Some useful tips to develop and pour concrete stairs

The renowned concrete contractor, David Odell, has presented an exclusive construction video tutorial that provides some useful construction tips on how to develop and pour concrete stairs (10 steps of stairs).

These are the basic steps for developing concrete stairways. This video will guide you to build up your own concrete stairs. Steps shown in this video comprise of laying out the size, arranging the sub-base, developing the forms, pouring, finishing and curing the concrete from starting to completion.

A “riser” refers to the vertical surface of the step and a “tread” refers to the horizontal surface of the step. To define the whole size of the concrete stairs, initially, you should work out the total rise and run of the steps you are going to form.

To learn the complete process, watch the following video tutorial.

Some useful tips to develop and pour concrete stairs

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Published By
Arka Roy
http://www.constructioncost.co
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Characteristics of Mass Concrete

Mass concrete is made with solid structures (> 80 cm). These structures frequently contain a greater volume. It signifies that large volumes of concrete should be set up in a short time. It needs highly well-organized planning and competent methods.

Mass concrete is applied for:

 Foundations for large loads
 Foundations for buoyancy control
 Solid walls (e.g. radiation protection)
 Infill concrete

The following major issues are formed with these enormous structures:

 Extreme internal and external temperature discrepancies throughout setting and hardening
 Excessive maximum temperatures
 High internal and external temperature deviations and as a result forced shrinkage
 Secondary consolidation (settling) of the concrete and as a result cracking occurs over the top reinforcement layers and also settlement under the reinforcement bars

Riska: All of these issues can lead to cracks and cement matrix defects assumed to be “skin or surface cracks” which may happen if the external/internal temperature variation is more than 15 °C or the outer layers can contract because of their initial drying out. Usually, the depth of skin cracks is few centimeters and can close again later.

Proper Measurement:

 Utilize cements with low heat development
 Low water content (curtailment in w/c ratio)
 Biggest possible maximum particle size (e.g. 0–50 rather than 0–32)
 If required, chill the aggregates to have a low initial fresh concrete temperature
 Set the concrete in layers (layer thickness < 80 cm)
 Restrain the bottom layers to make sure that the entire section is recompacted as soon as the top layer is set
 Start curing by applying thermal insulation methods
 Make sure the proper design and circulation of joints and concreting sections, so that heat can be dissipated and the temperature developments and deviations can be adjusted

Characteristics of Mass Concrete

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Published By
Arka Roy
http://www.constructioncost.co
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Brief demonstration of drywall estimating template in excel

This construction video tutorial provides the demonstration of user-friendly and spreadsheet based drywall estimating software.

It becomes difficult for the contractors to estimate and finish takeoff from drywall works. But this video shows how to make the process simple. In a drywall estimating process, the following steps should be included :-

Workout the Square Footage

Estimate Drywall Boards

Estimate Drywall Tape

Estimate Joint Compound

Estimate Drywall Screws

Estimate Corner Beads

Estimate Drywall Miscellaneous

Estimate Other Components

To learn the complete process, watch the following video tutorial.

Brief demonstration of drywall estimating template in excel

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Published By
Arka Roy
http://www.constructioncost.co
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How to make design of concrete corbel with spreadsheet

If you want to be familiar with the detailed process necessary for creating the design of a RCC Corbel in excel based spreadsheet following ACI 95, then you should go through the following construction video tutorial.

In architectural term a corbel stands for a structural piece (a type of bracket) made of stone, wood or metal that is overhanged from a wall to bear an oppressive weight. In brief, a corbel refers to a solid piece of material in the wall.

Corbels are mostly utilized in precast concrete construction to provide support to main beams and girders.

ACI 318-95/318R-95 is defined as building code requirements for Structural Concrete & Commentary.

ACI 318-95 offers good information to the engineers and designer. The most significant modification included in the new code is that references to “reinforced concrete” are turned into “structural concrete.”

To learn the complete process, watch the following video tutorial.

How to make design of concrete corbel with spreadsheet

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Published By
Arka Roy
http://www.constructioncost.co
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How to design a beam in excel with coefficient method

This construction video tutorial sifts through the process for evaluating engineering drawing easily.

