Types of Mortar Joint Used to Make Masonry Wall

Liton Biswas | 8/21/2014 | | Be the first to comment!
Everyday we see the masonry wall here and there. Some appealed to us and some not. But did we notice how the joints are formed in wall?

When we make masonry wall we just combine bricks or concrete block with mortar. This mortar can be cement mortar or lime mortar etc. Whichever mortar you use no matter, the mortar joint should be strong, water-tight, good looking and weather resistant.

Read more: Traditional Brick Bond Patterns Used in Masonry Wall Construction 

The thickness of joint should be from 1/4" to 1/2". And it's done by a tool or a trowel.

Below are some common types of mortar joint used to build masonry wall -
  • Concave joint
  • V Joint
  • Struck joint
  • Weather joint
  • Raked joint
  • Flush joint
Concave joint: It is also called bucket handle joint. This joint is formed by a half-circular shaped jointing tool. This joint is globally accepted as the best joint for its resistance capability to water penetration.

mortar joint, masonry joint

V joint: Due to its "V" shape it's called "V" joint (see the pic). If the joint isn't properly compressed it can be the entry point of water.

mortar joint, masonry joint

Struck joint: In this joint, the top edge of the joint is finished flash with brick edge and the bottom edge is recessed.

masonry joint, mortar joint
 
Water resistance capability of this joint is very poor. Because the slope of the joint pulls water and allow to sit on a brick, which gives it more time to penetrate. So it is better to apply this joint on internal walls.

Weathered joint: This joint is similar as struck joint but the top edge is recessed instead of bottom edge of the joint. The water resistance capability of this joint is good due to its slope. But if the mortar isn't properly adhered with the brick water can penetrate running across the underside of the brick.

masonry joint, mortar joint

Raked joint: In this joint mortar is slightly recessed from the edges of the brick. It's why this joint is also called recessed joint. The surface of the joint is normally left roughened. But it is better to compact the surface to increase the water resistance capability.

It's not used in modern building due to its poor water resistance capability. But sometimes used to give a modern building a historic look.

masonry joint, mortar joint

Flush joint: The surface of the flash joint is left flush with brick edges. The resistance capability of water penetration of this joint is low. Because it is formed without compacting the surface.

Flush joint, type of mortar joint

Beside these, there are some other joints used to form masonry wall. These aren't normally used in building construction. For your knowing purpose these are given below -
  • Squeezed joint
  • Beaded joint
  • Grapevine joint

masonry joint, mortar joint

Whichever mortar joints you use to make masonry wall always remember one thing that exterior wall must be formed with tooled mortar joint. Such as "Concave" and "V" joint.
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Components of "Sub-Structure" of a building, BCT-4

Liton Biswas | 8/14/2014 | | Be the first to comment!
We have considered "Sub-structure" as 3rd work phase of building construction in our tutorial series. We left a "work-phase" that is "ground work". Because we discussed about that topic several times here in this blog. You can read them in following links -


In this post we'll discuss about sub-structure of a building.

First of all, we should know "what is sub-structure"?

"The structure below ground level can be defined as sub-structure".

Someone defined sub-structure as "the structure which can't be visible".

"The structure up to plinth level is defined as sub-structure" in many engineering books by specialists. 

From the definition of Sub-structure we can say it consists of the following parts of the building -

  • Foundation
  • Short/Neck column
  • Grade beam/Tie beam

Foundation: foundation also called base. A building completely stands on it. So it is the most important part of a building. There are many types of foundation we can make to build a building. Please see this post to know more about foundation.

Short/Neck column: Theoretically, short columns are those which effective length to least lateral dimension ratio don't exceed 12. Generally,  A column between foundation and grade beam is called short column or neck column.

Grade beam/Tie beam: grade beam doesn't carry any vertical load. It just ties columns to prevent lateral movement. That's why this beam is also called Tie beam. Sometimes ground slab rest on grade beam and thus carries vertical loads. Then it is called ground beam.

Dear reader, when I started this building construction tutorial series that time I expected to publish two or three posts in a week. But I was extremely busy on some of my projects. That's why I haven't published post for a long time. I'm sorry for that. From now I'll publish regularly, at least one post of this tutorial series in a week with some other important posts.

