| Title |
Study on Effect in Properties of Compress Strength and Absorption according to Change to Ultrastructure of Concrete Added Admixture for Watertightness |
| Authors |
Kim Kwang-Ki ; Kweun Mi-Ok ; Lim Nam-Gi ; Jung Sang-Jin |
| Keywords |
Chemical Agent ; Watertightness ; Void ; Heat of Hydration ; Hydrate |
| Abstract |
Among the factors of concrete deterioration, water infiltration accelerates early deterioration caused by the deterioration factors mentioned above. The watertightness of concrete is improved through the use of various binders and expansive admixtures as well as special types of cement designed for high durability.Recently, aiming at high waterproofness and durability, research is being made on waterproof admixtures that can be added before the placement of ready-mixed concrete and increase the waterproofness of the concrete and such waterproof admixtures emphasize the effect of high waterproof performance through improvement in the density of fire pore in concrete. However, because they are added to unhardened concrete, they may affect the physical properties of the concrete and there have been few researches on the characteristics of waterproof admixtures.In order to measure waterproofness in the use of waterproof admixtures, the present study examined resistanceto water infiltration through the addition of admixtures based on basic physical properties, and for this we conducted permeability tests using forced pressure according to the age of specimen and experiment on resistance to water absorption in the open air according to curing condition.According to the results of this study, waterproofness resulting from the addition of waterproof materials was determined by the initial age and it was found that the curing condition of specimens affects resistance to water infiltration. Also, in comparison with specimens without waterproof admixture, specimens containing waterproof admixture showed improvement in water resistance by around 30% in each condition. |