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

Minor losses using th method of loss coefficients, Minor Losses Using Th Me...

Minor Losses Using Th Method of Loss Coefficients One method of calculating the energy loss as a result of fluid flowing through a device or fitting, each device or fitting has

Discuss about the fibre reinforced concrete, Discuss about the fibre reinfo...

Discuss about the fibre reinforced concrete Tensile strength of concrete may be improved by using a higher grade of concrete or by using special concretes such as fibre reinfor

Survey chain, describe gunters chain in survey

describe gunters chain in survey

Chemical analysis of fe 415., in this chemical analysis what is the meaning...

in this chemical analysis what is the meaning of c% and s% and P%

Describe types of spurs, Q. Describe types of Spurs? Spurs can be of va...

Q. Describe types of Spurs? Spurs can be of varied types. They may be either permeable or impermeable. Permeable spurs are open structures constructed by driving wooden balties

Dissimilarities between pipe culverts and box culverts?, Question What are ...

Question What are main dissimilarities in applications between pipe culverts and box culverts ? Answer Essentially, culvert resources covered hydraulic structure that conveys fl

What is objective method of assessment, Q. What is objective method of asse...

Q. What is objective method of assessment? Track recording consists of objective method of assessment of the quality of track with the help of sophisticated equipments. A conti

Graphics, 1. Draw the projections of a line AB that is 50 mm long and is pa...

1. Draw the projections of a line AB that is 50 mm long and is parallel to both the HP and the VP. The line is 40 mm above the HP and 25 mm in front of the VP. 2. A line AB, 50 mm

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