Abstract
The purpose of this study is to indicate a method of deciding the proportioning strength of precast concrete according to element type and strength level, such as a shape of element, a cross sectional dimension of element, type of cement, quantity of cement, curing condition.
It was concluded that proportioning strength of precast concrete using normal portland cement or high-early-strength portland cement could be determined with the strength of test specimens cured under the same condition as an actual precast concrete element, except high-strength precast concrete elements and precast concrete elements with large cross sectional dimensions. Proportioning strength of precast concrete using low-heat portland cement could be determined with the strength of test specimens cured under the same condition as an actual precast concrete element, except a high-strength precast concrete column.
