amr soliman - Answers
Home/ amr soliman/AnswersDo you need to remove the ads? Join now!
Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When you join you get additional benefits.
Log in to TheConstructor to ask questions, answer people’s questions, write articles & connect with other people. When you join you get additional benefits.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
What is the difference between Granular Sub Base (GSB) & Wet Mix Macadam (WMM) in Pavement structures?
amr soliman
SUB BASE (GSB)– it is being laid in road work because it plays two major roles 1- it works as a drainage layer 2- it provides a good sub-base to laid base layer on it. The material to be used for the work shall be natural sand, crushed gravel, crushed stone, crushed slag, or a combination thereof deRead more
SUB BASE (GSB)– it is being laid in road work because it plays two major roles
1- it works as a drainage layer
2- it provides a good sub-base to laid base layer on it.
The material to be used for the work shall be natural sand, crushed gravel, crushed stone, crushed slag, or a combination thereof depending upon the grading required use of material like brick metal, kankar and crushed concrete shall be permitted in the lower sub-base. The material shall be free from organic or other deleterious constituents.
Wet Mix Macadam consists of laying spreading and compacting of clean, crushed, well-graded granular materials on a prepared and approved Granular sub-Base. The material is well mixed with water and rolled to a dense mass. It shall be laid on one or more layers as per line and level, grade and cross-section shown in the drawing or as directed by the Engineer. The thickness of single compacted Wet Mixed Macadam (WMM) Base shall not be less than 75 mm. The maximum thickness of a single compacted layer base can be up to 250 mm upon approval of the Engineer.
See lessHow to Test Quality of Steel Reinforcement at Construction Site?
amr soliman
When a lot of steel received at site, First check the Manufacturer test certificate for its actual properties. With each lot of steel, manufacturer should send a test certificate of same lot for test done at their laboratory. Check for grade of steel mention in certificate and is as per the order orRead more
When a lot of steel received at site, First check the Manufacturer test certificate for its actual properties.
With each lot of steel, manufacturer should send a test certificate of same lot for test done at their laboratory.
Check for grade of steel mention in certificate and is as per the order or not.
Steel bars may have rusting on it, do check closely to know either it is acceptable or not.
Steel received should be free from any contamination like, mud, dust, oil and any other foreign material etc.
Bars should not have splits and any other deformation on it.
Check for brand of steel, diameter and grade of steel embossed on steel bars.
Cut the samples of 1 meter in length, min 4 nos of bars from different bundles.
Measure the length of cut bars by measuring it on at-least 4 sides and average out the length of bar.
Weight the bar on weight scale and record it in register.
Calculate the actual average weight per meter of bar for at-least 3 samples.
Compare the result of it with theoretical weight given in IS 1786
Check the variation in weight is within limit or not as per IS specification.
After finding the results for nominal mass as satisfactory proceed further to do bend test.
Bend test should be carried out as specified in IS 1599 and using mandrels of size specified in IS 1786
Bending Test:
Rebar sample should be bent at 180 degree as per procedure stated in IS 1599.
after this further process it to bend till 180 degree.
At site we can bend it on bar bending machine using appropriate size mandrel.
sample tested bar.
After bending the bar check the surface of bar opposite to bend side (which got tension, elongated due to bending) for cracks and rupture visible to a person with normal or corrected vision.
If there is no sign of rupture and cracks, rebar meets the requirement of bend test.
Further to this a rebend test also can be done at site, if required. (IS specifies for doing but if it passes bend test, in general it will pass the rebend test too. You cand do it at side provided you have required arrangement at site for this test)
For Rebending Test:
First bend the bar to including angle of 135 degree.
Keep it in boiling water at 100 degree for 30 minutes.
Then cool it down for some time.
After cooling bent it back to including angle of 157.5 degree
The rebar should not show any rupture or cracks to a person with normal or corrected vision.
Mandrel to use for Rebend test as specified in IS 1786
Below is pic showing bend rebend test (Closely look at the direction of bending and re-bending, in order to do correct test)
After getting satisfactory results, you can approve the steel for further usage in actual construction.
See lessMaterials Used in Sustainable Concrete?
amr soliman
Sustainable or green concrete is made of using raw materials such as fly ash, recycled concrete aggregates, and aluminum can fibers. Fly Ash- Widely used sustainable raw material for concrete is Fly Ash, which is a waste product from coal power plants and is commonly disposed of in ponds and sent toRead more
Sustainable or green concrete is made of using raw materials such as fly ash, recycled concrete aggregates, and aluminum can fibers.
Fly Ash- Widely used sustainable raw material for concrete is Fly Ash, which is a waste product from coal power plants and is commonly disposed of in ponds and sent to landfills. Fly ash has the potential to replace cement, a material with large environmental impacts due to air pollution from the cement plants.
Recycled Concrete Aggregates- To reduce the consumption of raw materials and to minimize the wastes generated from demolished concrete structures, crushed concrete can be reused as aggregates.
Aluminum cans- Aluminum cans, which are used for the aerated drinks, can be easily processed into chopped fibers and used as reinforcement in concrete.
See lessUsing of Robo Sand or M Sand instead of natural sand
amr soliman
it has a rougher texture than river sand it has no over sized materials or silt it provides higher concrete strength compared to river sand it's cheaper than river sand it's eco-friendly since m sand uses natural coarse aggregates to form
it has a rougher texture than river sand
it has no over sized materials or silt
it provides higher concrete strength compared to river sand
it’s cheaper than river sand
it’s eco-friendly since m sand uses natural coarse aggregates to form
See less