Types of Beams in Construction and their definitions

Beam refers to a structural member and it is positioned laterally. When any load is delivered to it, Beam easily withstands the bending.

In a RCC beam there exist different types of components like wood, steel, aluminum, etc. Generally RCC (Reinforced Cement Concrete) is used as material in RCC beam. Based on the various factors, different sorts of RCC beam are available in the market. As for instance, Beam becomes rectangular, T-beam according to its shape. Beam is called double reinforced, single reinforced on the basis of reinforcement positioning.

Based on their supporting systems, RCC are available with 4 different types :-

• Simply supported beam or simple beam
• Semi-continuous beam
• Continuous beam, and
• Cantilever beam.

Given below their brief definition :-

Simple beam: It consists of a single length. It is sustained with two supports at either ends.

Semi-continuous beam: This beam doesn't contain more than two lengths. It is sustained with not more than three supports. In technical term, it is called as a continuous beam.

Continuous beam: This type of beam contains over two spans and it is sustained with more than three supports along its length. The supports are provided in one perpendicular line thus the spans are also in a perpendicular line.

Cantilever beam: It contains one support in one end and another end is exposed.

Another sort of beam exists in civil engineering field that is known as over-hanging beam. This beam expands behind its supports. In fact, this beam is created with the amalgamation of simply supported and cantilever beam.

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Published By

Rajib Dey

www.quantity-takeoff.com

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How to get rid of bleeding in concrete - Some useful tips

Bleeding is also termed as water gain in concrete. The water leakage in concrete is a serious issue and it happens because of low specific gravity of water. The leakage water is preserved at the top surface of concrete. Bleeding is generally happened in poor proportioned, inappropriately mix and extremely wet concrete. In low depth members like slab and road pavement, surplus bleeding arises throughout scorching weather concreting.

It also happens that along with water some quantity of cement also emerges out of concrete to the surface. The development of cement paste is recognized as laitance. Laitance makes feeble surface over consolidated concrete member below and shrinks bond concerning new and concrete. It is occurred while casting of column starters over the slab. Laitance should be taken out by chipping of the skinny paste prior to initiate next layer of concrete.

Water emerging from the top throughout bleeding, creates continuous channels within the concrete. Concrete turns to be leaky because of these continuous channels.

How to get rid of bleeding in concrete?

• Applying air entraining agents.
• Employing delicately segregated pozzolanic materials.
• By means of accurately proportion, and identical assimilation of concrete.

How to obtain the percentage of bleeding in concrete

Take the container having fairly accurate 10 lit capability and containing inner diameter of 250 mm and height about 280 mm. Load the container with brand new concrete in five layers (50 mm depth). Each layer must be tamped with tamping rod.

Work out the weight of concrete sample.

weight of concrete = (weight of container filled with concrete – weight of empty container.

Getting the total water content in 1 m3 of concrete (apply mix design data), quantity of water in container is estimated.

The container is positioned on level surface with any vibration and wrap it by lid (keep temperature approx 27 degree +/- 2 degree). Water amassed at the top throughout bleeding is drained by pipette at 10 mins intermission for the first 40 mins and 30 mins subsequently unless and until bleeding controlled.

Collect the water drained through pipette in jar and compute the volume.

% of bleeding = (volume of drawn water / volume of water in concrete sample) X 100

Ref. : www.constructionblog.org

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Published By

Rajib Dey

www.quantity-takeoff.com

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ICF Concrete Additives, LLC introduces HiperLon™ to substitute steel rebar in concrete application

ICF Concrete Additives, LLC launched the latest fiber, HiperLon™ which can make a sea change in the way concrete is set in all applications. HiperLon™ refers to a three-inch fiber that blends so well that it can even be shot-creted. HiperLon^TM can minimize as well as substitute steel rebar in precast, cast-in-place, underground, and shotcrete applications.
 Now the construction professionals can get rid of the issues like corrosion and failure in the concrete. Besides, the construction professionals can create their bid based on a fixed cost as there will be no cost fluctuation due to elimination of rebar for scheduling and estimating. HiperLon™ is supported with technical data to ensure that it will substitute rebar in precast and slab applications. It is now applied to complete rebar substitution in one- and two-story residences also.
Use of rebar is dangerous that can often lead to job threatening injuries. So the usage of HiperLon™ is increasing at a rapid due to safety issue.
 Several Texas based petrochemical companies on the Gulf Coast and municipalities now utilize HiperLon™ to reinstate their rebar in culverts and other flat work.
HiperLon™ treated concrete is verified under contract by multiple Military agencies; supplementary testing concerning impact and cracking under heavy loads, has exposed the finished concrete to include impressive properties. For getting more updates on HiperLon™ fiber, visit www.icfconcreteadditives.com.

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Published By

Tuhin Maity

www.quantity-takeoff.com

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