Introduction. Sand is the ideal medium to cast liquid metal into a desired form. First, a suitable sand is mixed with a binder (e. g. resins) and pressed into the desired shape by a machine. A standard parameter to express the size of molding sands is the AFS fineness number (AFS = American Foundry Society).
Though M Sand uses natural coarse aggregates to form, it causes less damage to the environment as compared to river sand. Better quality control since manufactured in a controlled environment. Though M Sand uses natural coarse aggregates to form, it causes less damage to the environment as compared to river sand.
Sand types
| Coral sand | “Coral sand” has several meanings. Find out what it really is. |
|---|
| Gypsum sand | A rare sand type composed of gypsum grains. |
| Ooid sand | Ooids are rounded pellets formed in a shallow wave agitated water. |
| Silica sand | Silica sand is almost pure quartz. |
| Black sand | There are two types of black sand. |
Which Sand is best for House Construction?
- River/Natural Sand: River Sand is usually obtained from River Beds and Banks.
- Manufactured Sand (M-Sand) & Plaster Sand: Manufactured Sand is manufactured by proper crushing of aggregates into finer materials of required particle size (generally using VSI technology).
- Pit Sand:
The colour of cement gives an indication of excess lime or clay and the degree of burning.
- RUBBING. Take a pinch of cement between fingers and rub it.
- HAND INSERTION. Thrust your hand into the cement bag and it should give cool feeling.
- FLOAT TEST.
- SMELL TEST.
- PRESENCE OF LUMPS.
- SHAPE TEST.
- STRENGTH TEST.
Basically river sand are used for any plastering work. Generally, in any plastering work plasterers are used natural sand, crushed stone sand or crushed gravel sand. Though, there is a grading limit of sand which are used in plastering work. Other types of sand will also work, but it could be more expensive to use.
Manufactured sand (M-Sand) is a substitute of river sand for concrete construction. Manufactured sand is produced from hard granite stone by crushing. The crushed sand is of cubical shape with grounded edges, washed and graded to as a construction material. The size of manufactured sand (M-Sand) is less than 4.75mm.
Manufactured sand (M-Sand) is a substitute of river sand for concrete construction . Manufactured sand is produced from hard granite stone by crushing. The crushed sand is of cubical shape with grounded edges, washed and graded to as a construction material. The size of manufactured sand (M-Sand) is less than 4.75mm.
The silt content is the percentage of sand with a diameter < 0.1 mm. If your effective size is below 0.15 mm, that means too much of the sand is very small sand particles. If the silt content is too high (above 4%), the silt will cause the water flowing out of the filter to be cloudy (turbidity).
The required test for sand are as follows,
- Take a glass of water and add some quantity of sand in it.
- For detecting organic impurities in sand, take a container add some quantity of sodium hydroxide or caustic soda and also add small quantity of fine aggregate/sand stir the container.
Crushed stone dust falling within the grading Zone II sand, grading limits specified by IS 383 code and manufactured from the hard rock is suitable as fine aggregate in masonry mortars. Also, IS-2116 and IS 383 codes permit the use of crushed stone fine aggregate in masonry mortars.
Silt Content Test for Sand (Fine Aggregate) - Civilology. Sand plays the vital role in every part of the construction (concrete, plastering, brickwork, flooring).
IS 383 -1970 Code Book PDF free download. This Indian Standard (Second Revision) was adopted by the Indian Standards Institution on 25 September 1970, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council.
Test Procedure
- First, we have to fill the measuring cylinder with 1% solution of salt and water up to 50 ml.
- Add sand to it until the level reaches 100 ml.
- Cover the cylinder and shake it well (as shown in video)
- After 3 hours, the silt content settled down over the sand layer.
Aggregate Tests
- Sulfate Soundness Test. The soundness test determines an aggregate's resistance to disintegration by.
- Fine Aggregate Specific Gravity.
- Triaxial Test.
- Gradation Test.
- Fineness Modulus.
- Particle Index.
- Fine Aggregate Angularity.
- Flat and Elongated Particles.
You can calculate the aggregate of your marks by adding the total marks scored by you of each of your subjects and dividing it by the total number of subjects. This will give you your overall percentage.
The test is done as follow.
- Take required amount of aggregate sample (for coarse aggregate take apprx. 2.5 kg and for fine aggregate take 0.5 kg)
- Arrange the required no of sieves as per the contract or job requirement in an descending manner. (
- Shake vigorously the sieve set for at least 2 minute.
Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Aggregate crushing value is a numerical index of the strength of the aggregate and it is used in construction of roads and pavements.
Various Lab Test On Bitumen. Various Lab Test On Cement. Aggregate Crushing Value. Aggregate Abrasion Value.
Both gravel and crushed stone are generally acceptable for making quality concrete (Photo 9), although gravel is usually preferred for exposed aggregate. The use of recycled concrete, crushed to proper-size concrete aggregate, has also demonstrated successful performance.
Aggregate particles that are cubicle or spherical in shape and correct mineral composition are ideal for maximizing concrete strength. The use of flat and elongated aggregate particles should be avoided or at least limited to a minimum of 15 percent.
Fineness of cement is tested in two ways. By sieving. By determination specific surface by air permeability method.
Bulk Specific Gravity (Bulk Dry Specific Gravity), Gsb.
It is formally defined as the ratio of the mass of a unit volume of aggregate, including the water permeable voids, at a stated temperature to the mass of an equal volume of gas-free distilled water at the stated temperature.Coarse aggregate is the portion of the concrete which is made up of the larger stones embedded in the mix. Concrete contains three ingredients; Water, cement, and aggregate. That aggregate is made of fine sand and coarse gravel.
Bulking Of Sand: The volume of dry sand increases due to absorption of moisture. These volume increase of dry sand is known as bulking of sand. When dry sand comes in contact with moisture, a thin film is formed around the particles, which causes them to get apart from each other.
Sand should be tested for the presence of clay, silt, moisture and other deleterious materials (salts, coal, mica) that may affect the strength of a structure and cause avoidable rework. A good quality construction sand has a particle size measuring about 150 microns to 4.75mm.
The hydrometer method of determining soil texture is a quantitative measurement providing estimates of the percent sand, clay, and silt in the soil. The hydrometer method was developed in 1927 and is still widely used today.
After a prescribed sedimentation period, the height of flocculated clay and height of sand are determined and the sand equivalent is expressed as a ratio of the height of sand over the height of clay. Higher sand equivalent values indicate “cleaner” (less fine dust or clay-like materials) aggregate.
