Refer to the appropriate case in the table. e. Summarize all possible effects of water reducers on concrete.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:The results of a laboratory experiment to evaluate the effects of a plasticizer
are shown below.
a. Calculate the water-cement ratio in each of the three cases.
b. Using water reducer, how can we increase the compressive strength of
concrete without changing workability? Refer to the appropriate case in
Table P6.32.
c. Using water reducer, how can we improve workability without changing
the compressive strength? Refer to the appropriate case in the table.
TABLE P6.32
With Water Reducer
Without Water Reducer
Case 1 Case 2 Case 3
Cement content, kg/m³
815
815
815
734
Water content,* kg/m³
446
446
355
402
Slump, mm
50
100
50
50
Compressive strength, MPa
37.8
38.0
46
37.9
*Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate.
d. Using water reducer, how can we reduce cost without changing work-
ability or strength? (Assume that the cost of the small amount of water
reducer added is less than the cost of cement.) Refer to the appropriate
case in the table.
e. Summarize all possible effects of water reducers on concrete.
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