This construction video tutorial provides detailed guidelines on how to use excel based spreadsheet to design a beam. Here coefficient method is applied for designing purpose.

The calculation is made on the basis of the following drawings :-

  1. Typical floor plan
    b. Ground floor plan
    c. Column Layout
    d. Beam Column Layout

The coefficient method refers to a rapid hand-system that can be used for computing the moments in two-way slabs supported with edge beams. This method was initially contained in the 1963 edition of the ACI code as a method for creating design of two-way slabs which are supported on all four sides through walls, steel beams, or deep beams. The most recent version of the ACI code 318 does not contain the coefficient method but you can apply it for two slab systems with edge beams.

This method employs tables of moment coefficients for different types of slab edge conditions. The coefficients are dependent on elastic analysis but also comprises of considerations for inelastic moment redistribution.

To learn the complete process, watch the following video tutorial

How to design a beam in excel with coefficient method

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Published By
Arka Roy
http://www.constructioncost.co
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KaderColumn – A useful construction program for column analysis

KaderColumn is a powerful construction program that is created for reinforced concrete tied short columns.

It can be used to create the designs of columns based on up to eleven cases of loading comprising of axial load and bending moment implemented about the maximum principle axis.

The program allows to build up the column strength interaction diagram (Bending moment-Axial load curve) out of the input data of the cross-section and verify whether all input cases of loading are situated inside the design curve. If the input data of the cross-section is insufficient, the program enhances them to commence from the Min. Roh to the cross-sectional dimensions unless all input cases of loading remain inside the design curve. The program provides proposition for setting ties properly and draws them.

Features:

  • It is very user-friendly and short.
    • It computes and draws the column strength interaction diagram toward a reinforced concrete tied short column having a rectangular (containing rebars at two sides only or at all four sides), square or circular section and depending on axial load and bending moment around the max. principle axis of its cross-section.

 

  • Up to eleven cases of loads (axial load and bending moment) are permissible. The program examines all these cases which should remain inside the column interaction diagram.
    • It designs the section and draws by organizing ties in an efficient manner.
    • The user will be capable of rectifying the section dimensions, the min. and max. ratio of reinforcement and some other parameters for obtaining the rational section from his point of view.
  • The user will be able to save and open the input data file that is already saved by the program.
    • The program employs the ultimate strength method for design and abides by the exact ACI 318-02 Code requirements.

To download this construction program, visit the developer’s website www.cadkad.com

KaderColumn – A useful construction program for column analysis

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Published By
Arka Roy
http://www.constructioncost.co
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Some useful tips to read civil engineering drawings efficiently

This construction video tutorial sifts through the process for evaluating engineering drawing easily.

In this video, some crucial topics like grid lines in civil engineering, problems found in the drawing, are explained briefly.

A civil drawing contains a series of various types of site drawings. It is a type of technical drawing that provides information on utility, grading and drainage, site improvements, and landscaping plans as well as other site details. The objective of these drawings is to provide a clear conception of all things in a construction site to a civil engineer. In these drawings the site layout plan and floor plans are set up.

Civil drafters arrange the drawings, topographical and relief maps which are applied in leading construction or civil engineering projects like highways, bridges, pipelines, flood control projects, and water and sewage systems.

In the drawing, there are Grid Lines specified with dimensions n. The grid lines facilitate references to be created on the basis of the position/location of different constituents in the project. The Main Contractor will then employ a license surveyor to organize the grid lines on site.

In the video, a sample drawing is considered. There are 8 columns in this drawing with the dimension 29.5” x 19.5”. Here the header lines will demonstrate the center line of the column.

To learn the complete process, watch the following video tutorial

Some useful tips to read civil engineering drawings efficiently

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Published By
Arka Roy
http://www.constructioncost.co
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A position is vacant for principal roads/highways engineer

The Company: A leading engineering Services business a strong presence and excellent track record of rendering major transport corridors in dominant international cities, is inviting applications for the position of principal roads/rail engineer to direct and assist the business in rendering large and modern infrastructure work.

