EBK MATERIALS FOR CIVIL AND CONSTRUCTIO
4th Edition
ISBN: 8220102719569
Author: ZANIEWSKI
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 7.38QP
To evaluate the effect of a certain admixture on the flexure strength of concrete, two mixes were prepared, one without admixture and one with admixture. Three beams were prepared of each mix. All the beams had a cross section of 0.15 m by 0.15 m and a span of 0.45 m. The third-point loading flexure strength test was performed on each beam after 7 days of curing. The loads at failure of the beams without admixture were 32.8, 34.5, and 31.7 kN, while the loads at failure of beams with admixture were 39.4, 35.6, and 35.0 kN. Determine:
- a. The modulus of rupture of each beam in MPa.
- b. The average moduli of rupture of the beams without and with admixture.
- c. The percent of increase of the average modulus of rupture due to adding the admixture.
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Chapter 7 Solutions
EBK MATERIALS FOR CIVIL AND CONSTRUCTIO
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