However, we already know from this post that ground floor slab can't be included in sub-structure as the ground floor slab is visible and ground floor slab is built above the plinth level, yet someone includes ground floor slab in sub-structure if it is build on the ground.

I've discussed briefly about sub-structure in this post. I'll discuss details about each item of sub-structure later in this tutorial series. Our next post of this tutorial series will be about super structure. So subscribe by email or RSS to get immediate update.
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Important Tasks of Construction Mobilization, BCT-3, PH-1

Liton Biswas | 10/31/2013 | | Be the first to comment!
Dear readers I'm extremely sorry for not publishing last posts in scheduled time. I was busy in some personal projects.

In previous post of this building construction tutorial series, we divided complete building construction works into 8 work-phases. In this post we are going to discuss the first phase of building construction that is mobilization.

Mobilization is the preliminary works of any construction project. In a board sense, construction mobilization refers to the processes and tasks that are undertaken before the actual groundwork begins. It needs the following important tasks to be performed -

  1. Temporary Fencing
  2. Labor shed making
  3. Power connection
  4. Water supply and Sanitation
  5. Site Office
  6. Storage
  7. Gathering tools and machineries
  8. Construction documents
  9. Other tasks, etc.

1. Temporary Fencing: The first task of starting construction project is to make fence all around the plot. It secures the plot. You can use signboard, banner, safety instruction, etc on this fence.

building construction tutorial, mobilization


2. Labor shed making: It is now common practice that labors who work on construction project stay in that project. So, it's essential to make a labor shed in the project. Choose a location carefully to make shed so that it doesn't hamper foundation work. Some big companies have permanent labor shed. So they don't need to make temporary labor shed on plot.

3. Power connection: For a construction project you must need continue power supply. So apply for power connection from electrical authority or arrange a generator to fulfill your need.

4. Water supply and Sanitation: As your workers will stay in project you will need pure drinking water and sanitation system for them. Pure drinking water also need for construction works. So, apply for water supply connection from national water supply authority or set a deep tubewell.

5. Site Office: Ofcourse, a project management team will work during the construction period of the project, there will be held meetings among clients, owners, contractors, sub-contractors and stackholders. For them you'll need a site office with proper sanitation and water supply facilities.

6. Storage: For storing building materials, construction equipments and tools you'll need a storage with lock and key.

7. Gathering tools and machineries: Gather necessary tools and equipments on project for construction works

8. Construction documents: Copies of all legal documents such as building permission, electricity, water and gas connection permissions from concerned authority, etc should be arranged and kept in project.

9. Other tasks: Keeping safe the passerby as well as the workers and stuffs from accident providing safety signboard is also included in mobilization. Arranging first-aid box and fire fighting equipments should be included in mobilization.

Sometimes cleaning and levelling the ground are included in mobilization phase of construction. I included those in ground-work phase.

This is the summary post of tasks of the mobilization phase. Some of these tasks need further explanation. I'll describe those in future posts.


Your Turn
Do you want to add any other task/tasks in mobilization phase of construction? Please share in comment...
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8 Work-Phase of a Building Construction Project, BCT-2

Liton Biswas | 10/14/2013 | | Be the first to comment!
In the previous post of this "building construction tutorial series" I briefly discussed about soil investigation, structural designing and planning of a building. After successfully completing that process, a contractor is selected by bidding process for constructing the building and a complete set of drawing is handed over to the contractor.

Here some things should be explained so that you can understand the process clearly.

Some construction company buy land and employ consultant to design and make plan for the building. This type of company doesn't need to go through the bidding process for selecting contractor (direct contractor). They generally employ sub-contractors for various work phase. They normally manage the project by their own project management team.

But when you are making your own building you have to employ contractor to complete the project because you don't have construction instrument and project management team. You just finance the project, the rest will be done by contractor.

The above explanation doesn't need to include in this tutorial. Because, I started this tutorial for construction professionals. I described this so that beginners can understand the whole process well.

Now our actual tutorial is started from here.

After taking building permission for starting construction from government authority you can proceed.

building construction tutorial

8 Work-Phase of a Building Construction

Whatever you call these phases, construction-phase or work-phase, a typical building construction involves following sequence of work-phase -

  1. Mobilization
  2. Ground work
  3. Sub-Structure work
  4. Super Structure work
  5. Masonry work
  6. Services work
  7. Finishing work, and
  8. Completion.

