| Title |
Effects of Bacterial Nutrients on Early Cement Composites Properties |
| Authors |
Jang, Indong ; Kim, Baek-Joong ; Yi, Chongku |
| DOI |
https://doi.org/10.5659/JAIK_SC.2018.34.3.53 |
| Keywords |
Bacteria Nutrients ; Setting Time ; Compressive Strength ; Heat of Hydration |
| Abstract |
When manufacturing self-healing concrete using bacteria, nutrients are added to increase the activity of the bacteria. Although many researches have focused on the effects of nutrients containing bacterial healing agent on concrete, few have studied the effects of sole nutrient on self-healing of cement composites. Bacterial nutrients, like commercial chemical admixtures, affect hydration characteristics such as flow, setting, hydration heat, mechanical strength of cement composites and also affect the self healing of cement composites by hydration of unhydrated particles. In this study, effect of the four nutrient commonly used in the existing literature on the hydration characteristics of cement composites by its addition was investigated. Flow, setting time, hydration heat, compressive strength have studied for each nutrients added by 1.5% and 3% of cement weight. Experimental results shows that urea and calcium-nitrate can be used up to 3% without significant detrimental effect on cement composites. Addition of calcium-lactate up to 1.5% show better compressive strength than control, but addition of 3% show almost non-hydration. Yeast extract shows detrimental effects on the composites regardless of the amount added. |