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Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
Thermal cracking may result from rapid. drops in the temperature of the concrete, such as when. concrete stabs or walls are placed on a hot day fol-. lowed by a cool night. High temperature also acceler-. ates cement hydration and contributes to the potential. for thermal cracking in massive concrete structures.