Time to remove formwork to cater for early thermal movement, Civil Engineering

Assignment Help:

Q. Time to remove formwork to cater for early thermal movement?

Let's take a circular column as an illustration to explain effect of internal restraint to thick sections. 

When temperature is increasing, temperature in the core is higher than outer zone. The inner core would have a higher expansion and exert pressure to the outside. Induced compressive stress will yield the formation of radial cracks near the surface of concrete.

When temperature drops, concrete at outside drops to surrounding temperature whereas the concrete at central region continues to cool down. Contraction associated with inner concrete persuades tensile strains and forms cracks tangential to circular radius. 

It is advantageous for thick sections (say >500mm) to have late removal of formwork to decrease early thermal cracking. This is to enable more time for the centre of concrete section to cool down progressively to decrease the risk of thermal cracking. It is effective in controlling thetemperature differential across the cross section of concrete structures and decreasing the potential of internal cracking because of early thermal movement.


Related Discussions:- Time to remove formwork to cater for early thermal movement

Define the pressure on a vertical plane, Define the Pressure on a vertical ...

Define the Pressure on a vertical plane Fluid pressure increases linearly with increasing depth. The average pressure on a vertical plane occurs at the average vertical depth.

Settlement due to increasing load on surrounding soil, Q. Settlement due to...

Q. Settlement due to Increasing Load on Surrounding Soil? When any portion of the ground surface  has been loaded, it causes  the surface  of adjacent soil also to tilt and set

Determine the soil shrinkage, Soil at a borrow area has a total unit weight...

Soil at a borrow area has a total unit weight of 120-PCF and a water content of 15 percent.  The soil from the borrow area will be used as structural fill and compacted to an avera

What to do to improve the reliability of the test results, Explain clearly ...

Explain clearly with a neat sketch how you will verify the coefficient of permeability of a clay sample in the laboratory and derive the expression used to compute the permeability

Define water jets for underwater inspection of bridge, Define Water jets fo...

Define Water jets for underwater inspection of bridge? These tools are widely used and produce a bright metal finish in one operation. Grit entrainment is available and makes t

Construction management, pert disadvantages of software support, datacolle...

pert disadvantages of software support, datacollection , interpretation of results issues

Soil particles for geotechnical design, Question Will it worthwhile to ...

Question Will it worthwhile to take out tests on particle density of soil particles for geotechnical design? Answer Particle density of soils is definite by ratio of

Designing of retaining walls, Question What is function of shear keys in d...

Question What is function of shear keys in designing of retaining walls ? Answer In formative external constancy of retaining walls, failure modes similar to bearing failure, s

The right triangle, a lighthouse standing on the cliff observed from two op...

a lighthouse standing on the cliff observed from two open boats A and B in a vertical plane thourgh the lighthouse.the angle of elevation of the top of the lighthouse viewed from B

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd