Question

The graph shows the typical test result of a property of a building material. Identify the test and the variables represented on the X-axis and Y-axis from the given options.

 

• A. Workability test of concrete; X-Axis: water-cement ratio; Y-Axis: amount of slump
• B. Cube test of concrete; X-Axis: water-cement ratio; Y-Axis: 28-days compressive strength
• C. Ultrasonic pulse velocity test; X-Axis: pulse velocity; Y-Axis: compressive strength
• D. Bulking test of sand; X-Axis: moisture percentage; Y-Axis: percentage increase in volume

Hint:

In the bulking test of sand, moisture content affects the volume of sand. This property is important in concrete mixing and for understanding the compactness of the sand in construction materials.

Answer 1

The Correct Option is D

The presented graph illustrates the characteristic behavior observed during a bulking test of sand. The analysis of this graph proceeds as follows: Step 1: The bulking test of sand investigates the correlation between moisture percentage and the volumetric expansion of sand. Increased moisture content causes sand particles to expand, resulting in a greater volume. This upward trend, as depicted in the graph, is a defining characteristic of the bulking test. Step 2: The X-axis represents the moisture percentage, quantifying the water content within the sand sample. The Y-axis denotes the percentage increase in volume, indicating the extent of volumetric expansion as moisture levels rise. Step 3: The typical curve shape aligns with the phenomenon of sand bulking, where volume increases with escalating moisture up to an optimal point, after which the volumetric increase may stabilize or decline. Conclusion: The accurate identification is (D) Bulking test of sand, with the X-axis signifying moisture percentage and the Y-axis indicating the percentage increase in volume.