Table of Contents
What is the limit of silt content in sand?
8%
The maximum quantity of silt in sand shall not exceed 8%.
How is silt content measured?
Firstly, a 50ml solution of 1% salt and water is prepared in the measuring cylinder. The addition of salt increases the settlement time of silt. The sample of sand to be tested is then added to the cylinder until the level reaches 100ml. 50ml of the solution of salt and water is again added to the measuring cylinder.
What happens if silt content is more in sand?
From above results it is observed that sand from pampore with silt content 4.80 %, compressive strength, split tensile strength, and flexural strength is increased as days of curing increased.
What are the tests for sand?
Take a Sample of sand and add it in Sodium Hydroxide [NaOH] Solution, Stir the solution for few minutes, if the color of solution changes to brown, then the sand has organic impurities which are not suitable for construction. Good quality of sand shows lighter color when it is mixed with NaOH solution.
Is code of silt content in sand?
Silt content limit in sand as per IS code is 8%, so this sand we can use for construction purposes.
Is silt a content?
Silt content is a fine material which is less than 150 micron. It is unstable in the presence of water. It is unstable in the presence of water. Excessive quantity of silt, not only reduces the bonding of cement and fine aggregates but also affects the strength and durability of work.
Why silt is bad for concrete?
Silt content (from aggregate) usually lowered the compressive strength of concrete produced from it. According to Cho (2013) , compressive strength of concrete block declined from 5 to 3 MPa, as the silt content of the fine aggregate inclined from 7 to 9%. …
How can you tell the quality of sand in a field?
Here are the way to check the quality of sand (fine aggregates) at the site.
- Rub the sample of the sand with wet palms.
- Take a glass of water and add some quantity of sand and stir the mix.
- To find organic impurities in the sand, you should repeat the above procedure and add caustic soda (salt) in the glass of water.
Which type of sand is best for construction?
Pit sand is a types of sand used in construction that is best used for constructing buildings due to its superior binding property. It is coarse sand that is found 2-3 meters under the ground. It is obtained naturally from deep pits.
How to calculate the silt content of sand?
Silt Content of Sand = (1 cm / 10 cm) x 100 % Silt Content of Sand = 1% So, from above Test and calculations we can say that this sand has 1% silt content. Silt content limit in sand as per IS code is 8%, so this sand we can use for construction purpose.
How often should you test for silt in sand?
The presence of excess quantity (> 8%) of silt in sand reduces the bonding capacity of raw materials and affects the strength and durability of work. It is recommended to conduct silt content test for every 20m 3 of sand.
Why is sand important to a construction site?
Sand or fine aggregate is one of the most important construction materials at any construction site. Its selection should be done very carefully as it contributes to the strength of various important mixtures like concrete, plasters and mortar.