STRUCTURAL DEFECTS OF FOUNDATIONS AT CONSTRUCTION.
The Constructor
NOVEMBER 1, 2011
The problem areas, effects in foundation and defects in structure due to those causes are presented here. There can be many causes for these defects.
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The Constructor
NOVEMBER 1, 2011
The problem areas, effects in foundation and defects in structure due to those causes are presented here. There can be many causes for these defects.
The Constructor
AUGUST 16, 2012
Rubble Stone Soling: The rubble stone generally used are of best variety of black trap / granite / basalt or other variety of stone available locally.
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The Constructor
NOVEMBER 15, 2011
2) The axial lines (center lines) of the trenches are marked with the help of profiles, sighting rails, strings and pegs. (3) 3) The off-sets are measured from axial lines and the frontage lines are placed in their correct position relative to local requirements. (4)
The Constructor
NOVEMBER 8, 2011
Cracks in concrete beams due to increased shear stress 2. Cracks in concrete beams due to corrosion or insufficient concrete cover 3. Cracks parallel to main steel in case of corrosion in beams 4.
The Constructor
NOVEMBER 8, 2011
Cracks in reinforced concrete columns due to Steel Corrosion (cracks parallel to steel bars) 2. Cracks in reinforced concrete columns due to shrinkage of concrete 3.
The Constructor
AUGUST 7, 2012
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The Constructor
JANUARY 1, 2012
The benefits of using steel fibres in concrete are as follows: 1. Steel Fibres are generally distributed throughout a given cross section whereas reinforcing bars or wires are placed only where required 2.
The Constructor
NOVEMBER 15, 2011
Nominal Mixes In the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. These mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal mixes.
The Constructor
NOVEMBER 20, 2011
The concrete shall be deemed to comply with the strength requirements if: a) every sample has a test strength not less than the characteristic value;or b) The strength of one or more samples though less than the characteristic value, is in each case not less than the greater of : 1) The characteristic strength minus 1.35
The Constructor
AUGUST 7, 2012
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The Constructor
MARCH 21, 2012
The size of movement depends upon the change in temperature and the coefficient of thermal expansion o f concrete.
The Constructor
MARCH 25, 2012
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The Constructor
MARCH 21, 2012
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The Constructor
NOVEMBER 8, 2011
This type of shrinkage is caused by the loss of moisture from the cement paste constituent, which can shrink by as much as 1% per unit length.
The Constructor
MARCH 23, 2012
There are two ways of overcoming this problem: Embed another material in the concrete which is strong in tension – reinforced concrete Remove the tension altogether – by arching or prestressing.
The Constructor
NOVEMBER 25, 2011
WHY WE TEST CONCRETE SRTRENGTH AFTER 28 DAYS? Tweet Why do we test concrete compressive strength after 28 days? The table below shows the compressive strength gained by concrete after 1, 3, 7, 14 and 28 days with respect to the grade of concrete we use.
The Constructor
MARCH 25, 2012
Use of Precast Concrete in frames: There are two main types of precast building frame.
The Constructor
NOVEMBER 22, 2011
It has many advantages when compared to the normal conventional concrete. Fly ash is considered as one of the waste industrial product that cannot be easily disposed.
The Constructor
NOVEMBER 28, 2011
This method is used where large quantity of concrete work is involved at greater height, where other means of transporting is not easy to do.
The Constructor
MARCH 25, 2012
WHAT IS PRECAST CONCRETE? Tweet Precast concrete is cast under factory controlled conditions and not erected on site until it is fully hardened. Just like in-situ concrete, precast concrete can be plain, reinforced or prestressed concrete.
The Constructor
AUGUST 18, 2012
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The Constructor
NOVEMBER 17, 2011
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The Constructor
AUGUST 10, 2012
These are: Mild exposure Moderate exposure Severe exposure Very severe exposure, and Extreme exposure.
The Constructor
NOVEMBER 21, 2011
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The Constructor
DECEMBER 17, 2011
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The Constructor
MARCH 20, 2012
Cleanliness: when repairing concrete, care must be taken to remove any dirt or dust that will prevent the repair concrete bonding with the parent concrete. Expediency: The longer the repair is left, the more work has to be done, and the less likely that the repair will blend in.
The Constructor
AUGUST 24, 2012
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The Constructor
MARCH 22, 2012
Water within the hardened cement paste is forced to more as a result of the applied load.
The Constructor
MARCH 20, 2012
From the diagram above, we can see how the process unfolds.
The Constructor
JANUARY 22, 2012
The aggregate is more rigid than the cement paste and will therefore deform less (i.e. have a lower strain) under the same applied stress.
The Constructor
MARCH 25, 2012
The individual components are prefabricated off site then taken to site where they are erected.
The Constructor
SEPTEMBER 10, 2012
In this phase you assemble your team and assign tasks to individuals, develop a budget for the project, develop a schedule and create a communications plan. Planning the project: Planning phase of the project management is done based on organization done in the previous step.
The Constructor
NOVEMBER 28, 2011
Procedure for measuring bulk density of concrete is as per IS 1199 – methods of sampling and analysis of concrete.
The Constructor
NOVEMBER 21, 2011
The concrete can be specified in two ways : a) by proportioning of the constituents /ingredients (nominal mix) b) by required strength (Design mix) Concrete is mixed by any two methods, based on requirement as per quality and quantity of concrete required.
The Constructor
NOVEMBER 11, 2011
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The Constructor
JANUARY 14, 2012
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The Constructor
MARCH 26, 2012
The different materials are used according to their strengths and weaknesses to provide simple, buildable and competitive high-quality structures that offer consistent performance.
The Constructor
JANUARY 14, 2012
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The Constructor
NOVEMBER 16, 2011
Good foundation soil should be available at responsible depth. Nearness of schools, hospitals, market, etc. are considered good for residential site but these facilities do not carry any significance in the selection site for other public buildings. This aspect saves quite a bit in the cost of the building.
The Constructor
APRIL 2, 2012
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The Constructor
JANUARY 17, 2012
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The Constructor
MARCH 27, 2012
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The Constructor
NOVEMBER 27, 2011
This method is also used to find out 28 days compressive strength of concrete in 28 hours. (As As per IS 9013-1978-Method of making, curing and determining compressive strength of accelerated cured concrete test specimens).
The Constructor
JANUARY 17, 2012
The complete pier segment is then used as an erection platform and launching base for all subsequent travelling formwork and concrete segment construction. Special formwork is positioned and cast-in-situ pier segment is begun. Cast-in-situ segments range between 3mm to 5m in length with formwork moving in tandem with each segment.
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