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Why is it that that concrete is stronger at bottom of column than on top?

when concrete is vibrated while pouring in to the form work, the cement slurry part tends to get drained through voids between aggregates and the richest part of cement slurry is detained at bottom portion of column. this causes a strong, dense, and void free concrete which ensures better compressive strength than the concrete on top portion of column.


How do you calculate the self-weight of a column?

To calculate the self-weight of a column, first determine the volume of the column by multiplying its cross-sectional area by its height. Then multiply the volume by the density of the material the column is made of (typically concrete or steel) to obtain the self-weight.


What is the difference between long and short concrete columns?

short column get failed due to crushing force only while long column got failed due to bending moment as well..


What is the advantage and disadvantage of reinforced concrete beam and column?

reinforced concrete prise


What grade of concrete use in column and slab?

as per ACI , the ratio between column & beam concrete grades dont exceed 1.4


What is column efficiency?

Column efficiency refers to the ability of a column in chromatography to separate compounds effectively. A more efficient column will result in better separation of components in a mixture and sharper peaks in the chromatogram. Efficiency is influenced by factors such as column length, particle size, and packing material.


What is a lally lock column?

A Lally Lock column is a concrete filled steel column that does not need to have the cap or base plates welded. The top end of the column is fitted with an embedded fastening unit that will accept a 1/2" screw to fasten the cap plate onto the column. The bottom end it just concrete and can be cut with a pipe cutter. Base plates are fastened with concrete screws.


What is Lally lock column?

A Lally Lock column is a concrete filled steel column that does not need to have the cap or base plates welded. The top end of the column is fitted with an embedded fastening unit that will accept a 1/2" screw to fasten the cap plate onto the column. The bottom end it just concrete and can be cut with a pipe cutter. Base plates are fastened with concrete screws.


How do you design a concrete column in a multi floor building?

A concrete column in a multifloor building must have ample steel reinforcement for the components that rest upon it. Welded 'haunches' are used to support the weight of girders and other pieces that rest on the column.


What is the column material in gel filtration?

the column is some strange scientist


How many hours can remove the form works of column structure after casting concrete?

24hours with concrete grade 35


Can you pour concrete into a column and it not crack?

Yes but concrete is going to crack if it has too much stress. If it's a decorative column then use a 4000 mix. If it has a load on it you will have to figure how much weight is going to be on it.