AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

Heat of hydration raises the core temperature while the surface cools and is restrained; controls include lower cement content, supplementary cementitious materials, cooled materials, smaller lifts, and insulation to limit the temperature difference The concrete is too cold to hydrate; the control is to add calcium chloride to every mass placement Mass concrete never cracks, so no controls are needed Cracking is caused only by the vibrator, so vibration should be omitted