Answered: a. Do the amount of RHA affect the…

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

The specific objective of this experiment is to determine how the amount of rice hull ash (RHA) and concrete admixtures additions affect concrete strength. After 28 days of curing, the data is collected and presented below.

Rice Hull Ash Addition (%)	Admixture Addition (%)	Concrete Strength (MPa)
0	0	21.5
0	0	23.4
15	0	27.1
15	0	29.2
30	0	25.0
30	0	34.1
0	0.25	29.0
0	0.25	29.2
15	0.25	29.0
15	0.25	34.2
30	0.25	34.0
30	0.25	31.9
0	0.5	26.9
0	0.5	29.0
15	0.5	29.0
15	0.5	34.3
30	0.5	33.8
30	0.5	34.0

a. Do the amount of RHA affect the compressive strength? How so?

b. Does the admixture affect the compressive strength? How so?

c. How does the variation in RHA and admixture addition affect the compressive strength? Which of them has the stronger influence on the compressive strength?

d. Do we have sufficient evidence to identify an optimum % addition that will result to maximum compressive strength? Support your answer or provide recommendations, if not possible to know the optimum % addition.

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