To evaluate the effect of a certain admixture on the flexure strength of con-crete, two mixes were prepared, one without admixture and one with admix-ture. Three beams were prepared of each mix. All the beams had a cross section of 100 mm * 100 mm and a span of 300 mm. A center-point loadingflexure strength test was performed on each beam after 7 days of curing.The loads at failure of the beams without admixture were 26.89, 22.56, and26.40 kN, while the loads at failure of beams with admixture were 32.47,32.49, and 31.06. Determine:a. The modulus of rupture of each beam in GPa.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 addingthe admixture.
To evaluate the effect of a certain admixture on the flexure strength of con-
crete, two mixes were prepared, one without admixture and one with admix-
ture. Three beams were prepared of each mix. All the beams had a cross
section of 100 mm * 100 mm and a span of 300 mm. A center-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 26.89, 22.56, and
26.40 kN, while the loads at failure of beams with admixture were 32.47,
32.49, and 31.06. Determine:
a. The modulus of rupture of each beam in GPa.
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.
Step by step
Solved in 4 steps
