Effect of concrete placing temperature, Civil Engineering

Assignment Help:

Effect of concrete placing temperature on early thermal movement

Rate of hydration of cement paste is related to placing temperature of concrete. Rate of heat production is given by empirical Rastrup function:

H=H0×2r (T-T1)

Ho = Rate of heat production at a reference temperature

T = Temperature where rate of heat production H

T1 = Temperature where rate of heat production Ho

r = 0.084

A 12o C increase in placing temperature doubles the rate of reaction of hydration. Henceforth concrete placed at a higher temperature experiences a higher rise in temperature. For example concrete placed at 32oC generates heat of hydration twice as fast when compared with concrete placing at 20oC. Therefore high concrete placing temperature has significant effect to problem of early thermal movement.


Related Discussions:- Effect of concrete placing temperature

Explain is vadose zone - ground water, Explain is Vadose Zone - Ground wate...

Explain is Vadose Zone - Ground water In an unconfined aquifer, it is the area located above the water table and aquifer, where the soil and rock are not saturated with water.

Show the side clearance of pipes in trenches, Side clearance of pipes in tr...

Side clearance of pipes in trenches From the design point of view, it's predominant to minimize the width of pipe trenches due to thebelow reasons: (i)  Higher cost of exca

Chemistry, discuss various chemical reactions involved in lime soda process...

discuss various chemical reactions involved in lime soda process ?

Failure theory, condition for no tension numerical problem

condition for no tension numerical problem

Foundation, why is the foundation failure?

why is the foundation failure?

Vertical curves - geometric design of roads, Vertical Curves: When tw...

Vertical Curves: When two vertical gradients meet, it is necessary to provide a vertical curve. Two types of vertical curves are used: (a) Summit curve, where the point of

Illustrate truss with k-bracing, Q. Illustrate Truss with K-bracing ? I...

Q. Illustrate Truss with K-bracing ? In the arrangement of triangulated framework in truss structures, it's more economical to design longer members as ties whereas shorter one

Theory on the horizontal reactions of portal frames, Determine the horizont...

Determine the horizontal abutment reaction of a rectangular portal frame under increasing central concentrated load

Force system, show the diagram for non coplanar non concurrent force system...

show the diagram for non coplanar non concurrent force system

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