1. Mobilization: Mobilization is the process of making ready the plot for starting construction. It includes making fence all around the plot, making labour shed, ensuring services facilities, transferring construction tools and equipments to the plot, etc. Read more about "Mobilization" here.

Read more: 7 Preliminary Works to Do Before Starting a Construction Project

2. Ground work: Ground work includes cleaning the plot, levelling ground, bench-marking etc.

See: 6 Ground Work to Prepare a Land for Building Construction

3. Sub-Structure: Parts of structure which are contacted with earth is called sub-structure. Such as -

  • Foundation
  • Short/Neck column
  • Grade/Tie beam
  • Ground floor, etc.

4. Super Structure: The parts of structure above ground is the super structure. Such as -

  • Column
  • Slab and Beam
  • Staircase
  • Parapet, etc.

5. Masonry work: Masonry work includes -
  • Masonry wall work
  • Plaster work, and
  • Tile work, etc.

6. Services work: Services works are -

  • Electrical work
  • Sanitary and Plumbing work
  • Air-Conditional work, etc.

7. Finishing work: Typical finishing works in a building are -

  • Painting work,
  • Wooden work,
  • Aluminium work,
  • Metal work, etc.

8. Completion: This is the last stage of construction of a project. This includes -

  • Final touch
  • Cleaning
  • Final inspection, and
  • Handover.

The above discussed "8 work-phase" are the typical stages for completely constructing a building. I designed this "building construction tutorial series" based on those "8 work-phase".

As every work-phase contains several other work-items, I'll discuss every work-item separately in this tutorial series. So, please subscribe to ACE via EMAIL or RSS to get update when it happens.

Read previous post of this "building construction tutorial series" here.


Your Turn
How would you like to divide building construction works into phases? Please share in comments...

 
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Soil Investigation Basics for Engineering Purpose

Liton Biswas | 10/09/2013 | | | Be the first to comment!
Soil investigation is done for various purpose. In this post I'll describe the soil investigation basic for engineering purpose.

We all know, it is essential to investigate the soil of the selected plot on which a structure will be constructed.

Based on soil investigation a soil report is prepared for the purpose of designing the building foundation. When an engineer designs building foundation he/she must carefully read the report and designs the foundation based on the data provided in the report.

Soil investigation basic
 

Why soil investigation is required for designing foundation?

Soil investigation is required for the following purposes -

  • To know the allowable bearing capacity of foundation for proposed building.

  • To know the depth and type of foundation for the proposed building.

  • To know the allowable passive resistance for the foundation of proposed building.

  • To know the type, grading and nature of soil.

  • To know the ground water level.

Methods of soil investigation

The common methods of soil investigation are -
  • Inspection
  • Test pits
  • Probing, and
  • Boring.

Inspection: In some places you don't have to investigate much. You'll get enough data to design the foundation of the proposed building by just inspecting the plot. This method of soil investigation includes know the geological condition of the plot, getting data about neighbour buildings, their foundation type and depth, etc.

Test pits: This is done to collect soil samples for detail analysis. In this method several pits are dug by hand or excavator. The depth of pit is below 5 feet so that one can have visual inspection. Several samples are collected from the pit of both disturbed and undisturbed soil.

Probing: In this method a 25 mm or 40 mm diameter steel bar is driven into the ground till solid soil strata is found. It is normally driven by hammer. The penetration and withdrawl of the steel rod is closely observed to know the nature of soil layer.

Boring: In this method several bore holes are made for the purpose of collecting soil sample from below the ground. Then the collected sample is analysed for preparing the soil report.

Typical steps of soil investigation

Soil investigation involves following steps -
  • Details planning for the sequence of operations.

  • Collecting the samples of soil from the plot.

  • Determining the soil characteristics by conducting field tests.

  • Study the condition of ground water level.

  • Collecting ground water sample for chemical analysis.

  • Soil exploration.

  • Testing all collected samples in the laboratory.

  • Analysis the test results.

  • Preparing report.

Based on this prepared report a structural engineer designs the foundation of structure for the proposed plot.
 
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