CRACK REDUCING METHOD OF MASS CONCRETE FOR MAT FOUNDATION CONSIDERING THE COMBINED ADDITION OF BLAST FURNACE SLAG AND CHEMICAL ADMIXTURE

摘要

A method of reducing crack of foundation mass concrete according to the configuration combination of blast furnace slag and chemical admixture is provided to control the hydration heat crack through the pouring of the mixing concrete mixed with the fly ash and the common portland cement and to reduce the hardening time by rapid strength of the upper concrete. A method of reducing crack of foundation mass concrete according to the configuration combination of blast furnace slag and chemical admixture equally divides the section height of the mass concrete, divides upper and lower layers, pours the common portland cement at the upper layer, mixes a first admixture comprising a delaying AE water reducing agent or a delaying high AE water reducing agent of 0.01~1.5 weight% for the weight of the common portland cement, pours the mixing concrete mixed with the blast furnace slag and the common portland cement of 5~40 weight% for the weight of the common portland cement at the lower layer, and reduces the hydration heating value difference of the upper and lower layers by the combination of the admixture by mixing a second admixture comprising the both water reducing agents of 0.01~1.5 weight% for the weight of the mixing cement.