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

Influenza virus, humans who - are the most likely to contact swine flu

humans who - are the most likely to contact swine flu

Boundaries of rational method in calculating runoff, Question What are main...

Question What are main boundaries of Rational Method in calculating runoff? Answer Calculation of runoff is compound matter that depends on a lot of factors similar to ground

Define the meaning of grout - concrete, Define the meaning of Grout - Concr...

Define the meaning of Grout - Concrete Grout should be made with any type of recommended cement and using water of a required quality. If very large size ducts are to be groute

Torsion, what is torsional moment of resistance

what is torsional moment of resistance

Open channel, design of irrigation channel permissible velocity table

design of irrigation channel permissible velocity table

Strength of concrete at the transfer stage, Strength of Concrete at the Tra...

Strength of Concrete at the Transfer Stage Concrete strength in the member at the transfer stage should conform to the design requirements. The frequency of the sampling and t

Uncompacted bedding for concrete pipes, Uncompacted bedding for concrete pi...

Uncompacted bedding for concrete pipes In the middle third of the base of precast concrete pipes, bedding layers are suggested to be left Uncompacted since it helps to decreas

Handheld inspection tool for underwater inspection of bridge, Explain Handh...

Explain Handheld Inspection tools for Underwater Inspection of Bridge? Handheld tools such as flash lights, rulers, and tape measures for documenting areas; small or large hamm

Transition curves - geometric design of roads, Transition Curves: If ...

Transition Curves: If a vehicle travelling on a straight enters a horizontal curve abruptly, it will cause shock and sway. To avoid this, it is customary to provide a transit

Retaining walls, Retaining Walls: A wall used to retain some material ...

Retaining Walls: A wall used to retain some material on one or both sides of it can be termed as retaining wall. Commonly, it is used to retain soil at two different levels on

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