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

Permanent repairs to rail fracture, Q. Permanent Repairs to rail fracture? ...

Q. Permanent Repairs to rail fracture? (i) If the fracture is such that, wide gap A T welding ban be adopted, then the total length of fractured ends to-be cut shall be equal t

Design of steel structure, design acolumn spice for column sections SC 250 ...

design acolumn spice for column sections SC 250 and SC 220 carrying a load of 500 KN

What is the correct value of the specific gravity, In a specific gravity te...

In a specific gravity test, 1.17 N of oven-dired soil was taken. The weight of pyknometer, soil and water was obtained as 6.51 N. The weight of pyknometer full of water alone was 5

Describe principles of river protection works, Q. Describe Principles of ri...

Q. Describe Principles of river protection works? Determination of design discharge for a bridge is sometimes required to be based on flood marks left during unprecedented abno

Explain measured shovel packing, Explain Measured shovel Packing Measu...

Explain Measured shovel Packing Measured shovel Packing essentially consists of accurate measurements of track defects particularly the unevenness and voids caused in the cour

Show the silt curtain touching seabed, Q. Show the Silt curtain touching se...

Q. Show the Silt curtain touching seabed? Silt curtains are impermeable vertical barriers extending from seawater surface to their designed depths. Curtains are held in a verti

What is oil interceptors, Q. What is Oil interceptors ? Oils and Grease...

Q. What is Oil interceptors ? Oils and Grease are usually found in stormwater runoff from catchments. They come from spillage and leakage of fuels, lubricants, Vehicle coolants

Grade of cement, Grade of Cement: In India, the following grades of c...

Grade of Cement: In India, the following grades of cement are used for roads : Ordinary Portland Cement (OPC) Grade 33 Grade 43 Grade 53 Portland Pozz

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