Aggregate Abrasion Test Procedure
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Questions and Answers

How is the abrasive charge chosen for the Los-Angeles test?

Depending upon the aggregate

How many revolutions are required for grading A, B, C, and D in the Los-Angeles test?

500 revolutions

What is the maximum allowable abrasion value for the W.B.M subsurface course in the Los-Angeles test?

60

What size sieve is used in the Los-Angeles test to determine percentage wear?

<p>1.7mm IS sieve</p> Signup and view all the answers

How many spheres are used for grading E, F, and G in the Los-Angeles test?

<p>12</p> Signup and view all the answers

How is the material discharged from the Los-Angeles test machine?

<p>Taking care to take out entire stone dust</p> Signup and view all the answers

What is a strap footing?

<p>A strap footing is when the independent footings of two columns are connected by a beam.</p> Signup and view all the answers

When are continuous footings used?

<p>Continuous footings are used when a footing is common to more than two columns in a row.</p> Signup and view all the answers

What are the two types of R.C.C. footings mentioned?

<p>The two types of R.C.C. footings mentioned are One way reinforced footings and Two way reinforced footings.</p> Signup and view all the answers

In which direction are the main reinforcements placed in One Way Reinforced Footings?

<p>In the transverse direction of the wall.</p> Signup and view all the answers

When are Inverted Arch Footings typically used?

<p>Inverted Arch Footings are typically used for multi-storeyed buildings in olden times.</p> Signup and view all the answers

Why are strap footings necessary when the distance between columns is great?

<p>Strap footings are necessary because combined trapezoidal footings become quite narrow with high bending moments.</p> Signup and view all the answers

What are the requirements of good building stones?

<p>Good building stones should be hard, durable, free from weathering, and have uniform texture.</p> Signup and view all the answers

Explain the dressing of stones.

<p>Dressing of stones is the process of smoothing and shaping the stones for construction purposes.</p> Signup and view all the answers

What are the requirements of good building bricks?

<p>Good building bricks should have uniform color, be well burnt, have sharp edges, and emit clear metallic sound when struck.</p> Signup and view all the answers

What are the tests conducted on fine aggregates and explain briefly?

<p>Tests on fine aggregates include sieve analysis, specific gravity, and water absorption tests.</p> Signup and view all the answers

Explain the needs or importance for conducting soil investigation.

<p>Soil investigation is important to determine soil properties, assess foundation requirements, and ensure stability of structures.</p> Signup and view all the answers

What is the safe bearing capacity of soil and how can it be improved?

<p>Safe bearing capacity is the maximum pressure a soil can safely carry. Methods to improve SBC include soil stabilization, using deep foundations, and ground improvement techniques.</p> Signup and view all the answers

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