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

Timber grading, IS 883-1970 classifies the structural timber into 3 grades-...

IS 883-1970 classifies the structural timber into 3 grades-select grade, grade I and grade II

Packing resources in joint of concrete pipes in pipe jacking, Question ...

Question What is key function of packing resources in joint of concrete pipes in pipe jacking ? Answer Packing resources are about 10 to 20mm broad and are usually mad

Elaborate the term - prestressed concrete pipes, Elaborate the term - Prest...

Elaborate the term - Prestressed concrete pipes Liquid retaining structures, such as circular pipes, tanks and pressure vessels are suited for circular prestressing. The circum

Tests on stones, Tests on Stones To ascertain the needed properties of ...

Tests on Stones To ascertain the needed properties of stones, described tests can be conducted: A.   Crushing strength test B.   Water absorption test C.   Abrasion te

Premix road, plz tell me the ratio of sand,aggregate,and asphalt.pl tell me...

plz tell me the ratio of sand,aggregate,and asphalt.pl tell me the mm of aggregate

Frames, how to analyse a frame

how to analyse a frame

Surveying, why we perform survey work from whole to the part?

why we perform survey work from whole to the part?

Radial flow pumps for small flows and high heads, Radial flow pumps for sma...

Radial flow pumps for small flows and high heads In radial flow pumps, a diffuser/volute is generally designed at it outlet to convert the kinetic energy obtained during the pu

Cross-sectional elements - geometric design of roads, Cross-sectional Eleme...

Cross-sectional Elements: The terms used in the cross-section of a road are : Carriageway The portion where traffic moves. Shoulder The portion outside the 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