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Ciria Report C660 Earlyage Thermal Crack Control In Concrete

the new eurocode for early-age concrete crack control generally follows and builds on bs 8007 for liquid-retaining and containment structures and the fundamental theory for early-age thermal cracking in concrete. in conjunction with ciria report c660 summarising recent research and experimental data evenmore effective and economical design should be possible. unfortunately however there can be serious conflict in one major respect where large and unnecessary increases in reinforcement can be required for controlled cracking of edge-restrained members. thus efficient use of rebar and fibre reinforcement combinations to achieve well distributed fine cracks withminimumtotal reinforcement at the critical steel ratio could be seriously undermined for other types of concrete structures as well as water-retaining structures. the paper therefore examines themajor changes in the new code for early-age concrete crack control and compares these both with bs 8007 for convenience and with the fundamental theory for early-age cracking to resolve any conflicts or errors.

Ciria Report C660 Earlyage Thermal Crack Control In Concrete

since early-age thermal cracking happens after the hydration of the cement, the concrete temperature should be controlled as low as possible. there are several methods for the control of temperature rise during the construction of concrete. the control of temperature during the construction can be done by increasing the thickness of the concrete or using construction materials of lower temperature rise. using construction materials which have a lower temperature rise will not only decrease the amount of shrinkage strain induced in the concrete, but also increase the restraint to thermal strains. higher restraint factor will increase the restraint of the concrete to thermal strain and decrease the possibility of cracking. (trrl) (trrl)

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