Job role: As a Senior / Principal designer, you have to work in tandem with the Infrastructure & Transport team as well as take responsibility for supervising engineering design, project delivery, detailed design and technical troubleshooting on a wide array of big Transport infrastructure assignments (road, tunnelling & rail).

Duties and responsibilities:

  • Civil design of large scale and modern road, highways, rail and transport Infrastructure projects around Melbourne and Australia.
    • “Senior Management” opportunity.
    • Use of 12d / Inroads / BIM all for creating outstanding civil design for Highways, rail and drainage projects.
    • Participate in design review meetings with primary stakeholders and make sure that project milestones are fulfilled as per quality, budgetary and safety standards.
    • Contributing in a work friendly environment.
    • Communicating with Stakeholders perfectly in a joint venture / alliance environment.

This position is ideal for senior Civil Engineer / Designer having more than 10 years of working experience in the infrastructure / consulting industry.

If you think that you are eligible for the post, send your curriculum vita to Alan Pratt at alan@designandbuild.com.au and give a call on 0421 116 107 to get more details about the job.

A position is vacant for principal roads/highways engineer

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Published By
Arka Roy
http://www.constructioncost.co
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How to determine grades of concrete following IS 456:2000 standard

This construction video tutorial explains the grades of concrete with adherence to IS 456:2000 as well as process for detecting the characteristics strength of concrete.

IS 456-2000 refers to an Indian standard code of practice for general structural use of plain and reinforced concrete.

Grade of concrete determines the compressive strength of concrete. To calculate grade of concrete, standard compression test is carried out on concrete cube of 150 mm. Grade of concrete is demonstrated with M10, M20, M30 etc. where M stands for Mix i.e. mix of constituents used for concrete. Numeric figure in M stands for characteristics compressive strength (fck) that is stated MPa (N/mm2).

Characteristics compressive strength means the strength of material under which not over 5% result is presumed to fall.

As for example if 20 samples of concrete cubes are casted and carried out compression tests for them in the laboratory to determine their compressive strength. Results for test are 27.3, 25.4, 26.9, 25.1, 23.8, 27.6……20 results. If these are organized in increasing order, here 23.8 is less than 25 and remaining are greater than 25 in MPa. So, it signifies that one result falls under 25 MPa and it is detected that only 5% of results fall under 25. Therefore, grade of concrete remains M25.

As per IS code, there are three comprehensive categories for concrete as follow :-

Type of concrete Grade
High Strength Concrete Over M 60
Standard Strength Concrete M25 to M55
Normal Strength Concrete M10 to M20

 For online demonstration, watch the following video.

How to determine grades of concrete following IS 456:2000 standard

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Published By
Arka Roy
http://www.constructioncost.co
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Guidelines for reinforced cement concrete design

This construction video provides detailed guidelines for designing reinforced cement concrete with adherence to the Indian National Building Code (IS 456 – 2000).

This code is designed for general structural application of plain and reinforced concrete. This code employs the limit state design approach along with working stress design approach. It provides wide-ranging information on the different characteristics of concrete.

It comprises of the following five sections and eight annexures:

• Section 1: General
• Section 2: Materials, Workmanship, Inspection and Testing
• Section 3: General Design Considerations
Section 4: Special Design Requirements for Structural Members and Systems
• Section 5: Structural Design (Limit State Method)

By going through this video, you will learn how to design various types of structural components like beam, column, slab, footing etc. as well as objective of structural designing.

The video briefly explains the following topics :-

1. Purpose of structural designing and designing method
2. Variation among plain concrete and reinforced concrete
3. Fundamental characteristics of concrete as follow
a. Grade of concrete
b. Characteristics strength of concrete
c. Modulus of elasticity of concrete

d. Creep and shrinkage
e. Longevity
f. Tensile strength
4. Fundamental properties and categories of reinforced steel
a. Grade and categories of steel
b. Yield strength of mild steel and HYSD Bars

Watch the following video for online demonstration.

Guidelines for reinforced cement concrete design

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Published By
Arka Roy
http://www.constructioncost.co
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