Weekly Review Report- 05
Submitted by- Rajesh Sharma Arghya (ID- 1904148)
Submitted to- Dr. S M Faisal Mahmood
Johora et. al [1] demonstrated a correlation between the measured ultrasonic pulse
velocity and compressive strength of concrete. The experimental procedure involved casting
concrete specimens using various coarse aggregates, including stone, brick, recycled stone and
recycled brick. The study assessed the influence of coarse aggregate type, the impact of
saturated condition and the effect of air-dry condition on the correlation between ultrasonic
pulse velocity and compressive strength. A summary of statistical significance is shown in the
table below:
Type of aggregate
Equations
Brick
Recycled brick
Stone
Recycled stone
y = -69.395 + 0.023268x
y = -32.315 + 0.012657x
y = -100.08 +0.026246x
y = -60.689 + 0.018328x
Co-efficient of
determination
𝑅2= 0.9552
𝑅2= 0.515
𝑅2= 0.615
𝑅2= 0.697
Table 1: Equation and co-efficient of determination for different coarse aggregate
Pearson
Coefficient (t)
𝑅2
Brick
0.977
𝑅2= 0.955
y= -69.395 + 0.023268x
Strong
Recycled Brick
0.718
𝑅2=0.515
y= -32.315 + 0.012657x
Strong
Stone
0.783
𝑅2= 0.613
y= -100.09 + 0.026148x
Strong
Aggregate
Type
Equation
Correlation
Recycled
0.835
y= -60.689 + 0.018328x
Strong
𝑅2= 0.697
stone
Table 2: Summary of statistical analysis of ultrasonic pulse velocity for saturated condition
Aggregate
Pearson
Equation
Correlation
𝑅2
Type
Coefficient (t)
Brick
0.739
𝑅2= 0.544
y= -95.576 + 0.034022x
Moderate
Recycled
brick
0.906
𝑅2=0.821
y= -121.87 + 0.043461x
Strong
Stone
Recycled
stone
0.739
0.518
𝑅2= 0.546
𝑅2= 0.268
y= -61.19 + 0.022659x
y= -29.775 + 0.014517x
Moderate
Moderate
Table 3: Summary of statistical analysis of ultrasonic pulse velocity for air dry condition
From the above summary, it can be concluded that, the relation between compressive strength and
ultrasonic pulse velocity is complicated and different aggregates behave differently in different
conditions. While the proposed equations demonstrate statistical significance, it is imperative to
underscore the necessity for an extensive study to elucidate and establish a more refined
correlation between ultrasonic pulse velocity and compressive strength.
References:
[1]
Johora FT, Toufiq Amin CM, Ibrahim SM, Haque A, Saiful Amin A. MEASUREMENT
OF ULTRASONIC PULSE VELOCITY IN CONCRETE FOR ASSESSING
COMPRESSIVE STRENGTH. 2015.