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

Calculate the amount of waste, Calculate the Amount of Waste A municipa...

Calculate the Amount of Waste A municipal solid waste department plans to separate a portion of the ferrous metal, newsprint and cardboard from its MSW waste stream. The depart

What is diamond crossing, Q. What is Diamond Crossing? Diamond Crossing...

Q. What is Diamond Crossing? Diamond Crossing is provided when two tracks cross each other either of the same gauge or of different gauges. It consists of two acute crossing (

What do by diaphragm wall, Q. What do by Diaphragm wall? For the constr...

Q. What do by Diaphragm wall? For the construction of diaphragm walls adjacent to buildings, former experience showed that excess slurry head above groundwater level had to be

Waterway, What is linear waterway?

What is linear waterway?

Cost effective buildings, How to construct Semi Ellitical Buildings of 15fe...

How to construct Semi Ellitical Buildings of 15feet dia., in Brick Masonry.

Surveying, difference between observed magnetic bearing and true magnetic b...

difference between observed magnetic bearing and true magnetic bearing

Explain the kinematic viscosity, Explain the Kinematic Viscosity Ratio ...

Explain the Kinematic Viscosity Ratio of a fluid's Viscosity to the same fluid's Density.  Greek symbol: ν nu    ν = μ/ρ = Absolute Viscosity/Mass Density    Units: ft

Joints in concrete carriageway, Question Is it necessary joints of conc...

Question Is it necessary joints of concrete kerbs be in line with joints in concrete carriageway ? Answer In regular practice, joints are provided in road kerbs to ca

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