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

Tension members, Tension Members: You have learnt about the Standard s...

Tension Members: You have learnt about the Standard specification for structural steel and various types of structural steel rolled sections. Different types of loads, stresse

Tension member, Explain various forms of tension members.

Explain various forms of tension members.

#title.METALS., WHAT IS THE DIFFERENCE BETWEEN FERROUS AND NON FERROUS META...

WHAT IS THE DIFFERENCE BETWEEN FERROUS AND NON FERROUS METALS

Construction of parabolic shapes, construct parabolic shapes using the enve...

construct parabolic shapes using the envelop method and the offset method with dimensions 80 by 120

Diferential equations, show that Y = 4e2x - 2e-3x is a solution of initia...

show that Y = 4e2x - 2e-3x is a solution of initial-value problem (d2y)/(dx2)+ (dy)/(dx) - 6y=0 ; y(0)=6 ; y’(0)=2 . is Y = 2e2x - 4e-3x also a solution of this proble

Surveying, What is the shrinkage factor

What is the shrinkage factor

Define ways of providing the anti slip device - by stops, Define Ways of pr...

Define Ways of providing the anti slip device - By stops? In this method stopper plates or angles are welded to the underside of the girder and embedded in the bed block. It sh

#title., desirable properties in green concrete

desirable properties in green concrete

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