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

Brigdes, infomation about differnt brigdes

infomation about differnt brigdes

Prestressed concrete structures, Distinguish between uniaxial biaxial and t...

Distinguish between uniaxial biaxial and triaxial prestressing

Designing of corbel beams in a pump station, Question In designing of ...

Question In designing of corbel beams in a pump station , why are shear links designed in top 2/3 of section? What is general advice on designing? Answer Corbel

Determine the size and number of aeration basins, Determine the Size and Nu...

Determine the Size and Number of Aeration Basins? For a community of 100,000, determine the size and number of aeration basins in a municipal activated sludge treatment facilit

Haley''s formula in pile driving, Question What is major difference bet...

Question What is major difference between "hammer efficiency" and "coefficient of restitution" at what time using Haley's formula in pile driving?   Answer Hammer ef

What is the dry density, Q. The field density of a compacted fill is deter...

Q. The field density of a compacted fill is determined by means of a core cutter whose empty weight is 1000 g and volume is 1000 cm 3 . The cutter full of soil weights 2890 g. If

Concrete surface finish - limitations of ultrasonic system, Define Concrete...

Define Concrete Surface Finish - Limitations of Ultrasonic System? The smoothness of the surface under test is important to ensure proper acoustical contact between the transdu

Alluvial streams, Alluvial Streams: In alluvial streams, the regime w...

Alluvial Streams: In alluvial streams, the regime width of a river is calculated from the Lacey's formula : W = 4.8 Q ½ where  W = Regime width in m, and Q = Discha

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