Final answer:
Plotting the grading curve for coarse aggregates involves creating a graph with sieve sizes on the x-axis and the percentage passing on the y-axis, then plotting weight percent data and connecting these points with a smooth curve.
Step-by-step explanation:
To plot the grading curve for the grading limits of coarse aggregates, you first need to understand the concept of a sieve analysis or gradation test which determines the particle size distribution in a sample. In the context of aggregates used in concrete or road construction, the grading curve is typically a graph that shows the different particle sizes on the x-axis and the percentage passing through on the y-axis.
Steps for Plotting the Grading Curve
- Start by labeling your graph axes, with the x-axis representing the sieve sizes and the y-axis representing the percentage passing.
- Mark the sieve sizes on the x-axis, often on a logarithmic scale to accommodate the wide range of particle sizes.
- For each sieve size, plot the corresponding weight percent of aggregate that passed through the sieve on the y-axis.
- After marking all the points, draw a smooth curve that best fits the plotted points, connecting them.
- This curve should start at 100% at the largest aggregate size and should decrement, ending at 0% where no particles pass through the smallest sieve size.
To analyze the curve, look for various characteristics such as uniformity and workability, which are informed by the shape and slope of the grading curve. Engineers use these analyses to determine the suitability of the aggregate for different construction purposes.