Building Contractor Secrets: July 2016

Wednesday, 20 July 2016

How To Calculate the Quantity of Materials (Sand and Cement) Required for 1 Cubic Meter of Cement Mortar

Sometimes on site, we are faced with the problem of calculating for the amount of materials (sand and cement) required in plastering or rendering! This Post is made to tackle this issue!

Today, i want to talk about how you can calculate the quantity of sand and cement required in Mortar

As we all know, Mortar used in Plastering is mixed or produced in different proportions which could include: 1:1, 1:2, 1:3, etc. But here i would like to adopt the 1:6 proportion and do analysis based on this proportion.


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Wednesday, 6 July 2016

Quantities Needed For A Cubic Meter Of Concrete

Quantity of materials such as cement, sand, coarse aggregates and water required per cubic meter of concrete  and mortar varies with the mix design of the concrete and mortar respectively. Following table gives the estimated quantity of materials required per cubic meter of mortar and concrete for various nominal mixes.
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Difference Between Tender Documents And Contract Drawings

To understand the difference between tender documents and contract documents, first we have to understand what these documents contain.

Tender Documents:

A tender is an offer in writing to contractors to execute the some specified works or to supply specified materials within a fixed time frame and as per conditions of contract and agreement between the contractor and the owner or the department or the party.
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How To Calculate Soil Bearing Capacity And Types Of Bearing Capacity Of The Soil

The bearing capacity of soil is defined as the capacity of the soil to bear the loads coming from the foundation. The pressure which the soil can easily withstand against load is called allowable bearing pressure.

Following are some types of bearing capacity of soil:

Ultimate bearing capacity of soil (qu)

The gross pressure at the base of the foundation at which soil fails is called ultimate bearing capacity.
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Dampness In Buildings: Causes, Preventive Measures And Effects On a Building

Dampness in a simple term is when excess water molecule is on building which results to visible growth of mould and destruction or disturbance of wall surfaces and materials. At this stage, you begin to observe the presence of moisture on the body of a building, usually inside, a little below the window level.

You can easily see this when you raise the carpet and notice presence of water under it

Possible Causes Of Dampness In A Building

1 Rain– If the roof is not well constructed to take out water rain, it may lead to dampness on walls due to leakages down from roof to wall.
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Rope Method In Setting Out A Building

A line has to be set out perpendicular to the base line from peg (A). Peg (A) is not on the base line.
A long rope with a loop at both ends and a measuring tape are used. The rope should be a few metres longer than the distance from peg (A) to the base line.
Step 1
One loop of the rope is placed around peg (A). Put a peg through the other loop of the rope and make a circle on the ground while keeping the rope straight. This circle crosses the base line twice (see Fig. 22a). Pegs (B) and (C) are placed where the circle crosses the base line.
Step 2
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How To Set-Out The Corners Of A building

What is setting out? It is the process of developing the physical positions of corners and walls of a building, and it’s done by transferring dimensions from the layout plan to the ground.
It Can be likened to Transferring what has been drawn by the architect or Draftsmen To the actual ground. it is during this stage that the client actually gets the feeling of responsibility
Setting out is done when building a new house, or when renovating an already existing one, especially an extension. The process of Setting out is done by a contractor, and overseen by the lead project consultant engineer, architect or any other qualified member of the project team.
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