Video Praktikum Pengujian Tanah Sandcone

Summary

This video script explains a comprehensive field test for determining soil compaction. The procedure involves using various tools and materials to measure parameters like sand weight, soil moisture, and dry density. The test aims to calculate the compaction degree of soil, which is essential for construction stability. Through detailed calculations, including the weight of water and sand in the soil, the final result reveals that the soil's compaction degree is 91.17%, falling short of the required 95% standard. This indicates that the soil's density is inadequate for construction purposes.

Takeaways

• 😀 The purpose of the test is to determine the compaction degree of soil in the field, particularly in road construction.
• 😀 Equipment used in the test includes a transparent bottle, funnel, calibrated sand, scale, dish, perforated plat, screw, rubber hammer, trowel, and a flat base plate.
• 😀 The first step in the test involves determining the weight of sand in the funnel and bottle by measuring the bottle's weight before and after adding the sand.
• 😀 The sand should be added to the bottle until the neck of the funnel is full, after which the weight is recorded for calculation purposes.
• 😀 After the sand stops flowing, the bottle and funnel are reversed, and the new weight is recorded to calculate the amount of sand left in the funnel.
• 😀 The next step involves determining the weight of the soil by preparing a dish to collect the soil sample from the field, then measuring its weight before and after excavation.
• 😀 The plate used for excavation is placed flat on the ground, with screws attached to secure it before digging to a depth of 10 cm and measuring the soil collected.
• 😀 The moisture content of the soil is determined by drying three soil samples in an oven for 12 hours and measuring their weight before and after drying.
• 😀 The amount of water in the soil sample is calculated using the difference in weight before and after drying, and the average moisture content is calculated from three samples.
• 😀 The final analysis includes calculating the dry density of the soil, determining the volume of the hole, and computing the compaction degree based on the dry density of the soil in the field compared to the laboratory standard.

Q & A

What is the main objective of the field test described in the script?

The main objective of the field test is to determine the degree of compaction (soil density) in the field, specifically for road pavement construction projects.

What equipment is used in the soil compaction test?

The equipment used in the soil compaction test includes a transparent bottle, funnel, sand, scale, container, perforated evaporating dish, screws, measuring tape, chisel, hammer, rubber mallet, spade, and a flat base plate.

How is the weight of the sand measured during the test?

To measure the weight of the sand, first, the empty bottle and funnel are weighed, recorded as W1. Then, the funnel is filled with sand, and the weight of the filled bottle and funnel is recorded as W3. After that, the bottle and funnel are inverted, and the sand is allowed to flow, then the weight of the sand remaining is recorded as W5.

What is the purpose of using a flat base plate in the procedure?

The flat base plate is used to ensure a level surface for accurate measurements when inverting the bottle and funnel, allowing the sand to settle evenly and ensuring consistent readings for the weights.

How is the moisture content of the soil sample determined?

The moisture content of the soil is determined by weighing the empty evaporating dishes, adding wet soil samples, and then heating them in an oven for about 12 hours. Afterward, the samples are weighed again to calculate the moisture content based on the difference in weight before and after drying.

What is the significance of the calculated average moisture content?

The average moisture content helps in determining the water content in the soil samples, which is essential for calculating the dry density and for evaluating soil compaction in the field.

What is the formula for calculating the volume of the hole where the soil is extracted?

The formula for calculating the volume of the hole is: Volume = W10 / Gp, where W10 is the weight of the sand in the hole, and Gp is the density of the sand.

How is the dry density of soil determined?

The dry density of soil is determined by calculating the weight of dry soil and dividing it by the volume of the hole where the soil was extracted. This helps determine the soil's compaction level.

What is the required degree of compaction according to the standards, and did the tested soil meet this requirement?

The required degree of compaction according to the standard is 95% or higher. However, the tested soil only achieved a compaction level of 91.17%, which is below the standard and indicates inadequate compaction.

What conclusion can be drawn from the soil test results?

The conclusion from the soil test is that the soil did not meet the required compaction standard, as the degree of compaction was 91.17%, below the acceptable 95% threshold, meaning the soil quality for compaction is insufficient.