6.32 The results of an experiment to evaluate the effects of a water reducer are shown in Table P6.32. 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 the table. Chapter 6 Portland Cement, Mixing Water, and Admixtures c. Using water reducer, how can we improve workability without changing the compressive strength? Refer to the appropriate case in the table. d. Using water reducer, how can we reduce cost without changing workability 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. TABLE P6.32 Without Water Reducer With Water Reducer 735 368 2 4,100 Case 1 Case 2 Cement content, lb/yd³ Water content,* lb/yd³ Slump, inches 28-Day compressive strength, psi *Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate. 735 368 4 4,105 Case 3 735 294 2 5,055 662 331 2 4,104
6.32 The results of an experiment to evaluate the effects of a water reducer are shown in Table P6.32. 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 the table. Chapter 6 Portland Cement, Mixing Water, and Admixtures c. Using water reducer, how can we improve workability without changing the compressive strength? Refer to the appropriate case in the table. d. Using water reducer, how can we reduce cost without changing workability 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. TABLE P6.32 Without Water Reducer With Water Reducer 735 368 2 4,100 Case 1 Case 2 Cement content, lb/yd³ Water content,* lb/yd³ Slump, inches 28-Day compressive strength, psi *Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate. 735 368 4 4,105 Case 3 735 294 2 5,055 662 331 2 4,104
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:6.32
The results of an experiment to evaluate the effects of a water reducer are
shown in Table P6.32.
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
the table.
Chapter 6 Portland Cement, Mixing Water, and Admixtures
c. Using water reducer, how can we improve workability without changing
the compressive strength? Refer to the appropriate case in the table.
d. Using water reducer, how can we reduce cost without changing
workability 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.
TABLE P6.32
Without Water
Reducer
With Water Reducer
735
368
2
4,100
Case 1
Case 2
Cement content, lb/yd³
Water content,* lb/yd³
Slump, inches
28-Day compressive strength, psi
*Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate.
735
368
4
4,105
Case 3
735
294
2
5,055
662
331
2
4,104
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