Specific Gravity & Water Absorption of Coarse Aggregate

This construction video tutorial is useful for concrete mix design. This video tutorial is based on specific gravity and water absorption of course aggregate.

Different types of apparatus like weighing balance, thermostatically controlled oven, glass vessel, enamel tray, air tight container, 10 mm IS sieve, sample are required for this purpose.

The following methods are used :-

Sieve the sample with the help of 10 mm sieve to eliminate thinner particles and then select 1 kg sample. Set the sample in a glass vessel and load the vessel partially with water.

Retain the sample for 24 hours in order that these are fully soaked.

After completion of 24 hours, load the vessel entirely and cover the vessel by disc to resist entrapping of air into vessel. Dehydrate the vessel from outside. Now measure the weight.

Weight of vessel with disc + water + sample (A) = 3372 gms.

Discharge the water of vessel. Now aggregates are set on a dry cloth unless it comes in SSD (surface saturated dry) condition. Now take the weight as C = 990 gms.

Now load the vessel fully with water. Cover the vessel with disc so that no air can enter into it. Now, again take the weight.

Weight of vessel together with disc and water (B) = 2574 gms.

Now, put the SSD sample in a tray made of enamel and retain it in oven at 1000C for 24 hours. Once 24 hours are completed, let the sample cool in air tight container.

Now, take the weight of the oven dry sample as D = 982 gms.

The following formula is used to determine the specific gravity :-

D/C-(A-B), here, A denotes weight of vessel with disc + water + sample = 3372 gms
B denotes weight of vessel with disc + water = 2754 gms

C denotes weight of SSD sample = 990 gms
D denotes weight of oven dry sample = 982 gms

To determine water absorption, use the following formula :-
C-D/D x 100 = 990 – 982/982 x 100 = 0.81%

To get more detail information, go through the following video tutorial.



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Published By
Rajib Dey
www.constructioncost.co
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7 Prime liabilities of a Civil Site Engineer in a Building Construction Project

A site civil engineer takes lots of responsibilities as per the company’s rules and structure of the project management team. Given below, the complete liabilities of a civil site engineer :-

1. Accomplishment of the project in due course: The key liability of the project management team is to deliver the project in scheduled time. A site civil engineer has also to take this liability as he is the part and parcel of the project management team.

To accomplish a building construction project timely, a project management team has to take responsibility to make a “master Schedule” for the project. In this regard, the project manager should take the sole liability.

It is necessary to create the master schedule on the basis of the company’s rule. Now, the monthly and weekly target of the project will be determined on the basis of master schedule.

If it becomes easier to monitor each construction task on weekly basis, there will be no obstacles for the project to be accomplished in due course.

Therefore, the tasks given below should be undertaken to finish a building construction project in due course –:

• Create master schedule for the project
• Make a monthly plan on the basis of the master schedule
• Arrange weekly target on the basis of monthly target
• Monitor weekly target every day

2. Ensuring Contractor Selection on Time: Lots of tasks should be performed in a building construction project. Such as Civil works, Plumbing works, Electrical works, Painting works, etc.

All of these works should be executed with individual contractors. As for instance, the civil contractor should only perform the civil works like RCC and masonry works. Plumbing contractor performs sanitary and plumbing work and tiles contractors should accomplish the tiles work on a building construction project.

Although, the project manager takes the responsibility for the selection of the contractors, a site civil engineer should also assist the project manager to accelerate the selection process for the diverse work item of the project.

Check the project’s master schedule. When it is required to commence the next work phase, call for the next contractor prior to one month for executing the next task.

As for instance, if planning is made to commence tiles work after one month, enquire for tiles contractor from today.

A site civil engineer should take the liability to make sure the convenient work progress of the project. Therefore, call for desired contractors a month earlier than your master schedule to maintain smooth work progress.

Undertake the following tasks to make sure the selection of contractor on time –

• Study your project’s master schedule
• Determine when you are planning to commence next construction task
• Start enquiring of the contractor a month prior to start the actual task.

3. Ensuring Material Delivery on Time: The civil site engineer is liable for providing construction material on time to maintain the flow of construction work progress devoid of any shortage of materials.

For this purpose, don’t give order for all the necessary materials at a time rather order only those materials which are necessary on immediate basis.

Suppose you are going to develop a 2nd-floor slab and mild steel bar is required for that slab only. But if you give order for Rod for 3rd-floor slab also, a huge amount of money will be blocked unnecessarily which can be utilized for other purpose. It will not be so cost-effective.

So, the order should be given for materials which are only required.

So, the following tasks should be undertaken for making sure the delivery of materials on time – not before the time :-

• Workout the necessary materials for the task to executed next
• Make requisition for the materials. Specify material delivery date on the purchase requisition.
• Dispatch the requisition to purchase department on time. In a company, some times are required for approval of the purchase requisition. In this regard, some formalities are required. So, ensure that lead time is retained for the material delivery.
• Monitor the requisition in order that the delivery date of the materials is not missed out.

To get more information, go through the following link acivilengineer.com

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Published By
Rajib Dey
www.constructioncost.co
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Building a Foundation for a new house

This is an excellent video published by Barstow Construction. After demolishing the old house, excavating the lot to clear clay, and backfilling with 1' of recycled sand - we are ready to start our foundation for the new house... Here is how we do it!.

There are three main foundation types: full basement, crawlspace, and slab-on grade. Different types are popular in different parts of the country, with reasons that include ground conditions and local market expectations.

Watch the Video:

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Published By

Rajib Dey

www.quantity-takeoff.com

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How to become a General, Building or Residential Contractor

Learn how to become a Florida State Certified General Contractor in this systematic video. You will learn how to get your general contractors license and how Gold Coast School of Construction will help you get ready for the state exam.

Learn more at 1-800-732-9140 or visit us online at www.goldcoastschools.com.

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Published By

Rajib Dey

www.quantity-takeoff.com

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