| Title |
Properties of Drying Shrinkage of Concrete with Unit Water and Contents of Shrinkage Reducing Admixtures |
| Authors |
Hwang Yin-Seong ; Han Min-Cheol ; Han Cheon-Goo |
| Keywords |
Unite Water Content ; Shrinkage-Reducing Admixture(SRA) ; Drying Shrinkage ; Length Change |
| Abstract |
In this paper, fundamental and drying shrinkage properties of concrete are investigated varying with water content and shrinkage-reducing admixture (SRA) content to reduce drying shrinkage crack of structure concrete. For target slump and air content variation by unit water content, they are achieved by amending mixture proportioning. For the influence of unit water content on setting time, The reduction of unit water content resulted in retarding setting time due to an increase in superplasticizer dosage. For the influence of SRA dosage on engineering properties, fluidity and air content exhibited a tendency to decrease with an increase in SRA dosage, whereas setting time was accelerated. In 160kg/m3 of unit water content, concrete exhibited highest compressive strength value. However, below or above 160kg/m3 of unit water content, reduction in compressive strength is exhibited due to segregation. SRA dosage resulted in reduction of compressive strength of concrete compared with that of plain concrete.??An increase in unit water content leaded to drying shrinkage of concrete due to an increase in evaporable water. However, the use of SRA exhibited a reduction in drying shrinkag |