3- is it possible to shake you sieve set for only 10 minutes?

Ans: Yes, it's possible. The shaking time for most aggregate sample is 10 minutes, the shaking time should be checked after the test, if the shaking time prior the test is not enough, the test should be repeated.

Dams- from Ancient to today
👉 Jawa Dam

The first known dam to be built is the Jawa Dam. Located in modern-day Jordan, the Jawa Dam was originally constructed around 3,000 BC in what was then Mesopotamia. While most ancient dams were simple gravity dams constructed of gravel and masonry, the Jawa Dam was reinforced with rock fill behind the upstream wall in order to protect the wall from water pressure breach. This safety feature was incredibly innovative for this time period. In its prime, the Jawa Dam was 15 feet tall, 80 feet long, with a base of 15 feet. It created the Jawa Reservoir that had a capacity of 1.1 million cubic feet. The Jawa Dam site is arguably the most important archaeological site in the history of large-scale water projects, and the dam itself was so well designed and constructed that the ancient structure stood until just a few years ago, when it was partially ruined due to physical intervention.
#dams

4- How do you choose your sieve trails for the whole test sample? why we can not sieve the whole sample?

Ans: The trail size should be based on the suitable size which prevent the overloading phenomena, the large amount of sample size can not be tested in one operation because overload may occur on some specific sieves especially smaller sieves.

5- What does overloading mean? what is the maximum permissible rate according to ASTM standards? is it depend on mesh area?

Ans: Overloading mean the sieve contain more than the permitted amount of retained material which cause the sampler particle does not get any chance to have a contact with the sieve mesh. The standard permitted retained mass on each sieve according to ASTM should not more than 7 kg per m.sq of sieve mesh.

6- Why you can not randomly prepare the test sample? do you know better methods to prepare you test size?

Ans: the aggregate samples for. Laboratory specimens should be prepared by mechanical splitters or other methods for reducing field samples to testing size in order to avoid segregation.
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7- What does mean the segregation? when you have a segregated sample? how do you avoid them?

Ans: Segregation means the larger and smaller particle of aggregate separate from each other for particular mixing and testing tasks. The segregation occurred for the specific amount of sample separated from the larger amount of sample by hand or other means. To avoid segregation the specific amount of sample for testing amount should be produced by mechanical splitters


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8- How do you know your table of calculation for sieve analysis is correct without double checking?

Ans: if the percent of passing of pan is 0, this means the entire calculation is correct without the need for double checking.

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Formwork
Formwork, sometimes known as shuttering or casing, is the temporary or permanent molds into which concrete or similar materials are poured. It is often confused with the term 'falsework' which is the complete structure erected to support the shuttering molds.
some of the common types of formwork are:
👉Traditional timber formwork
👉Engineered Formwork System
👉Re-usable plastic formwork
👉Permanent Insulated Formwork
👉Stay-In-Place structural formwork systems.
👉Flexible formwork

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Have you ever seen giant holes in water?

If you did, these giant holes are nothing but one type of spillway known as bell-mouth spillway. A spillway is a structure used to provide controlled release of flows from a dam or levee into a downstream area to help prevent floods from damaging or destroying a dam. Some spillways are designed like an inverted bell so that water can enter all around the perimeter. These uncontrolled spillway devices are also called: morning glory, plughole, glory hole, or bell-mouth spillways. In areas where the surface of the reservoir may freeze, bell-mouth spillways are normally fitted with ice-breaking arrangements to prevent the spillway from becoming ice-bound.
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Position-Autocad (RC-CAD) draftsman / designer

need 4 to 5 persons who are well aware of RC CAD.

Software-RC CAD software must

Exp- 0 to 2 yrs

Salary-15k to 20k

Opening-4 to 5 no

Job location-
Work from home

Note-

Those candidate have knowledge/practice of RC-CAD software only those candidate send CV PLS
Fresher always welcome
AutoCAD candidate not required only RC-CAD software candidate required

Send cv
rajmanesujit@gmail.com
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Irrigation engineering

Irrigation engineering

Irrigation engineering

Irrigation engineering

Understanding Grades of Concrete
.
➡Grades of concrete are defined by the strength
composition of the concrete, and the minimum strength the concrete should have following 28 of initial construction.
*The grade of concrete is
understood in measurements of MPa, where C stands for compressive strength and the MPa denotes the overal strength.
*Concrete mixes are defined in ascending numb
of 5, starting at 10, and show the compressive
strength of the concrete after 28 days. For inst
C-10 has the strength of 10 newtons, C-15 has t
strength of 15 newtons, C-20 has 20 newtons
strength and so on.
*Different mixes (M) come in various mix proportions of the various ingredients of cement sand and coarse aggregates. For instance, C-20 comes in the respective ratio of 1:2:3
.
*Generally :-👇
▶C-5 used for Lean concreat
.
▶C-10 Used for: Patio slabs, pathways and non structure work
.
▶C-15 Used for: Pavement kerbs and floor blinding(Ground Slab)
.
▶C-20 Used for: Domestic floors and foundations (with the weight of structure will be lighter). *Also go for workshop bases, garages, driveways and into floor slabs.
.
▶C-25 Used for: Construction in all areas. Multi-purpo concrete mix, usually used for foundations.
.
▶C-30 Used for: Pathways and roadways (this is the
lowest grade concrete mix that can be used for purpose).
More durable than the grades that come before, and thus is much more weather- resistant and can take heavy road traffic.
.
▶C-35 Used for: Commercial structures. This heavy concrete mix is usually used for creating extern walls and slabs, as well as for structural piling.
.
▶C-40 Used for:
Commercial construction sites, foundations and beams for structural support a*roads.
✔️The most durable in this list, C-40 can withstand chemical corrosion also, so is frequently used on farms where slurry could corrode structures, or in septic tanks.

The Street Canyon Effect
Wind is one environmental factor that should be considered in the design of tall buildings. And its effect varies in different areas depending on the location or obstructions in the area. In urban cities full of skyscrapers, the normal wind effect such as its speed or direction may be affected due to the the street canyon effect.
Here is an article on it

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Advanced Waste Treatment:
Any process of water renovation that upgrades treated wastewater to meet specific reuse requirements. May include general cleanup of water or removal of specific parts of wastes insufficiently removed by conventional treatment processes. Typical processes include chemical treatment and pressure filtration. Also called TERTIARY TREATMENT.
#importantTerms
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