I am looking forward valuable suggestions on the question listed below.
Does cracking in mass concrete structure depend upon temperature drop rate of concrete per day at initial curing period at construction phase of concrete dams?
Shrinkage rate is highest in the initial 7days , you may refer any concrete technology book like one by Neville for details.
Kim et al. explained effects of curing on different temperatures in their paper "Effect of temperature and aging on the mechanical properties of concrete: Part I. Experimental results". They found out that concretes subjected to high temperatures at early ages attain higher early-age compressive and splitting tensile strengths but lower later-age compressive and splitting tensile strengths than concretes subjected to normal temperature. This behaviour will certainly somehow effect the cracking pattern in concrete.
Please refer to the mentioned paper.
Dear Bhosle and Dear Kumar, Thank You so much. I really appreciate your suggestions.
The main problem associated potential cracking of mass concrete at early ages is a two-fold problem. on one side, the heat of hydration of concrete varies significantly with time depending on the type and quantity of cement. On the other hand, the ambient temperature varies and the heat loss at the boundaries with environment lower temperature of the surface part of the mass. For a dam problem, the thickness may induce an adiabatic or semi-adiabatic condition at the core of the structure. Thus the difference (the drop) in temperature between the outer and inner parts induces tensile stresses at early ages at which the development of tensile strength is relatively low.
A full simulation of the problem including the simulation of hydration, the actual development of tensile strength, and the simulation of the outside temperature variation should be taken into consideration together with te type of curing to assess the potential of cracking.
it ia a rather complicated problem
Agree with Rajkamal Kumar ......Good question.. Please share me the best answer might you trust...
Regards…
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